Getty Realty (GTY) 10-K 27 Feb 19 2018 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2018	Feb. 27, 2019	Jun. 30, 2018
Document And Entity Information [Abstract]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2018
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	FY
Trading Symbol	GTY
Entity Registrant Name	GETTY REALTY CORP /MD/
Entity Central Index Key	1,052,752
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	No
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Large Accelerated Filer
Entity Shell Company	false
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Common Stock, Shares Outstanding		40,866,854
Entity Public Float			$ 914,470,000

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Real Estate:
Land	$ 631,185	$ 589,497
Buildings and improvements	409,753	379,785
Construction in progress	2,168	1,682
Total real estate held for use, gross	1,043,106	970,964
Less accumulated depreciation and amortization	(150,691)	(133,353)
Real estate, net	892,415	837,611
Investment in direct financing leases, net	85,892	89,587
Notes and mortgages receivable	33,519	32,366
Cash and cash equivalents	46,892	19,992
Restricted cash	1,850	821
Deferred rent receivable	37,722	33,610
Accounts receivable, net of allowance of $2,094 and $1,840, respectively	3,008	3,712
Prepaid expenses and other assets	57,877	55,055
Total assets	1,159,175	1,072,754
LIABILITIES AND STOCKHOLDERS’ EQUITY:
Borrowings under credit agreement, net	117,227	154,502
Senior unsecured notes, net	324,409	224,656
Environmental remediation obligations	59,821	63,565
Dividends payable	14,495	12,846
Accounts payable and accrued liabilities	62,059	63,490
Total liabilities	578,011	519,059
Commitments and contingencies
Stockholders’ equity:
Preferred stock, $0.01 par value; 20,000,000 and 10,000,000 shares authorized, respectively; unissued
Common stock, $0.01 par value; 100,000,000 and 60,000,000 shares authorized, respectively; 40,854,491 and 39,696,110 shares issued and outstanding, respectively	409	397
Additional paid-in capital	638,178	604,872
Dividends paid in excess of earnings	(57,423)	(51,574)
Total stockholders’ equity	581,164	553,695
Total liabilities and stockholders’ equity	$ 1,159,175	$ 1,072,754

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Statement Of Financial Position [Abstract]
Allowance on accounts receivable	$ 2,094	$ 1,840
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	20,000,000	10,000,000
Preferred stock, shares issued	0	0
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	100,000,000	60,000,000
Common stock, shares issued	40,854,491	39,696,110
Common stock, shares outstanding	40,854,491	39,696,110

Consolidated Statements of Oper

Consolidated Statements of Operations - USD ($) shares in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenues:
Revenues from rental properties	$ 116,328,000	$ 101,332,000	$ 96,711,000
Tenant reimbursements	16,691,000	15,829,000	15,017,000
Interest on notes and mortgages receivable	3,087,000	2,992,000	3,543,000
Total revenues	136,106,000	120,153,000	115,271,000
Operating expenses:
Property costs	23,649,000	22,345,000	23,205,000
Impairments	4,902,000	8,279,000	8,566,000
Environmental	4,711,000	3,098,000	2,654,000
General and administrative	14,661,000	13,879,000	14,155,000
Allowance (recoveries) for uncollectible accounts	470,000	205,000	(448,000)
Depreciation and amortization	23,636,000	19,089,000	19,170,000
Total operating expenses	72,029,000	66,895,000	67,302,000
Gains on dispositions of real estate	3,948,000	1,041,000	6,390,000
Operating income	68,025,000	54,299,000	54,359,000
Other income, net	2,730,000	8,518,000	2,027,000
Interest expense	(22,345,000)	(17,769,000)	(16,561,000)
Earnings from continuing operations	48,410,000	45,048,000	39,825,000
Discontinued operations:
Earnings (loss) from operating activities	(704,000)	2,138,000	(1,236,000)
(Loss) gains on dispositions of real estate			(178,000)
Earnings (loss) from discontinued operations	(704,000)	2,138,000	(1,414,000)
Net earnings	$ 47,706,000	$ 47,186,000	$ 38,411,000
Basic earnings per common share:
Earnings from continuing operations	$ 1.19	$ 1.20	$ 1.16
Earnings (loss) earnings from discontinued operations	(0.02)	0.06	(0.04)
Net earnings	1.17	1.26	1.12
Diluted earnings per common share:
Earnings from continuing operations	1.19	1.20	1.16
Earnings (loss) earnings from discontinued operations	(0.02)	0.06	(0.04)
Net earnings	$ 1.17	$ 1.26	$ 1.12
Weighted average common shares outstanding:
Basic	40,171	36,897	33,806
Diluted	40,191	36,897	33,806

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
CASH FLOWS FROM OPERATING ACTIVITIES:
Net earnings	$ 47,706	$ 47,186	$ 38,411
Adjustments to reconcile net earnings to net cash flow provided by operating activities:
Depreciation and amortization expense	23,636	19,089	19,170
Impairment charges	6,170	9,321	12,814
(Gains) loss on dispositions of real estate
Continuing operations	(3,948)	(1,041)	(6,390)
Discontinued operations			178
Deferred rent receivable	(4,112)	(3,644)	(4,516)
Allowance (recoveries) for uncollectible accounts	470	205	(448)
Amortization of above-market and below-market leases	(808)	(522)	(569)
Amortization of debt issuance costs	871	771	851
Accretion expense	2,409	3,448	4,107
Stock-based compensation expense	1,777	1,350	1,426
Changes in assets and liabilities:
Accounts receivable	(814)	(1,295)	(2,383)
Prepaid expenses and other assets	(708)	489	445
Environmental remediation obligations	(11,210)	(19,798)	(24,640)
Accounts payable and accrued liabilities	1,907	1,183	(1,582)
Net cash flow provided by operating activities	63,346	56,742	36,874
CASH FLOWS FROM INVESTING ACTIVITIES:
Property acquisitions	(77,972)	(214,000)	(7,688)
Capital expenditures	(3,794)	(434)	(298)
Addition to construction in progress	(2,657)	(1,255)	(406)
Proceeds from dispositions of real estate
Continuing operations	3,303	2,739	3,957
Discontinued operations			88
Deposits for property acquisitions	(430)	2,346	(2,206)
Amortization of investment in direct financing leases	3,015	2,511	2,001
(Issuance) of notes and mortgages receivable	(530)
Collection of notes and mortgages receivable	3,134	1,876	17,532
Net cash flow (used in) provided by investing activities	(75,931)	(206,217)	12,980
CASH FLOWS FROM FINANCING ACTIVITIES:
Borrowings under credit agreements	95,000	135,000	8,000
Repayments under credit agreements	(130,000)	(105,000)	(27,000)
Proceeds from senior unsecured notes	100,000	50,000
Payments of capital lease obligations	(468)	(342)	(236)
Repayment of mortgage payable			(400)
Payments of cash dividends	(50,503)	(39,299)	(36,231)
Payments of debt issuance costs	(3,393)	(157)
Security deposits received (refunded)	(260)	247	260
Payments in settlement of restricted stock units		(1,195)	(290)
Net cash flow provided by (used in) financing activities	40,514	157,094	(41,011)
Change in cash, cash equivalents and restricted cash	27,929	7,619	8,843
Cash, cash equivalents and restricted cash at beginning of year	20,813	13,194	4,351
Cash, cash equivalents and restricted cash at end of year	48,742	20,813	13,194
Supplemental disclosures of cash flow information Cash paid during the period for:
Interest	20,790	16,435	15,707
Income taxes	244	(195)	368
Environmental remediation obligations	9,891	12,944	17,633
Non-cash transactions
Dividends declared but not yet paid	14,495	12,846	9,742
Issuance of notes and mortgages receivable related to property dispositions	3,743	1,505	1,814
Equity Offering [Member]
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from issuance of common stock, net		104,312
ATM Program [Member]
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from issuance of common stock, net	$ 30,138	$ 13,528	$ 14,886

Summary of Significant Accounti

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2018
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	NOTE 1. — SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Basis of Presentation The consolidated financial statements include the accounts of Getty Realty Corp. and its wholly-owned subsidiaries. The accompanying consolidated financial statements have been prepared in conformity with accounting principles generally accepted in the United States of America (“GAAP”). We do not distinguish our principal business or our operations on a geographical basis for purposes of measuring performance. We manage and evaluate our operations as a single segment. All significant intercompany accounts and transactions have been eliminated. Use of Estimates, Judgments and Assumptions The consolidated financial statements have been prepared in conformity with GAAP, which requires management to make estimates, judgments and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the consolidated financial statements and revenues and expenses during the period reported. Estimates, judgments and assumptions underlying the accompanying consolidated financial statements include, but are not limited to, real estate, receivables, deferred rent receivable, direct financing leases, depreciation and amortization, impairment of long-lived assets, environmental remediation costs, environmental remediation obligations, litigation, accrued liabilities, income taxes and the allocation of the purchase price of properties acquired to the assets acquired and liabilities assumed. Application of these estimates and assumptions requires exercise of judgment as to future uncertainties and, as a result, actual results could differ materially from these estimates. Reclassifications Certain prior years amounts in the consolidated financial statements have been reclassified to conform to the presentation used in the year ended December 31, 2018. Real Estate Real estate assets are stated at cost less accumulated depreciation and amortization. For acquisitions of real estate which are accounted for as business combinations, we estimate the fair value of acquired tangible assets (consisting of land, buildings and improvements) “as if vacant” and identified intangible assets and liabilities (consisting of leasehold interests, above-market and below-market leases, in-place leases and tenant relationships) and assumed debt. Based on these estimates, we allocate the estimated fair value to the applicable assets and liabilities. Fair value is determined based on an exit price approach, which contemplates the price that would be received from the sale of an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. We expense transaction costs associated with business combinations in the period incurred. Acquisitions of real estate which do not meet the definition of a business are accounted for as asset acquisitions. The accounting model for asset acquisitions is similar to the accounting model for business combinations except that the acquisition costs are capitalized and allocated to the individual assets acquired and liabilities assumed on a relative fair value basis. For additional information regarding property acquisitions, see Note 13 – Property Acquisitions. We capitalize direct costs, including costs such as construction costs and professional services, and indirect costs associated with the development and construction of real estate assets while substantive activities are ongoing to prepare the assets for their intended use. The capitalization period begins when development activities are underway and ends when it is determined that the asset is substantially complete and ready for its intended use. We evaluate the held for sale classification of our real estate as of the end of each quarter. Assets that are classified as held for sale are recorded at the lower of their carrying amount or fair value less costs to sell. When real estate assets are sold or retired, the cost and related accumulated depreciation and amortization is eliminated from the respective accounts and any gain or loss is credited or charged to income. We evaluate real estate sale transactions where we provide seller financing to determine sale and gain recognition in accordance with GAAP. Expenditures for maintenance and repairs are charged to income when incurred. Depreciation and Amortization Depreciation of real estate is computed on the straight-line method based upon the estimated useful lives of the assets, which generally range from 16 to 25 years for buildings and improvements, or the term of the lease if shorter. Asset retirement costs are depreciated over the shorter of the remaining useful lives of USTs or 10 years for asset retirement costs related to environmental remediation obligations, which costs are attributable to the group of assets identified at a property. Leasehold interests and in-place leases are amortized over the remaining term of the underlying lease. Direct Financing Leases Income under direct financing leases is included in revenues from rental properties and is recognized over the lease terms using the effective interest rate method which produces a constant periodic rate of return on the net investments in the leased properties. The investments in direct financing leases are increased for interest income earned and amortized over the life of the leases and reduced by the receipt of lease payments. We consider direct financing leases to be past-due or delinquent when a contractually required payment is not remitted in accordance with the provisions of the underlying agreement. We evaluate each account individually and set up an allowance when, based upon current information and events, it is probable that we will be unable to collect all amounts due according to the existing contractual terms, and the amount can be reasonably estimated. We review our direct financing leases at least annually to determine whether there has been an-other-than-temporary decline in the current estimate of residual value of the property. The residual value is our estimate of what we could realize upon the sale of the property at the end of the lease term, based on market information and third-party estimates where available. If this review indicates that a decline in residual value has occurred that is other-than-temporary, we recognize an impairment charge. There were no impairments of any of our direct financing leases during the years ended December 31, 2018 and 2017. When we enter into a contract to sell properties that are recorded as direct financing leases, we evaluate whether we believe that it is probable that the disposition will occur. If we determine that the disposition is probable and therefore the property’s holding period is reduced, we record an allowance for credit losses to reflect the change in the estimate of the undiscounted future rents. Accordingly, the net investment balance is written down to fair value. Notes and Mortgages Receivable Notes and mortgages receivable consists of loans originated by us in conjunction with property dispositions and funding provided to tenants in conjunction with property acquisitions and capital improvements. Notes and mortgages receivable are recorded at stated principal amounts. We evaluate the collectability of both interest and principal on each loan to determine whether it is impaired. A loan is considered to be impaired when, based upon current information and events, it is probable that we will be unable to collect all amounts due under the existing contractual terms. When a loan is considered to be impaired, the amount of the loss is calculated by comparing the recorded investment to the fair value determined by discounting the expected future cash flows at the loan’s effective interest rate or to the fair value of the underlying collateral, if the loan is collateralized. Interest income on performing loans is accrued as earned. Interest income on impaired loans is recognized on a cash basis. We do not provide for an additional allowance for loan losses based on the grouping of loans, as we believe that the characteristics of the loans are not sufficiently similar to allow an evaluation of these loans as a group for a possible loan loss allowance. As such, all of our loans are evaluated individually for impairment purposes. There were no impairments related to our notes and mortgages receivable during the years ended December 31, 2018 and 2017. Cash and Cash Equivalents We consider all highly liquid investments with a maturity of three months or less when purchased to be cash equivalents. Our cash and cash equivalents are held in the custody of financial institutions, and these balances, at times, may exceed federally insurable limits. Restricted Cash Restricted cash consists of cash that is contractually restricted or held in escrow pursuant to various agreements with counterparties. At December 31, 2018 and 2017, restricted cash of $1,850,000 and $821,000, respectively, consisted of security deposits received from our tenants. Revenue Recognition and Deferred Rent Receivable On January 1, 2018, we adopted ASU 2014-09, Revenue from Contracts with Customers (Topic 606), (“Topic 606”) using the modified retrospective method applying it to any open contracts as of January 1, 2018. The new guidance provides a unified model to determine how revenue is recognized. To determine the proper amount of revenue to be recognized, we perform the following steps: (i) identify the contract with the customer, (ii) identify the performance obligations within the contract, (iii) determine the transaction price, (iv) allocate the transaction price to the performance obligations and (v) recognize revenue when (or as) a performance obligation is satisfied. Our primary source of revenue consists of revenue from rental properties and tenant reimbursements that is derived from leasing arrangements, which is specifically excluded from the standard, and thus had no material impact on our consolidated financial statements or notes to our consolidated financial statements as of December 31, 2018. We concluded that our revenue consists of rental income from leasing arrangements, which is specifically excluded from the standard, and thus had no material impact on our consolidated financial statements or notes to our consolidated financial statements as of December 31, 2018. Minimum lease payments from operating leases are recognized on a straight-line basis over the term of the leases. The cumulative difference between lease revenue recognized under this method and the contractual lease payment terms is recorded as deferred rent receivable on our consolidated balance sheets. We reserve for a portion of the recorded deferred rent receivable if circumstances indicate that a tenant will not make all of its contractual lease payments during the current lease term. We make estimates of the collectability of our accounts receivable related to revenue from rental properties. We analyze accounts receivable and historical bad debt levels, customer creditworthiness and current economic trends when evaluating the adequacy of the allowance for doubtful accounts. Additionally, with respect to tenants in bankruptcy, we estimate the expected recovery through bankruptcy claims and increase the allowance for amounts deemed uncollectible. If our assumptions regarding the collectability of accounts receivable prove incorrect, we could experience write-offs of the accounts receivable or deferred rent receivable in excess of our allowance for doubtful accounts. The present value of the difference between the fair market rent and the contractual rent for above-market and below-market leases at the time properties are acquired is amortized into revenues from rental properties over the remaining terms of the in-place leases. Lease termination fees are recognized as other income when earned upon the termination of a tenant’s lease and relinquishment of space in which we have no further obligation to the tenant. The sales of nonfinancial assets, such as real estate, are to be recognized when control of the asset transfers to the buyer, which will occur when the buyer has the ability to direct the use of or obtain substantially all of the remaining benefits from the asset. This generally occurs when the transaction closes and consideration is exchanged for control of the property. Impairment of Long-Lived Assets Assets are written down to fair value when events and circumstances indicate that the assets might be impaired and the projected undiscounted cash flows estimated to be generated by those assets are less than the carrying amount of those assets. Assets held for disposal are written down to fair value less estimated disposition costs. We recorded impairment charges aggregating $6,170,000, $9,321,000 and $12,814,000 for the years ended December 31, 2018, 2017 and 2016, respectively, in continuing and discontinued operations. Our estimated fair values, as they relate to property carrying values were primarily based upon (i) estimated sales prices from third-party offers based on signed contracts, letters of intent or indicative bids, for which we do not have access to the unobservable inputs used to determine these estimated fair values, and/or consideration of the amount that currently would be required to replace the asset, as adjusted for obsolescence (this method was used to determine $2,553,000 of the $6,170,000 in impairments recognized during the year ended December 31, 2018) and (ii) discounted cash flow models (this method was used to determine $175,000 of the $6,170,000 in impairments recognized during the year ended December 31, 2018). During the year ended December 31, 2018, we recorded $3,442,000 of the $6,170,000 in impairments recognized due to the accumulation of asset retirement costs as a result of changes in estimates associated with our estimated environmental liabilities which increased the carrying values of certain properties in excess of their fair values. The estimated fair value of real estate is based on the price that would be received from the sale of the property in an orderly transaction between market participants at the measurement date. In general, we consider multiple internal valuation techniques when measuring the fair value of a property, all of which are based on unobservable inputs and assumptions that are classified within Level 3 of the Fair Value Hierarchy. These unobservable inputs include assumed holding periods ranging up to 15 years, assumed average rent increases of 2.0% annually, income capitalized at a rate of 8.0% and cash flows discounted at a rate of 7.0%. These assessments have a direct impact on our net income because recording an impairment loss results in an immediate negative adjustment to net income. The evaluation of anticipated cash flows is highly subjective and is based in part on assumptions regarding future rental rates and operating expenses that could differ materially from actual results in future periods. Where properties held for use have been identified as having a potential for sale, additional judgments are required related to the determination as to the appropriate period over which the projected undiscounted cash flows should include the operating cash flows and the amount included as the estimated residual value. This requires significant judgment. In some cases, the results of whether impairment is indicated are sensitive to changes in assumptions input into the estimates, including the holding period until expected sale. Deferred Gain On August 3, 2015, we terminated our unitary triple-net lease with Hanuman Business, Inc. (d/b/a “Ramoco”) and sold to Ramoco affiliates 48 of the 61 properties that had been subject to the lease. The total consideration for the 48 properties we sold to Ramoco affiliates, including a seller financing mortgage of $13,900,000, was $15,000,000. In accordance with ASC 360-20, Property, Plant and Equipment - Real Estate Sales, we evaluated the accounting for the gain on sales of these assets, noting that the buyer’s initial investment did not represent the amount required for recognition of the gain by the full accrual method. Accordingly, we recorded a deferred gain of $3,900,000 related to the Ramoco sale. The deferred gain was recorded in accounts payable and accrued liabilities on our balance sheet at December 31, 2015. On April 28, 2016, Ramoco affiliates repaid the entire seller financing mortgage and, as a result, the deferred gain was recognized in our consolidated statements of operations for the year ended December 31, 2016. Fair Value of Financial Instruments All of our financial instruments are reflected in the accompanying consolidated balance sheets at amounts which, in our estimation based upon an interpretation of available market information and valuation methodologies, reasonably approximate their fair values, except those separately disclosed in the notes below. The preparation of consolidated financial statements in accordance with GAAP requires management to make estimates of fair value that affect the reported amounts of assets and liabilities and disclosure of assets and liabilities at the date of the consolidated financial statements and revenues and expenses during the period reported using a hierarchy (the “Fair Value Hierarchy”) that prioritizes the inputs to valuation techniques used to measure the fair value. The Fair Value Hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1 measurements) and the lowest priority to unobservable inputs (Level 3 measurements). The levels of the Fair Value Hierarchy are as follows: “Level 1” – inputs that reflect unadjusted quoted prices in active markets for identical assets or liabilities that we have the ability to access at the measurement date; “Level 2” – inputs other than quoted prices that are observable for the asset or liability either directly or indirectly, including inputs in markets that are not considered to be active; and “Level 3” – inputs that are unobservable. Certain types of assets and liabilities are recorded at fair value either on a recurring or non-recurring basis. Assets required or elected to be marked-to-market and reported at fair value every reporting period are valued on a recurring basis. Other assets not required to be recorded at fair value every period may be recorded at fair value if a specific provision or other impairment is recorded within the period to mark the carrying value of the asset to market as of the reporting date. Such assets are valued on a non-recurring basis. Environmental Remediation Obligations We record the fair value of a liability for an environmental remediation obligation as an asset and liability when there is a legal obligation associated with the retirement of a tangible long-lived asset and the liability can be reasonably estimated. Environmental remediation obligations are estimated based on the level and impact of contamination at each property. The accrued liability is the aggregate of our estimate of the fair value of cost for each component of the liability. The accrued liability is net of estimated recoveries from state UST remediation funds considering estimated recovery rates developed from prior experience with the funds. Net environmental liabilities are currently measured based on their expected future cash flows which have been adjusted for inflation and discounted to present value. We accrue for environmental liabilities that we believe are allocable to other potentially responsible parties if it becomes probable that the other parties will not pay their environmental remediation obligations. Litigation Legal fees related to litigation are expensed as legal services are performed. We provide for litigation accruals, including certain litigation related to environmental matters, when it is probable that a liability has been incurred and a reasonable estimate of the liability can be made. If the estimate of the liability can only be identified as a range, and no amount within the range is a better estimate than any other amount, the minimum of the range is accrued for the liability. We accrue our share of environmental litigation liabilities based on our assumptions of the ultimate allocation method and share that will be used when determining our share of responsibility. Income Taxes We and our subsidiaries file a consolidated federal income tax return. Effective January 1, 2001, we elected to qualify, and believe that we are operating so as to qualify, as a REIT for federal income tax purposes. Accordingly, we generally will not be subject to federal income tax on qualifying REIT income, provided that distributions to our stockholders equal at least the amount of our taxable income as defined under the Internal Revenue Code. We accrue for uncertain tax matters when appropriate. The accrual for uncertain tax positions is adjusted as circumstances change and as the uncertainties become more clearly defined, such as when audits are settled or exposures expire. Tax returns for the years 2015, 2016 and 2017, and tax returns which will be filed for the year ended 2018, remain open to examination by federal and state tax jurisdictions under the respective statutes of limitations. New Accounting Pronouncements In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842) We elected the package of practical expedients and the lease and non-lease component practical expedient. We have elected to apply the transition requirements at the January 1, 2019, effective date rather than at the beginning of the earliest comparative period presented We expect to recognize operating lease liabilities and right of use assets of $22,000,000 to $32,000,000, which will be presented separately on our consolidated financial statements for the quarter ending March 31, 2019 . The lease liability and right-of-use asset are to be carried at the present value of remaining expected future lease payments. On June 16, 2016, the FASB issued ASU 2016-13, Financial Instruments – Credit Losses (Topic 326): Measurements of Credit Losses on Financial Instruments In August 2016, the FASB issued ASU 2016-15, Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments Effective January 1, 2018, we adopted ASU 2016-15. The adoption of this guidance did not have an impact on our consolidated financial statements or notes to our consolidated financial statements. On February 22, 2017, the FASB issued ASU 2017-05, Other Income – Gains and Losses from the Derecognition of Nonfinancial Assets (Subtopic 610-20), Clarifying the Scope of Asset Derecognition Guidance and Accounting for Partial Sales of Nonfinancial Assets Effective January 1, 2018, we adopted ASU 2017-05 on a modified retrospective basis. Upon adoption, we apply the guidance to prospective disposals of nonfinancial assets within the scope of Subtopic 610-20. The adoption of this guidance did not have an impact on our consolidated financial statements or notes to our consolidated financial statements. In August 2018, the Securities and Exchange Commission (“SEC”) adopted amendments to update and simplify disclosure requirements as well as eliminate outdated, superseded and/or redundant requirements with GAAP. The amendments are effective for all SEC filings made on or after November 5, 2018. The amendments removed certain SEC guidance that conflicted with GAAP guidance, under which we previously followed SEC guidance and recorded Gain/(loss) on dispositions of real estate, after Operating income. We have reclassified Gain/(loss) on dispositions of real estate within Operating income, per GAAP for all periods presented.

Leases

Leases	12 Months Ended
	Dec. 31, 2018
Leases [Abstract]
Leases	NOTE 2. — LEASES As of December 31, 2018, we owned 859 properties and leased 74 properties from third-party landlords. These 933 properties are located in 30 states across the United States and Washington, D.C. Substantially all of our properties are leased on a triple-net basis primarily to petroleum distributors, convenience store retailers and, to a lesser extent, individual operators. Generally, our tenants supply fuel and either operate our properties directly or sublet our properties to operators who operate their convenience stores, gasoline stations, automotive repair service facilities or other businesses at our properties. Our triple-net lease tenants are responsible for the payment of all taxes, maintenance, repairs, insurance and other operating expenses relating to our properties, and are also responsible for environmental contamination occurring during the terms of their leases and in certain cases also for environmental contamination that existed before their leases commenced. For additional information regarding environmental obligations, see Note 5 – Environmental Obligations. Substantially all of our tenants’ financial results depend on the sale of refined petroleum products, convenience store sales or rental income from their subtenants. As a result, our tenants’ financial results are highly dependent on the performance of the petroleum marketing industry, which is highly competitive and subject to volatility. During the terms of our leases, we monitor the credit quality of our triple-net tenants by reviewing their published credit rating, if available, reviewing publicly available financial statements, or reviewing financial or other operating statements which are delivered to us pursuant to applicable lease agreements, monitoring news reports regarding our tenants and their respective businesses, and monitoring the timeliness of lease payments and the performance of other financial covenants under their leases. Revenues from rental properties for the years ended December 31, 2018, 2017 and 2016, were $116,328,000, $101,332,000 and $96,711,000, respectively. Rental income contractually due from our tenants included in revenues from rental properties was $114,105,000, $99,355,000 and $93,294,000 for the years ended December 31, 2018, 2017 and 2016, respectively. In accordance with GAAP, we recognize rental revenue in amounts which vary from the amount of rent contractually due during the periods presented. As a result, revenues from rental properties include non-cash adjustments recorded for deferred rental revenue due to the recognition of rental income on a straight-line basis over the current lease term, the net amortization of above-market and below-market leases, rental income recorded under direct financing leases using the effective interest method which produces a constant periodic rate of return on the net investments in the leased properties and the amortization of deferred lease incentives (the “Revenue Recognition Adjustments”). Revenue Recognition Adjustments included in revenues from rental properties were $2,223,000, $1,976,000 and $3,417,000 for the years ended December 2018, 2017 and 2016, respectively. We reserve for a portion of the recorded deferred rent receivable if circumstances indicate that a tenant will not make all of its contractual lease payments during the current lease term. Our assessments and assumptions regarding the recoverability of the deferred rent receivable are reviewed on an ongoing basis and such assessments and assumptions are subject to change. There were no deferred rent receivable reserves at December 31, 2018 and 2017, respectively. Tenant reimbursements, which consist of real estate taxes and other municipal charges paid by us which were reimbursable by our tenants pursuant to the terms of triple-net lease agreements, were $16,691,000, $15,829,000 and $15,017,000 for the years ended December 31, 2018, 2017 and 2016, respectively. We incurred $579,000, $126,000 and $148,000 of lease origination costs for the years ended December 31, 2018, 2017 and 2016, respectively. This deferred expense is recognized on a straight-line basis as amortization expense in our consolidated statements of operations over the terms of the various leases. The components of the $85,892,000 investment in direct financing leases as of December 31, 2018, are minimum lease payments receivable of $139,276,000 plus unguaranteed estimated residual value of $13,928,000 less unearned income of $67,312,000. The components of the $89,587,000 investment in direct financing leases as of December 31, 2017, are minimum lease payments receivable of $154,441,000 plus unguaranteed estimated residual value of $13,979,000 less unearned income of $78,833,000. Future contractual minimum annual rentals receivable from our tenants, which have terms in excess of one year as of December 31, 2018, are as follows (in thousands): Year Ending December 31, Operating Leases Direct Financing Leases Total 2019 $ 102,928 $ 12,864 $ 115,792 2020 102,693 13,156 115,849 2021 99,593 13,339 112,932 2022 99,184 13,420 112,604 2023 99,223 13,467 112,690 Thereafter $ 678,106 $ 73,030 $ 751,136 We have obligations to lessors under non-cancelable operating leases which have terms in excess of one year, principally for convenience store and gasoline station properties. The leased properties have a remaining lease term averaging approximately nine years, including renewal options. Future minimum annual rentals payable under such leases, excluding renewal options, are as follows: 2019 – $6,016,000, 2020 – $5,284,000, 2021 – $4,371,000, 2022 – $2,766,000, 2023 – $2,021,000 and $2,754,000 thereafter. Rent expense, substantially all of which consists of minimum rentals on non-cancelable operating leases, amounted to $4,660,000, $5,091,000 and $5,376,000 for the years ended December 31, 2018, 2017 and 2016, respectively, and is included in property costs using the straight-line method. Rent received under subleases for the years ended December 31, 2018, 2017 and 2016, was $9,023,000, $9,296,000 and $9,153,000, respectively, and is included in rental revenue discussed above. Major Tenants As of December 31, 2018, we had three significant tenants by revenue: • We leased 157 convenience store and gasoline station properties in three separate unitary leases and three stand-alone leases to subsidiaries of Global Partners LP (NYSE: GLP) (“Global”). In the aggregate, our leases with subsidiaries of Global represented 17% and 21% of our total revenues for the years ended December 31, 2018 and 2017, respectively. All of our unitary leases with subsidiaries of Global are guaranteed by the parent company. • We leased 77 convenience store and gasoline station properties pursuant to three separate unitary leases to Apro, LLC (d/b/a “United Oil”). In the aggregate, our leases with United Oil represented 13% and 15% of our total revenues for the years ended December 31, 2018 and 2017, respectively. • We leased 76 convenience store and gasoline station properties pursuant to two separate unitary leases to subsidiaries of Chestnut Petroleum Dist., Inc. (“Chestnut”). In the aggregate, our leases with subsidiaries of Chestnut represented 11% and 13% of our total revenues for the years ended December 31, 2018 and 2017, respectively. The largest of these unitary leases, covering 57 of our properties, is guaranteed by the parent company, its principals and numerous Chestnut affiliates. Getty Petroleum Marketing Inc. Getty Petroleum Marketing Inc. (“Marketing”) was our largest tenant from 1997 until 2012, leasing substantially all of our properties acquired or leased prior to 1997 under a master lease. Our master lease with Marketing was terminated in April 2012, as a consequence of Marketing’s bankruptcy, at which time we either sold or released these properties. As of December 31, 2018, 374 of the properties we own or lease were previously leased to Marketing, of which 331 properties are subject to long-term triple-net leases with petroleum distributors in 14 separate property portfolios and 30 properties are leased as single unit triple-net leases. The leases covering properties previously leased to Marketing are unitary triple-net lease agreements generally with an initial term of 15 years and options for successive renewal terms of up to 20 years. Rent is scheduled to increase at varying intervals during both the initial and renewal terms of our leases. Several of the leases provide for additional rent based on the aggregate volume of fuel sold. In addition, the majority of the leases require the tenants to invest capital in our properties, substantially all of which are related to the replacement of USTs that are owned by our tenants. As of December 31, 2018, we have a remaining commitment to fund up to $7,621,000 in the aggregate with our tenants for our portion of such capital improvements. Our commitment provides us with the option to either reimburse our tenants or to offset rent when these capital expenditures are made. This deferred expense is recognized on a straight-line basis as a reduction of rental revenue in our consolidated statements of operations over the life of the various leases. As part of the triple-net leases for properties previously leased to Marketing, we transferred title of the USTs to our tenants, and the obligation to pay for the retirement and decommissioning or removal of USTs at the end of their useful lives, or earlier if circumstances warranted, was fully or partially transferred to our new tenants. We remain contingently liable for this obligation in the event that our tenants do not satisfy their responsibilities. Accordingly, through December 31, 2018, we removed $13,813,000 of asset retirement obligations and $10,808,000 of net asset retirement costs related to USTs from our balance sheet. The cumulative change of $1,754,000 (net of accumulated amortization of $1,251,000) is recorded as deferred rental revenue and will be recognized on a straight-line basis as additional revenues from rental properties over the terms of the various leases.

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2018
Commitments And Contingencies Disclosure [Abstract]
Commitments and Contingencies	NOTE 3. — COMMITMENTS AND CONTINGENCIES Credit Risk In order to minimize our exposure to credit risk associated with financial instruments, we place our temporary cash investments, if any, with high credit quality institutions. Temporary cash investments, if any, are currently held in an overnight bank time deposit with JPMorgan Chase Bank, N.A. and these balances, at times, may exceed federally insurable limits. Legal Proceedings We are subject to various legal proceedings and claims which arise in the ordinary course of our business. As of December 31, 2018 and 2017, we had accrued $12,231,000 and $12,311,000, respectively, for certain of these matters which we believe were appropriate based on information then currently available. We have recorded credits aggregating $45,000 for the year ended December 31, 2018, and provisions aggregating $1,044,000, for environmental litigation accruals for the year ended December 31, 2017, for certain of these matters. We are unable to estimate ranges in excess of the amount accrued with any certainty for these matters. It is possible that our assumptions regarding the ultimate allocation method and share of responsibility that we used to allocate environmental liabilities may change, which may result in our providing an accrual, or adjustments to the amounts recorded, for environmental litigation accruals. Matters related to our former Newark, New Jersey Terminal and the Lower Passaic River, our methyl tertiary butyl ether (a fuel derived from methanol, commonly referred to as “MTBE”) litigations in the states of New Jersey, Pennsylvania and Maryland, and our lawsuit with the State of New York pertaining to a property formerly owned by us in Uniondale, New York, in particular, could cause a material adverse effect on our business, financial condition, results of operations, liquidity, ability to pay dividends or stock price. During the years ended December 31, 2018 and 2017, we received $147,000 and $6,381,000, respectively, for former legal litigation settlements. Matters related to our former Newark, New Jersey Terminal and the Lower Passaic River In September 2003, we received a directive (the “Directive”) issued by the New Jersey Department of Environmental Protection (“NJDEP”) under the New Jersey Spill Compensation and Control Act. The Directive indicated that we are one of approximately 66 potentially responsible parties for alleged natural resource damages resulting from the discharges of hazardous substances along the Lower Passaic River (the “Lower Passaic River”). The Directive provides, among other things, that the named recipients must conduct an assessment of the natural resources that have been injured by discharges into the Lower Passaic River and must implement interim compensatory restoration for the injured natural resources. The NJDEP alleges that our liability arises from alleged discharges originating from our former Newark, New Jersey Terminal site (which was sold in October 2013). We responded to the Directive by asserting that we are not liable. There has been no material activity and/or communications by the NJDEP with respect to the Directive since early after its issuance. In May 2007, the United States Environmental Protection Agency (“EPA”) entered into an Administrative Settlement Agreement and Order on Consent (“AOC”) with over 70 parties to perform a Remedial Investigation and Feasibility Study (“RI/FS”) for a 17-mile stretch of the Lower Passaic River in New Jersey. The RI/FS is intended to address the investigation and evaluation of alternative remedial actions with respect to alleged damages to the Lower Passaic River. Most of the parties to the AOC, including us, are also members of a Cooperating Parties Group (“CPG”). The CPG agreed to an interim allocation formula for purposes of allocating the costs to complete the RI/FS among its members, with the understanding that this agreed-upon allocation formula is not binding on the parties in terms of any potential liability for the costs to remediate the Lower Passaic River. The CPG submitted to the EPA its draft RI/FS in 2015. The draft RI/FS set forth various alternatives for remediating the entire 17-mile stretch of the Lower Passaic River, and provides that the cost estimate for the preferred remedial action presented therein is in the range of approximately $483,000,000 to $725,000,000. The EPA has provided comments to the draft RI/FS, which led to discussions between the CPG and the EPA regarding an alternative approach to completing the RI/FS, including various adaptive management scenarios focusing on source control interim remedies for the upper 9-miles of the Lower Passaic River. These discussions between the CPG and the EPA are ongoing. In addition to the RI/FS activities, other actions relating to the investigation and/or remediation of the Lower Passaic River have proceeded as follows. First, in June 2012, certain members of the CPG entered into an Administrative Settlement Agreement and Order on Consent (“10.9 AOC”) effective June 18, 2012, to perform certain remediation activities, including removal and capping of sediments at the river mile 10.9 area and certain testing. The EPA also issued a Unilateral Order to Occidental Chemical Corporation (“Occidental”) directing Occidental to participate and contribute to the cost of the river mile 10.9 work. Concurrent with the CPG’s work on the RI/FS, on April 11, 2014, the EPA issued a draft Focused Feasibility Study (“FFS”) with proposed remedial alternatives to remediate the lower 8-miles of the 17-mile stretch of the Lower Passaic River. The FFS was subject to public comments and objections, and on March 4, 2016, the EPA issued its Record of Decision (“ROD”) for the lower 8-miles selecting a remedy that involves bank-to-bank dredging and installing an engineered cap with an estimated cost of $1,380,000,000. On March 31, 2016, we and more than 100 other potentially responsible parties received from the EPA a “Notice of Potential Liability and Commencement of Negotiations for Remedial Design” (“Notice”), which informed the recipients that the EPA intends to seek an Administrative Order on Consent and Settlement Agreement with Occidental for remedial design of the remedy selected in the ROD, after which the EPA plans to begin negotiations with “major” potentially responsible parties for implementation and/or payment of the selected remedy. The Notice also stated that the EPA believes that some of the potentially responsible parties and other parties not yet identified as potentially responsible parties will be eligible for a cash out settlement with the EPA. On October 5, 2016, the EPA announced that it had entered into a settlement agreement with Occidental which requires that Occidental perform the remedial design (which is expected to take four years to complete) for the remedy selected for the lower 8-miles of the Lower Passaic River. On June 16, 2016, Maxus Energy Corporation and Tierra Solutions, Inc., who have contractual liability to Occidental for Occidental’s potential liability related to the Lower Passaic River, filed for reorganization under Chapter 11 of the U.S. Bankruptcy Code. In the Chapter 11 proceedings, YPF SA, Maxus and Tierra’s corporate parent, sought bankruptcy approval of a settlement under which YPF would pay $130,000,000 to the bankruptcy estate in exchange for a release in favor of Maxus, Tierra, YPF and YPF’s affiliates of Maxus and Tierra’s contractual environmental liability to Occidental. We and the CPG filed proofs of claims for costs incurred by the CPG relating to the Lower Passaic River. On April 19, 2017, Maxus, Tierra and certain of its affiliates (collectively, the “Debtors”), together with the Official Committee of Unsecured Creditors, of which the CPG is a member, filed an Amended Chapter 11 Plan of Liquidation (the “Chapter 11 Plan”) in the Chapter 11 proceedings, which has been confirmed by order of the bankruptcy court, having an effective date of July 14, 2017 (the “Effective Date”). The Chapter 11 Plan provides for, among other things, the creation of a Liquidating Trust to liquidate and distribute from available assets certain allowed claims pursuant to the procedures set forth therein. Under the terms of the Chapter 11 Plan, the CPG’s proof of claim, which includes past costs incurred in the performance of the RI/FS and River Mile 10.9 work, is classified as an Allowed Class 4 Claim in the approximate amount of $14,300,000. To the extent that the CPG receives any distributions from the Liquidating Trust with respect to its Allowed Class 4 Claim, we would be entitled to seek reimbursement of our pro-rata share of said distribution for past costs we incurred with respect to performance of the RI/FS and River Mile 10.9 work. The Chapter 11 Plan also provides for a Mutual Contribution Release Agreement under which claims for contribution relating to liabilities associated with the Lower Passaic River and incurred prior to the Effective Date are mutually released by and among the parties identified therein. We are one of 59 parties (the “Released Parties”) that entered into the Mutual Contribution Release Agreement, pursuant to which (i) the Debtors release the Released Parties from any contribution claim they may have, (ii) Occidental releases the Released Parties for the amounts itemized in Occidental’s Class 4 Claim, and (iii) the Released Parties release the Debtors and Occidental for the amounts itemized in the CPG’s Class 4 Claim. The Mutual Contribution Release Agreement does not reduce or affect the CPG’s right to receive distributions from the Liquidating Trust on account of the CPG’s Class 4 Claim or our pro-rata share of any such distributions, nor does it affect our right to assert any future claims against Occidental for costs that we may incur related to the remediation of the Lower Passaic River after the Effective Date. By letter dated March 30, 2017, the EPA advised the recipients of the Notice that it would be entering into cash out settlements with 20 potentially responsible parties to resolve their alleged liability for the lower 8-mile remedial action that is the subject of the ROD. The letter also stated that the EPA would begin a process for identifying other potentially responsible parties for negotiation of cash out settlements to resolve their alleged liability for the lower 8-mile remedial action that is the subject of the ROD. We were not included in the initial group of 20 parties identified by the EPA for cash out settlements. In January 2018, the EPA published a notice of its intent to enter into a final settlement agreement with 15 of the identified 20 parties to resolve their respective alleged liability for the ROD work, each for a payment to the EPA in the amount of $280,600. The EPA has also been engaged in discussions, in which we are participating, with the remaining recipients of the Notice regarding a proposed framework for an allocation process that will lead to offers of cash-out settlements to certain additional parties and a consent decree in which parties that are not offered a cash-out settlement will agree to perform the lower 8-mile remedial action. The EPA-commenced allocation process was scheduled to conclude by mid-2019, but is likely to be extended. On June 30, 2018, Occidental filed a complaint in the United States District Court for the District of New Jersey seeking cost recovery and contribution under the Comprehensive Environmental Response, Compensation, and Liability Act (“CERCLA”) for its alleged expenses with respect to the investigation, design, and anticipated implementation of the remedy for the lower 8-miles of the Passaic River. The complaint lists over 120 defendants, including us, many of which were also named in the NJDEP’s 2003 Directive and the EPA’s 2016 Notice. We do not know whether this new complaint will impact the EPA’s allocation process or the ultimate outcome of the matter. We intend to defend the claims consistent with our defenses in the related proceedings. Many uncertainties remain regarding how the EPA intends to implement the ROD. We anticipate that performance of the EPA’s selected remedy will be subject to future negotiations, potential enforcement proceedings and/or possible litigation. The RI/FS, AOC, 10.9 AOC and Notice do not obligate us to fund or perform remedial action contemplated by either the ROD or RI/FS and do not resolve liability issues for remedial work or the restoration of or compensation for alleged natural resource damages to the Lower Passaic River, which are not known at this time. Our ultimate liability, if any, in the pending and possible future proceedings pertaining to the Lower Passaic River is uncertain and subject to numerous contingencies which cannot be predicted and the outcome of which are not yet known. MTBE Litigation – State of New Jersey We are defending against a lawsuit brought by various governmental agencies of the State of New Jersey, including the NJDEP alleging various theories of liability due to contamination of groundwater with MTBE involving multiple locations throughout the State of New Jersey (the “New Jersey MDL Proceedings”). The complaint names as defendants approximately 50 petroleum refiners, manufacturers, distributors and retailers of MTBE or gasoline containing MTBE. The State of New Jersey is seeking reimbursement of significant clean-up and remediation costs arising out of the alleged release of MTBE containing gasoline in the State of New Jersey and is asserting various natural resource damage claims as well as liability against the owners and operators of gasoline station properties from which the releases occurred. The majority of the named defendants have already settled their cases with the State of New Jersey. MTBE Litigation – State of Pennsylvania On July 7, 2014, our subsidiary, Getty Properties Corp., was served with a complaint filed by the Commonwealth of Pennsylvania (the “State”) in the Court of Common Pleas, Philadelphia County relating to alleged statewide MTBE contamination in Pennsylvania. The complaint names us and more than 50 other defendants, including petroleum refiners, manufacturers, distributors and retailers of MTBE or gasoline containing MTBE. The complaint seeks compensation for natural resource damages and for injuries sustained as a result of “defendants’ unfair and deceptive trade practices and acts in the marketing of MTBE and gasoline containing MTBE.” The plaintiffs also seek to recover costs paid or incurred by the State to detect, treat and remediate MTBE from public and private water wells and groundwater. The plaintiffs assert causes of action against all defendants based on multiple theories, including strict liability – defective design; strict liability – failure to warn; public nuisance; negligence; trespass; and violation of consumer protection law. The case was filed in the Court of Common Pleas, Philadelphia County, but was removed by defendants to the United States District Court for the Eastern District of Pennsylvania and then transferred to the United States District Court for the Southern District of New York so that it may be managed as part of the ongoing MTBE MDL proceedings. In November 2015, plaintiffs filed a second amended complaint naming additional defendants and adding factual allegations intended to bolster their claims against the defendants. We have joined with other defendants in the filing of a motion to dismiss the claims against us. This motion is pending with the Court. We intend to defend vigorously the claims made against us. Our ultimate liability, if any, in this proceeding is uncertain and subject to numerous contingencies which cannot be predicted and the outcome of which are not yet known. MTBE Litigation – State of Maryland On December 17, 2017, the State of Maryland, by and through the Attorney General on behalf of the Maryland Department of Environment and the Maryland Department of Health (the “State of Maryland”), filed a complaint in the Circuit Court for Baltimore City related to alleged statewide MTBE contamination in Maryland. The complaint was served upon us on January 19, 2018. The complaint names us and more than 60 other defendants, including petroleum refiners, manufacturers, distributors and retailers of MTBE or gasoline containing MTBE. The complaint seeks compensation for natural resource damages and for injuries sustained as a result of the defendants’ unfair and deceptive trade practices in the marketing of MTBE and gasoline containing MTBE. The plaintiffs also seek to recover costs paid or incurred by the State of Maryland to detect, investigate, treat and remediate MTBE from public and private water wells and groundwater, punitive damages and the award of attorneys’ fees and litigation costs. The plaintiffs assert causes of action against all defendants based on multiple theories, including strict liability – defective design; strict liability – failure to warn; strict liability for abnormally dangerous activity; public nuisance; negligence; trespass; and violations of Titles 4, 7 and 9 of the Maryland Environmental Code. On February 14, 2018, defendants removed the case to the United States District Court for the District of Maryland. It is unclear whether the matter will ultimately be removed to the MTBE MDL proceedings or remain in federal court in Maryland. We intend to defend vigorously the claims made against us. Our ultimate liability, if any, in this proceeding is uncertain and subject to numerous contingencies which cannot be predicted and the outcome of which are not yet known. Uniondale, New York Litigation In September 2004, the State of New York commenced an action against us, United Gas Corp., Costa Gas Station, Inc., Vincent Costa, The Ingraham Bedell Corporation, Richard Berger and Exxon Mobil Corporation in New York Supreme Court in Albany County seeking recovery for reimbursement of investigation and remediation costs claimed to have been incurred by the New York Environmental Protection and Spill Compensation Fund relating to contamination it alleges emanated from various gasoline station properties located in the same vicinity in Uniondale, New York, including a site formerly owned by us and at which a petroleum release and cleanup occurred. The complaint also seeks future costs for remediation, as well as interest and penalties. We have served an answer to the complaint denying responsibility. In 2007, the State of New York commenced action against Shell Oil Company, Shell Oil Products Company, Motiva Enterprises, LLC, and related parties, in the New York Supreme Court, Albany County seeking basically the same relief sought in the action involving us. We have also filed a third-party complaint against Hess Corporation, Sprague Operating Resources LLC (successor to RAD Energy Corp.), Service Station Installation of NY, Inc., and certain individual defendants based on alleged contribution to the contamination that is the subject of the State’s claims arising from a petroleum discharge at a gasoline station up-gradient from the site formerly owned by us. In 2016, the various actions filed by the State of New York and our third-party actions were consolidated for discovery proceedings and trial. Discovery in this case is in later stages and, as it nears completion, a schedule for trial will be established. We are unable to estimate the range of loss in excess of the amount we have accrued for this lawsuit. It is possible that losses related to this case, in excess of the amounts accrued, as of December 31, 2018, could cause a material adverse effect on our business, financial condition, results of operations, liquidity, ability to pay dividends or stock price.

Debt

Debt	12 Months Ended
	Dec. 31, 2018
Debt Disclosure [Abstract]
Debt	NOTE 4. — DEBT The amounts outstanding under our Restated Credit Agreement, Third Restated Prudential Note Purchase Agreement and MetLife Note Purchase Agreement (as defined below) are as follows (in thousands): Maturity Date Interest Rate December 31, 2018 December 31, 2017 Unsecured Revolving Credit Facility March 2022 3.95 % $ 70,000 $ 105,000 Unsecured Term Loan March 2023 3.96 % 50,000 50,000 Series A Notes February 2021 6.00 % 100,000 100,000 Series B Notes June 2023 5.35 % 75,000 75,000 Series C Notes February 2025 4.75 % 50,000 50,000 Series D Notes June 2028 5.47 % 50,000 — Series E Notes June 2028 5.47 % 50,000 — Total debt 445,000 380,000 Unamortized debt issuance costs, net (3,364 ) (842 ) Total debt, net $ 441,636 $ 379,158 Credit Agreement On June 2, 2015, we entered into a $225,000,000 senior unsecured credit agreement (the “Credit Agreement”) with a group of banks led by Bank of America, N.A. (the “Bank Syndicate”). The Credit Agreement consisted of a $175,000,000 unsecured revolving credit facility (the “Revolving Facility”) and a $50,000,000 unsecured term loan (the “Term Loan”). On March 23, 2018, we entered into an amended and restated credit agreement (as amended, as described below, the “Restated Credit Agreement”) amending and restating our Credit Agreement. Pursuant to the Restated Credit Agreement, we (a) increased the borrowing capacity under the Revolving Facility from $175,000,000 to $250,000,000, (b) extended the maturity date of the Revolving Facility from June 2018 to March 2022, (c) extended the maturity date of the Term Loan from June 2020 to March 2023 and (d) amended certain financial covenants and provisions. Subject to the terms of the Restated Credit Agreement and our continued compliance with its provisions, we have the option to (a) extend the term of the Revolving Facility for one additional year to March 2023 and (b) request that the lenders approve an increase of up to $300,000,000 in the amount of the Revolving Facility and/or the Term Loan to $600,000,000 in the aggregate. The Restated Credit Agreement incurs interest and fees at various rates based on our total indebtedness to total asset value ratio at the end of each quarterly reporting period. The Revolving Facility permits borrowings at an interest rate equal to the sum of a base rate plus a margin of 0.50% to 1.30% or a LIBOR rate plus a margin of 1.50% to 2.30%. The annual commitment fee on the undrawn funds under the Revolving Facility is 0.15% to 0.25%. The Term Loan bears interest at a rate equal to the sum of a base rate plus a margin of 0.45% to 1.25% or a LIBOR rate plus a margin of 1.45% to 2.25%. The Term Loan does not provide for scheduled reductions in the principal balance prior to its maturity. On September 19, 2018, we entered into an amendment (the “Amendment”) of our Restated Credit Agreement. The Amendment modifies the Restated Credit Agreement to, among other things: (i) reflect that we had previously entered into (a) an amended and restated note purchase and guarantee agreement with The Prudential Insurance Company of America (“Prudential”) and certain of its affiliates and (b) a note purchase and guarantee agreement with the Metropolitan Life Insurance Company (“MetLife”) and certain of its affiliates; and (ii) permit borrowings under each of the Revolving Facility and the Term Loan at three different interest rates, including a rate based on the LIBOR Daily Floating Rate (as defined in the Amendment) plus the Applicable Rate (as defined in the Amendment) for such facility. Senior Unsecured Notes On June 21, 2018, we entered into a third amended and restated note purchase and guarantee agreement (the “Third Restated Prudential Note Purchase Agreement”) amending and restating our existing senior note purchase agreement with Prudential and certain of its affiliates. Pursuant to the Third Restated Prudential Note Purchase Agreement, we agreed that our (a) 6.0% Series A Guaranteed Senior Notes due February 25, 2021, in the original aggregate principal amount of $100,000,000 (the “Series A Notes”), (b) 5.35% Series B Guaranteed Senior Notes due June 2, 2023, in the original aggregate principal amount of $75,000,000 (the “Series B Notes”) and (c) 4.75% Series C Guaranteed Senior Notes due February 25, 2025, in the aggregate principal amount of $50,000,000 (the “Series C Notes”) that were outstanding under the existing senior note purchase agreement would continue to remain outstanding under the Third Restated Prudential Note Purchase Agreement and we authorized and issued our 5.47% Series D Guaranteed Senior Notes due June 21, 2028, in the aggregate principal amount of $50,000,000 (the “Series D Notes” and, together with the Series A Notes, Series B Notes and Series C Notes, the “Notes”). The Third Restated Prudential Note Purchase Agreement does not provide for scheduled reductions in the principal balance of the Notes prior to their respective maturities. On June 21, 2018, we entered into a note purchase and guarantee agreement (the “MetLife Note Purchase Agreement”) with MetLife and certain of its affiliates. Pursuant to the MetLife Note Purchase Agreement, we authorized and issued our 5.47% Series E Guaranteed Senior Notes due June 21, 2028, in the aggregate principal amount of $50,000,000 (the “Series E Notes”). The MetLife Note Purchase Agreement does not provide for scheduled reductions in the principal balance of the Series E Notes prior to its maturity. Covenants The Restated Credit Agreement, the Third Restated Prudential Note Purchase Agreement and the MetLife Note Purchase Agreement contain customary financial covenants such as leverage, coverage ratios and minimum tangible net worth, as well as limitations on restricted payments, which may limit our ability to incur additional debt or pay dividends. The Restated Credit Agreement, the Third Restated Prudential Note Purchase Agreement and the MetLife Note Purchase Agreement also contain customary events of default, including cross defaults to each other, change of control and failure to maintain REIT status (provided that the Third Restated Prudential Note Purchase Agreement and the MetLife Note Purchase Agreement require a mandatory offer to prepay the notes upon a change in control in lieu of a change of control event of default). Any event of default, if not cured or waived in a timely manner, would increase by 200 basis points (2.00%) the interest rate we pay under the Restated Credit Agreement, the Third Restated Prudential Note Purchase Agreement and the MetLife Note Purchase Agreement, and could result in the acceleration of our indebtedness under the Restated Credit Agreement, the Third Restated Prudential Note Purchase Agreement and the MetLife Note Purchase Agreement. We may be prohibited from drawing funds under the Revolving Facility if there is any event or condition that constitutes an event of default under the Restated Credit Agreement or that, with the giving of any notice, the passage of time, or both, would be an event of default under the Restated Credit Agreement. As of December 31, 2018, we are in compliance with all of the material terms of the Restated Credit Agreement, the Third Restated Prudential Note Purchase Agreement and the MetLife Note Purchase Agreement, including the various financial covenants described herein. Debt Maturities As of December 31, 2018, scheduled debt maturities, including balloon payments, are as follows (in thousands): Revolving Facility Term Loan Senior Unsecured Notes Total 2019 $ — $ — $ — $ - 2020 — — — — 2021 — — 100,000 100,000 2022 (1) 70,000 — — 70,000 2023 — 50,000 75,000 125,000 Thereafter — — 150,000 150,000 Total $ 70,000 $ 50,000 $ 325,000 $ 445,000 (1) The Revolving Facility matures in March 2022. Subject to the terms of the Restated Credit Agreement and our continued compliance with its provisions, we have the option to extend the term of the Revolving Facility for one additional year to March 2023.

Environmental Obligations

Environmental Obligations	12 Months Ended
	Dec. 31, 2018
Environmental Remediation Obligations [Abstract]
Environmental Obligations	NOTE 5. — ENVIRONMENTAL OBLIGATIONS We are subject to numerous federal, state and local laws and regulations, including matters relating to the protection of the environment such as the remediation of known contamination and the retirement and decommissioning or removal of long-lived assets including buildings containing hazardous materials, USTs and other equipment. Environmental costs are principally attributable to remediation costs which are incurred for, among other things, removing USTs, excavation of contaminated soil and water, installing, operating, maintaining and decommissioning remediation systems, monitoring contamination and governmental agency compliance reporting required in connection with contaminated properties. We seek reimbursement from state UST remediation funds related to these environmental costs where available. The estimated future costs for known environmental remediation requirements are accrued when it is probable that a liability has been incurred and a reasonable estimate of fair value can be made. The accrued liability is the aggregate of our estimate of the fair value of cost for each component of the liability, net of estimated recoveries from state UST remediation funds considering estimated recovery rates developed from prior experience with the funds. In July 2012, we purchased a 10-year pollution legal liability insurance policy covering substantially all of our properties at that time for preexisting unknown environmental liabilities and new environmental events. The policy has a $50,000,000 aggregate limit and is subject to various self-insured retentions and other conditions and limitations. Our intention in purchasing this policy was to obtain protection predominantly for significant events. No assurances can be given that we will obtain a net financial benefit from this investment. In addition to the environmental insurance policy purchased by the Company, we also took assignment of certain environmental insurance policies, and rights to reimbursement for claims made thereunder, from Marketing, by order of the U.S. Bankruptcy Court during Marketing’s bankruptcy proceedings. Under these assigned polices, we have received and expect to continue to receive reimbursement of certain remediation expenses for covered claims. We enter into leases and various other agreements which contractually allocate responsibility between the parties for known and unknown environmental liabilities at or relating to the subject properties. We are contingently liable for these environmental obligations in the event that our tenant or other counterparty does not satisfy them. It is possible that our assumptions regarding the ultimate allocation method and share of responsibility that we used to allocate environmental liabilities may change, which may result in material adjustments to the amounts recorded for environmental litigation accruals and environmental remediation liabilities. We are required to accrue for environmental liabilities that we believe are allocable to others under our leases and other agreements if we determine that it is probable that our tenant or other counterparty will not meet its environmental obligations. We may ultimately be responsible to pay for environmental liabilities as the property owner if our tenant or other counterparty fails to pay them. We assess whether to accrue for environmental liabilities based upon relevant factors including our tenants’ histories of paying for such obligations, our assessment of their financial capability, and their intent to pay for such obligations. However, there can be no assurance that our assessments are correct or that our tenants who have paid their obligations in the past will continue to do so. The ultimate resolution of these matters could cause a material adverse effect on our business, financial condition, results of operations, liquidity, ability to pay dividends or stock price. For substantially all of our triple-net leases, our tenants are contractually responsible for compliance with environmental laws and regulations, removal of USTs at the end of their lease term (the cost of which in certain cases is partially borne by us) and remediation of any environmental contamination that arises during the term of their tenancy. Under the terms of our leases covering properties previously leased to Marketing (substantially all of which commenced in 2012), we have agreed to be responsible for environmental contamination at the premises that was known at the time the lease commenced, and for environmental contamination which existed prior to commencement of the lease and is discovered (other than as a result of a voluntary site investigation) during the first 10 years of the lease term (or a shorter period for a minority of such leases). After expiration of such 10-year (or, in certain cases, shorter) period, responsibility for all newly discovered contamination, even if it relates to periods prior to commencement of the lease, is contractually allocated to our tenant. Our tenants at properties previously leased to Marketing are in all cases responsible for the cost of any remediation of contamination that results from their use and occupancy of our properties. Under substantially all of our other triple-net leases, responsibility for remediation of all environmental contamination discovered during the term of the lease (including known and unknown contamination that existed prior to commencement of the lease) is the responsibility of our tenant. We anticipate that a majority of the USTs at properties previously leased to Marketing will be replaced over the next several years because these USTs are either at or near the end of their useful lives. For long-term, triple-net leases covering sites previously leased to Marketing, our tenants are responsible for the cost of removal and replacement of USTs and for remediation of contamination found during such UST removal and replacement, unless such contamination was found during the first 10 years of the lease term and also existed prior to commencement of the lease. In those cases, we are responsible for costs associated with the remediation of such contamination. We have also agreed to be responsible for environmental contamination that existed prior to the sale of certain properties assuming the contamination is discovered (other than as a result of a voluntary site investigation) during the first five years after the sale of the properties. For properties that are vacant, we are responsible for costs associated with UST removals and for the cost of remediation of contamination found during the removal of USTs. In the course of certain UST removals and replacements at properties previously leased to Marketing where we retained continuing responsibility for preexisting environmental obligations, previously unknown environmental contamination was and continues to be discovered. As a result, we have developed a reasonable estimate of fair value for the prospective future environmental liability resulting from preexisting unknown environmental contamination and have accrued for these estimated costs. These estimates are based primarily upon quantifiable trends which we believe allow us to make reasonable estimates of fair value for the future costs of environmental remediation resulting from the removal and replacement of USTs. Our accrual of the additional liability represents our estimate of the fair value of cost for each component of the liability, net of estimated recoveries from state UST remediation funds considering estimated recovery rates developed from prior experience with the funds. In arriving at our accrual, we analyzed the ages of USTs at properties where we would be responsible for preexisting contamination found within 10 years after commencement of a lease (for properties subject to long-term triple-net leases) or five years from a sale (for divested properties), and projected a cost to closure for preexisting unknown environmental contamination. We measure our environmental remediation liabilities at fair value based on expected future net cash flows, adjusted for inflation (using a range of 2.0% to 2.75%), and then discount them to present value (using a range of 4.0% to 7.0%). We adjust our environmental remediation liabilities quarterly to reflect changes in projected expenditures, changes in present value due to the passage of time and reductions in estimated liabilities as a result of actual expenditures incurred during each quarter. As of December 31, 2018, we had accrued a total of $59,821,000 for our prospective environmental remediation obligations. This accrual consisted of (a) $14,477,000, which was our estimate of reasonably estimable environmental remediation liability, including obligations to remove USTs for which we are responsible, net of estimated recoveries and (b) $45,344,000 for future environmental liabilities related to preexisting unknown contamination. As of December 31, 2017, we had accrued a total of $63,565,000 for our prospective environmental remediation obligations. This accrual consisted of (a) $18,537,000, which was our estimate of reasonably estimable environmental remediation liability, including obligations to remove USTs for which we are responsible, net of estimated recoveries and (b) $45,028,000 for future environmental liabilities related to preexisting unknown contamination. Environmental liabilities are accreted for the change in present value due to the passage of time and, accordingly, $2,409,000, $3,448,000 and $4,107,000 of net accretion expense was recorded for the years ended December 31, 2018, 2017 and 2016, respectively, which is included in environmental expenses. In addition, during the years ended December 31, 2018, 2017 and 2016, we recorded credits to environmental expenses, included in continuing and discontinued operations, aggregating $1,319,000, $6,854,000 and $7,007,000, respectively, where decreases in estimated remediation costs exceeded the depreciated carrying value of previously capitalized asset retirement costs. Environmental expenses also include project management fees, legal fees and environmental litigation accruals. During the years ended December 31, 2018 and 2017, we increased the carrying values of certain of our properties by $5,111,000 and $5,477,000, respectively, due to changes in estimated environmental remediation costs. The recognition and subsequent changes in estimates in environmental liabilities and the increase or decrease in carrying values of the properties are non-cash transactions which do not appear on the face of the consolidated statements of cash flows. Capitalized asset retirement costs are being depreciated over the estimated remaining life of the UST, a 10-year period if the increase in carrying value is related to environmental remediation obligations or such shorter period if circumstances warrant, such as the remaining lease term for properties we lease from others. Depreciation and amortization expense related to capitalized asset retirement costs in our consolidated statements of operations for the years ended December 31, 2018, 2017 and 2016, were $4,255,000, $4,347,000 and $5,126,000, respectively. Capitalized asset retirement costs were $45,659,000 (consisting of $20,348,000 of known environmental liabilities and $25,311,000 of reserves for future environmental liabilities) as of December 31, 2018, and $45,380,000 (consisting of $18,692,000 of known environmental liabilities and $26,688,000 of reserves for future environmental liabilities) as of December 31, 2017, respectively. We recorded impairment charges aggregating $3,850,000 and $6,932,000 for the years ended December 31, 2018 and 2017, respectively, in continuing and discontinued operations for capitalized asset retirement costs. Environmental exposures are difficult to assess and estimate for numerous reasons, including the extent of contamination, alternative treatment methods that may be applied, location of the property which subjects it to differing local laws and regulations and their interpretations, as well as the time it takes to remediate contamination and receive regulatory approval. In developing our liability for estimated environmental remediation obligations on a property by property basis, we consider, among other things, enacted laws and regulations, assessments of contamination and surrounding geology, quality of information available, currently available technologies for treatment, alternative methods of remediation and prior experience. Environmental accruals are based on estimates which are subject to significant change, and are adjusted as the remediation treatment progresses, as circumstances change, and as environmental contingencies become more clearly defined and reasonably estimable. Our estimates are based upon facts that are known to us at this time and an assessment of the possible ultimate remedial action outcomes. It is possible that our assumptions, which form the basis of our estimates, regarding our ultimate environmental liabilities may change, which may result in our providing an accrual, or adjustments to the amounts recorded, for environmental remediation liabilities. Among the many uncertainties that impact the estimates are our assumptions, the necessary regulatory approvals for, and potential modifications of remediation plans, the amount of data available upon initial assessment of contamination, changes in costs associated with environmental remediation services and equipment, the availability of state UST remediation funds and the possibility of existing legal claims giving rise to additional claims, and possible changes in the environmental rules and regulations, enforcement policies, and reimbursement programs of various states. In light of the uncertainties associated with environmental expenditure contingencies, we are unable to estimate ranges in excess of the amount accrued with any certainty; however, we believe that it is possible that the fair value of future actual net expenditures could be substantially higher than amounts currently recorded by us. Adjustments to accrued liabilities for environmental remediation obligations will be reflected in our consolidated financial statements as they become probable and a reasonable estimate of fair value can be made. Additional environmental liabilities could cause a material adverse effect on our business, financial condition, results of operations, liquidity, ability to pay dividends or stock price.

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Income Taxes	NOTE 6. — INCOME TAXES Net cash paid (refunded) for income taxes for the years ended December 31, 2018, 2017 and 2016, of $244,000, $(195,000) and $368,000, respectively, includes amounts related to state and local income taxes for jurisdictions that do not follow the federal tax rules, which are provided for in property costs in our consolidated statements of operations. Earnings and profits (as defined in the Internal Revenue Code) are used to determine the tax attributes of dividends paid to stockholders and will differ from income reported for consolidated financial statements purposes due to the effect of items which are reported for income tax purposes in years different from that in which they are recorded for consolidated financial statements purposes. The federal tax attributes of the common dividends for the years ended December 31, 2018, 2017 and 2016, were: ordinary income of 89.2%, 100.0% and 61.6%, capital gain distributions of 10.8%, 0.0% and 34.4% and non-taxable distributions of 0.0%, 0.0% and 4.0%, respectively. To qualify for taxation as a REIT, we, among other requirements such as those related to the composition of our assets and gross income, must distribute annually to our stockholders at least 90% of our taxable income, including taxable income that is accrued by us without a corresponding receipt of cash. We cannot provide any assurance that our cash flows will permit us to continue paying cash dividends. Should the Internal Revenue Service successfully assert that our earnings and profits were greater than the amount distributed, we may fail to qualify as a REIT; however, we may avoid losing our REIT status by paying a deficiency dividend to eliminate any remaining earnings and profits. We may have to borrow money or sell assets to pay such a deficiency dividend. Although tax returns for the years 2015, 2016 and 2017, and tax returns which will be filed for the year ended 2018, remain open to examination by federal and state tax jurisdictions under the respective statute of limitations, we have not currently identified any uncertain tax positions related to those years and, accordingly, have not accrued for uncertain tax positions as of December 31, 2018 or 2017. However, uncertain tax matters may have a significant impact on the results of operations for any single fiscal year or interim period.

Stockholders' Equity

Stockholders' Equity	12 Months Ended
	Dec. 31, 2018
Equity [Abstract]
Stockholders' Equity	NOTE 7. — STOCKHOLDERS’ EQUITY A summary of the changes in stockholders’ equity for the years ended December 31, 2018, 2017 and 2016, is as follows (in thousands except per share amounts): Common Stock Additional Paid-in Dividends Paid in Excess Shares Amount Capital of Earnings Total BALANCE, DECEMBER 31, 2015 33,422 $ 334 $ 464,338 $ (58,111 ) $ 406,561 Net earnings 38,411 38,411 Dividends declared — $1.03 per share (35,385 ) (35,385 ) Shares issued pursuant to ATM Program, net 653 7 14,879 14,886 Shares issued pursuant to stock dividends 256 3 4,409 4,412 Shares issued pursuant to dividend reinvestment 43 — 897 897 Stock-based compensation and settlements 19 — 1,136 — 1,136 BALANCE, DECEMBER 31, 2016 34,393 $ 344 $ 485,659 $ (55,085 ) $ 430,918 Net earnings 47,186 47,186 Dividends declared — $1.16 per share (43,675 ) (43,675 ) Shares issued pursuant to Equity Offering, net 4,715 47 104,265 — 104,312 Shares issued pursuant to ATM Program, net 513 5 13,523 — 13,528 Shares issued pursuant to dividend reinvestment 48 1 1,270 — 1,271 Stock-based compensation and settlements 27 — 155 — 155 BALANCE, DECEMBER 31, 2017 39,696 $ 397 $ 604,872 $ (51,574 ) $ 553,695 Net earnings 47,706 47,706 Dividends declared — $1.31 per share (53,555 ) (53,555 ) Shares issued pursuant to ATM Program, net 1,106 11 30,127 — 30,138 Shares issued pursuant to dividend reinvestment 52 1 1,402 — 1,403 Stock-based compensation and settlements 1 — 1,777 — 1,777 BALANCE, DECEMBER 31, 2018 40,855 $ 409 $ 638,178 $ (57,423 ) $ 581,164 On March 1, 2018, and October 23, 2018, our Board of Directors granted 121,650 and 3,000 of restricted stock units (“RSU” or “RSUs”), respectively, under our Amended and Restated 2004 Omnibus Incentive Compensation Plan. On March 1, 2017, our Board of Directors granted 94,250 of restricted stock units under our Amended and Restated 2004 Omnibus Incentive Compensation Plan. On October 24, 2017, our Board of Directors approved Articles Supplementary to our Articles of Incorporation, as amended, to reclassify 10,000,000 authorized shares of preferred stock, par value $.01 per share, into the same number of authorized but unissued shares of common stock, par value $.01 per share, subject to further classification or reclassification and issuance by our Board of Directors. The Articles Supplementary were filed with the Maryland State Department of Assessments and Taxation on October 25, 2017, and became effective on that date. On May 8, 2018, our stockholders approved an amendment to our Articles of Incorporation to increase the aggregate number of shares of stock of all classes which we have the authority to issue from 70,000,000 shares to 120,000,000 shares, by increasing (i) the aggregate number of shares of common stock which we have the authority to issue from 60,000,000 to 100,000,000 shares, and (ii) the aggregate number of shares of preferred stock which we have the authority to issue from 10,000,000 to 20,000,000 shares. Equity Offering On July 10, 2017, we entered into an underwriting agreement (the “Underwriting Agreement”) with Merrill Lynch, Pierce, Fenner & Smith Incorporated, J.P. Morgan Securities LLC and KeyBanc Capital Markets Inc., as representatives of the several underwriters (the “Underwriters”), pursuant to which we sold to the Underwriters 4,100,000 shares of common stock (the “Equity Offering”). Pursuant to the terms of the Underwriting Agreement, we granted the Underwriters a 30-day option to purchase up to an additional 615,000 shares of common stock. We received net proceeds from the Equity Offering, including the full exercise by the Underwriters of their option to purchase additional shares, of $104,312,000 after deducting the underwriting discount and offering expenses. The net proceeds of the Equity Offering were used to repay amounts outstanding under our Revolving Facility and subsequently were used to fund the Empire and Applegreen transactions ATM Program In June 2016, we established an at-the-market equity offering program (the “2016 ATM Program”), pursuant to which we were able to issue and sell shares of our common stock with an aggregate sales price of up to $125,000,000 through a consortium of banks acting as agents. The 2016 ATM Program was terminated in January 2018. In March 2018, we established a new at-the-market equity offering program (the “ATM Program”), pursuant to which we are able to issue and sell shares of our common stock with an aggregate sales price of up to $125,000,000 through a consortium of banks acting as agents. Sales of the shares of common stock may be made, as needed, from time to time in at-the-market offerings as defined in Rule 415 of the Securities Act, including by means of ordinary brokers’ transactions on the New York Stock Exchange or otherwise at market prices prevailing at the time of sale, at prices related to prevailing market prices or as otherwise agreed to with the applicable agent. During the years ended December 31, 2018 and 2017, we issued 1,106,000 and 513,000 shares of common stock, respectively, and received net proceeds of $30,138,000 and $13,528,000, respectively. Future sales, if any, will depend on a variety of factors to be determined by us from time to time, including among others, market conditions, the trading price of our common stock, determinations by us of the appropriate sources of funding for us and potential uses of funding available to us. Dividends For the year ended December 31, 2018, we paid dividends of $50,503,000 or $1.28 per share. For the year ended December 31, 2017, we paid dividends of $39,299,000 or $1.12 per share. Dividend Reinvestment Plan Our dividend reinvestment plan provides our common stockholders with a convenient and economical method of acquiring additional shares of common stock by reinvesting all or a portion of their dividend distributions. During the years ended December 31, 2018 and 2017, we issued 51,920 and 47,922 shares of common stock, respectively, under the dividend reinvestment plan and received proceeds of $1,403,000 and $1,271,000, respectively. Stock-Based Compensation Compensation cost for our stock-based compensation plans using the fair value method was $1,777,000, $1,350,000 and $1,426,000 for the years ended December 31, 2018, 2017 and 2016, respectively, and is included in general and administrative expense in our consolidated statements of operations.

Employee Benefit Plans

Employee Benefit Plans	12 Months Ended
	Dec. 31, 2018
Postemployment Benefits [Abstract]
Employee Benefit Plans	NOTE 8. — EMPLOYEE BENEFIT PLANS The Getty Realty Corp. 2004 Omnibus Incentive Compensation Plan (the “2004 Plan”) provided for the grant of restricted stock, restricted stock units (“RSUs”), performance awards, dividend equivalents, stock payments and stock awards to all employees and members of the Board of Directors. In May 2014, an Amended and Restated 2004 Omnibus Incentive Compensation Plan (the “Restated Plan”) was approved at our annual meeting of stockholders. The Restated Plan maintained the 2004 Plan’s authorization to grant awards with respect to an aggregate of 1,000,000 shares of common stock, extended the term to May 2019 and increased the aggregate maximum number of shares of common stock that may be subject to awards granted during any calendar year to 100,000. In May 2017, the Second Amended and Restated 2004 Omnibus Incentive Compensation Plan in order to, among other things, (i) increase by 500,000 to a total of 1,500,000 the aggregate number of shares that the Company may issue under awards granted pursuant to the Second Restated Plan; (ii) increase from 100,000 to 200,000 the maximum number of shares that may be subject to awards made in a calendar year to all participants under the Second Restated Plan; and (iii) In April 2012, the Compensation Committee of the Board of Directors adopted, for 2012 only, a performance-based incentive compensation feature to our compensation program for named executive officers (“NEOs”) and other executives. Under the 2012 performance-based incentive compensation program, the RSUs that were granted, were granted on terms substantially consistent with the 2004 Plan, except for the relative vesting schedules. RSUs granted under the 2012 performance-based incentive compensation program vest on a cumulative basis, with the first 20% vesting occurring on May 1, 2013, and an additional 20% vesting on each May 1 thereafter, through May 1, 2017. In February 2013, the Compensation Committee granted a total of 35,000 RSUs to NEOs and other executives under the 2012 performance-based incentive compensation program. All such RSU grants include related dividend equivalents. We awarded to employees and directors 124,650, 94,250 and 86,600 RSUs and dividend equivalents in 2018, 2017 and 2016, respectively. RSUs granted before 2009 provide for settlement upon termination of employment with the Company or termination of service from the Board of Directors. RSUs granted in 2009 and thereafter provide for settlement upon the earlier of 10 years after grant or termination of employment with the Company. On the settlement date each vested RSU will have a value equal to one share of common stock and may be settled, at the sole discretion of the Compensation Committee, in cash or by the issuance of one share of common stock. The RSUs do not provide voting or other stockholder rights unless and until the RSU is settled for a share of common stock. The RSUs vest starting one year from the date of grant, on a cumulative basis at the annual rate of 20% of the total number of RSUs covered by the award. The dividend equivalents represent the value of the dividends paid per common share multiplied by the number of RSUs covered by the award. For the years ended December 31, 2018, 2017 and 2016, dividend equivalents aggregating approximately $749,000, $542,000 and $445,000, respectively, were charged against retained earnings when common stock dividends were declared. The following is a schedule of the activity relating to RSUs outstanding: Number of Fair Value RSUs Outstanding Amount Average Per RSU RSUs OUTSTANDING AT DECEMBER 31, 2015 400,375 Granted 86,600 $ 1,593,400 $ 18.40 Settled (34,650 ) 635,800 18.35 Cancelled (22,550 ) $ 415,400 $ 18.42 RSUs OUTSTANDING AT DECEMBER 31, 2016 429,775 Granted 94,250 $ 2,484,400 $ 26.36 Settled (51,770 ) 1,306,300 25.23 Cancelled (23,330 ) $ 587,100 $ 25.17 RSUs OUTSTANDING AT DECEMBER 31, 2017 448,925 Granted 124,650 $ 3,106,400 $ 24.92 Settled — — — Cancelled — $ — $ — RSUs OUTSTANDING AT DECEMBER 31, 2018 573,575 The fair values of the RSUs were determined based on the closing market price of our stock on the date of grant. The fair value of the grants is recognized as compensation expense ratably over the five-year vesting period of the RSUs. Compensation expense related to RSUs for the years ended December 31, 2018, 2017 and 2016, was $1,752,000, $1,328,000 and $1,418,000, respectively, and is included in general and administrative expense in our consolidated statements of operations. As of December 31, 2018, there was $5,121,000 of unrecognized compensation cost related to RSUs granted under the 2004 Plan, which cost is expected to be recognized over a weighted average period of approximately three years. The aggregate intrinsic value of the 573,575 outstanding RSUs and the 289,020 vested RSUs as of December 31, 2018, was $16,869,000 and $8,500,000, respectively. The following is a schedule of the vesting activity relating to RSUs outstanding: Number of RSUs Vested Fair Value RSUs VESTED AT DECEMBER 31, 2015 202,344 Vested 54,125 $ 1,379,600 Settled (34,650 ) $ 635,800 RSUs VESTED AT DECEMBER 31, 2016 221,819 Vested 55,336 $ 1,502,900 Settled (51,770 ) $ 1,306,300 RSUs VESTED AT DECEMBER 31, 2017 225,385 Vested 63,635 $ 1,871,500 Settled — $ — RSUs VESTED AT DECEMBER 31, 2018 289,020 We have a retirement and profit sharing plan with deferred 401(k) savings plan provisions (the “Retirement Plan”) for employees meeting certain service requirements and a supplemental plan for executives (the “Supplemental Plan”). Under the terms of these plans, the annual discretionary contributions to the plans are determined by the Compensation Committee of the Board of Directors. Also, under the Retirement Plan, employees may make voluntary contributions and we have elected to match an amount equal to fifty percent of such contributions but in no event more than three percent of the employee’s eligible compensation. Under the Supplemental Plan, a participating executive may receive an amount equal to 10 percent of eligible compensation, reduced by the amount of any contributions allocated to such executive under the Retirement Plan. Contributions, net of forfeitures, under the retirement plans approximated $295,000, $282,000 and $268,000 for the years ended December 31, 2018, 2017 and 2016, respectively. These amounts are included in general and administrative expense in our consolidated statements of operations. During the year ended December 31, 2017 and 2016, we distributed $278,000 and $469,000, respectively from the Supplemental Plan to former officers of the Company. There were no distributions from the Supplemental Plan for the year ended December 31, 2018.

Earnings Per Common Share

Earnings Per Common Share	12 Months Ended
	Dec. 31, 2018
Earnings Per Share [Abstract]
Earnings Per Common Share	NOTE 9. — EARNINGS PER COMMON SHARE Basic and diluted earnings per common share gives effect, utilizing the two-class method, to the potential dilution from the issuance of shares of our common stock in settlement of RSUs which provide for non-forfeitable dividend equivalents equal to the dividends declared per common share. Basic and diluted earnings per common share is computed by dividing net earnings less dividend equivalents attributable to RSUs by the weighted average number of common shares outstanding during the year. Diluted earnings per common share, also gives effect to the potential dilution from the exercise of stock options utilizing the treasury stock method. There were no options outstanding as of December 31, 2018 and 2017. There were 5,000 stock options excluded from the earnings per share calculations below as they were anti-dilutive as of December 31, 2016. The following table is a reconciliation of the numerator and denominator used in the computation of basic and diluted earnings per common share using the two-class method (in thousands except per share data): Year ended December 31, (in thousands): 2018 2017 2016 Earnings from continuing operations $ 48,410 $ 45,048 $ 39,825 Less dividend equivalents attributable to RSUs outstanding (751 ) (567 ) (482 ) Earnings from continuing operations attributable to common stockholders 47,659 44,481 39,343 Earnings (loss) from discontinued operations (704 ) 2,138 (1,414 ) Less dividend equivalents attributable to RSUs outstanding — — — Earnings (loss) from discontinued operations attributable to common stockholders (704 ) 2,138 (1,414 ) Net earnings attributable to common stockholders used for basic and diluted earnings per share calculation $ 46,955 $ 46,619 $ 37,929 Weighted average common shares outstanding: Basic 40,171 36,897 33,806 Incremental shares from stock-based compensation 20 — — Diluted 40,191 36,897 33,806 Basic earnings per common share $ 1.17 $ 1.26 $ 1.12 Diluted earnings per common share $ 1.17 $ 1.26 $ 1.12

Fair Value Measurements

Fair Value Measurements	12 Months Ended
	Dec. 31, 2018
Fair Value Disclosures [Abstract]
Fair Value Measurements	NOTE 10. — FAIR VALUE MEASUREMENTS Debt Instruments As of December 31, 2018 and 2017, the carrying value of the borrowings under the Restated Credit Agreement approximated fair value. As of December 31, 2018 and 2017, the fair value of the borrowings under senior unsecured notes was $335,600,000 and $233,500,000, respectively. The fair value of the borrowings outstanding as of December 31, 2018 and 2017, was determined using a discounted cash flow technique that incorporates a market interest yield curve with adjustments for duration, risk profile and borrowings outstanding, which are based on unobservable inputs within Level 3 of the Fair Value Hierarchy. Supplemental Retirement Plan We have mutual fund assets that are measured at fair value on a recurring basis using Level 1 inputs. We have a Supplemental Retirement Plan for executives. The amounts held in trust under the Supplemental Retirement Plan using Level 2 inputs may be used to satisfy claims of general creditors in the event of our or any of our subsidiaries’ bankruptcy. We have liability to the executives participating in the Supplemental Retirement Plan for the participant account balances equal to the aggregate of the amount invested at the executives’ direction and the income earned in such mutual funds. The following summarizes as of December 31, 2018, our assets and liabilities measured at fair value on a recurring basis by level within the Fair Value Hierarchy (in thousands): Level 1 Level 2 Level 3 Total Assets: Mutual funds $ 534 $ — $ — $ 534 Liabilities: Deferred compensation $ — $ 534 $ — $ 534 The following summarizes as of December 31, 2017, our assets and liabilities measured at fair value on a recurring basis by level within the Fair Value Hierarchy (in thousands): Level 1 Level 2 Level 3 Total Assets: Mutual funds $ 451 $ — $ — $ 451 Liabilities: Deferred compensation $ — $ 451 $ — $ 451 Real Estate Assets We have certain real estate assets that are measured at fair value on a non-recurring basis using Level 3 inputs as of December 31, 2018 and 2017, of $3,096,000 and $2,785,000, respectively, where impairment charges have been recorded. Due to the subjectivity inherent in the internal valuation techniques used in estimating fair value, the amounts realized from the sale of such assets may vary significantly from these estimates.

Discontinued Operations and Ass

Discontinued Operations and Assets Held For Sale	12 Months Ended
	Dec. 31, 2018
Discontinued Operations And Disposal Groups [Abstract]
Discontinued Operations and Assets Held For Sale	NOTE 11. — DISCONTINUED OPERATIONS AND ASSETS HELD FOR SALE We report as discontinued operations properties which met the criteria to be accounted for as held for sale in accordance with GAAP as of June 30, 2014, and certain properties disposed of during the periods presented that were previously classified as held for sale as of June 30, 2014. All results of these discontinued operations are included in a separate component of income on the consolidated statements of operations under the caption discontinued operations. During the year ended December 31, 2018, we sold nine properties, in separate transactions that did not meet the criteria to be classified as discontinued operations, which resulted in an aggregate gain of $3,888,000, included in gain on dispositions of real estate, on our consolidated statements of operations. We also received funds from property condemnations resulting in a gain of $60,000, included in gain on dispositions of real estate, on our consolidated statements of operations. During the year ended December 31, 2017, we sold 12 properties and a portion of one property, in separate transactions that did not meet the criteria to be classified as discontinued operations, which resulted in an aggregate gain of $1,025,000, included in gain on dispositions of real estate, on our consolidated statements of operations. We also received funds from property condemnations resulting in a gain of $16,000, included in gain on dispositions of real estate, on our consolidated statements of operations. As of December 31, 2018 and 2017, there were no properties that met criteria to be classified as held for sale. Activity from discontinued operations was as follows (in thousands): Year ended December 31, 2018 2017 2016 Total revenues $ — $ — $ — Impairments (1,268 ) (1,042 ) (4,248 ) Changes in environmental estimates 564 3,169 3,010 Other operating income — 11 2 Earnings (loss) from operating activities (704 ) 2,138 (1,236 ) (Loss) gains from dispositions of real estate — — (178 ) Earnings (loss) from discontinued operations $ (704 ) $ 2,138 $ (1,414 )

Quarterly Financial Data

Quarterly Financial Data	12 Months Ended
	Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]
Quarterly Financial Data	NOTE 12. — QUARTERLY FINANCIAL DATA The following is a summary of the quarterly results of operations for the years ended December 31, 2018 and 2017 (unaudited as to quarterly information) (in thousands, except per share amounts): Three Months Ended Year Ended December 31, 2018 March 31, June 30, September 30, December 31, Revenues from rental properties $ 28,284 $ 29,022 $ 29,570 $ 29,452 Earnings from continuing operations 10,162 13,823 11,017 13,408 Net earnings $ 10,032 $ 13,540 $ 10,944 $ 13,190 Diluted earnings per common share: Earnings from continuing operations $ 0.25 $ 0.34 $ 0.27 $ 0.33 Net earnings $ 0.25 $ 0.33 $ 0.27 $ 0.32 Year Ended December 31, 2017 March 31, June 30, September 30, December 31, Revenues from rental properties $ 23,897 $ 24,364 $ 24,913 $ 28,158 Earnings from continuing operations 7,716 14,551 9,460 13,321 Net earnings $ 9,704 $ 15,106 $ 9,340 $ 13,036 Diluted earnings per common share: Earnings from continuing operations $ 0.22 $ 0.41 $ 0.24 $ 0.33 Net earnings $ 0.28 $ 0.43 $ 0.24 $ 0.33

Property Acquisitions

Property Acquisitions	12 Months Ended
	Dec. 31, 2018
Business Combinations [Abstract]
Property Acquisitions	NOTE 13. — PROPERTY ACQUISITIONS 2018 During the year ended December 31, 2018, we acquired fee simple interests in 41 convenience store and gasoline station, and other automotive related properties for an aggregate purchase price of $77,972,000. On April 17, 2018, we acquired fee simple interests in 30 convenience store and gasoline station properties for $52,592,000 and entered into a unitary lease with GPM Investments, LLC (“GPM”) at the closing of the transaction. We funded the GPM transaction through funds available under our Revolving Facility. The unitary lease provides for an initial term of 15 years, with four five-year renewal options. The unitary lease requires GPM to pay a fixed annual rent plus all amounts pertaining to the properties, including environmental expenses, real estate taxes, assessments, license and permit fees, charges for public utilities and all other governmental charges. Rent is scheduled to increase annually during the initial and renewal terms of the lease. The properties are located primarily within metropolitan markets in the states of Arkansas, Louisiana, Oklahoma and Texas. We accounted for the acquisition of the properties as an asset acquisition. We estimated the fair value of acquired tangible assets (consisting of land, buildings and improvements) “as if vacant.” Based on these estimates, we allocated $31,633,000 of the purchase price to land, $17,489,000 to buildings and improvements, $4,047,000 to in-place leases, and $577,000 to below-market leases, which is accounted for as a deferred liability. On August 1, 2018, we acquired fee simple interests in six convenience store and gasoline station properties for $17,412,000 and entered into a unitary lease with a U.S. subsidiary of Applegreen PLC (“Applegreen”) at the closing of the transaction. We funded the Applegreen transaction through funds available under our Revolving Facility. The unitary lease provides for an initial term of 15 years, with four five-year renewal options. The unitary lease requires Applegreen to pay a fixed annual rent plus all amounts pertaining to the properties, including environmental expenses, real estate taxes, assessments, license and permit fees, charges for public utilities and all other governmental charges. Rent is scheduled to increase annually during the initial and renewal terms of the lease. The properties are all located within the metropolitan market of Columbia, SC. We accounted for the acquisition of the properties as an asset acquisition. We estimated the fair value of acquired tangible assets (consisting of land, buildings and improvements) “as if vacant.” Based on these estimates, we allocated $8,930,000 of the purchase price to land, $6,773,000 to buildings and improvements, $1,371,000 to in-place leases, $773,000 to above-market leases and $435,000 to below-market leases, which is accounted for as a deferred liability. In addition, during the year ended December 31, 2018, we also acquired fee simple interests in five convenience store and gasoline station, and other automotive related properties, in separate transactions, for an aggregate purchase price of $7,968,000. We accounted for these acquisitions as asset acquisitions. We estimated the fair value of acquired tangible assets for each of these acquisitions (consisting of land, buildings and improvements) “as if vacant.” Based on these estimates, we allocated $4,929,000 of the purchase price to land, $2,753,000 to buildings and improvements and $286,000 to in-place leases. 2017 During the year ended December 31, 2017, we acquired fee simple interests in 103 convenience store and gasoline station, and other automotive related properties for an aggregate purchase price of $214,000,000. On September 6, 2017, we acquired fee simple interests in 49 convenience store and gasoline station properties for $123,126,000 and entered into a unitary lease with Empire Petroleum Partners, LLC (“Empire”) at the closing of the transaction. We funded the Empire transaction through a combination of funds from our Equity Offering and funds available under our Revolving Facility. The unitary lease provides for an initial term of 15 years, with four five-year renewal options. The unitary lease requires Empire to pay a fixed annual rent plus all amounts pertaining to the properties including environmental expenses, real estate taxes, assessments, license and permit fees, charges for public utilities and all other governmental charges. Rent is scheduled to increase annually during the initial and renewal terms of the lease. The properties are located primarily within metropolitan markets in the states of Arizona, Colorado, Florida, Georgia, Louisiana, New Mexico and Texas. We accounted for the acquisition of the properties as an asset acquisition. We estimated the fair value of acquired tangible assets (consisting of land, buildings and improvements) “as if vacant.” Based on these estimates, we allocated $75,674,000 of the purchase price to land, $38,205,000 to buildings and improvements, $189,000 to above-market leases and $9,058,000 to in-place leases. On October 3, 2017, we acquired fee simple interests in 33 convenience store and gasoline station properties and five stand-alone Burger King quick service restaurants for $68,710,000 and entered into a unitary lease with a U.S. subsidiary of Applegreen at the closing of the transaction. We funded the Applegreen transaction through a combination of funds from our Equity Offering and funds available under our Revolving Facility. The unitary lease provides for an initial term of 15 years, with four five-year renewal options. The unitary lease requires Applegreen to pay a fixed annual rent plus all amounts pertaining to the properties including environmental expenses, real estate taxes, assessments, license and permit fees, charges for public utilities and all other governmental charges. Rent is scheduled to increase on the fifth anniversary of the commencement of the lease and annually thereafter. The properties are all located within the metropolitan market of Columbia, SC. We accounted for the acquisition of the properties as an asset acquisition. We estimated the fair value of acquired tangible assets (consisting of land, buildings and improvements) “as if vacant.” Based on these estimates, we allocated $36,874,000 of the purchase price to land, $27,431,000 to buildings and improvements, $961,000 to above-market leases, $1,104,000 to below-market leases, which is accounted for as a deferred liability, and $4,548,000 to in-place leases. In addition, during the year ended December 31, 2017, we acquired fee simple interests in 16 convenience store and gasoline station, and other automotive related properties, in separate transactions, for an aggregate purchase price of $22,164,000. We accounted for these acquisitions as asset acquisitions. We estimated the fair value of acquired tangible assets for each of these acquisitions (consisting of land, buildings and improvements) “as if vacant.” Based on these estimates, we allocated $5,800,000 of the purchase price to land, $14,424,000 to buildings and improvements, $1,028,000 to below-market leases, which is accounted for as a deferred liability, and $2,969,000 to in-place leases. We evaluated each of the acquisitions and determined that substantially all the fair value related to each acquisition is concentrated in a similar identifiable operating property. Accordingly, these transactions did not meet the definition of a business and consequently were accounted for as asset acquisitions. In each of these transactions, we allocated the total consideration for each acquisition to the individual assets acquired on a relative fair value basis.

Acquired Intangible Assets

Acquired Intangible Assets	12 Months Ended
	Dec. 31, 2018
Goodwill And Intangible Assets Disclosure [Abstract]
Acquired Intangible Assets	NOTE 14. — ACQUIRED INTANGIBLE ASSETS Acquired above-market (when we are a lessor) and below-market leases (when we are a lessee) are included in prepaid expenses and other assets and had a balance of $3,500,000 and $3,189,000 (net of accumulated amortization of $5,160,000 and $4,698,000, respectively) at December 31, 2018 and 2017, respectively. Acquired above-market (when we are lessee) and below-market (when we are lessor) leases are included in accounts payable and accrued liabilities and had a balance of $21,514,000 and $22,714,000 (net of accumulated amortization of $17,790,000 and $15,578,000, respectively) at December 31, 2018 and 2017, respectively. When we are a lessor, above-market and below-market leases are amortized and recorded as either an increase (in the case of below-market leases) or a decrease (in the case of above-market leases) to rental revenue over the remaining term of the associated lease in place at the time of purchase. When we are a lessee, above-market and below-market leases are amortized and recorded as either an increase (in the case of below-market leases) or a decrease (in the case of above-market leases) to rental expense over the remaining term of the associated lease in place at the time of purchase. Rental income included amortization from acquired leases of $2,067,000, $1,791,000 and $1,833,000 for the years ended December 31, 2018, 2017 and 2016, respectively. Rent expense included amortization from acquired leases of $317,000, $320,000 and $333,000 for the years ended December 31, 2018, 2017 and 2016, respectively. In-place leases are included in prepaid expenses and other assets and had a balance of $38,542,000 and $35,704,000 (net of accumulated amortization of $9,908,000 and $7,043,000, respectively) at December 31, 2018 and 2017, respectively. The value associated with in-place leases and lease origination costs are amortized into depreciation and amortization expense over the remaining life of the lease. Depreciation and amortization expense included amortization from in-place leases of $2,866,000, $1,855,000 and $1,395,000 for the years ended December 31, 2018, 2017 and 2016, respectively. The amortization for acquired intangible assets during the next five years and thereafter, assuming no early lease terminations, is as follows: As Lessor: Above-Market Leases Below-Market Leases In-Place Leases Year ending December 31, 2019 $ 158,000 $ 2,142,000 $ 2,994,000 2020 152,000 1,736,000 2,973,000 2021 144,000 1,562,000 2,954,000 2022 135,000 1,484,000 2,942,000 2023 135,000 1,393,000 2,940,000 Thereafter 1,330,000 13,197,000 23,739,000 $ 2,054,000 $ 21,514,000 $ 38,542,000 As Lessee: Below-Market Leases Year ending December 31, 2019 $ 312,000 2020 222,000 2021 157,000 2022 127,000 2023 126,000 Thereafter 502,000 $ 1,446,000

Subsequent Events

Subsequent Events	12 Months Ended
	Dec. 31, 2018
Subsequent Events [Abstract]
Subsequent Events	NOTE 15. — SUBSEQUENT EVENTS In preparing our consolidated financial statements, we have evaluated events and transactions occurring after December 31, 2018, for recognition or disclosure purposes. Based on this evaluation there were no significant subsequent events from December 31, 2018, through the date the financial statements were issued.

SCHEDULE II - Valuation and Qua

SCHEDULE II - Valuation and Qualifying Accounts and Reserves	12 Months Ended
	Dec. 31, 2018
Valuation And Qualifying Accounts [Abstract]
SCHEDULE II - Valuation and Qualifying Accounts and Reserves	GETTY REALTY CORP. and SUBSIDIARIES for the years ended December 31, 2018, 2017 and 2016 (in thousands) Balance at Beginning of Year Additions Deductions Balance at End of Year December 31, 2018: Allowance for deferred rent receivable $ — $ — $ — $ — Allowance for accounts receivable $ 1,840 $ 480 $ 226 $ 2,094 December 31, 2017: Allowance for deferred rent receivable $ — $ — $ — $ — Allowance for accounts receivable $ 2,006 $ 420 $ 586 $ 1,840 December 31, 2016: Allowance for deferred rent receivable $ — $ — $ — $ — Allowance for accounts receivable $ 2,634 $ 855 $ 1,483 $ 2,006

SCHEDULE III - Real Estate and

SCHEDULE III - Real Estate and Accumulated Depreciation and Amortization	12 Months Ended
	Dec. 31, 2018
Text Block [Abstract]
SCHEDULE III - Real Estate Assets and Accumulated Depreciation	GETTY REALTY CORP. and SUBSIDIARIES As of December 31, 2018 (in thousands) The summarized changes in real estate assets and accumulated depreciation are as follows: 2018 2017 2016 Investment in real estate: Balance at beginning of year $ 970,964 $ 782,166 $ 783,233 Acquisitions and capital expenditures 84,069 205,598 19,097 Impairments (7,950 ) (10,623 ) (13,590 ) Sales and condemnations (3,091 ) (4,520 ) (6,379 ) Lease expirations/settlements (886 ) (1,657 ) (195 ) Balance at end of year $ 1,043,106 $ 970,964 $ 782,166 Accumulated depreciation and amortization: Balance at beginning of year $ 133,353 $ 120,576 $ 107,370 Depreciation and amortization 20,549 17,018 16,629 Impairments (1,780 ) (1,301 ) (776 ) Sales and condemnations (530 ) (1,229 ) (2,559 ) Lease expirations/settlements (901 ) (1,711 ) (88 ) Balance at end of year $ 150,691 $ 133,353 $ 120,576 Gross Amount at Which Carried at Close of Period Initial Cost of Leasehold or Acquisition Investment to Company (1) Cost Capitalized Subsequent to Initial Investment Land Building and Improvements Total Cost Accumulated Depreciation Date of Initial Leasehold or Acquisition Investment (1) Bluff, AR $ 2,985 $ - $ 2,166 $ 819 $ 2,985 $ 30 2018 Brookland, AR 1,468 - 149 1,319 1,468 615 2007 Fayetteville, AR 2,266 - 1,637 629 2,266 23 2018 Fayetteville, AR 2,867 - 1,971 896 2,867 33 2018 Hope, AR 1,472 - 999 473 1,472 18 2018 Jonesboro, AR 868 - 173 695 868 338 2007 Jonesboro, AR 2,985 - 330 2,655 2,985 1285 2007 Little Rock, AR 978 - 535 443 978 19 2018 Rogers, AR 927 - 533 394 927 17 2018 Texarkana, AR 1,592 - 1,058 534 1,592 21 2018 Cochise, AZ 1,765 - 269 1,496 1,765 133 2017 Cochise, AZ 4,440 - 1,849 2,591 4,440 182 2017 Maricopa, AZ 1,331 - 992 339 1,331 30 2017 Maricopa, AZ 1,448 - 983 465 1,448 40 2017 Maricopa, AZ 1,503 - 839 664 1,503 55 2017 Maricopa, AZ 1,602 - 796 806 1,602 68 2017 Maricopa, AZ 1,722 - 1,178 544 1,722 45 2017 Maricopa, AZ 1,838 - 1,261 577 1,838 50 2017 Maricopa, AZ 2,177 - 1,532 645 2,177 53 2017 Maricopa, AZ 2,185 - 1,612 573 2,185 48 2017 Maricopa, AZ 2,415 - 433 1,982 2,415 140 2017 Maricopa, AZ 2,868 - 1,255 1,613 2,868 128 2017 Maricopa, AZ 3,112 - 1,593 1,519 3,112 118 2017 Maricopa, AZ 3,169 - 2,005 1,164 3,169 87 2017 Maricopa, AZ 3,204 - 1,839 1,365 3,204 106 2017 Maricopa, AZ 3,928 - 2,334 1,594 3,928 116 2017 Phoenix, AZ 1,943 - 1,311 632 1,943 18 2018 Pima, AZ 1,261 - 664 597 1,261 49 2017 Pima, AZ 1,301 - 557 744 1,301 60 2017 Pima, AZ 1,303 - 590 713 1,303 58 2017 Pima, AZ 2,085 - 1,487 598 2,085 52 2017 Pima, AZ 3,652 - 2,924 728 3,652 59 2017 Pinal, AZ 4,022 - 2,549 1,473 4,022 119 2017 Bellflower, CA 1,369 - 910 459 1,369 271 2007 Benicia, CA 2,224 - 1,058 1,166 2,224 714 2007 Chula Vista, CA 2,385 - 889 1,496 2,385 299 2014 Coachella, CA 2,235 - 1,217 1,018 2,235 589 2007 Cotati, CA 6,072 - 4,008 2,064 6,072 407 2015 Fillmore, CA 1,354 - 950 404 1,354 238 2007 Grass Valley, CA 1,485 - 853 632 1,485 128 2015 Hesperia, CA 1,643 - 849 794 1,643 440 2007 Hesperia, CA 2,055 - 492 1,563 2,055 375 2015 Indio, CA 1,250 - 302 948 1,250 201 2015 Indio, CA 2,727 - 1,486 1,241 2,727 276 2015 La Palma, CA 1,971 - 1,389 582 1,971 339 2007 La Puenta, CA 7,615 - 6,405 1,210 7,615 282 2015 Lakeside, CA 3,715 - 2,695 1,020 3,715 226 2015 Los Angeles, CA 6,612 - 5,006 1,606 6,612 371 2015 Oakland, CA 5,434 - 4,123 1,311 5,434 298 2015 Ontario, CA 6,613 - 4,523 2,090 6,613 483 2015 Phelan, CA 4,611 - 3,276 1,335 4,611 315 2015 Riverside, CA 2,130 - 1,619 511 2,130 144 2015 Riverside, CA 2,737 - 1,216 1,521 2,737 333 2014 Sacramento, CA 3,193 - 2,207 986 3,193 232 2015 Sacramento, CA 4,247 - 2,604 1,643 4,247 343 2015 Sacramento, CA 5,942 - 4,233 1,709 5,942 381 2015 San Dimas, CA 1,941 - 749 1,192 1,941 617 2007 San Jose, CA 5,412 - 4,219 1,193 5,412 297 2015 San Leandro, CA 5,978 - 5,078 900 5,978 220 2015 Shingle Springs, CA 4,751 - 3,489 1,262 4,751 290 2015 Stockton, CA 1,187 - 627 560 1,187 132 2015 Stockton, CA 3,001 - 1,460 1,541 3,001 327 2015 Adams, CO 2,157 - 1,579 578 2,157 50 2017 Arapahoe, CO 2,495 - 2,207 288 2,495 29 2017 Arapahoe, CO 2,874 - 2,284 590 2,874 49 2017 Boulder, CO 3,900 - 2,875 1,025 3,900 214 2015 Broomfield, CO 2,380 - 1,496 884 2,380 67 2017 Castle Rock, CO 5,269 - 3,269 2,000 5,269 446 2015 El Paso, CO 1,382 - 756 626 1,382 49 2017 El Paso, CO 3,274 - 2,865 409 3,274 36 2017 El Paso, CO 3,828 - 2,798 1,030 3,828 94 2017 Golden, CO 4,641 - 3,247 1,394 4,641 302 2015 Greenwood Village, CO 4,077 - 2,889 1,188 4,077 246 2015 Highlands Ranch, CO 4,356 - 2,921 1,435 4,356 318 2015 Jefferson, CO 1,785 - 1,388 397 1,785 36 2017 Lakewood, CO 2,349 - 1,541 808 2,349 170 2015 Littleton, CO 4,139 - 2,272 1,867 4,139 413 2015 Lone Tree, CO 6,612 - 5,125 1,487 6,612 344 2015 Longmont, CO 3,619 - 2,315 1,304 3,619 302 2015 Louisville, CO 6,605 - 5,228 1,377 6,605 313 2015 Morrison, CO 5,081 - 3,018 2,063 5,081 472 2015 Superior, CO 3,748 - 2,477 1,271 3,748 281 2015 Thornton, CO 5,003 - 2,722 2,281 5,003 505 2015 Westminster, CO 1,457 - 752 705 1,457 152 2015 Wheat Ridge, CO 6,151 - 4,201 1,950 6,151 445 2015 Avon, CT 731 50 403 378 781 279 2002 Bridgeport, CT 59 380 24 415 439 251 1982 Bridgeport, CT 313 298 204 407 611 225 1985 Bridgeport, CT 350 330 228 452 680 268 1985 Bridgeport, CT 377 391 246 522 768 326 1985 Bristol, CT 1,594 - 1,036 558 1,594 316 2004 Brookfield, CT 58 432 20 470 490 305 1985 Darien, CT 667 285 434 518 952 424 1985 Durham, CT 994 - - 994 994 994 2004 East Hartford, CT 208 224 54 378 432 262 1982 Ellington, CT 1,295 - 842 453 1,295 257 2004 Farmington, CT 466 - 303 163 466 92 2004 Franklin, CT 51 447 20 478 498 312 1982 Hamden, CT 645 - 527 118 645 1 2018 Hartford, CT 665 - 432 233 665 132 2004 Manchester, CT 110 323 50 383 433 206 1987 Meriden, CT 208 341 84 465 549 289 1982 Meriden, CT 1,532 - 989 543 1,532 312 2004 Middletown, CT 133 735 131 737 868 349 1987 New Haven, CT 217 297 141 373 514 196 1985 New Haven, CT 539 219 351 407 758 333 1985 New Haven, CT 1,413 (323 ) 569 521 1,090 208 1985 Newington, CT 954 - 620 334 954 189 2004 North Haven, CT 90 669 365 394 759 192 1982 North Haven, CT, CT 405 - 252 153 405 95 2004 Norwalk, CT 511 46 332 225 557 195 1985 Norwalk, CT - 941 402 539 941 270 1988 Norwich, CT 107 323 44 386 430 226 1982 Old Greenwich, CT - 1,219 620 599 1,219 277 1969 Plymouth, CT 931 - 605 326 931 185 2004 Ridgefield, CT 402 304 167 539 706 378 1985 South Windham, CT 644 1,398 598 1,444 2,042 664 2004 South Windsor, CT 545 - 337 208 545 130 2004 Stamford, CT 507 16 330 193 523 164 1985 Stamford, CT 604 98 393 309 702 233 1985 Stamford, CT 507 453 330 630 960 357 1985 Suffield, CT 237 603 201 639 840 505 2004 Vernon, CT 1,434 - - 1,434 1,434 1,434 2004 Wallingford, CT 551 - 335 216 551 138 2004 Waterbury, CT 469 - 305 164 469 93 2004 Waterbury, CT 515 - 335 180 515 102 2004 Waterbury, CT 804 - 516 288 804 167 2004 Watertown, CT 352 59 204 207 411 168 1992 Watertown, CT 925 - 567 358 925 225 2004 West Haven, CT 185 322 74 433 507 269 1982 West Haven, CT 1,215 - 790 425 1,215 241 2004 Westport, CT 604 12 393 223 616 189 1985 Wethersfield, CT 447 - - 447 447 447 2004 Willimantic, CT 717 - 466 251 717 142 2004 Wilton, CT 519 214 338 395 733 295 1985 Windsor Locks, CT 1,031 - 670 361 1,031 204 2004 Windsor Locks, CT 1,434 1,400 1,055 1,779 2,834 1,484 2004 Washington, DC 848 - 418 430 848 121 2013 Washington, DC 941 - 664 277 941 90 2013 Nassau, FL 1,963 - 570 1,393 1,963 102 2017 Nassau, FL 2,137 - 382 1,755 2,137 129 2017 Nassau, FL 2,894 - 2,056 838 2,894 71 2017 Orlando, FL 867 34 401 500 901 378 2000 Houston, GA 1,724 - 1,312 412 1,724 37 2017 Richmond, GA 3,150 - 286 2,864 3,150 236 2017 Haleiwa, HI 1,522 - 1,058 464 1,522 325 2007 Honolulu, HI 1,071 30 981 120 1,101 82 2007 Honolulu, HI 1,539 - 1,219 320 1,539 184 2007 Honolulu, HI 1,769 - 1,192 577 1,769 310 2007 Honolulu, HI 9,211 - 8,194 1,017 9,211 562 2007 Kaneohe, HI 1,364 - 822 542 1,364 329 2007 Kaneohe, HI 1,977 165 1,473 669 2,142 360 2007 Waianae, HI 1,520 - 648 872 1,520 469 2007 Waianae, HI 1,997 - 871 1,126 1,997 609 2007 Waipahu, HI 2,458 - 945 1,513 2,458 789 2007 Prospect Heights, IL 1,547 - 698 849 1,547 28 2018 Bossier, LA 2,181 - 1,333 848 2,181 71 2017 Lake Charles, LA 1,069 - 620 449 1,069 18 2018 Lake Charles, LA 1,468 - 1,002 466 1,468 17 2018 Sulphur, LA 777 - 375 402 777 18 2018 Arlington, MA 519 27 338 208 546 178 1985 Auburn, MA - 535 388 147 535 51 1996 Auburn, MA 600 - 600 - 600 - 2011 Auburn, MA 625 - 625 - 625 - 2011 Auburn, MA 370 305 240 435 675 245 1991 Auburn, MA 725 - 725 - 725 - 2011 Auburn, MA 800 - - 800 800 605 2011 Barre, MA 536 12 348 200 548 127 1991 Bedford, MA 1,350 - 1,350 - 1,350 - 2011 Bellingham, MA 734 73 476 331 807 289 1985 Belmont, MA 390 29 254 165 419 143 1985 Bradford, MA 650 - 650 - 650 - 2011 Burlington, MA 600 - 600 - 600 - 2011 Burlington, MA 1,250 - 1,250 - 1,250 - 2011 Chelmsford, MA 715 - - 715 715 325 2012 Dracut, MA 450 - 450 - 450 - 2011 Falmouth, MA 414 2,320 458 2,276 2,734 64 1988 Fitchburg, MA 390 33 254 169 423 118 1992 Foxborough, MA 427 98 325 200 525 151 1990 Framingham, MA 400 23 260 163 423 111 1991 Gardner, MA 550 - 550 - 550 - 2011 Gardner, MA 1,009 327 657 679 1,336 494 1985 Gardners, MA 787 - 638 149 787 42 2014 Hingham, MA 353 111 243 221 464 169 1989 Hyde Park, MA 500 168 322 346 668 235 1985 Leominster, MA 571 - 199 372 571 131 2012 Littleton, MA 1,357 - 759 598 1,357 45 2017 Lowell, MA 361 90 201 250 451 247 1985 Lowell, MA - 631 429 202 631 69 1996 Lynn, MA 400 - 400 - 400 - 2011 Lynn, MA 850 - 850 - 850 - 2011 Marlborough, MA 550 - 550 - 550 - 2011 Maynard, MA 736 98 479 355 834 258 1985 Melrose, MA 600 - 600 - 600 - 2011 Methuen, MA 300 134 150 284 434 234 1986 Methuen, MA 380 64 246 198 444 176 1985 Methuen, MA 490 98 319 269 588 192 1985 Methuen, MA 650 - 650 - 650 - 2011 Newton, MA 691 98 450 339 789 300 1985 Peabody, MA 400 18 252 166 418 166 1986 Peabody, MA 550 - 550 - 550 - 2011 Peabody, MA 650 - 650 - 650 - 2011 Randolph, MA 573 238 430 381 811 267 1985 Revere, MA 1,300 - 1,300 - 1,300 - 2011 Rockland, MA 579 45 377 247 624 214 1985 Salem, MA 600 - 600 - 600 - 2011 Seekonk, MA 1,073 (373 ) 576 124 700 59 1985 Shrewsbury, MA 400 - 400 - 400 - 2011 Shrewsbury, MA 450 - 450 - 450 - 2011 Sterling, MA 476 2 309 169 478 107 1991 Sutton, MA 714 57 464 307 771 214 1993 Tewksbury, MA 125 545 75 595 670 267 1986 Tewksbury, MA 1,200 - 1,200 - 1,200 - 2011 Upton, MA 429 114 279 264 543 154 1991 Wakefield, MA 900 - 900 - 900 - 2011 Walpole, MA 450 92 293 249 542 174 1985 Watertown, MA 358 209 321 246 567 171 1985 Webster, MA 1,012 711 659 1,064 1,723 622 1985 West Roxbury, MA 490 105 319 276 595 212 1985 Westborough, MA 450 - 450 - 450 - 2011 Wilmington, MA 600 - 600 - 600 - 2011 Wilmington, MA 1,300 - 1,300 - 1,300 - 2011 Woburn, MA 350 64 200 214 414 204 1986 Woburn, MA 508 394 508 394 902 292 1985 Worcester, MA 400 - 400 - 400 - 2011 Worcester, MA 500 - 500 - 500 - 2011 Worcester, MA 550 - 550 - 550 - 2011 Worcester, MA 548 10 356 202 558 130 1991 Worcester, MA 498 383 322 559 881 329 1985 Worcester, MA 978 8 636 350 986 222 1991 Worchester, MA 196 812 - 1,008 1,008 29 2017 Accokeek, MD 692 - 692 - 692 - 2010 Baltimore, MD 802 - - 802 802 473 2007 Baltimore, MD 2,259 - 722 1,537 2,259 814 2007 Beltsville, MD 525 - 525 - 525 - 2009 Beltsville, MD 731 - 731 - 731 - 2009 Beltsville, MD 1,050 - 1,050 - 1,050 - 2009 Beltsville, MD 1,130 - 1,130 - 1,130 - 2009 Bladensburg, MD 571 - 571 - 571 - 2009 Bowie, MD 1,084 - 1,084 - 1,084 - 2009 Capitol Heights, MD 628 - 628 - 628 - 2009 Clinton, MD 651 - 651 - 651 - 2009 College Park, MD 445 - 445 - 445 - 2009 College Park, MD 536 - 536 - 536 - 2009 District Heights, MD 479 - 479 - 479 - 2009 Ellicott City, MD 895 - - 895 895 555 2007 Forestville, MD 1,039 - 1,039 - 1,039 - 2009 Fort Washington, MD 422 - 422 - 422 - 2009 Greenbelt, MD 1,153 - 1,153 - 1,153 - 2009 Hyattsville, MD 491 - 491 - 491 - 2009 Hyattsville, MD 594 - 594 - 594 - 2009 Landover, MD 662 - 662 - 662 - 2009 Landover, MD 753 - 753 - 753 - 2009 Landover Hills, MD 457 - 457 - 457 - 2009 Landover Hills, MD 1,358 - 1,358 - 1,358 - 2009 Lanham, MD 822 - 822 - 822 - 2009 Laurel, MD 696 - 696 - 696 - 2009 Laurel, MD 1,210 - 1,210 - 1,210 - 2009 Laurel, MD 1,267 - 1,267 - 1,267 - 2009 Laurel, MD 1,415 - 1,415 - 1,415 - 2009 Laurel, MD 1,530 - 1,530 - 1,530 - 2009 Laurel, MD 2,523 - 2,523 - 2,523 - 2009 Oxon Hill, MD 1,256 - 1,256 - 1,256 - 2009 Riverdale, MD 582 - 582 - 582 - 2009 Seat Pleasant, MD 468 - 468 - 468 - 2009 Suitland, MD 673 - 673 - 673 - 2009 Upper Marlboro, MD 845 - 845 - 845 - 2009 Biddeford, ME 618 8 235 391 626 391 1985 Lewiston, ME 342 188 222 308 530 229 1985 Davidson, NC 1,776 - 301 1,475 1,776 79 2017 Fayetteville, NC 986 - 509 477 986 19 2018 Kernersville, NC 449 - 338 111 449 105 2007 New Bern, NC 350 83 190 243 433 168 2007 Belfield, ND 1,232 - 382 850 1,232 753 2007 Allenstown, NH 1,787 - 467 1,320 1,787 759 2007 Concord, NH 675 - 675 - 675 - 2011 Concord, NH 900 - 900 - 900 - 2011 Derry, NH 418 17 158 277 435 276 1987 Derry, NH 950 - 950 - 950 - 2011 Dover, NH 650 - 650 - 650 - 2011 Dover, NH 1,200 - 1,200 - 1,200 - 2011 Goffstown, NH 1,737 - 697 1,040 1,737 457 2012 Hooksett, NH 1,562 - 824 738 1,562 671 2007 Kingston, NH 1,500 - 1,500 - 1,500 - 2011 Londonderry, NH 703 30 458 275 733 235 1985 Londonderry, NH 1,100 - 1,100 - 1,100 - 2011 Manchester, NH 550 - 550 - 550 - 2011 Nashua, NH 500 - 500 - 500 - 2011 Nashua, NH 550 - 550 - 550 - 2011 Nashua, NH 750 - 750 - 750 - 2011 Nashua, NH 825 - 825 - 825 - 2011 Nashua, NH 1,132 - 780 352 1,132 33 2017 Nashua, NH 1,750 - 1,750 - 1,750 - 2011 Northwood, NH 500 - 500 - 500 - 2011 Pelham, NH - 730 317 413 730 120 1996 Plaistow, NH 300 101 245 156 401 156 1987 Portsmouth, NH 525 - 525 - 525 - 2011 Raymond, NH 550 - 550 - 550 - 2011 Rochester, NH 700 - 700 - 700 - 2011 Rochester, NH 939 12 600 351 951 296 1985 Rochester, NH 1,400 - 1,400 - 1,400 - 2011 Rochester, NH 1,600 - 1,600 - 1,600 - 2011 Salem, NH 743 20 484 279 763 236 1985 Salem, NH 450 871 350 971 1,321 122 1986 Basking Ridge, NJ 363 284 200 447 647 278 1986 Bergenfield, NJ 381 323 300 404 704 225 1990 Brick, NJ 1,508 229 1,000 737 1,737 509 2000 Colonia, NJ 719 (299 ) 72 348 420 282 1985 Elizabeth, NJ 406 33 227 212 439 188 1985 Flemington, NJ 709 (252 ) 168 289 457 120 1985 Flemington, NJ 547 17 346 218 564 185 1985 Fort Lee, NJ 1,245 365 811 799 1,610 538 1985 Franklin Twp, NJ 684 169 445 408 853 352 1985 Freehold, NJ 495 533 95 933 1,028 170 1978 Hasbrouck Heights, NJ 640 483 416 707 1,123 449 1985 Hillsborough, NJ 238 182 100 320 420 245 1985 Lake Hopatcong, NJ 1,305 - 800 505 1,305 436 2000 Livingston, NJ 872 292 568 596 1,164 391 1985 Long Branch, NJ 515 439 335 619 954 323 1985 Mcafee, NJ 671 448 437 682 1,119 342 1985 Midland Park, NJ 201 309 150 360 510 208 1989 Mountainside, NJ 664 (197 ) 134 333 467 152 1985 North Bergen, NJ 630 147 410 367 777 296 1985 North Plainfield, NJ 227 544 175 596 771 448 1978 Paramus, NJ 382 81 249 214 463 150 1985 Parlin, NJ 418 159 203 374 577 158 1985 Paterson, NJ 619 17 403 233 636 198 1985 Ridgewood, NJ 703 398 458 643 1,101 395 1985 Trenton, NJ 1,303 - 1,146 157 1,303 58 2012 Union, NJ 437 214 239 412 651 192 1985 Washington Township, NJ 912 334 594 652 1,246 394 1985 Watchung, NJ 449 114 226 337 563 140 1985 West Orange, NJ 800 409 521 688 1,209 475 1985 Bernalillo, NM 1,829 - 1,382 447 1,829 37 2017 Bernalillo, NM 2,308 - 1,830 478 2,308 43 2017 Bernalillo, NM 2,322 - 1,796 526 2,322 45 2017 Bernalillo, NM 3,682 - 3,141 541 3,682 48 2017 Dona Ana, NM 1,842 - 1,374 468 1,842 40 2017 Fernley, NV 1,665 - 221 1,444 1,665 366 2015 Alfred Station, NY 714 - 414 300 714 154 2006 Amherst, NY 223 246 173 296 469 141 2000 Astoria, NY 1,684 - 1,105 579 1,684 188 2013 Avoca, NY 936 (1 ) 635 300 935 154 2006 Batavia, NY 684 - 364 320 684 164 2006 Bay Shore, NY 157 355 86 426 512 286 1981 Bayside, NY 470 254 306 418 724 227 1985 Brewster, NY 789 - 789 - 789 - 2011 Briarcliff Manor, NY 652 553 502 703 1,205 515 1976 Bronx, NY 423 - 423 - 423 - 2013 Bronx, NY 390 54 251 193 444 171 1985 Bronx, NY 877 - 877 - 877 - 2013 Bronx, NY 884 - 884 - 884 - 2013 Bronx, NY 953 - 953 - 953 - 2013 Bronx, NY 1,049 - 485 564 1,049 184 2013 Bronx, NY 1,910 - 1,349 561 1,910 191 2013 Bronx, NY 2,408 - 1,712 696 2,408 214 2013 Bronxville, NY 1,232 - 1,232 - 1,232 - 2011 Brooklyn, NY 100 345 67 378 445 227 1972 Brooklyn, NY 75 382 31 426 457 264 1967 Brooklyn, NY 282 271 176 377 553 361 1967 Brooklyn, NY 148 437 104 481 585 294 1972 Brooklyn, NY 237 372 154 455 609 233 1985 Brooklyn, NY 476 320 306 490 796 316 1985 Brooklyn, NY 422 383 275 530 805 322 1985 Brooklyn, NY 627 313 408 532 940 342 1985 Buffalo, NY 313 241 151 403 554 228 2000 Byron, NY 969 - 669 300 969 154 2006 Chester, NY 1,158 - 1,158 - 1,158 - 2011 Churchville, NY 1,012 - 602 410 1,012 210 2006 Corona, NY 115 300 113 302 415 302 1965 Corona, NY 2,543 - 1,903 640 2,543 200 2013 Cortland Manor, NY 1,872 - 1,872 - 1,872 - 2011 Dobbs Ferry, NY 670 34 434 270 704 232 1985 Dobbs Ferry, NY 1,345 - 1,345 - 1,345 - 2011 East Hampton, NY 660 39 428 271 699 233 1985 East Pembroke, NY 787 - 537 250 787 128 2006 Eastchester, NY 1,724 993 2,302 415 2,717 45 2011 Elmont, NY 389 319 231 477 708 333 1978 Elmsford, NY - 948 581 367 948 244 1971 Elmsford, NY 1,453 - 1,453 - 1,453 - 2011 Fishkill, NY 1,793 - 1,793 - 1,793 - 2011 Floral Park, NY 616 170 356 430 786 275 1998 Flushing, NY 516 241 320 437 757 258 1998 Flushing, NY 1,936 - 1,413 523 1,936 170 2013 Flushing, NY 1,947 - 1,405 542 1,947 162 2013 Flushing, NY 2,478 - 1,801 677 2,478 203 2013 Forrest Hills, NY 1,273 - 1,273 - 1,273 - 2013 Franklin Square, NY 153 331 137 347 484 195 1978 Garden City, NY 362 242 236 368 604 210 1985 Garnerville, NY 1,508 - 1,508 - 1,508 - 2011 Glen Head, NY 235 216 103 348 451 348 1982 Glen Head, NY 463 282 301 444 745 275 1985 Great Neck, NY 500 252 450 302 752 166 1985 Hartsdale, NY 1,626 - 1,626 - 1,626 - 2011 Hawthorne, NY 2,084 - 2,084 - 2,084 - 2011 Hopewell Junction, NY 1,163 - 1,163 - 1,163 - 2011 Huntington Station, NY 141 284 84 341 425 202 1978 Hyde Park, NY 990 - 990 - 990 - 2011 Katonah, NY 1,084 - 1,084 - 1,084 - 2011 Lakeville, NY 1,028 - 203 825 1,028 537 2008 Levittown, NY 503 42 327 218 545 189 1985 Levittown, NY 547 86 356 277 633 231 1985 Long Island City, NY 2,717 - 1,183 1,534 2,717 416 2013 Mamaroneck, NY 1,429 - 1,429 - 1,429 - 2011 Massapequa, NY 333 285 217 401 618 228 1985 Mastic, NY 313 110 204 219 423 202 1985 Middletown, NY 719 - 719 - 719 - 2011 Middletown, NY 751 274 489 536 1,025 348 1985 Middletown, NY 1,281 - 1,281 - 1,281 - 2011 Millwood, NY 1,448 - 1,448 - 1,448 - 2011 Mount Kisco, NY 1,907 - 1,907 - 1,907 - 2011 Mount Vernon, NY 985 - 985 - 985 - 2011 Nanuet, NY 2,316 - 2,316 - 2,316 - 2011 Naples, NY 1,257 - 827 430 1,257 221 2006 New Paltz, NY 971 - 971 - 971 - 2011 New Rochelle, NY 189 358 104 443 547 240 1982 New Rochelle, NY 1,887 - 1,887 - 1,887 - 2011 New Windsor, NY 1,084 - 1,084 - 1,084 - 2011 New York, NY 126 399 78 447 525 309 1972 Newburgh, NY 527 - 527 - 527 - 2011 Newburgh, NY 1,192 - 1,192 - 1,192 - 2011 Niskayuna, NY 425 35 275 185 460 185 1986 North Andover, NY 393 33 256 170 426 148 1985 Ossining, NY 231 198 117 312 429 171 1985 Ozone Park, NY 58 365 45 378 423 228 1976 Peekskill, NY 2,207 - 2,207 - 2,207 - 2011 Pelham, NY 1,035 - 1,035 - 1,035 - 2011 Pelham Manor, NY 137 307 75 369 444 230 1985 Perry, NY 1,444 - 1,044 400 1,444 205 2006 Pleasant Valley, NY 398 62 240 220 460 209 1986 Port Chester, NY 941 - - 941 941 443 2011 Port Chester, NY 1,015 - 1,015 - 1,015 - 2011 Port Jefferson, NY 185 3,080 246 3,019 3,265 14 1985 Poughkeepsie, NY 591 - 591 - 591 - 2011 Poughkeepsie, NY 1,020 - 1,020 - 1,020 - 2011 Poughkeepsie, NY 1,232 (32 ) 1,200 - 1,200 - 2011 Poughkeepsie, NY 1,340 (60 ) 1,280 - 1,280 - 2011 Poughkeepsie, NY 1,306 - 1,306 - 1,306 - 2011 Poughkeepsie, NY 1,355 - 1,355 - 1,355 - 2011 Prattsburgh, NY 553 - 303 250 553 128 2006 Rego Park, NY 2,783 - 2,104 679 2,783 213 2013 Riverhead, NY 724 - 432 292 724 241 1998 Rockaway Park, NY 1,605 - 1,605 - 1,605 - 2013 Rockville Centre, NY 350 66 201 215 416 197 1985 Rye, NY 872 - 872 - 872 - 2011 Sag Harbor, NY 704 35 458 281 739 241 1985 Sayville, NY 344 246 300 290 590 134 1998 Scarsdale, NY 1,301 - 1,301 - 1,301 - 2011 Shrub Oak, NY 1,061 368 691 738 1,429 511 1985 Sleepy Hollow, NY 281 301 130 452 582 392 1969 Spring Valley, NY 749 - 749 - 749 - 2011 St. Albans, NY 330 106 215 221 436 183 1985 Staten Island, NY 390 89 254 225 479 203 1985 Staten Island, NY 301 323 196 428 624 263 1985 Staten Island, NY 350 290 228 412 640 244 1985 Stony Brook, NY 176 281 105 352 457 210 1978 Tarrytown, NY 956 - 956 - 956 - 2011 Tuchahoe, NY 1,650 - 1,650 - 1,650 - 2011 Wantagh, NY 640 - 370 270 640 219 1998 Wappingers Falls, NY 452 - - 452 452 323 2011 Wappingers Falls, NY 1,488 - 1,488 - 1,488 - 2011 Warsaw, NY 990 - 690 300 990 154 2006 Warwick, NY 1,049 - 1,049 - 1,049 - 2011 West Nyack, NY 936 - 936 - 936 - 2011 White Plains, NY - 569 303 266 569 204 1972 White Plains, NY 1,458 - 1,458 - 1,458 - 2011 Yaphank, NY - 798 375 423 798 182 1993 Yonkers, NY - 588 - 588 588 345 1970 Yonkers, NY - 944 684 260 944 114 1990 Yonkers, NY 1,021 63 665 419 1,084 361 1985 Yonkers, NY 291 1,050 216 1,125 1,341 542 1972 Yonkers, NY 1,907 - 1,907 - 1,907 - 2011 Yorktown Heights, NY 1,700 - - 1,700 1,700 274 2013 Yorktown Heights, NY 2,365 - 2,365 - 2,365 - 2011 Clermont, OH 1,045 - 362 683 1,045 64 2017 Crestline, OH 1,202 - 285 917 1,202 463 2008 Mansfield, OH 922 - 332 590 922 280 2008 Mansfield, OH 1,950 - 700 1,250 1,950 587 2009 Monroeville, OH 2,580 - 485 2,095 2,580 970 2009 Summit, OH 1,530 - 385 1,145 1,530 95 2017 Oklahoma City, OK 868 - 371 497 868 19 2018 Oklahoma City, OK 1,182 - 587 595 1,182 22 2018 Oklahoma City, OK 1,311 - 625 686 1,311 24 2018 Banks, OR 498 - 498 - 498 - 2015 Estacada, OR 646 - 84 562 646 109 2015 Marion, OR 543 - 296 247 543 29 2017 Marion, OR 956 - 456 500 956 50 2017 Pendleton, OR 766 - 122 644 766 138 2015 Portland, OR 4,416 - 3,368 1,048 4,416 213 2015 Salem, OR 1,071 - 399 672 1,071 174 2015 Salem, OR 1,350 - 521 829 1,350 172 2015 Salem, OR 1,408 - 524 884 1,408 190 2015 Salem, OR 4,215 - 3,182 1,033 4,215 226 2015 Salem, OR 4,614 - 3,517 1,097 4,614 225 2015 Springfield, OR 1,398 - 796 602 1,398 152 2015 Yamhill, OR 2,867 - 394 2,473 2,867 192 2017 Allison Park, PA 1,500 - 850 650 1,500 444 2010 Harrisburg, PA 399 213 199 413 612 329 1989 Lancaster, PA 642 18 300 360 660 360 1989 New Kensington, PA 1,375 - 675 700 1,375 269 2010 Philadelphia, PA 405 175 264 316 580 263 1985 Philadelphia, PA 1,252 - 814 438 1,252 177 2009 Phoenixville, PA 385 89 76 398 474 27 1985 Pottsville, PA, PA 452 1 148 305 453 304 1990 Reading, PA 750 49 - 799 799 799 1989 Barrington, RI 490 180 319 351 670 266 1985 East Providence,, RI 2,298 (1,855 ) 14 429 443 74 1985 N. Providence, RI 543 158 353 348 701 255 1985 Columbia, SC 1,995 - 1,130 865 1,995 21 2018 Columbia, SC 2,109 - 1,120 989 2,109 23 2018 Columbia, SC 2,531 - 1,612 919 2,531 21 2018 Johns Island, SC 2,561 - 1,885 676 2,561 6 2018 Kershaw, SC 2,082 - 1,166 916 2,082 68 2017 Kershaw, SC 2,177 - 974 1,203 2,177 84 2017 Lexington, SC 412 - 145 267 412 19 2017 Lexington, SC 633 - 309 324 633 24 2017 Lexington, SC 694 - 172 522 694 41 2017 Lexington, SC 720 - 219 501 720 35 2017 Lexington, SC 816 - 336 480 816 27 2017 Lexington, SC 973 - 582 391 973 30 2017 Lexington, SC 1,036 - 434 602 1,036 42 2017 Lexington, SC 1,056 - 432 624 1,056 47 2017 Lexington, SC 1,116 - 50 1,066 1,116 77 2017 Lexington, SC 1,436 - 472 964 1,436 70 2017 Lexington, SC 1,624 - 999 625 1,624 45 2017 Lexington, SC 1,644 - 1,283 361 1,644 27 2017 Lexington, SC 1,682 - 1,135 547 1,682 43 2017 Lexington, SC 1,712 - 1,410 302 1,712 19 2017 Lexington, SC 1,729 - 1,268 461 1,729 39 2017 Lexington, SC 1,738 - 1,189 549 1,738 31 2017 Lexington, SC 1,901 - 1,021 880 1,901 73 2017 Lexington, SC 2,046 - 746 1,300 2,046 90 2017 Lexington, SC 2,179 - 1,476 703 2,179 50 2017 Lexington, SC 2,230 - 934 1,296 2,230 92 2017 Lexington, SC 2,603 - 1,869 734 2,603 19 2018 Lexington, SC 3,231 - 2,001 1,230 3,231 30 2018 Lexington, SC 3,234 - 1,198 2,036 3,234 45 2018 Lexington, SC 4,413 - 3,418 995 4,413 81 2017 Richland, SC 464 - 253 211 464 16 2017 Richland, SC 575 - 345 230 575 16 2017 Richland, SC 792 - 463 329 792 25 2017 Richland, SC 868 - 455 413 868 35 2017 Richland, SC 927 - 495 432 927 27 2017 Richland, SC 1,114 - 667 447 1,114 32 2017 Richland, SC 1,246 - 69 1,177 1,246 78 2017 Richland, SC 1,339 - 867 472 1,339 34 2017 Richland, SC 1,643 - 1,302 341 1,643 19 2017 Richland, SC 2,460 - 1,569 891 2,460 71 2017 Richland, SC 2,637 - 1,254 1,383 2,637 97 2017 Richland, SC 3,217 - 2,405 812 3,217 65 2017 Richland, SC 3,371 - 2,016 1,355 3,371 104 2017 Richland, SC 3,655 - 1,742 1,913 3,655 133 2017 Richland, SC 3,950 - 2,802 1,148 3,950 84 2017 Arlington, TX 789 - 414 375 789 15 2018 Arlington, TX 1,352 - 887 465 1,352 18 2018 Arlington, TX 1,560 - 1,008 552 1,560 20 2018 Arlington, TX 1,796 - 1,189 607 1,796 23 2018 Austin, TX 462 - 274 188 462 130 2007 Austin, TX 2,368 - 738 1,630 2,368 851 2007 Austin, TX 3,511 66 1,595 1,982 3,577 1,012 2007 Center, TX 2,073 - 1,482 591 2,073 24 2018 El Paso, TX 1,278 - 825 453 1,278 38 2017 El Paso, TX 1,425 - 1,098 327 1,425 29 2017 El Paso, TX 1,679 - 1,085 594 1,679 45 2017 El Paso, TX 1,816 - 1,413 403 1,816 35 2017 El Paso, TX 2,370 - 1,767 603 2,370 47 2017 El Paso, TX 3,168 - 2,153 1,015 3,168 80 2017 Ft Worth, TX 2,115 49 866 1,298 2,164 721 2007 Garland, TX 2,208 - 1,504 704 2,208 26 2018 Garland, TX 3,296 - 245 3,051 3,296 550 2014 Garland, TX 4,439 - 439 4,000 4,439 754 2014 Grand Prairie, TX 1,413 - 914 499 1,413 20 2018 Grand Prairie, TX 2,000 - 1,415 585 2,000 22 2018 Harker Heights, TX 2,051 (9 ) 579 1,463 2,042 1,144 2007 Houston, TX 1,689 - 224 1,465 1,689 735 2007 Houston, TX 2,803 - 535 2,268 2,803 220 2016 Keller, TX 2,507 - 996 1,511 2,507 827 2007 Lewisville, TX 494 - 110 384 494 239 2008 Linden, TX 2,160 - 1,514 646 2,160 25 2018 Longview, TX 1,660 - 1,239 421 1,660 16 2018 Mesquite, TX 1,687 - 1,093 594 1,687 23 2018 Midlothian, TX 429 - 72 357 429 229 2007 Nueces, TX 1,526 - 1,056 470 1,526 36 2017 Nueces, TX 2,162 - 1,729 433 2,162 37 2017 Nueces, TX 2,400 - 1,110 1,290 2,400 99 2017 Port Arthur, TX 2,648 - 505 2,143 2,648 215 2016 Rowlett, TX 1,284 - 840 444 1,284 16 2018 San Marcos, TX 1,954 - 251 1,703 1,954 874 2007 San Patricio, TX 3,138 - 2,687 451 3,138 39 2017 Temple, TX 2,405 (10 ) 1,205 1,190 2,395 664 2007 Texarkana, TX 1,791 - 992 799 1,791 29 2018 Texarkana, TX 1,861 - 1,197 664 1,861 27 2018 Texarkana, TX 2,316 - 1,643 673 2,316 24 2018 The Colony, TX 4,396 - 337 4,059 4,396 1,992 2007 Travis, TX 1,711 - 1,364 347 1,711 31 2017 Waco, TX 3,884 - 894 2,990 3,884 1,674 2007 Wake Village, TX 1,637 - 685 952 1,637 34 2018 Watauga, TX 1,771 - 1,139 632 1,771 24 2018 Alexandria, VA 649 - 649 - 649 - 2013 Alexandria, VA 656 - 409 247 656 87 2013 Alexandria, VA 712 - 712 - 712 - 2013 Alexandria, VA 735 - 735 - 735 - 2013 Alexandria, VA 1,327 - 1,327 - 1,327 - 2013 Alexandria, VA 1,388 - 1,020 368 1,388 131 2013 Alexandria, VA 1,582 - 1,150 432 1,582 140 2013 Alexandria, VA 1,757 - 1,313 444 1,757 153 2013 Annandale, VA 1,718 - 1,718 - 1,718 - 2013 Arlington, VA 1,083 - 1,083 - 1,083 - 2013 Arlington, VA 1,464 - 1,085 379 1,464 126 2013 Arlington, VA 2,014 - 1,516 498 2,014 160 2013 Arlington, VA 2,062 - 1,603 459 2,062 146 2013 Ashland, VA 840 - 840 - 840 - 2005 Chesapeake, VA 779 (185 ) 398 196 594 72 1990 Chesapeake, VA 1,004 110 385 729 1,114 667 1990 Fairfax, VA 1,825 - 1,190 635 1,825 204 2013 Fairfax, VA 2,078 - 1,365 713 2,078 197 2013 Fairfax, VA 3,348 - 2,351 997 3,348 302 2013 Fairfax, VA 4,454 - 3,370 1,084 4,454 328 2013 Farmville, VA 1,227 - 622 605 1,227 333 2005 Fredericksburg, VA 1,279 - 469 810 1,279 446 2005 Fredericksburg, VA 1,289 30 798 521 1,319 288 2005 Fredericksburg, VA 1,716 - 996 720 1,716 397 2005 Fredericksburg, VA 3,623 - 2,828 795 3,623 438 2005 Glen Allen, VA 1,037 - 412 625 1,037 344 2005 Glen Allen, VA 1,077 - 322 755 1,077 416 2005 King William, VA 1,688 - 1,068 620 1,688 342 2005 Mechanicsville, VA 903 - 273 630 903 347 2005 Mechanicsville, VA 957 - 324 633 957 371 2005 Mechanicsville, VA 1,043 - 223 820 1,043 452 2005 Mechanicsville, VA 1,125 - 505 620 1,125 342 2005 Mechanicsville, VA 1,476 - 876 600 1,476 331 2005 Mechanicsville, VA 1,677 - 1,157 520 1,677 286 2005 Montpelier, VA 2,481 (114 ) 1,612 755 2,367 416 2005 Norfolk, VA 535 (70 ) 235 230 465 230 1990 Petersburg, VA 1,441 - 816 625 1,441 344 2005 Portsmouth, VA 563 33 222 374 596 366 1990 Richmond, VA 1,132 (41 ) 506 585 1,091 322 2005 Ruther Glen, VA 466 - 31 435 466 240 2005 Sandston, VA 722 - 102 620 722 342 2005 Spotsylvania, VA 1,290 - 490 800 1,290 441 2005 Springfield, VA 4,257 - 2,969 1,288 4,257 386 2013 Auburn, WA 3,022 - 1,965 1,057 3,022 224 2015 Bellevue, WA 1,725 - 886 839 1,725 178 2015 Chehalis, WA 1,176 - 313 863 1,176 201 2015 Colfax, WA 4,800 - 3,611 1,189 4,800 253 2015 Federal Way, WA 4,218 - 2,973 1,245 4,218 284 2015 Fife, WA 1,181 - 414 767 1,181 176 2015 Kent, WA 2,900 - 2,066 834 2,900 192 2015 Monroe, WA 2,792 - 1,556 1,236 2,792 268 2015 Port Orchard, WA 2,019 - 161 1,858 2,019 337 2015 Puyallup, WA 831 - 172 659 831 162 2015 Puyallup, WA 2,035 - 465 1,570 2,035 327 2015 Puyallup, WA 4,050 - 2,394 1,656 4,050 430 2015 Renton, WA 1,485 - 952 533 1,485 153 2015 Seattle, WA 717 - 193 524 717 107 2015 Seattle, WA 1,884 - 1,223 661 1,884 135 2015 Silverdale, WA 2,178 - 1,217 961 2,178 220 2015 Snohomish, WA 955 - 955 - 955 - 2015 South Bend, WA 760 - 121 639 760 127 2015 Tacoma, WA 518 - 518 - 518 - 2015 Tacoma, WA 671 - 671 - 671 - 2015 Tenino, WA 937 - 219 718 937 144 2015 Vancouver, WA 1,214 - 163 1,051 1,214 191 2015 Wilbur, WA 629 - 153 476 629 106 2015 Miscellaneous 45,846 15,133 21,703 39,276 60,979 26,242 various $ 978,973 64,133 $ 631,185 $ 411,921 $ 1,043,106 $ 150,691 1) Initial cost of leasehold or acquisition investment to company represents the aggregate of the cost incurred during the year in which we purchased the property for owned properties or purchased a leasehold interest in leased properties. Cost capitalized subsequent to initial investment includes investments made in previously leased properties prior to their acquisition. 2) Depreciation of real estate is computed on the straight-line method based upon the estimated useful lives of the assets, which generally range from 16 to 25 years for buildings and improvements, or the term of the lease if shorter. Leasehold interests are amortized over the remaining term of the underlying lease. 3) The aggregate cost for federal income tax purposes was approximately $1,046,120,000 at December 31, 2018.

SCHEDULE IV - Mortgage Loans on

SCHEDULE IV - Mortgage Loans on Real Estate	12 Months Ended
	Dec. 31, 2018
Mortgage Loans On Real Estate [Abstract]
SCHEDULE IV - Mortgage Loans on Real Estate	GETTY REALTY CORP. and SUBSIDIARIES As of December 31, 2018 (in thousands) Type of Loan/Borrower Description Location(s) Interest Rate Final Maturity Date Periodic Payment Terms (a) Prior Liens Face Value at Inception Amount of Principal Unpaid at Close of Period Mortgage Loans: Borrower A Seller financing East Islip, NY 9.0 % 11/2024 P & I — $ 743 $ 727 Borrower B Seller financing Middlesex, NJ 9.0 % 5/2021 P & I — 255 229 Borrower C Seller financing Valley Cottage, NY 9.0 % 10/2020 P & I — 431 381 Borrower D Seller financing Brooklyn, NY 8.0 % 6/2019 I(b) — 2,000 2,000 Borrower E Seller financing Nyack, NY 9.0 % 9/2022 P & I — 253 237 Borrower F Seller financing E. Patchogue, NY 9.0 % 8/2019 P & I — 200 169 Borrower G Seller financing Baldwin, NY 9.0 % 9/2020 P & I — 300 265 Borrower H Seller financing Norwalk, CT 9.0 % 4/2022 P & I — 319 294 Borrower I Seller financing Stafford Springs, CT 9.0 % 1/2021 P & I — 232 206 Borrower J Seller financing Waterbury, CT 9.0 % 2/2021 P & I — 171 153 Borrower K Seller financing Great Barrington, MA 9.0 % 4/2021 P & I — 58 52 Borrower L Seller financing Springfield, MA 9.0 % 7/2019 P & I — 131 98 Borrower M Seller financing Westfield, MA 9.0 % 11/2021 P & I — 303 277 Borrower N Seller financing Milford, CT 9.0 % 3/2025 P & I — 398 392 Borrower O Seller financing Fairfield, CT 9.0 % 3/2025 P & I — 390 385 Borrower P Seller financing Hartford, CT 9.0 % 3/2024 P & I — 70 68 Borrower Q Seller financing Wilmington, DE 9.0 % 11/2020 P & I — 84 74 Borrower R Seller financing Clinton, MA 9.0 % 3/2022 P & I — 158 85 Borrower S Seller financing Fairhaven, MA 9.0 % 9/2020 P & I — 458 403 Borrower T Seller financing New Bedford, MA 9.0 % 10/2021 P & I — 363 330 Borrower U Seller financing Fitchburg, MA 9.0 % 10/2021 P & I — 187 170 Borrower V Seller financing Worcester, MA 9.0 % 11/2021 P & I — 237 216 Borrower W Seller financing S. Yarmouth, MA 9.0 % 1/2022 P & I — 275 252 Borrower X Seller financing Harwich Port, MA 9.0 % 1/2022 P & I — 293 268 Borrower Y Seller financing Southbridge, MA 9.0 % 3/2021 P & I — 300 268 Borrower Z Seller financing Oxford, MA 9.0 % 3/2023 P & I — 86 81 Borrower AA Seller financing Kernersville/Lexington, NC 8.0 % 7/2026 P & I — 568 150 Borrower AB Seller financing Concord, NH 9.5 % 8/2028 P & I — 210 148 Borrower AC Seller financing Pelham, NH 9.0 % 1/2023 P & I — 73 68 Borrower AD Seller financing Bayonne, NJ 9.0 % 3/2020 P & I — 308 266 Borrower AE Seller financing Spotswood, NJ 9.0 % 1/2020 P & I — 306 263 Borrower AF Seller financing Belleville, NJ 9.0 % 3/2021 P & I — 315 282 Borrower AG Seller financing Ridgefield, NJ 9.0 % 4/2021 P & I — 172 154 Borrower AH Seller financing Irvington, NJ 9.0 % 7/2022 P & I — 300 193 Borrower AI Seller financing Jersey City, NJ 9.5 % 7/2025 P & I — 500 417 Borrower AJ Seller financing Colonia, NJ 9.0 % 7/2020 P & I — 320 280 Borrower AK Seller financing Swedesboro, NJ 9.0 % 4/2021 P & I — 77 69 Borrower AL Seller financing Piscataway, NJ 9.0 % 11/2020 P & I — 121 71 Borrower AM Seller financing Glendale, NY 9.0 % 7/2025 P & I — 525 502 Borrower AN Seller financing Seaford, NY 9.0 % 1/2020 P & I — 488 419 Borrower AO Seller financing Elmont, NY 9.0 % 10/2021 P & I — 450 364 Borrower AP Seller financing White Plains, NY 9.0 % 2/2021 P & I — 444 396 Borrower AQ Seller financing Scarsdale, NY 9.0 % 11/2025 P & I — 337 300 Borrower AR Seller financing Pleasant Valley, NY 9.0 % 9/2020 P & I — 230 202 Borrower AS Seller financing Bronx, NY 9.0 % 12/2019 P & I — 240 44 Borrower AT Seller financing Freeport, NY 9.0 % 5/2020 P & I — 206 180 Borrower AU Seller financing Wantagh, NY 9.0 % 5/2022 P & I — 455 382 Borrower AV Seller financing Colonie, NY 9.0 % 8/2023 P & I — 143 136 Borrower AW Seller financing Latham, NY 9.0 % 1/2021 P & I — 169 150 Borrower AX Seller financing Malta, NY 9.0 % 3/2023 P & I — 572 539 Borrower AY Seller financing Newburgh, NY 9.0 % 9/2021 P & I — 394 359 Borrower AZ Seller financing Coxsackie, NY 9.0 % 7/2021 P & I — 153 138 Borrower BA Seller financing Brewster, NY 9.0 % 10/2022 P & I — 554 518 Borrower BB Seller financing Cairo, NY 9.0 % 8/2023 P & I — 113 107 Borrower BC Seller financing Central Islip, NY 9.0 % 6/2023 P & I — 780 741 Borrower BD Seller financing Kenmore, NY 9.0 % 12/2020 P & I — 74 66 Borrower BE Seller financing Rochester, NY 9.0 % 2/2025 P & I — 174 171 Borrower BF Seller financing Savona, NY 9.0 % 2/2025 P & I — 157 154 Borrower BG Seller financing Rochester, NY 9.0 % 10/2025 P & I — 230 229 Borrower BH Seller financing Greigsville, NY 9.0 % 11/2025 P & I — 200 200 Borrower BI Seller financing Horsham, PA 10.0 % 7/2024 P & I — 237 117 Borrower BJ Seller financing Warwick, RI 9.0 % 8/2022 P & I — 333 309 Borrower BK Seller financing Providence, RI 9.0 % 9/2021 P & I — 184 167 Borrower BL Seller financing Warwick, RI 9.0 % 10/2021 P & I — 357 325 Borrower BM Seller financing Cranston, RI 9.0 % 8/2022 P & I — 153 142 Borrower BN Seller financing E. Providence, RI 9.0 % 2/2022 P & I — 186 171 Borrower BO Seller financing York, PA 9.0 % 2/2021 P & I — 102 91 Borrower BP Seller financing Ephrata, PA 9.0 % 10/2020 P & I — 265 158 Borrower BQ Seller financing McConnellsburg, PA 9.0 % 1/2023 P & I — 38 36 20,908 18,254 Note receivable Purchase/leaseback Various-NY 9.5 % 1/2021 I(b) 18,400 14,720 Promissory Note Various-CT 9.0 % 12/2028 (c) — 545 Total (d) $ 39,308 $ 33,519 (a) P & I = Principal and interest paid monthly. ( b ) I = Interest only paid monthly with principal deferred. ( c ) Note for funding of capital improvements. (d) The aggregate cost for federal income tax purposes approximates the amount of principal unpaid. We review payment status to identify performing versus non-performing loans. Interest income on performing loans is accrued as earned. A non-performing loan is placed on non-accrual status when it is probable that the borrower may be unable to meet interest payments as they become due. Generally, loans 90 days or more past due are placed on non-accrual status unless there is sufficient collateral to assure collectability of principal and interest. Upon the designation of non-accrual status, all unpaid accrued interest is reserved against through current income. Interest income on non-performing loans is generally recognized on a cash basis. The summarized changes in the carrying amount of mortgage loans are as follows: 2018 2017 2016 Balance at January 1, $ 32,366 $ 32,737 $ 48,455 Additions: New mortgage loans 4,287 1,505 1,814 Deductions: Loan repayments (2,368 ) (1,227 ) (16,714 ) Collection of principal (766 ) (649 ) (818 ) Balance at December 31, $ 33,519 $ 32,366 $ 32,737

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2018
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The consolidated financial statements include the accounts of Getty Realty Corp. and its wholly-owned subsidiaries. The accompanying consolidated financial statements have been prepared in conformity with accounting principles generally accepted in the United States of America (“GAAP”). We do not distinguish our principal business or our operations on a geographical basis for purposes of measuring performance. We manage and evaluate our operations as a single segment. All significant intercompany accounts and transactions have been eliminated.
Use of Estimates, Judgments and Assumptions	Use of Estimates, Judgments and Assumptions The consolidated financial statements have been prepared in conformity with GAAP, which requires management to make estimates, judgments and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the consolidated financial statements and revenues and expenses during the period reported. Estimates, judgments and assumptions underlying the accompanying consolidated financial statements include, but are not limited to, real estate, receivables, deferred rent receivable, direct financing leases, depreciation and amortization, impairment of long-lived assets, environmental remediation costs, environmental remediation obligations, litigation, accrued liabilities, income taxes and the allocation of the purchase price of properties acquired to the assets acquired and liabilities assumed. Application of these estimates and assumptions requires exercise of judgment as to future uncertainties and, as a result, actual results could differ materially from these estimates.
Reclassifications	Reclassifications Certain prior years amounts in the consolidated financial statements have been reclassified to conform to the presentation used in the year ended December 31, 2018.
Real Estate	Real Estate Real estate assets are stated at cost less accumulated depreciation and amortization. For acquisitions of real estate which are accounted for as business combinations, we estimate the fair value of acquired tangible assets (consisting of land, buildings and improvements) “as if vacant” and identified intangible assets and liabilities (consisting of leasehold interests, above-market and below-market leases, in-place leases and tenant relationships) and assumed debt. Based on these estimates, we allocate the estimated fair value to the applicable assets and liabilities. Fair value is determined based on an exit price approach, which contemplates the price that would be received from the sale of an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. We expense transaction costs associated with business combinations in the period incurred. Acquisitions of real estate which do not meet the definition of a business are accounted for as asset acquisitions. The accounting model for asset acquisitions is similar to the accounting model for business combinations except that the acquisition costs are capitalized and allocated to the individual assets acquired and liabilities assumed on a relative fair value basis. For additional information regarding property acquisitions, see Note 13 – Property Acquisitions. We capitalize direct costs, including costs such as construction costs and professional services, and indirect costs associated with the development and construction of real estate assets while substantive activities are ongoing to prepare the assets for their intended use. The capitalization period begins when development activities are underway and ends when it is determined that the asset is substantially complete and ready for its intended use. We evaluate the held for sale classification of our real estate as of the end of each quarter. Assets that are classified as held for sale are recorded at the lower of their carrying amount or fair value less costs to sell. When real estate assets are sold or retired, the cost and related accumulated depreciation and amortization is eliminated from the respective accounts and any gain or loss is credited or charged to income. We evaluate real estate sale transactions where we provide seller financing to determine sale and gain recognition in accordance with GAAP. Expenditures for maintenance and repairs are charged to income when incurred.
Depreciation and Amortization	Depreciation and Amortization Depreciation of real estate is computed on the straight-line method based upon the estimated useful lives of the assets, which generally range from 16 to 25 years for buildings and improvements, or the term of the lease if shorter. Asset retirement costs are depreciated over the shorter of the remaining useful lives of USTs or 10 years for asset retirement costs related to environmental remediation obligations, which costs are attributable to the group of assets identified at a property. Leasehold interests and in-place leases are amortized over the remaining term of the underlying lease.
Direct Financing Leases	Direct Financing Leases Income under direct financing leases is included in revenues from rental properties and is recognized over the lease terms using the effective interest rate method which produces a constant periodic rate of return on the net investments in the leased properties. The investments in direct financing leases are increased for interest income earned and amortized over the life of the leases and reduced by the receipt of lease payments. We consider direct financing leases to be past-due or delinquent when a contractually required payment is not remitted in accordance with the provisions of the underlying agreement. We evaluate each account individually and set up an allowance when, based upon current information and events, it is probable that we will be unable to collect all amounts due according to the existing contractual terms, and the amount can be reasonably estimated. We review our direct financing leases at least annually to determine whether there has been an-other-than-temporary decline in the current estimate of residual value of the property. The residual value is our estimate of what we could realize upon the sale of the property at the end of the lease term, based on market information and third-party estimates where available. If this review indicates that a decline in residual value has occurred that is other-than-temporary, we recognize an impairment charge. There were no impairments of any of our direct financing leases during the years ended December 31, 2018 and 2017. When we enter into a contract to sell properties that are recorded as direct financing leases, we evaluate whether we believe that it is probable that the disposition will occur. If we determine that the disposition is probable and therefore the property’s holding period is reduced, we record an allowance for credit losses to reflect the change in the estimate of the undiscounted future rents. Accordingly, the net investment balance is written down to fair value.
Notes and Mortgages Receivable	Notes and Mortgages Receivable Notes and mortgages receivable consists of loans originated by us in conjunction with property dispositions and funding provided to tenants in conjunction with property acquisitions and capital improvements. Notes and mortgages receivable are recorded at stated principal amounts. We evaluate the collectability of both interest and principal on each loan to determine whether it is impaired. A loan is considered to be impaired when, based upon current information and events, it is probable that we will be unable to collect all amounts due under the existing contractual terms. When a loan is considered to be impaired, the amount of the loss is calculated by comparing the recorded investment to the fair value determined by discounting the expected future cash flows at the loan’s effective interest rate or to the fair value of the underlying collateral, if the loan is collateralized. Interest income on performing loans is accrued as earned. Interest income on impaired loans is recognized on a cash basis. We do not provide for an additional allowance for loan losses based on the grouping of loans, as we believe that the characteristics of the loans are not sufficiently similar to allow an evaluation of these loans as a group for a possible loan loss allowance. As such, all of our loans are evaluated individually for impairment purposes. There were no impairments related to our notes and mortgages receivable during the years ended December 31, 2018 and 2017.
Cash and Cash Equivalents	Cash and Cash Equivalents We consider all highly liquid investments with a maturity of three months or less when purchased to be cash equivalents. Our cash and cash equivalents are held in the custody of financial institutions, and these balances, at times, may exceed federally insurable limits.
Restricted Cash	Restricted Cash Restricted cash consists of cash that is contractually restricted or held in escrow pursuant to various agreements with counterparties. At December 31, 2018 and 2017, restricted cash of $1,850,000 and $821,000, respectively, consisted of security deposits received from our tenants.
Revenue Recognition and Deferred Rent Receivable	Revenue Recognition and Deferred Rent Receivable On January 1, 2018, we adopted ASU 2014-09, Revenue from Contracts with Customers (Topic 606), (“Topic 606”) using the modified retrospective method applying it to any open contracts as of January 1, 2018. The new guidance provides a unified model to determine how revenue is recognized. To determine the proper amount of revenue to be recognized, we perform the following steps: (i) identify the contract with the customer, (ii) identify the performance obligations within the contract, (iii) determine the transaction price, (iv) allocate the transaction price to the performance obligations and (v) recognize revenue when (or as) a performance obligation is satisfied. Our primary source of revenue consists of revenue from rental properties and tenant reimbursements that is derived from leasing arrangements, which is specifically excluded from the standard, and thus had no material impact on our consolidated financial statements or notes to our consolidated financial statements as of December 31, 2018. We concluded that our revenue consists of rental income from leasing arrangements, which is specifically excluded from the standard, and thus had no material impact on our consolidated financial statements or notes to our consolidated financial statements as of December 31, 2018. Minimum lease payments from operating leases are recognized on a straight-line basis over the term of the leases. The cumulative difference between lease revenue recognized under this method and the contractual lease payment terms is recorded as deferred rent receivable on our consolidated balance sheets. We reserve for a portion of the recorded deferred rent receivable if circumstances indicate that a tenant will not make all of its contractual lease payments during the current lease term. We make estimates of the collectability of our accounts receivable related to revenue from rental properties. We analyze accounts receivable and historical bad debt levels, customer creditworthiness and current economic trends when evaluating the adequacy of the allowance for doubtful accounts. Additionally, with respect to tenants in bankruptcy, we estimate the expected recovery through bankruptcy claims and increase the allowance for amounts deemed uncollectible. If our assumptions regarding the collectability of accounts receivable prove incorrect, we could experience write-offs of the accounts receivable or deferred rent receivable in excess of our allowance for doubtful accounts. The present value of the difference between the fair market rent and the contractual rent for above-market and below-market leases at the time properties are acquired is amortized into revenues from rental properties over the remaining terms of the in-place leases. Lease termination fees are recognized as other income when earned upon the termination of a tenant’s lease and relinquishment of space in which we have no further obligation to the tenant. The sales of nonfinancial assets, such as real estate, are to be recognized when control of the asset transfers to the buyer, which will occur when the buyer has the ability to direct the use of or obtain substantially all of the remaining benefits from the asset. This generally occurs when the transaction closes and consideration is exchanged for control of the property.
Impairment of Long-Lived Assets	Impairment of Long-Lived Assets Assets are written down to fair value when events and circumstances indicate that the assets might be impaired and the projected undiscounted cash flows estimated to be generated by those assets are less than the carrying amount of those assets. Assets held for disposal are written down to fair value less estimated disposition costs. We recorded impairment charges aggregating $6,170,000, $9,321,000 and $12,814,000 for the years ended December 31, 2018, 2017 and 2016, respectively, in continuing and discontinued operations. Our estimated fair values, as they relate to property carrying values were primarily based upon (i) estimated sales prices from third-party offers based on signed contracts, letters of intent or indicative bids, for which we do not have access to the unobservable inputs used to determine these estimated fair values, and/or consideration of the amount that currently would be required to replace the asset, as adjusted for obsolescence (this method was used to determine $2,553,000 of the $6,170,000 in impairments recognized during the year ended December 31, 2018) and (ii) discounted cash flow models (this method was used to determine $175,000 of the $6,170,000 in impairments recognized during the year ended December 31, 2018). During the year ended December 31, 2018, we recorded $3,442,000 of the $6,170,000 in impairments recognized due to the accumulation of asset retirement costs as a result of changes in estimates associated with our estimated environmental liabilities which increased the carrying values of certain properties in excess of their fair values. The estimated fair value of real estate is based on the price that would be received from the sale of the property in an orderly transaction between market participants at the measurement date. In general, we consider multiple internal valuation techniques when measuring the fair value of a property, all of which are based on unobservable inputs and assumptions that are classified within Level 3 of the Fair Value Hierarchy. These unobservable inputs include assumed holding periods ranging up to 15 years, assumed average rent increases of 2.0% annually, income capitalized at a rate of 8.0% and cash flows discounted at a rate of 7.0%. These assessments have a direct impact on our net income because recording an impairment loss results in an immediate negative adjustment to net income. The evaluation of anticipated cash flows is highly subjective and is based in part on assumptions regarding future rental rates and operating expenses that could differ materially from actual results in future periods. Where properties held for use have been identified as having a potential for sale, additional judgments are required related to the determination as to the appropriate period over which the projected undiscounted cash flows should include the operating cash flows and the amount included as the estimated residual value. This requires significant judgment. In some cases, the results of whether impairment is indicated are sensitive to changes in assumptions input into the estimates, including the holding period until expected sale.
Deferred Gain	Deferred Gain On August 3, 2015, we terminated our unitary triple-net lease with Hanuman Business, Inc. (d/b/a “Ramoco”) and sold to Ramoco affiliates 48 of the 61 properties that had been subject to the lease. The total consideration for the 48 properties we sold to Ramoco affiliates, including a seller financing mortgage of $13,900,000, was $15,000,000. In accordance with ASC 360-20, Property, Plant and Equipment - Real Estate Sales, we evaluated the accounting for the gain on sales of these assets, noting that the buyer’s initial investment did not represent the amount required for recognition of the gain by the full accrual method. Accordingly, we recorded a deferred gain of $3,900,000 related to the Ramoco sale. The deferred gain was recorded in accounts payable and accrued liabilities on our balance sheet at December 31, 2015. On April 28, 2016, Ramoco affiliates repaid the entire seller financing mortgage and, as a result, the deferred gain was recognized in our consolidated statements of operations for the year ended December 31, 2016.
Fair Value of Financial Instruments	Fair Value of Financial Instruments All of our financial instruments are reflected in the accompanying consolidated balance sheets at amounts which, in our estimation based upon an interpretation of available market information and valuation methodologies, reasonably approximate their fair values, except those separately disclosed in the notes below. The preparation of consolidated financial statements in accordance with GAAP requires management to make estimates of fair value that affect the reported amounts of assets and liabilities and disclosure of assets and liabilities at the date of the consolidated financial statements and revenues and expenses during the period reported using a hierarchy (the “Fair Value Hierarchy”) that prioritizes the inputs to valuation techniques used to measure the fair value. The Fair Value Hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1 measurements) and the lowest priority to unobservable inputs (Level 3 measurements). The levels of the Fair Value Hierarchy are as follows: “Level 1” – inputs that reflect unadjusted quoted prices in active markets for identical assets or liabilities that we have the ability to access at the measurement date; “Level 2” – inputs other than quoted prices that are observable for the asset or liability either directly or indirectly, including inputs in markets that are not considered to be active; and “Level 3” – inputs that are unobservable. Certain types of assets and liabilities are recorded at fair value either on a recurring or non-recurring basis. Assets required or elected to be marked-to-market and reported at fair value every reporting period are valued on a recurring basis. Other assets not required to be recorded at fair value every period may be recorded at fair value if a specific provision or other impairment is recorded within the period to mark the carrying value of the asset to market as of the reporting date. Such assets are valued on a non-recurring basis.
Environmental Remediation Obligations	Environmental Remediation Obligations We record the fair value of a liability for an environmental remediation obligation as an asset and liability when there is a legal obligation associated with the retirement of a tangible long-lived asset and the liability can be reasonably estimated. Environmental remediation obligations are estimated based on the level and impact of contamination at each property. The accrued liability is the aggregate of our estimate of the fair value of cost for each component of the liability. The accrued liability is net of estimated recoveries from state UST remediation funds considering estimated recovery rates developed from prior experience with the funds. Net environmental liabilities are currently measured based on their expected future cash flows which have been adjusted for inflation and discounted to present value. We accrue for environmental liabilities that we believe are allocable to other potentially responsible parties if it becomes probable that the other parties will not pay their environmental remediation obligations.
Litigation	Litigation Legal fees related to litigation are expensed as legal services are performed. We provide for litigation accruals, including certain litigation related to environmental matters, when it is probable that a liability has been incurred and a reasonable estimate of the liability can be made. If the estimate of the liability can only be identified as a range, and no amount within the range is a better estimate than any other amount, the minimum of the range is accrued for the liability. We accrue our share of environmental litigation liabilities based on our assumptions of the ultimate allocation method and share that will be used when determining our share of responsibility.
Income Taxes	Income Taxes We and our subsidiaries file a consolidated federal income tax return. Effective January 1, 2001, we elected to qualify, and believe that we are operating so as to qualify, as a REIT for federal income tax purposes. Accordingly, we generally will not be subject to federal income tax on qualifying REIT income, provided that distributions to our stockholders equal at least the amount of our taxable income as defined under the Internal Revenue Code. We accrue for uncertain tax matters when appropriate. The accrual for uncertain tax positions is adjusted as circumstances change and as the uncertainties become more clearly defined, such as when audits are settled or exposures expire. Tax returns for the years 2015, 2016 and 2017, and tax returns which will be filed for the year ended 2018, remain open to examination by federal and state tax jurisdictions under the respective statutes of limitations.
New Accounting Pronouncements	New Accounting Pronouncements In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842) We elected the package of practical expedients and the lease and non-lease component practical expedient. We have elected to apply the transition requirements at the January 1, 2019, effective date rather than at the beginning of the earliest comparative period presented We expect to recognize operating lease liabilities and right of use assets of $22,000,000 to $32,000,000, which will be presented separately on our consolidated financial statements for the quarter ending March 31, 2019 . The lease liability and right-of-use asset are to be carried at the present value of remaining expected future lease payments. On June 16, 2016, the FASB issued ASU 2016-13, Financial Instruments – Credit Losses (Topic 326): Measurements of Credit Losses on Financial Instruments In August 2016, the FASB issued ASU 2016-15, Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments Effective January 1, 2018, we adopted ASU 2016-15. The adoption of this guidance did not have an impact on our consolidated financial statements or notes to our consolidated financial statements. On February 22, 2017, the FASB issued ASU 2017-05, Other Income – Gains and Losses from the Derecognition of Nonfinancial Assets (Subtopic 610-20), Clarifying the Scope of Asset Derecognition Guidance and Accounting for Partial Sales of Nonfinancial Assets Effective January 1, 2018, we adopted ASU 2017-05 on a modified retrospective basis. Upon adoption, we apply the guidance to prospective disposals of nonfinancial assets within the scope of Subtopic 610-20. The adoption of this guidance did not have an impact on our consolidated financial statements or notes to our consolidated financial statements. In August 2018, the Securities and Exchange Commission (“SEC”) adopted amendments to update and simplify disclosure requirements as well as eliminate outdated, superseded and/or redundant requirements with GAAP. The amendments are effective for all SEC filings made on or after November 5, 2018. The amendments removed certain SEC guidance that conflicted with GAAP guidance, under which we previously followed SEC guidance and recorded Gain/(loss) on dispositions of real estate, after Operating income. We have reclassified Gain/(loss) on dispositions of real estate within Operating income, per GAAP for all periods presented.

Leases (Tables)

Leases (Tables)	12 Months Ended
	Dec. 31, 2018
Leases [Abstract]
Future Contractual Minimum Annual Rentals Receivable	Future contractual minimum annual rentals receivable from our tenants, which have terms in excess of one year as of December 31, 2018, are as follows (in thousands): Year Ending December 31, Operating Leases Direct Financing Leases Total 2019 $ 102,928 $ 12,864 $ 115,792 2020 102,693 13,156 115,849 2021 99,593 13,339 112,932 2022 99,184 13,420 112,604 2023 99,223 13,467 112,690 Thereafter $ 678,106 $ 73,030 $ 751,136

Debt (Tables)

Debt (Tables)	12 Months Ended
	Dec. 31, 2018
Debt Disclosure [Abstract]
Schedule of Maturity Amounts Outstanding Under Credit Agreement, Third Restated Prudential Note Purchase Agreement	The amounts outstanding under our Restated Credit Agreement, Third Restated Prudential Note Purchase Agreement and MetLife Note Purchase Agreement (as defined below) are as follows (in thousands): Maturity Date Interest Rate December 31, 2018 December 31, 2017 Unsecured Revolving Credit Facility March 2022 3.95 % $ 70,000 $ 105,000 Unsecured Term Loan March 2023 3.96 % 50,000 50,000 Series A Notes February 2021 6.00 % 100,000 100,000 Series B Notes June 2023 5.35 % 75,000 75,000 Series C Notes February 2025 4.75 % 50,000 50,000 Series D Notes June 2028 5.47 % 50,000 — Series E Notes June 2028 5.47 % 50,000 — Total debt 445,000 380,000 Unamortized debt issuance costs, net (3,364 ) (842 ) Total debt, net $ 441,636 $ 379,158
Summary of Scheduled Debt Maturities, Including Balloon Payments	As of December 31, 2018, scheduled debt maturities, including balloon payments, are as follows (in thousands): Revolving Facility Term Loan Senior Unsecured Notes Total 2019 $ — $ — $ — $ - 2020 — — — — 2021 — — 100,000 100,000 2022 (1) 70,000 — — 70,000 2023 — 50,000 75,000 125,000 Thereafter — — 150,000 150,000 Total $ 70,000 $ 50,000 $ 325,000 $ 445,000 (1) The Revolving Facility matures in March 2022. Subject to the terms of the Restated Credit Agreement and our continued compliance with its provisions, we have the option to extend the term of the Revolving Facility for one additional year to March 2023.

Stockholders' Equity (Tables)

Stockholders' Equity (Tables)	12 Months Ended
	Dec. 31, 2018
Equity [Abstract]
Summary of Changes in Stockholders' Equity	A summary of the changes in stockholders’ equity for the years ended December 31, 2018, 2017 and 2016, is as follows (in thousands except per share amounts): Common Stock Additional Paid-in Dividends Paid in Excess Shares Amount Capital of Earnings Total BALANCE, DECEMBER 31, 2015 33,422 $ 334 $ 464,338 $ (58,111 ) $ 406,561 Net earnings 38,411 38,411 Dividends declared — $1.03 per share (35,385 ) (35,385 ) Shares issued pursuant to ATM Program, net 653 7 14,879 14,886 Shares issued pursuant to stock dividends 256 3 4,409 4,412 Shares issued pursuant to dividend reinvestment 43 — 897 897 Stock-based compensation and settlements 19 — 1,136 — 1,136 BALANCE, DECEMBER 31, 2016 34,393 $ 344 $ 485,659 $ (55,085 ) $ 430,918 Net earnings 47,186 47,186 Dividends declared — $1.16 per share (43,675 ) (43,675 ) Shares issued pursuant to Equity Offering, net 4,715 47 104,265 — 104,312 Shares issued pursuant to ATM Program, net 513 5 13,523 — 13,528 Shares issued pursuant to dividend reinvestment 48 1 1,270 — 1,271 Stock-based compensation and settlements 27 — 155 — 155 BALANCE, DECEMBER 31, 2017 39,696 $ 397 $ 604,872 $ (51,574 ) $ 553,695 Net earnings 47,706 47,706 Dividends declared — $1.31 per share (53,555 ) (53,555 ) Shares issued pursuant to ATM Program, net 1,106 11 30,127 — 30,138 Shares issued pursuant to dividend reinvestment 52 1 1,402 — 1,403 Stock-based compensation and settlements 1 — 1,777 — 1,777 BALANCE, DECEMBER 31, 2018 40,855 $ 409 $ 638,178 $ (57,423 ) $ 581,164

Employee Benefit Plans (Tables)

Employee Benefit Plans (Tables)	12 Months Ended
	Dec. 31, 2018
Postemployment Benefits [Abstract]
Schedule of Activity Relating to Restricted Stock Units Outstanding	The following is a schedule of the activity relating to RSUs outstanding: Number of Fair Value RSUs Outstanding Amount Average Per RSU RSUs OUTSTANDING AT DECEMBER 31, 2015 400,375 Granted 86,600 $ 1,593,400 $ 18.40 Settled (34,650 ) 635,800 18.35 Cancelled (22,550 ) $ 415,400 $ 18.42 RSUs OUTSTANDING AT DECEMBER 31, 2016 429,775 Granted 94,250 $ 2,484,400 $ 26.36 Settled (51,770 ) 1,306,300 25.23 Cancelled (23,330 ) $ 587,100 $ 25.17 RSUs OUTSTANDING AT DECEMBER 31, 2017 448,925 Granted 124,650 $ 3,106,400 $ 24.92 Settled — — — Cancelled — $ — $ — RSUs OUTSTANDING AT DECEMBER 31, 2018 573,575
Schedule of Vesting Activity Relating to Restricted Stock Units Outstanding	The following is a schedule of the vesting activity relating to RSUs outstanding: Number of RSUs Vested Fair Value RSUs VESTED AT DECEMBER 31, 2015 202,344 Vested 54,125 $ 1,379,600 Settled (34,650 ) $ 635,800 RSUs VESTED AT DECEMBER 31, 2016 221,819 Vested 55,336 $ 1,502,900 Settled (51,770 ) $ 1,306,300 RSUs VESTED AT DECEMBER 31, 2017 225,385 Vested 63,635 $ 1,871,500 Settled — $ — RSUs VESTED AT DECEMBER 31, 2018 289,020

Earnings Per Common Share (Tabl

Earnings Per Common Share (Tables)	12 Months Ended
	Dec. 31, 2018
Earnings Per Share [Abstract]
Computation of Basic and Diluted Earnings Per Common Share	The following table is a reconciliation of the numerator and denominator used in the computation of basic and diluted earnings per common share using the two-class method (in thousands except per share data): Year ended December 31, (in thousands): 2018 2017 2016 Earnings from continuing operations $ 48,410 $ 45,048 $ 39,825 Less dividend equivalents attributable to RSUs outstanding (751 ) (567 ) (482 ) Earnings from continuing operations attributable to common stockholders 47,659 44,481 39,343 Earnings (loss) from discontinued operations (704 ) 2,138 (1,414 ) Less dividend equivalents attributable to RSUs outstanding — — — Earnings (loss) from discontinued operations attributable to common stockholders (704 ) 2,138 (1,414 ) Net earnings attributable to common stockholders used for basic and diluted earnings per share calculation $ 46,955 $ 46,619 $ 37,929 Weighted average common shares outstanding: Basic 40,171 36,897 33,806 Incremental shares from stock-based compensation 20 — — Diluted 40,191 36,897 33,806 Basic earnings per common share $ 1.17 $ 1.26 $ 1.12 Diluted earnings per common share $ 1.17 $ 1.26 $ 1.12

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	12 Months Ended
	Dec. 31, 2018
Fair Value Disclosures [Abstract]
Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis	The following summarizes as of December 31, 2018, our assets and liabilities measured at fair value on a recurring basis by level within the Fair Value Hierarchy (in thousands): Level 1 Level 2 Level 3 Total Assets: Mutual funds $ 534 $ — $ — $ 534 Liabilities: Deferred compensation $ — $ 534 $ — $ 534 The following summarizes as of December 31, 2017, our assets and liabilities measured at fair value on a recurring basis by level within the Fair Value Hierarchy (in thousands): Level 1 Level 2 Level 3 Total Assets: Mutual funds $ 451 $ — $ — $ 451 Liabilities: Deferred compensation $ — $ 451 $ — $ 451

Discontinued Operations and A_2

Discontinued Operations and Assets Held For Sale (Tables)	12 Months Ended
	Dec. 31, 2018
Discontinued Operations And Disposal Groups [Abstract]
Schedule of Activity From Discontinued Operations	Activity from discontinued operations was as follows (in thousands): Year ended December 31, 2018 2017 2016 Total revenues $ — $ — $ — Impairments (1,268 ) (1,042 ) (4,248 ) Changes in environmental estimates 564 3,169 3,010 Other operating income — 11 2 Earnings (loss) from operating activities (704 ) 2,138 (1,236 ) (Loss) gains from dispositions of real estate — — (178 ) Earnings (loss) from discontinued operations $ (704 ) $ 2,138 $ (1,414 )

Quarterly Financial Data (Table

Quarterly Financial Data (Tables)	12 Months Ended
	Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]
Summary of Quarterly Results of Operations	The following is a summary of the quarterly results of operations for the years ended December 31, 2018 and 2017 (unaudited as to quarterly information) (in thousands, except per share amounts): Three Months Ended Year Ended December 31, 2018 March 31, June 30, September 30, December 31, Revenues from rental properties $ 28,284 $ 29,022 $ 29,570 $ 29,452 Earnings from continuing operations 10,162 13,823 11,017 13,408 Net earnings $ 10,032 $ 13,540 $ 10,944 $ 13,190 Diluted earnings per common share: Earnings from continuing operations $ 0.25 $ 0.34 $ 0.27 $ 0.33 Net earnings $ 0.25 $ 0.33 $ 0.27 $ 0.32 Year Ended December 31, 2017 March 31, June 30, September 30, December 31, Revenues from rental properties $ 23,897 $ 24,364 $ 24,913 $ 28,158 Earnings from continuing operations 7,716 14,551 9,460 13,321 Net earnings $ 9,704 $ 15,106 $ 9,340 $ 13,036 Diluted earnings per common share: Earnings from continuing operations $ 0.22 $ 0.41 $ 0.24 $ 0.33 Net earnings $ 0.28 $ 0.43 $ 0.24 $ 0.33

Acquired Intangible Assets (Tab

Acquired Intangible Assets (Tables)	12 Months Ended
	Dec. 31, 2018
Goodwill And Intangible Assets Disclosure [Abstract]
Schedule of Amortization for Acquired Intangible Assets	The amortization for acquired intangible assets during the next five years and thereafter, assuming no early lease terminations, is as follows: As Lessor: Above-Market Leases Below-Market Leases In-Place Leases Year ending December 31, 2019 $ 158,000 $ 2,142,000 $ 2,994,000 2020 152,000 1,736,000 2,973,000 2021 144,000 1,562,000 2,954,000 2022 135,000 1,484,000 2,942,000 2023 135,000 1,393,000 2,940,000 Thereafter 1,330,000 13,197,000 23,739,000 $ 2,054,000 $ 21,514,000 $ 38,542,000 As Lessee: Below-Market Leases Year ending December 31, 2019 $ 312,000 2020 222,000 2021 157,000 2022 127,000 2023 126,000 Thereafter 502,000 $ 1,446,000

Summary of Significant Accoun_3

Summary of Significant Accounting Policies - Additional Information (Detail)

Aug. 03, 2015USD ($)

Dec. 31, 2018USD ($)

Sep. 30, 2018USD ($)

Jun. 30, 2018USD ($)

Mar. 31, 2018USD ($)

Dec. 31, 2017USD ($)

Sep. 30, 2017USD ($)

Jun. 30, 2017USD ($)

Mar. 31, 2017USD ($)

Dec. 31, 2018USD ($)PropertyTenant

Dec. 31, 2017USD ($)

Dec. 31, 2016USD ($)

Mar. 31, 2019USD ($)

Dec. 31, 2015USD ($)

Organization Consolidation And Presentation Of Financial Statements [Line Items]

Impairments

$ 4,902,000

$ 8,279,000

$ 8,566,000

Maturity period of liquid investments

3 months

Restricted cash

$ 1,850,000

$ 821,000

$ 1,850,000

821,000

Gain on property condemnations

60,000

16,000

Impairment charges

6,170,000

9,321,000

12,814,000

Revenues from rental properties

$ 15,000,000

$ 29,452,000

$ 29,570,000

$ 29,022,000

$ 28,284,000

28,158,000

$ 24,913,000

$ 24,364,000

$ 23,897,000

$ 116,328,000

101,332,000

$ 96,711,000

Accounting Standards Update 2016-02 [Member] | Scenario Forecast [Member]

Organization Consolidation And Presentation Of Financial Statements [Line Items]

operating lease liabilities

$ 22,000,000

Operating lease right of use assets

$ 32,000,000

Ramoco Affiliates [Member]

Organization Consolidation And Presentation Of Financial Statements [Line Items]

Number of properties sold to Ramoco affiliates that were previously included in the Ramoco lease | Tenant

48

Number of leased properties | Property

61

Ramoco Affiliates [Member] | Accounts Payable and Accrued Liabilities [Member]

Organization Consolidation And Presentation Of Financial Statements [Line Items]

Deferred gain on sale of property

$ 3,900,000

Seller Financing Mortgage [Member]

Organization Consolidation And Presentation Of Financial Statements [Line Items]

Revenues from rental properties

$ 13,900,000

Level 3 [Member]

Organization Consolidation And Presentation Of Financial Statements [Line Items]

Assumed annual average rent increases for unobservable inputs

2.00%

Level 3 [Member] | Measurement Input Cap Rate [Member]

Organization Consolidation And Presentation Of Financial Statements [Line Items]

Real estate fair value, measurement input

8.00%

8.00%

Level 3 [Member] | Measurement Input Discount Rate [Member]

Organization Consolidation And Presentation Of Financial Statements [Line Items]

Real estate fair value, measurement input

7.00%

7.00%

Estimated Sale Price Method [Member]

Organization Consolidation And Presentation Of Financial Statements [Line Items]

Impairment charges

$ 6,170,000

Estimated fair value

2,553,000

2,553,000

Discounted Cash Flow Method [Member]

Organization Consolidation And Presentation Of Financial Statements [Line Items]

Impairment charges

6,170,000

Estimated fair value

175,000

175,000

Accumulation of Asset Retirement Cost Method [Member]

Organization Consolidation And Presentation Of Financial Statements [Line Items]

Impairment charges

6,170,000

Estimated fair value

$ 3,442,000

3,442,000

Notes and Mortgages Receivable [Member]

Organization Consolidation And Presentation Of Financial Statements [Line Items]

Impairments

0

0

Direct Financing Leases Financing Receivable [Member]

Organization Consolidation And Presentation Of Financial Statements [Line Items]

Impairments

$ 0

$ 0

Maximum [Member] | Level 3 [Member] | Measurement Input Expected Term [Member]

Organization Consolidation And Presentation Of Financial Statements [Line Items]

Assumed holding periods for unobservable inputs

15 years

Buildings and Improvements [Member] | Minimum [Member]

Organization Consolidation And Presentation Of Financial Statements [Line Items]

Property plant and equipment useful life

16 years

Buildings and Improvements [Member] | Maximum [Member]

Organization Consolidation And Presentation Of Financial Statements [Line Items]

Property plant and equipment useful life

25 years

USTs [Member]

Organization Consolidation And Presentation Of Financial Statements [Line Items]

Property plant and equipment useful life

10 years

Leases - Additional Information

Leases - Additional Information (Detail)	Aug. 03, 2015USD ($)	Dec. 31, 2018USD ($)PropertyState	Sep. 30, 2018USD ($)	Jun. 30, 2018USD ($)	Mar. 31, 2018USD ($)	Dec. 31, 2017USD ($)	Sep. 30, 2017USD ($)	Jun. 30, 2017USD ($)	Mar. 31, 2017USD ($)	Dec. 31, 2018USD ($)PropertyState	Dec. 31, 2017USD ($)	Dec. 31, 2016USD ($)
Leases [Line Items]
Number of properties in portfolio | Property		933								933
Number of states in which our properties are located | State		30								30
Revenues from rental properties	$ 15,000,000	$ 29,452,000	$ 29,570,000	$ 29,022,000	$ 28,284,000	$ 28,158,000	$ 24,913,000	$ 24,364,000	$ 23,897,000	$ 116,328,000	$ 101,332,000	$ 96,711,000
Rental income contractually due from tenants in revenues from rental properties included in continuing operations										114,105,000	99,355,000	93,294,000
Revenue recognition adjustments included in revenues from rental properties in continuing operations										2,223,000	1,976,000	3,417,000
Deferred rent receivables reserves		0				0				0	0
Real Estate Taxes and other municipal charges paid then reimbursed by tenants included in revenues and expenses										16,691,000	15,829,000	15,017,000
Lease origination costs		579,000				126,000				579,000	126,000	148,000
Net investment in direct financing leases		85,892,000				89,587,000				85,892,000	89,587,000
Net Investments in direct financing lease, minimum lease payments receivable		139,276,000				154,441,000				139,276,000	154,441,000
Net Investment in direct financing lease, unguaranteed estimated residual value		13,928,000				13,979,000				13,928,000	13,979,000
Net Investment in direct financing lease, deferred income		67,312,000				$ 78,833,000				$ 67,312,000	78,833,000
Remaining lease term										9 years
2,019		6,016,000								$ 6,016,000
2,020		5,284,000								5,284,000
2,021		4,371,000								4,371,000
2,022		2,766,000								2,766,000
2,023		2,021,000								2,021,000
Thereafter		$ 2,754,000								2,754,000
Rent expense on operating lease										4,660,000	5,091,000	5,376,000
Rent received under sublease										$ 9,023,000	$ 9,296,000	$ 9,153,000
Third Party Landlords [Member]
Leases [Line Items]
Number of properties leased | Property		74								74
Owned Properties [Member]
Leases [Line Items]
Number of properties | Property		859								859

Leases - Future Contractual Min

Leases - Future Contractual Minimum Annual Rentals Receivable (Detail) $ in Thousands	Dec. 31, 2018USD ($)
Future Minimum Lease Payments For Capital Leases And Operating Leases [Abstract]
2,019	$ 102,928
2,020	102,693
2,021	99,593
2,022	99,184
2,023	99,223
Thereafter	678,106
2,019	12,864
2,020	13,156
2,021	13,339
2,022	13,420
2,023	13,467
Thereafter	73,030
2,019	115,792
2,020	115,849
2,021	112,932
2,022	112,604
2,023	112,690
Thereafter	$ 751,136

Leases - Major Tenants - Additi

Leases - Major Tenants - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2018PropertyTenantLease	Dec. 31, 2017
Leases [Line Items]
Number of significant tenants | Tenant	3
Subsidiaries of Global Partners LP (NYSE GLP) [Member]
Leases [Line Items]
Number of leased properties | Property	157
Number of unitary leases guaranteed by the parent	3
Subsidiaries of Global Partners LP (NYSE GLP) [Member] | Sales Revenue, Net [Member] | Customer Concentration Risk [Member]
Leases [Line Items]
Lease revenue percentage	17.00%	21.00%
Apro, LLC (d/b/a United Oil) [Member]
Leases [Line Items]
Number of leased properties | Property	77
Number Of Unitary Leases To Tenant	3
Apro, LLC (d/b/a United Oil) [Member] | Sales Revenue, Net [Member] | Customer Concentration Risk [Member]
Leases [Line Items]
Lease revenue percentage	13.00%	15.00%
Subsidiaries of Chestnut Petroleum Dist. Inc.[Member]
Leases [Line Items]
Number of leased properties | Property	76
Number of unitary leases	2
Subsidiaries of Chestnut Petroleum Dist. Inc.[Member] | Sales Revenue, Net [Member] | Customer Concentration Risk [Member]
Leases [Line Items]
Lease revenue percentage	11.00%	13.00%
Number of leased properties guaranteed	57

Leases - Getty Petroleum Market

Leases - Getty Petroleum Marketing Inc. - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2018USD ($)PropertyPortfolio
Leases [Line Items]
Number of leased properties subject to long-term triple-net leases | Property	331
Number of long-term triple-net leases during the period | Portfolio	14
Number of leased properties as single unit triple net leases | Portfolio	30
Maximum lease commitment for capital expenditure	$ 7,621,000
Unitary triple-net lease agreements initial terms	15 years
USTs [Member]
Leases [Line Items]
Asset retirement obligations removed from balance sheet	$ 13,813,000
Net asset retirement costs related to USTs removed from balance sheet	10,808,000
Deferred rental revenue	1,754,000
Deferred rental revenue accumulated amortization	$ 1,251,000
Maximum [Member]
Leases [Line Items]
Unitary triple-net lease agreements successive terms	20 years
Getty Petroleum Marketing Inc [Member]
Leases [Line Items]
Number of properties previously leased | Property	374

Commitments and Contingencies -

Commitments and Contingencies - Additional Information (Detail)

Dec. 17, 2017Defendant

Apr. 19, 2017USD ($)Party

Oct. 05, 2016

Jun. 16, 2016USD ($)

Mar. 04, 2016USD ($)

Jul. 07, 2014Defendant

May 31, 2007Defendant

Jun. 30, 2018Defendant

Dec. 31, 2018USD ($)Defendant

Dec. 31, 2017USD ($)

Dec. 31, 2015USD ($)

Jan. 31, 2018USD ($)Party

Mar. 30, 2017Party

Sep. 30, 2003Party

Loss Contingencies [Line Items]

Accrued legal matters

$ 12,231,000

$ 12,311,000

Credits for environmental litigation accruals

(45,000)

Provisions for environmental litigation accruals

1,044,000

Legal litigation settlements

$ 147,000

$ 6,381,000

Bankruptcy files claim amount

$ 14,300,000

Number of released parties | Party

59

Occidental Chemical Corporation [Member] | EPA [Member]

Loss Contingencies [Line Items]

Number of potentially responsible parties | Party

20

Remedial design performance period under EPA settlement agreement

4 years

Number of potentially responsible parties that the EPA intends to enter into a final settlement agreement with | Party

15

Remediation cost for identified responsible parties

$ 280,600

8 Mile Stretch of Lower Passaic River [Member]

Loss Contingencies [Line Items]

Cost estimate for remediating Lower Passaic River

$ 1,380,000,000

Minimum [Member] | Occidental Chemical Corporation [Member] | CERCLA [Member]

Loss Contingencies [Line Items]

Number of defendants under complaint | Defendant

120

Minimum [Member] | 17 Mile Stretch of Lower Passaic River [Member]

Loss Contingencies [Line Items]

Cost estimate for remediating Lower Passaic River

$ 483,000,000

Maximum [Member] | 17 Mile Stretch of Lower Passaic River [Member]

Loss Contingencies [Line Items]

Cost estimate for remediating Lower Passaic River

$ 725,000,000

Lower Passaic River [Member]

Loss Contingencies [Line Items]

Number of potentially responsible parties | Party

66

Lower Passaic River [Member] | YPF [Member]

Loss Contingencies [Line Items]

Payment of bankruptcy amount

$ 130,000,000

Lower Passaic River [Member] | Minimum [Member] | 17 Mile Stretch of Lower Passaic River [Member]

Loss Contingencies [Line Items]

Parties to perform a remedial investigation and feasibility study | Defendant

70

MTBE [Member] | NJ [Member]

Loss Contingencies [Line Items]

Number of defendants in the MTBE complaint | Defendant

50

MTBE [Member] | Minimum [Member] | PA [Member]

Loss Contingencies [Line Items]

Number of defendants in the MTBE complaint | Defendant

50

MTBE [Member] | Minimum [Member] | MARYLAND [Member]

Loss Contingencies [Line Items]

Number of defendants in the MTBE complaint | Defendant

60

Debt - Schedule of Maturity Amo

Debt - Schedule of Maturity Amounts Outstanding Under Credit Agreement , Third Restated Prudential Note Purchase Agreement (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Line of Credit Facility [Line Items]
Borrowings under credit agreement, outstanding amount	$ 117,227	$ 154,502
Borrowings under note purchase and guarantee agreement, outstanding amount	324,409	224,656
Total	445,000	380,000
Unamortized debt issuance costs, net	(3,364)	(842)
Total debt, net	$ 441,636	$ 379,158
Revolving Facility [Member]
Line of Credit Facility [Line Items]
Maturity Date	Mar. 23, 2022	Mar. 23, 2022
Interest Rate	3.95%	3.95%
Borrowings under credit agreement, outstanding amount	$ 70,000	$ 105,000
Total	$ 70,000
Term Loan [Member]
Line of Credit Facility [Line Items]
Maturity Date	Mar. 23, 2023	Mar. 23, 2023
Interest Rate	3.96%	3.96%
Borrowings under credit agreement, outstanding amount	$ 50,000	$ 50,000
Total	$ 50,000
Series A Notes Maturing in February 2021 [Member]
Line of Credit Facility [Line Items]
Maturity Date	Feb. 28, 2021	Feb. 28, 2021
Interest Rate	6.00%	6.00%
Borrowings under note purchase and guarantee agreement, outstanding amount	$ 100,000	$ 100,000
Series B Notes Maturing in June 2023 [Member]
Line of Credit Facility [Line Items]
Maturity Date	Jun. 30, 2023	Jun. 30, 2023
Interest Rate	5.35%	5.35%
Borrowings under note purchase and guarantee agreement, outstanding amount	$ 75,000	$ 75,000
Series C Notes Maturing in February 2025 [Member]
Line of Credit Facility [Line Items]
Maturity Date	Feb. 28, 2025	Feb. 28, 2025
Interest Rate	4.75%	4.75%
Borrowings under note purchase and guarantee agreement, outstanding amount	$ 50,000	$ 50,000
Series D Notes Maturing in June 2028 [Member]
Line of Credit Facility [Line Items]
Maturity Date	Jun. 21, 2028	Jun. 21, 2028
Interest Rate	5.47%	5.47%
Borrowings under note purchase and guarantee agreement, outstanding amount	$ 50,000
Series E Notes Maturing in June 2028 [Member]
Line of Credit Facility [Line Items]
Maturity Date	Jun. 21, 2028	Jun. 21, 2028
Interest Rate	5.47%	5.47%
Borrowings under note purchase and guarantee agreement, outstanding amount	$ 50,000

Debt - Additional Information (

Debt - Additional Information (Detail) - USD ($)	Mar. 23, 2018	Jun. 02, 2015	Dec. 31, 2018	Dec. 31, 2017
Credit and Loan Agreement [Line Items]
Credit agreement initiation date		Jun. 2, 2015
Senior unsecured revolving credit agreement		$ 225,000,000
Term loan under credit agreement		50,000,000
Third Restated Prudential Note Purchase Agreement [Member]
Credit and Loan Agreement [Line Items]
Senior unsecured note, issuance date			Jun. 21, 2018
Amount of rate increase in case of default			2.00%
Third Restated Prudential Note Purchase Agreement [Member] | Series A Note [Member]
Credit and Loan Agreement [Line Items]
Senior unsecured note purchase agreement, maturity date			Feb. 25, 2021
Interest rate on agreement			6.00%
Senior unsecured note, aggregate amount issued			$ 100,000,000
Third Restated Prudential Note Purchase Agreement [Member] | Series B Notes [Member]
Credit and Loan Agreement [Line Items]
Senior unsecured note purchase agreement, maturity date			Jun. 2, 2023
Interest rate on agreement			5.35%
Senior unsecured note, aggregate amount issued			$ 75,000,000
Third Restated Prudential Note Purchase Agreement [Member] | Series C Notes [Member]
Credit and Loan Agreement [Line Items]
Senior unsecured note purchase agreement, maturity date			Feb. 25, 2025
Interest rate on agreement			4.75%
Senior unsecured note, aggregate amount issued			$ 50,000,000
Third Restated Prudential Note Purchase Agreement [Member] | Series D Notes [Member]
Credit and Loan Agreement [Line Items]
Senior unsecured note purchase agreement, maturity date			Jun. 21, 2028
Interest rate on agreement			5.47%
Senior unsecured note, aggregate amount issued			$ 50,000,000
Third Restated Prudential Note Purchase Agreement [Member] | Series E Notes [Member]
Credit and Loan Agreement [Line Items]
Senior unsecured note purchase agreement, maturity date			Jun. 21, 2018
Interest rate on agreement			5.47%
Senior unsecured note, aggregate amount issued			$ 50,000,000
Revolving Facility [Member]
Credit and Loan Agreement [Line Items]
Revolving facility under credit agreement	$ 175,000,000	$ 175,000,000
Credit facility amount	$ 250,000,000
Credit agreement maturity date	Jun. 30, 2018
Credit agreement extended maturity date	Mar. 23, 2022
Revolving facility optional extension period			1 year
Credit facility agreement, optional extended maturity date			Mar. 31, 2023
Senior unsecured note purchase agreement, maturity date			Mar. 23, 2022	Mar. 23, 2022
Interest rate on agreement			3.95%	3.95%
Revolving Facility [Member] | Maximum [Member]
Credit and Loan Agreement [Line Items]
Option to increase credit facility			$ 300,000,000
Annual commitment fee on undrawn funds			0.25%
Revolving Facility [Member] | Maximum [Member] | Base Rate [Member]
Credit and Loan Agreement [Line Items]
Credit agreement margin on borrowing base rate			1.30%
Revolving Facility [Member] | Maximum [Member] | LIBOR [Member]
Credit and Loan Agreement [Line Items]
Credit agreement margin on borrowing base rate			2.30%
Revolving Facility [Member] | Minimum [Member]
Credit and Loan Agreement [Line Items]
Annual commitment fee on undrawn funds			0.15%
Revolving Facility [Member] | Minimum [Member] | Base Rate [Member]
Credit and Loan Agreement [Line Items]
Credit agreement margin on borrowing base rate			0.50%
Revolving Facility [Member] | Minimum [Member] | LIBOR [Member]
Credit and Loan Agreement [Line Items]
Credit agreement margin on borrowing base rate			1.50%
Term Loan [Member]
Credit and Loan Agreement [Line Items]
Credit facility amount			$ 600,000,000
Credit agreement maturity date	Jun. 30, 2020
Credit agreement extended maturity date	Mar. 23, 2023
Senior unsecured note purchase agreement, maturity date			Mar. 23, 2023	Mar. 23, 2023
Interest rate on agreement			3.96%	3.96%
Term Loan [Member] | Maximum [Member] | Base Rate [Member]
Credit and Loan Agreement [Line Items]
Credit agreement margin on borrowing base rate			1.25%
Term Loan [Member] | Maximum [Member] | LIBOR [Member]
Credit and Loan Agreement [Line Items]
Credit agreement margin on borrowing base rate			2.25%
Term Loan [Member] | Minimum [Member] | Base Rate [Member]
Credit and Loan Agreement [Line Items]
Credit agreement margin on borrowing base rate			0.45%
Term Loan [Member] | Minimum [Member] | LIBOR [Member]
Credit and Loan Agreement [Line Items]
Credit agreement margin on borrowing base rate			1.45%

Debt - Summary of Scheduled Deb

Debt - Summary of Scheduled Debt Maturities, Including Balloon Payments (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
2,019	$ 0
2,020	0
2,021	100,000
2,022	70,000
2,023	125,000
Thereafter	150,000
Total	445,000	$ 380,000
Revolving Facility [Member]
Debt Instrument [Line Items]
2,019	0
2,020	0
2,021	0
2,022	70,000
2,023	0
Thereafter	0
Total	70,000
Term Loan [Member]
Debt Instrument [Line Items]
2,019	0
2,020	0
2,021	0
2,022	0
2,023	50,000
Thereafter	0
Total	50,000
Senior Unsecured Notes [Member]
Debt Instrument [Line Items]
2,019	0
2,020	0
2,021	100,000
2,022	0
2,023	75,000
Thereafter	150,000
Total	$ 325,000

Debt - Summary of Scheduled D_2

Debt - Summary of Scheduled Debt Maturities, Including Balloon Payments (Parenthetical) (Detail) - Revolving Facility [Member]	12 Months Ended
	Dec. 31, 2018
Debt Instrument [Line Items]
Credit facility agreement, maturity date	Mar. 23, 2022
Revolving facility optional extension period	1 year
Credit facility agreement, optional extended maturity date	Mar. 31, 2023

Environmental Obligations - Add

Environmental Obligations - Additional Information (Detail) - USD ($)	1 Months Ended	12 Months Ended
	Jul. 31, 2012	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Other Commitments [Line Items]
Pollution legal liability insurance policy duration	10 years
Pollution legal liability insurance policy aggregate limit	$ 50,000,000
Remediation agreement of lease		We have agreed to be responsible for environmental contamination at the premises that was known at the time the lease commenced, and for environmental contamination discovered (other than as a result of a voluntary site investigation) during the first 10 years of the lease term (or a shorter period for a minority of such leases).
The maximum number of years during lease term during which contamination is discovered that the Company may be responsible for		10 years
Estimated maximum remaining useful life of underground storage tanks that the company may be responsible for sold properties		5 years
Environmental remediation obligations		$ 59,821,000	$ 63,565,000
Accretion expense		2,409,000	3,448,000	$ 4,107,000
Amounts of credits to environmental expenses included in continuing and discontinued operations		1,319,000	6,854,000	7,007,000
Increase in carrying value of property		$ 5,111,000	5,477,000
Estimated maximum remaining useful life of underground storage tanks used to calculate depreciation of capitalized asset retirement costs		10 years
Depreciation and amortization expense for capitalized asset retirement costs		$ 4,255,000	4,347,000	5,126,000
Capitalized asset retirement costs		45,659,000	45,380,000
Impairments		4,902,000	8,279,000	$ 8,566,000
Continuing and Discontinued Operations for Capitalized Asset Retirement Costs [Member]
Other Commitments [Line Items]
Impairments		3,850,000	6,932,000
Reasonably Estimable Environmental Remediation Obligation [Member]
Other Commitments [Line Items]
Environmental remediation obligations		14,477,000	18,537,000
Future Environmental Liabilities for Preexisting Unknown Contamination [Member]
Other Commitments [Line Items]
Environmental remediation obligations		45,344,000	45,028,000
Capitalized asset retirement costs		25,311,000	26,688,000
Known Environmental Liabilities [Member]
Other Commitments [Line Items]
Capitalized asset retirement costs		$ 20,348,000	$ 18,692,000
Maximum [Member]
Other Commitments [Line Items]
The maximum number of years during lease term during which contamination is discovered that the Company may be responsible for		10 years
Environmental remediation liabilities discount rate		7.00%
Environmental remediation liability inflation rate adjustment		2.75%
Minimum [Member]
Other Commitments [Line Items]
Environmental remediation liabilities discount rate		4.00%
Environmental remediation liability inflation rate adjustment		2.00%

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Income taxes	$ 244	$ (195)	$ 368
Percentage of ordinary income	89.20%	100.00%	61.60%
Capital gain distributions percentage	10.80%	0.00%	34.40%
Non-taxable distributions percentage	0.00%	0.00%	4.00%
Percentage of taxable income distributed among stockholders	90.00%

Stockholders' Equity - Summary

Stockholders' Equity - Summary of Changes in Stockholders' Equity (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Shareholders Equity [Line Items]
Beginning balance, value				$ 553,695				$ 430,918	$ 553,695	$ 430,918	$ 406,561
Net earnings	$ 13,190	$ 10,944	$ 13,540	10,032	$ 13,036	$ 9,340	$ 15,106	9,704	47,706	47,186	38,411
Dividends declared									(53,555)	(43,675)	(35,385)
Shares issued pursuant to stock dividends, value											4,412
Shares issued pursuant to dividend reinvestment, value									1,403	1,271	897
Stock-based compensation and settlements, value									1,777	155	1,136
Ending balance, value	581,164				553,695				581,164	553,695	430,918
Equity Offering [Member]
Shareholders Equity [Line Items]
Shares issued pursuant to Offering/Program net, value										104,312
ATM Program [Member]
Shareholders Equity [Line Items]
Shares issued pursuant to Offering/Program net, value									30,138	13,528	14,886
Common Stock [Member]
Shareholders Equity [Line Items]
Beginning balance, value				$ 397				$ 344	$ 397	$ 344	$ 334
Beginning balance, shares				39,696,000				34,393,000	39,696,000	34,393,000	33,422,000
Shares issued pursuant to stock dividends, value											$ 3
Shares issued pursuant to stock dividends, shares											256,000
Shares issued pursuant to dividend reinvestment, value									$ 1	$ 1
Shares issued pursuant to dividend reinvestment, shares									51,920	47,922	43,000
Stock-based compensation and settlements, value									$ 1	$ 27	$ 19
Ending balance, value	$ 409				$ 397				$ 409	$ 397	$ 344
Ending balance, share	40,855,000				39,696,000				40,855,000	39,696,000	34,393,000
Common Stock [Member] | Equity Offering [Member]
Shareholders Equity [Line Items]
Shares issued pursuant to Offering/Program net, value										$ 47
Shares issued pursuant to Offering/Program net, shares										4,715,000
Common Stock [Member] | ATM Program [Member]
Shareholders Equity [Line Items]
Shares issued pursuant to Offering/Program net, value									$ 11	$ 5	$ 7
Shares issued pursuant to Offering/Program net, shares									1,106,000	513,000	653,000
Additional Paid-in-Capital [Member]
Shareholders Equity [Line Items]
Beginning balance, value				$ 604,872				$ 485,659	$ 604,872	$ 485,659	$ 464,338
Shares issued pursuant to stock dividends, value											4,409
Shares issued pursuant to dividend reinvestment, value									1,402	1,270	897
Stock-based compensation and settlements, value									1,777	155	1,136
Ending balance, value	$ 638,178				$ 604,872				638,178	604,872	485,659
Additional Paid-in-Capital [Member] | Equity Offering [Member]
Shareholders Equity [Line Items]
Shares issued pursuant to Offering/Program net, value										104,265
Additional Paid-in-Capital [Member] | ATM Program [Member]
Shareholders Equity [Line Items]
Shares issued pursuant to Offering/Program net, value									30,127	13,523	14,879
Dividends Paid in Excess of Earnings [Member]
Shareholders Equity [Line Items]
Beginning balance, value				$ (51,574)				$ (55,085)	(51,574)	(55,085)	(58,111)
Net earnings									47,706	47,186	38,411
Dividends declared									(53,555)	(43,675)	(35,385)
Ending balance, value	$ (57,423)				$ (51,574)				$ (57,423)	$ (51,574)	$ (55,085)

Stockholders' Equity - Summar_2

Stockholders' Equity - Summary of Changes in Stockholders' Equity (Parenthetical) (Detail) - $ / shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Equity [Abstract]
Dividends per share	$ 1.31	$ 1.16	$ 1.03

Stockholders' Equity - Addition

Stockholders' Equity - Additional Information (Detail)	Oct. 23, 2018shares	Mar. 01, 2018shares	Jul. 10, 2017USD ($)Offeringshares	Mar. 01, 2017shares	Mar. 31, 2018USD ($)	Jun. 30, 2016USD ($)	Dec. 31, 2018USD ($)$ / sharesshares	Dec. 31, 2017USD ($)$ / sharesshares	Dec. 31, 2016USD ($)shares	May 08, 2018shares	Oct. 25, 2017shares	Oct. 24, 2017$ / sharesshares
Shareholders Equity [Line Items]
Preferred stock, shares authorized							20,000,000	10,000,000		20,000,000	10,000,000	10,000,000
Preferred stock, par value | $ / shares							$ 0.01	$ 0.01				$ 0.01
Authorized but unissued preferred stock reclassified to common stock												10,000,000
Common stock, par value | $ / shares							$ 0.01	$ 0.01				$ 0.01
Shares authorized										120,000,000	70,000,000
Common stock, shares authorized							100,000,000	60,000,000		100,000,000	60,000,000
Number of shares of common stock the Company sold to the underwriters pursuant to the underwriting agreement			4,100,000
Common stock offering underwriting agreement additional shares granted			615,000
Payment of dividend | $							$ 50,503,000	$ 39,299,000
Dividends paid per share | $ / shares							$ 1.28	$ 1.12
Proceeds from issuance of common stock under the dividend reinvestment plan | $							$ 1,403,000	$ 1,271,000
Stock based compensation expense | $							$ 1,777,000	$ 1,350,000	$ 1,426,000
Common Stock [Member]
Shareholders Equity [Line Items]
Shares issued pursuant to dividend reinvestment, shares							51,920	47,922	43,000
2016 ATM Program [Member] | Maximum [Member]
Shareholders Equity [Line Items]
Aggregate sales price | $						$ 125,000,000
ATM Program [Member] | Maximum [Member]
Shareholders Equity [Line Items]
Aggregate sales price | $					$ 125,000,000
ATM Program [Member]
Shareholders Equity [Line Items]
Proceeds from issuance of shares | $							$ 30,138,000	$ 13,528,000	$ 14,886,000
ATM Program [Member] | Common Stock [Member]
Shareholders Equity [Line Items]
Proceeds from issuance of shares | $							$ 30,138,000	$ 13,528,000
Total shares issued							1,106,000	513,000	653,000
Underwriting Agreement [Member]
Shareholders Equity [Line Items]
Number Of Equity Offering Completed | Offering			1
Period granted to underwriter for purchase of additional shares			30 days
Proceeds from issuance of shares | $			$ 104,312,000
Restricted Stock Units [Member]
Shareholders Equity [Line Items]
Restricted stock units, granted							124,650	94,250	86,600
Amended and Restated 2004 Omnibus Incentive Compensation Plan [Member] | Restricted Stock Units [Member]
Shareholders Equity [Line Items]
Restricted stock units, granted	3,000	121,650		94,250

Employee Benefit Plans - Additi

Employee Benefit Plans - Additional Information (Detail) - USD ($)		1 Months Ended		12 Months Ended
		May 31, 2017	Feb. 28, 2013	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Schedule Of Share Based Compensation Arrangements By Share Based Payment Award Options [Line Items]
Grant awards		1,500,000		1,000,000
Maximum number of shares of common stock		200,000		100,000
Incentive compensation program expiration				2022-05
Fair value of grants recognition period	[1]			5 years
Additional grant awards		500,000
Vested of common stock				1
Issuance of common stock				1
Dividend equivalents charged against retained earnings when common stock dividends were declared				$ 749,000	$ 542,000	$ 445,000
Compensation expense				$ 1,777,000	1,350,000	1,426,000
Employer matching contribution percent				50.00%
Employee compensation				3.00%
Contributions, net of forfeitures				$ 295,000	$ 282,000	$ 268,000
Restricted Stock Units [Member]
Schedule Of Share Based Compensation Arrangements By Share Based Payment Award Options [Line Items]
Restricted stock awarded				124,650	94,250	86,600
Termination of grant				10 years
RSUs vest starting period from date of grant				1 year
Annual rate of vest of total number of RSUs				20.00%
Number of outstanding RSUs				573,575	448,925	429,775	400,375
Number of vested RSUs				289,020	225,385	221,819	202,344
Restricted Stock Units [Member] | 2012 Incentive Program [Member] | Employees And Directors [Member]
Schedule Of Share Based Compensation Arrangements By Share Based Payment Award Options [Line Items]
Restricted stock awarded			35,000
Restricted Stock Units [Member] | 2004 Omnibus Incentive Compensation Plan [Member]
Schedule Of Share Based Compensation Arrangements By Share Based Payment Award Options [Line Items]
Fair value of grants recognition period				5 years
Compensation expense				$ 1,752,000	$ 1,328,000	$ 1,418,000
Weighted average period				3 years
Number of outstanding RSUs				573,575
Number of vested RSUs				289,020
Intrinsic value of outstanding RSUs				$ 16,869,000
Intrinsic value of vested RSUs				8,500,000
Restricted Stock Units [Member] | 2004 Incentive Plan [Member]
Schedule Of Share Based Compensation Arrangements By Share Based Payment Award Options [Line Items]
Unrecognized compensation cost				$ 5,121,000
Supplemental Employee Retirement Plan [Member]
Schedule Of Share Based Compensation Arrangements By Share Based Payment Award Options [Line Items]
Executive compensation				10.00%
Distribution from supplemental plan				$ 0
Supplemental Employee Retirement Plan [Member] | Former Officers [Member]
Schedule Of Share Based Compensation Arrangements By Share Based Payment Award Options [Line Items]
Distribution from supplemental plan					$ 278,000	$ 469,000
Tranche One [Member]
Schedule Of Share Based Compensation Arrangements By Share Based Payment Award Options [Line Items]
Incentive compensation program vesting percentage				20.00%
[1]	five-year

Employee Benefit Plans - Schedu

Employee Benefit Plans - Schedule of Activity Relating to Restricted Stock Units Outstanding (Detail) - Restricted Stock Units [Member] - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Balance, RSUs Outstanding	448,925	429,775	400,375
Granted, Number of RSUs Outstanding	124,650	94,250	86,600
Settled, Number of RSUs Outstanding		(51,770)	(34,650)
Cancelled, Number of RSUs Outstanding		(23,330)	(22,550)
Balance, RSUs Outstanding	573,575	448,925	429,775
Granted, Fair Value Amount	$ 3,106,400	$ 2,484,400	$ 1,593,400
Settled, Fair Value Amount		1,306,300	635,800
Cancelled, Fair Value Amount		$ 587,100	$ 415,400
Granted, Fair Value Average Per RSU	$ 24.92	$ 26.36	$ 18.40
Settled, Fair Value Average Per RSU		25.23	18.35
Cancelled, Fair Value Average Per RSU		$ 25.17	$ 18.42

Employee Benefit Plans - Sche_2

Employee Benefit Plans - Schedule of Vesting Activity Relating to Restricted Stock Units Outstanding (Detail) - Restricted Stock Units [Member] - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Balance, RSUs Vested	225,385	221,819	202,344
Vested, Number of RSUs Vested	63,635	55,336	54,125
Settled, Number of RSUs Vested		(51,770)	(34,650)
Balance, RSUs Vested	289,020	225,385	221,819
Vested, Fair Value	$ 1,871,500	$ 1,502,900	$ 1,379,600
Settled, Fair Value		$ 1,306,300	$ 635,800

Earnings Per Common Share - Add

Earnings Per Common Share - Additional Information (Detail) - shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Stock Options [Member]
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Anti-dilutive securities Excluded from calculation of EPS	0	0	5,000

Earnings Per Common Share - Com

Earnings Per Common Share - Computation of Basic and Diluted Earnings Per Common Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Earnings Per Share [Abstract]
Earnings from continuing operations	$ 13,408	$ 11,017	$ 13,823	$ 10,162	$ 13,321	$ 9,460	$ 14,551	$ 7,716	$ 48,410	$ 45,048	$ 39,825
Less dividend equivalents attributable to RSUs outstanding									(751)	(567)	(482)
Earnings from continuing operations attributable to common stockholders									47,659	44,481	39,343
Earnings (loss) from discontinued operations									(704)	2,138	(1,414)
Earnings (loss) from discontinued operations attributable to common stockholders									(704)	2,138	(1,414)
Net earnings attributable to common stockholders used for basic and diluted earnings per share calculation									$ 46,955	$ 46,619	$ 37,929
Basic									40,171	36,897	33,806
Incremental shares from stock-based compensation									20
Diluted									40,191	36,897	33,806
Basic earnings per common share									$ 1.17	$ 1.26	$ 1.12
Diluted earnings per common share	$ 0.32	$ 0.27	$ 0.33	$ 0.25	$ 0.33	$ 0.24	$ 0.43	$ 0.28	$ 1.17	$ 1.26	$ 1.12

Fair Value Measurements - Addit

Fair Value Measurements - Additional Information (Detail) - Level 3 [Member] - Fair Value, Measurements, Nonrecurring [Member] - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impaired real estate assets measured at fair value	$ 3,096	$ 2,785
Senior Unsecured Notes [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of borrowings under senior unsecured notes	$ 335,600	$ 233,500

Fair Value Measurements - Sched

Fair Value Measurements - Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Mutual Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets	$ 534	$ 451
Deferred Compensation [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of liabilities	534	451
Level 1 [Member] | Mutual Funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of assets	534	451
Level 2 [Member] | Deferred Compensation [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of liabilities	$ 534	$ 451

Discontinued Operations and A_3

Discontinued Operations and Assets Held For Sale - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2018USD ($)Portfolio	Dec. 31, 2017USD ($)Portfolio
Discontinued Operations And Disposal Groups [Abstract]
Gain from sale of properties | $	$ 3,888,000	$ 1,025,000
Number of whole properties sold not meeting criteria of discontinued operations recognized gain included in continuing operations | Portfolio	9	12
Number of partial properties sold not meeting criteria of discontinued operations recognized gain included in continuing operations | Portfolio		1
Gain on property condemnations | $	$ 60,000	$ 16,000

Discontinued Operations and A_4

Discontinued Operations and Assets Held For Sale - Schedule of Activity From Discontinued Operations (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Discontinued Operations And Disposal Groups [Abstract]
Impairments	$ (1,268)	$ (1,042)	$ (4,248)
Changes in environmental estimates	564	3,169	3,010
Other operating income		11	2
Earnings (loss) from operating activities	(704)	2,138	(1,236)
(Loss) gains from dispositions of real estate			(178)
Earnings (loss) from discontinued operations	$ (704)	$ 2,138	$ (1,414)

Quarterly Financial Data - Summ

Quarterly Financial Data - Summary of Quarterly Results of Operations (Detail) - USD ($)	Aug. 03, 2015	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]
Revenues from rental properties	$ 15,000,000	$ 29,452,000	$ 29,570,000	$ 29,022,000	$ 28,284,000	$ 28,158,000	$ 24,913,000	$ 24,364,000	$ 23,897,000	$ 116,328,000	$ 101,332,000	$ 96,711,000
Earnings from continuing operations		13,408,000	11,017,000	13,823,000	10,162,000	13,321,000	9,460,000	14,551,000	7,716,000	48,410,000	45,048,000	39,825,000
Net earnings		$ 13,190,000	$ 10,944,000	$ 13,540,000	$ 10,032,000	$ 13,036,000	$ 9,340,000	$ 15,106,000	$ 9,704,000	$ 47,706,000	$ 47,186,000	$ 38,411,000
Diluted earnings per common share:
Earnings from continuing operations		$ 0.33	$ 0.27	$ 0.34	$ 0.25	$ 0.33	$ 0.24	$ 0.41	$ 0.22	$ 1.19	$ 1.20	$ 1.16
Net earnings		$ 0.32	$ 0.27	$ 0.33	$ 0.25	$ 0.33	$ 0.24	$ 0.43	$ 0.28	$ 1.17	$ 1.26	$ 1.12

Property Acquisitions - Additio

Property Acquisitions - Additional Information (Detail)	Aug. 01, 2018USD ($)PropertyOption	Apr. 17, 2018USD ($)PropertyOption	Oct. 03, 2017USD ($)PropertyOptionRestaurant	Sep. 06, 2017USD ($)PropertyOption	Dec. 31, 2018USD ($)Property	Dec. 31, 2017USD ($)Property	Dec. 31, 2016USD ($)
Business Acquisition [Line Items]
Number of gasoline stations and convenience stores acquired during the period | Property					41	103
Aggregate purchase price of the gasoline stations and convenience stores acquired during the period					$ 77,972,000	$ 214,000,000	$ 7,688,000
Number of stand-alone Burger King quick service restaurants acquired during the period | Restaurant			5
GPM Investments, LLC [Member]
Business Acquisition [Line Items]
Number of gasoline stations and convenience stores acquired during the period | Property		30			5
Aggregate purchase price of the gasoline stations and convenience stores acquired during the period		$ 52,592,000			$ 7,968,000
Unitary lease description					The unitary lease requires GPM to pay a fixed annual rent plus all amounts pertaining to the properties, including environmental expenses, real estate taxes, assessments, license and permit fees, charges for public utilities and all other governmental charges. Rent is scheduled to increase annually during the initial and renewal terms of the lease.
Unitary lease initial term		15 years
Number of unitary lease renewal options | Option		4
Unitary lease renewal term		5 years
Purchase price allocation, land acquired		$ 31,633,000			$ 4,929,000
Purchase price allocation, buildings and improvements acquired		17,489,000			2,753,000
Purchase price allocated to in-place leases		4,047,000			$ 286,000
Purchase price allocated to below market leases		$ 577,000
Applegreen PLC [Member]
Business Acquisition [Line Items]
Number of gasoline stations and convenience stores acquired during the period | Property	6
Aggregate purchase price of the gasoline stations and convenience stores acquired during the period	$ 17,412,000		$ 68,710,000
Unitary lease description					. The unitary lease requires Applegreen to pay a fixed annual rent plus all amounts pertaining to the properties, including environmental expenses, real estate taxes, assessments, license and permit fees, charges for public utilities and all other governmental charges. Rent is scheduled to increase annually during the initial and renewal terms of the lease.
Unitary lease initial term	15 years		15 years
Number of unitary lease renewal options | Option	4		4
Unitary lease renewal term	5 years		5 years
Purchase price allocation, land acquired	$ 8,930,000		$ 36,874,000
Purchase price allocation, buildings and improvements acquired	6,773,000		27,431,000
Purchase price allocated to in-place leases	1,371,000		4,548,000
Purchase price allocated to below market leases	435,000		1,104,000
Purchase price allocated to above market leases	$ 773,000		$ 961,000
Number of convenience stores and gasoline stations | Property			33
Empire Petroleum Partners, LLC [Member]
Business Acquisition [Line Items]
Number of gasoline stations and convenience stores acquired during the period | Property				49
Aggregate purchase price of the gasoline stations and convenience stores acquired during the period				$ 123,126,000
Unitary lease description					The unitary lease provides for an initial term of 15 years, with four five-year renewal options. The unitary lease requires Empire to pay a fixed annual rent plus all amounts pertaining to the properties including environmental expenses, real estate taxes, assessments, license and permit fees, charges for public utilities and all other governmental charges. Rent is scheduled to increase annually during the initial and renewal terms of the lease.
Unitary lease initial term				15 years
Number of unitary lease renewal options | Option				4
Unitary lease renewal term				5 years
Purchase price allocation, land acquired				$ 75,674,000
Purchase price allocation, buildings and improvements acquired				38,205,000
Purchase price allocated to in-place leases				9,058,000
Purchase price allocated to above market leases				$ 189,000
Gasoline Stations And Convenience Store Properties
Business Acquisition [Line Items]
Purchase price allocation, land acquired						5,800,000
Purchase price allocation, buildings and improvements acquired						14,424,000
Purchase price allocated to in-place leases						2,969,000
Purchase price allocated to below market leases						$ 1,028,000
Additional number of gasoline stations and convenience stores acquired during the period | Property						16
Additional aggregate purchase price of the gasoline stations and convenience stores acquired during the period						$ 22,164,000

Acquired Intangible Assets - Ad

Acquired Intangible Assets - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Above- Market and Below- Market Leases [Member] | Operating Income [Member]
Business Acquisition [Line Items]
Amortization from acquired leases	$ 2,067,000	$ 1,791,000	$ 1,833,000
Above- Market and Below- Market Leases [Member] | Operating Expenses [Member]
Business Acquisition [Line Items]
Amortization from acquired leases	317,000	320,000	333,000
Above- Market and Below- Market Leases [Member] | Prepaid Expenses And Other Assets [Member]
Business Acquisition [Line Items]
Finite lived intangible asset	3,500,000	3,189,000
Accumulated amortization	5,160,000	4,698,000
Above- Market and Below- Market Leases [Member] | Accounts Payable and Accrued Liabilities [Member]
Business Acquisition [Line Items]
Accumulated amortization	17,790,000	15,578,000
Finite lived intangible liabilities	21,514,000	22,714,000
In-Place Leases [Member]
Business Acquisition [Line Items]
Depreciation and amortization expense	2,866,000	1,855,000	$ 1,395,000
In-Place Leases [Member] | Prepaid Expenses And Other Assets [Member]
Business Acquisition [Line Items]
Finite lived intangible asset	38,542,000	35,704,000
Accumulated amortization	$ 9,908,000	$ 7,043,000

Acquired Intangible Assets - Sc

Acquired Intangible Assets - Schedule of Amortization for Acquired Intangible Assets (Detail)	Dec. 31, 2018USD ($)
Above Market Leases [Member] | Lessor [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
2,019	$ 158,000
2,020	152,000
2,021	144,000
2,022	135,000
2,023	135,000
Thereafter	1,330,000
Total	2,054,000
Below Market Leases [Member] | Lessor [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
2,019	2,142,000
2,020	1,736,000
2,021	1,562,000
2,022	1,484,000
2,023	1,393,000
Thereafter	13,197,000
Total	21,514,000
Below Market Leases [Member] | Lessee [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
2,019	312,000
2,020	222,000
2,021	157,000
2,022	127,000
2,023	126,000
Thereafter	502,000
Total	1,446,000
In-Place Leases [Member] | Lessor [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
2,019	2,994,000
2,020	2,973,000
2,021	2,954,000
2,022	2,942,000
2,023	2,940,000
Thereafter	23,739,000
Total	$ 38,542,000

Schedule II - Valuation and Q_2

Schedule II - Valuation and Qualifying Accounts and Reserves (Detail) - Allowance For Accounts Receivables [Member] - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Valuation And Qualifying Accounts Disclosure [Line Items]
Balance at beginning of year	$ 1,840	$ 2,006	$ 2,634
Additions	480	420	855
Deductions	226	586	1,483
Balance at end of year	$ 2,094	$ 1,840	$ 2,006

Schedule III - Real Estate an_2

Schedule III - Real Estate and Accumulated Depreciation and Amortization - Schedule of Changes in Real Estate Assets and Accumulated Depreciation (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Investment in real estate:
Balance at beginning of year	$ 970,964	$ 782,166	$ 783,233
Acquisitions and capital expenditures	84,069	205,598	19,097
Impairments	(7,950)	(10,623)	(13,590)
Sales and condemnations	(3,091)	(4,520)	(6,379)
Lease expirations/settlements	(886)	(1,657)	(195)
Balance at end of year	1,043,106	970,964	782,166
Accumulated depreciation and amortization:
Balance at beginning of year	133,353	120,576	107,370
Depreciation and amortization	20,549	17,018	16,629
Impairments	(1,780)	(1,301)	(776)
Sales and condemnations	(530)	(1,229)	(2,559)
Lease expirations/settlements	(901)	(1,711)	(88)
Balance at end of year	$ 150,691	$ 133,353	$ 120,576

Schedule III - Real Estate an_3

Schedule III - Real Estate and Accumulated Depreciation and Amortization Part 1 (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Schedule Of Investments In Real Estate [Line Items]
Total Investment in Real Estate	$ 1,043,106	$ 970,964	$ 782,166	$ 783,233
Accumulated Depreciation And Amortization Description [Member] | ARKANSAS [Member] | Bluff [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	2,985
Land	2,166
Building and Improvements	819
Total Investment in Real Estate	2,985
Accumulated Depreciation and Amortization	$ 30
Date of Initial Leasehold or Acquisition Investment	2,018
Accumulated Depreciation And Amortization Description [Member] | ARKANSAS [Member] | Brookland One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,468
Land	149
Building and Improvements	1,319
Total Investment in Real Estate	1,468
Accumulated Depreciation and Amortization	$ 615
Date of Initial Leasehold or Acquisition Investment	2,007
Accumulated Depreciation And Amortization Description [Member] | ARKANSAS [Member] | Jonesboro One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 868
Land	173
Building and Improvements	695
Total Investment in Real Estate	868
Accumulated Depreciation and Amortization	$ 338
Date of Initial Leasehold or Acquisition Investment	2,007
Accumulated Depreciation And Amortization Description [Member] | ARKANSAS [Member] | Fayetteville One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 2,266
Land	1,637
Building and Improvements	629
Total Investment in Real Estate	2,266
Accumulated Depreciation and Amortization	$ 23
Date of Initial Leasehold or Acquisition Investment	2,018
Accumulated Depreciation And Amortization Description [Member] | ARKANSAS [Member] | Jonesboro Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 2,985
Land	330
Building and Improvements	2,655
Total Investment in Real Estate	2,985
Accumulated Depreciation and Amortization	$ 1,285
Date of Initial Leasehold or Acquisition Investment	2,007
Accumulated Depreciation And Amortization Description [Member] | ARKANSAS [Member] | Fayetteville Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 2,867
Land	1,971
Building and Improvements	896
Total Investment in Real Estate	2,867
Accumulated Depreciation and Amortization	$ 33
Date of Initial Leasehold or Acquisition Investment	2,018
Accumulated Depreciation And Amortization Description [Member] | ARKANSAS [Member] | Hope [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,472
Land	999
Building and Improvements	473
Total Investment in Real Estate	1,472
Accumulated Depreciation and Amortization	$ 18
Date of Initial Leasehold or Acquisition Investment	2,018
Accumulated Depreciation And Amortization Description [Member] | ARKANSAS [Member] | Little Rock [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 978
Land	535
Building and Improvements	443
Total Investment in Real Estate	978
Accumulated Depreciation and Amortization	$ 19
Date of Initial Leasehold or Acquisition Investment	2,018
Accumulated Depreciation And Amortization Description [Member] | ARKANSAS [Member] | Rogers [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 927
Land	533
Building and Improvements	394
Total Investment in Real Estate	927
Accumulated Depreciation and Amortization	$ 17
Date of Initial Leasehold or Acquisition Investment	2,018
Accumulated Depreciation And Amortization Description [Member] | ARKANSAS [Member] | Texarkana [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,592
Land	1,058
Building and Improvements	534
Total Investment in Real Estate	1,592
Accumulated Depreciation and Amortization	$ 21
Date of Initial Leasehold or Acquisition Investment	2,018
Accumulated Depreciation And Amortization Description [Member] | CALIFORNIA [Member] | Bellflower One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,369
Land	910
Building and Improvements	459
Total Investment in Real Estate	1,369
Accumulated Depreciation and Amortization	$ 271
Date of Initial Leasehold or Acquisition Investment	2,007
Accumulated Depreciation And Amortization Description [Member] | CALIFORNIA [Member] | Benicia One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 2,224
Land	1,058
Building and Improvements	1,166
Total Investment in Real Estate	2,224
Accumulated Depreciation and Amortization	$ 714
Date of Initial Leasehold or Acquisition Investment	2,007
Accumulated Depreciation And Amortization Description [Member] | CALIFORNIA [Member] | Chula Vista One[Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 2,385
Land	889
Building and Improvements	1,496
Total Investment in Real Estate	2,385
Accumulated Depreciation and Amortization	$ 299
Date of Initial Leasehold or Acquisition Investment	2,014
Accumulated Depreciation And Amortization Description [Member] | CALIFORNIA [Member] | Coachella One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 2,235
Land	1,217
Building and Improvements	1,018
Total Investment in Real Estate	2,235
Accumulated Depreciation and Amortization	$ 589
Date of Initial Leasehold or Acquisition Investment	2,007
Accumulated Depreciation And Amortization Description [Member] | CALIFORNIA [Member] | Cotati One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 6,072
Land	4,008
Building and Improvements	2,064
Total Investment in Real Estate	6,072
Accumulated Depreciation and Amortization	$ 407
Date of Initial Leasehold or Acquisition Investment	2,015
Accumulated Depreciation And Amortization Description [Member] | CALIFORNIA [Member] | Fillmore One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,354
Land	950
Building and Improvements	404
Total Investment in Real Estate	1,354
Accumulated Depreciation and Amortization	$ 238
Date of Initial Leasehold or Acquisition Investment	2,007
Accumulated Depreciation And Amortization Description [Member] | CALIFORNIA [Member] | Grass Valley One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,485
Land	853
Building and Improvements	632
Total Investment in Real Estate	1,485
Accumulated Depreciation and Amortization	$ 128
Date of Initial Leasehold or Acquisition Investment	2,015
Accumulated Depreciation And Amortization Description [Member] | CALIFORNIA [Member] | Hesperia One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,643
Land	849
Building and Improvements	794
Total Investment in Real Estate	1,643
Accumulated Depreciation and Amortization	$ 440
Date of Initial Leasehold or Acquisition Investment	2,007
Accumulated Depreciation And Amortization Description [Member] | CALIFORNIA [Member] | Hesperia Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 2,055
Land	492
Building and Improvements	1,563
Total Investment in Real Estate	2,055
Accumulated Depreciation and Amortization	$ 375
Date of Initial Leasehold or Acquisition Investment	2,015
Accumulated Depreciation And Amortization Description [Member] | CALIFORNIA [Member] | Indio One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,250
Land	302
Building and Improvements	948
Total Investment in Real Estate	1,250
Accumulated Depreciation and Amortization	$ 201
Date of Initial Leasehold or Acquisition Investment	2,015
Accumulated Depreciation And Amortization Description [Member] | CALIFORNIA [Member] | Indio Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 2,727
Land	1,486
Building and Improvements	1,241
Total Investment in Real Estate	2,727
Accumulated Depreciation and Amortization	$ 276
Date of Initial Leasehold or Acquisition Investment	2,015
Accumulated Depreciation And Amortization Description [Member] | CALIFORNIA [Member] | La Palma One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,971
Land	1,389
Building and Improvements	582
Total Investment in Real Estate	1,971
Accumulated Depreciation and Amortization	$ 339
Date of Initial Leasehold or Acquisition Investment	2,007
Accumulated Depreciation And Amortization Description [Member] | CALIFORNIA [Member] | La Puenta [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 7,615
Land	6,405
Building and Improvements	1,210
Total Investment in Real Estate	7,615
Accumulated Depreciation and Amortization	$ 282
Date of Initial Leasehold or Acquisition Investment	2,015
Accumulated Depreciation And Amortization Description [Member] | ARIZONA [Member] | Cochise One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,765
Land	269
Building and Improvements	1,496
Total Investment in Real Estate	1,765
Accumulated Depreciation and Amortization	$ 133
Date of Initial Leasehold or Acquisition Investment	2,017
Accumulated Depreciation And Amortization Description [Member] | ARIZONA [Member] | Cochise Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 4,440
Land	1,849
Building and Improvements	2,591
Total Investment in Real Estate	4,440
Accumulated Depreciation and Amortization	$ 182
Date of Initial Leasehold or Acquisition Investment	2,017
Accumulated Depreciation And Amortization Description [Member] | ARIZONA [Member] | Maricopa One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,331
Land	992
Building and Improvements	339
Total Investment in Real Estate	1,331
Accumulated Depreciation and Amortization	$ 30
Date of Initial Leasehold or Acquisition Investment	2,017
Accumulated Depreciation And Amortization Description [Member] | ARIZONA [Member] | Maricopa Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,448
Land	983
Building and Improvements	465
Total Investment in Real Estate	1,448
Accumulated Depreciation and Amortization	$ 40
Date of Initial Leasehold or Acquisition Investment	2,017
Accumulated Depreciation And Amortization Description [Member] | ARIZONA [Member] | Maricopa Three [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,503
Land	839
Building and Improvements	664
Total Investment in Real Estate	1,503
Accumulated Depreciation and Amortization	$ 55
Date of Initial Leasehold or Acquisition Investment	2,017
Accumulated Depreciation And Amortization Description [Member] | ARIZONA [Member] | Phoenix One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,943
Land	1,311
Building and Improvements	632
Total Investment in Real Estate	1,943
Accumulated Depreciation and Amortization	$ 18
Date of Initial Leasehold or Acquisition Investment	2,018
Accumulated Depreciation And Amortization Description [Member] | ARIZONA [Member] | Maricopa Four [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,602
Land	796
Building and Improvements	806
Total Investment in Real Estate	1,602
Accumulated Depreciation and Amortization	$ 68
Date of Initial Leasehold or Acquisition Investment	2,017
Accumulated Depreciation And Amortization Description [Member] | ARIZONA [Member] | Maricopa Five [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,722
Land	1,178
Building and Improvements	544
Total Investment in Real Estate	1,722
Accumulated Depreciation and Amortization	$ 45
Date of Initial Leasehold or Acquisition Investment	2,017
Accumulated Depreciation And Amortization Description [Member] | ARIZONA [Member] | Maricopa Six [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,838
Land	1,261
Building and Improvements	577
Total Investment in Real Estate	1,838
Accumulated Depreciation and Amortization	$ 50
Date of Initial Leasehold or Acquisition Investment	2,017
Accumulated Depreciation And Amortization Description [Member] | ARIZONA [Member] | Maricopa Seven [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 2,177
Land	1,532
Building and Improvements	645
Total Investment in Real Estate	2,177
Accumulated Depreciation and Amortization	$ 53
Date of Initial Leasehold or Acquisition Investment	2,017
Accumulated Depreciation And Amortization Description [Member] | ARIZONA [Member] | Maricopa Eight [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 2,185
Land	1,612
Building and Improvements	573
Total Investment in Real Estate	2,185
Accumulated Depreciation and Amortization	$ 48
Date of Initial Leasehold or Acquisition Investment	2,017
Accumulated Depreciation And Amortization Description [Member] | ARIZONA [Member] | Maricopa Nine [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 2,415
Land	433
Building and Improvements	1,982
Total Investment in Real Estate	2,415
Accumulated Depreciation and Amortization	$ 140
Date of Initial Leasehold or Acquisition Investment	2,017
Accumulated Depreciation And Amortization Description [Member] | ARIZONA [Member] | Maricopa Ten [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 2,868
Land	1,255
Building and Improvements	1,613
Total Investment in Real Estate	2,868
Accumulated Depreciation and Amortization	$ 128
Date of Initial Leasehold or Acquisition Investment	2,017
Accumulated Depreciation And Amortization Description [Member] | ARIZONA [Member] | Maricopa Eleven [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 3,112
Land	1,593
Building and Improvements	1,519
Total Investment in Real Estate	3,112
Accumulated Depreciation and Amortization	$ 118
Date of Initial Leasehold or Acquisition Investment	2,017
Accumulated Depreciation And Amortization Description [Member] | ARIZONA [Member] | Maricopa Twelve [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 3,169
Land	2,005
Building and Improvements	1,164
Total Investment in Real Estate	3,169
Accumulated Depreciation and Amortization	$ 87
Date of Initial Leasehold or Acquisition Investment	2,017
Accumulated Depreciation And Amortization Description [Member] | ARIZONA [Member] | Maricopa Thirteen [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 3,204
Land	1,839
Building and Improvements	1,365
Total Investment in Real Estate	3,204
Accumulated Depreciation and Amortization	$ 106
Date of Initial Leasehold or Acquisition Investment	2,017
Accumulated Depreciation And Amortization Description [Member] | ARIZONA [Member] | Maricopa Fourteen [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 3,928
Land	2,334
Building and Improvements	1,594
Total Investment in Real Estate	3,928
Accumulated Depreciation and Amortization	$ 116
Date of Initial Leasehold or Acquisition Investment	2,017
Accumulated Depreciation And Amortization Description [Member] | ARIZONA [Member] | Pima One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,261
Land	664
Building and Improvements	597
Total Investment in Real Estate	1,261
Accumulated Depreciation and Amortization	$ 49
Date of Initial Leasehold or Acquisition Investment	2,017
Accumulated Depreciation And Amortization Description [Member] | ARIZONA [Member] | Pima Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,301
Land	557
Building and Improvements	744
Total Investment in Real Estate	1,301
Accumulated Depreciation and Amortization	$ 60
Date of Initial Leasehold or Acquisition Investment	2,017
Accumulated Depreciation And Amortization Description [Member] | ARIZONA [Member] | Pima Three [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,303
Land	590
Building and Improvements	713
Total Investment in Real Estate	1,303
Accumulated Depreciation and Amortization	$ 58
Date of Initial Leasehold or Acquisition Investment	2,017
Accumulated Depreciation And Amortization Description [Member] | ARIZONA [Member] | Pima Four [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 2,085
Land	1,487
Building and Improvements	598
Total Investment in Real Estate	2,085
Accumulated Depreciation and Amortization	$ 52
Date of Initial Leasehold or Acquisition Investment	2,017
Accumulated Depreciation And Amortization Description [Member] | ARIZONA [Member] | Pima Five [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 3,652
Land	2,924
Building and Improvements	728
Total Investment in Real Estate	3,652
Accumulated Depreciation and Amortization	$ 59
Date of Initial Leasehold or Acquisition Investment	2,017
Accumulated Depreciation And Amortization Description [Member] | ARIZONA [Member] | Pinal [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 4,022
Land	2,549
Building and Improvements	1,473
Total Investment in Real Estate	4,022
Accumulated Depreciation and Amortization	$ 119
Date of Initial Leasehold or Acquisition Investment	2,017

Schedule III - Real Estate an_4

Schedule III - Real Estate and Accumulated Depreciation and Amortization Part 2 (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Schedule Of Investments In Real Estate [Line Items]
Total Investment in Real Estate	$ 1,043,106	$ 970,964	$ 782,166	$ 783,233
Accumulated Depreciation And Amortization Description [Member] | ARKANSAS [Member] | Bluff [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	2,985
Land	2,166
Building and Improvements	819
Total Investment in Real Estate	2,985
Accumulated Depreciation and Amortization	$ 30
Date of Initial Leasehold or Acquisition Investment	2,018
Accumulated Depreciation And Amortization Description [Member] | ARKANSAS [Member] | Brookland One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,468
Land	149
Building and Improvements	1,319
Total Investment in Real Estate	1,468
Accumulated Depreciation and Amortization	$ 615
Date of Initial Leasehold or Acquisition Investment	2,007
Accumulated Depreciation And Amortization Description [Member] | ARKANSAS [Member] | Jonesboro One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 868
Land	173
Building and Improvements	695
Total Investment in Real Estate	868
Accumulated Depreciation and Amortization	$ 338
Date of Initial Leasehold or Acquisition Investment	2,007
Accumulated Depreciation And Amortization Description [Member] | ARKANSAS [Member] | Fayetteville One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 2,266
Land	1,637
Building and Improvements	629
Total Investment in Real Estate	2,266
Accumulated Depreciation and Amortization	$ 23
Date of Initial Leasehold or Acquisition Investment	2,018
Accumulated Depreciation And Amortization Description [Member] | ARKANSAS [Member] | Jonesboro Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 2,985
Land	330
Building and Improvements	2,655
Total Investment in Real Estate	2,985
Accumulated Depreciation and Amortization	$ 1,285
Date of Initial Leasehold or Acquisition Investment	2,007
Accumulated Depreciation And Amortization Description [Member] | ARKANSAS [Member] | Fayetteville Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 2,867
Land	1,971
Building and Improvements	896
Total Investment in Real Estate	2,867
Accumulated Depreciation and Amortization	$ 33
Date of Initial Leasehold or Acquisition Investment	2,018
Accumulated Depreciation And Amortization Description [Member] | ARKANSAS [Member] | Hope [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,472
Land	999
Building and Improvements	473
Total Investment in Real Estate	1,472
Accumulated Depreciation and Amortization	$ 18
Date of Initial Leasehold or Acquisition Investment	2,018
Accumulated Depreciation And Amortization Description [Member] | ARKANSAS [Member] | Little Rock [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 978
Land	535
Building and Improvements	443
Total Investment in Real Estate	978
Accumulated Depreciation and Amortization	$ 19
Date of Initial Leasehold or Acquisition Investment	2,018
Accumulated Depreciation And Amortization Description [Member] | ARKANSAS [Member] | Rogers [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 927
Land	533
Building and Improvements	394
Total Investment in Real Estate	927
Accumulated Depreciation and Amortization	$ 17
Date of Initial Leasehold or Acquisition Investment	2,018
Accumulated Depreciation And Amortization Description [Member] | ARKANSAS [Member] | Texarkana [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,592
Land	1,058
Building and Improvements	534
Total Investment in Real Estate	1,592
Accumulated Depreciation and Amortization	$ 21
Date of Initial Leasehold or Acquisition Investment	2,018
Accumulated Depreciation And Amortization Description [Member] | CALIFORNIA [Member] | Bellflower One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,369
Land	910
Building and Improvements	459
Total Investment in Real Estate	1,369
Accumulated Depreciation and Amortization	$ 271
Date of Initial Leasehold or Acquisition Investment	2,007
Accumulated Depreciation And Amortization Description [Member] | CALIFORNIA [Member] | Benicia One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 2,224
Land	1,058
Building and Improvements	1,166
Total Investment in Real Estate	2,224
Accumulated Depreciation and Amortization	$ 714
Date of Initial Leasehold or Acquisition Investment	2,007
Accumulated Depreciation And Amortization Description [Member] | CALIFORNIA [Member] | Chula Vista One[Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 2,385
Land	889
Building and Improvements	1,496
Total Investment in Real Estate	2,385
Accumulated Depreciation and Amortization	$ 299
Date of Initial Leasehold or Acquisition Investment	2,014
Accumulated Depreciation And Amortization Description [Member] | CALIFORNIA [Member] | Coachella One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 2,235
Land	1,217
Building and Improvements	1,018
Total Investment in Real Estate	2,235
Accumulated Depreciation and Amortization	$ 589
Date of Initial Leasehold or Acquisition Investment	2,007
Accumulated Depreciation And Amortization Description [Member] | CALIFORNIA [Member] | Cotati One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 6,072
Land	4,008
Building and Improvements	2,064
Total Investment in Real Estate	6,072
Accumulated Depreciation and Amortization	$ 407
Date of Initial Leasehold or Acquisition Investment	2,015
Accumulated Depreciation And Amortization Description [Member] | CALIFORNIA [Member] | Fillmore One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,354
Land	950
Building and Improvements	404
Total Investment in Real Estate	1,354
Accumulated Depreciation and Amortization	$ 238
Date of Initial Leasehold or Acquisition Investment	2,007
Accumulated Depreciation And Amortization Description [Member] | CALIFORNIA [Member] | Grass Valley One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,485
Land	853
Building and Improvements	632
Total Investment in Real Estate	1,485
Accumulated Depreciation and Amortization	$ 128
Date of Initial Leasehold or Acquisition Investment	2,015
Accumulated Depreciation And Amortization Description [Member] | CALIFORNIA [Member] | Hesperia One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,643
Land	849
Building and Improvements	794
Total Investment in Real Estate	1,643
Accumulated Depreciation and Amortization	$ 440
Date of Initial Leasehold or Acquisition Investment	2,007
Accumulated Depreciation And Amortization Description [Member] | CALIFORNIA [Member] | Hesperia Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 2,055
Land	492
Building and Improvements	1,563
Total Investment in Real Estate	2,055
Accumulated Depreciation and Amortization	$ 375
Date of Initial Leasehold or Acquisition Investment	2,015
Accumulated Depreciation And Amortization Description [Member] | CALIFORNIA [Member] | Indio One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,250
Land	302
Building and Improvements	948
Total Investment in Real Estate	1,250
Accumulated Depreciation and Amortization	$ 201
Date of Initial Leasehold or Acquisition Investment	2,015
Accumulated Depreciation And Amortization Description [Member] | CALIFORNIA [Member] | Indio Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 2,727
Land	1,486
Building and Improvements	1,241
Total Investment in Real Estate	2,727
Accumulated Depreciation and Amortization	$ 276
Date of Initial Leasehold or Acquisition Investment	2,015
Accumulated Depreciation And Amortization Description [Member] | CALIFORNIA [Member] | La Palma One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,971
Land	1,389
Building and Improvements	582
Total Investment in Real Estate	1,971
Accumulated Depreciation and Amortization	$ 339
Date of Initial Leasehold or Acquisition Investment	2,007
Accumulated Depreciation And Amortization Description [Member] | CALIFORNIA [Member] | La Puenta [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 7,615
Land	6,405
Building and Improvements	1,210
Total Investment in Real Estate	7,615
Accumulated Depreciation and Amortization	$ 282
Date of Initial Leasehold or Acquisition Investment	2,015
Accumulated Depreciation And Amortization Description [Member] | CALIFORNIA [Member] | Lakeside [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 3,715
Land	2,695
Building and Improvements	1,020
Total Investment in Real Estate	3,715
Accumulated Depreciation and Amortization	$ 226
Date of Initial Leasehold or Acquisition Investment	2,015
Accumulated Depreciation And Amortization Description [Member] | ARIZONA [Member] | Cochise One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,765
Land	269
Building and Improvements	1,496
Total Investment in Real Estate	1,765
Accumulated Depreciation and Amortization	$ 133
Date of Initial Leasehold or Acquisition Investment	2,017
Accumulated Depreciation And Amortization Description [Member] | ARIZONA [Member] | Cochise Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 4,440
Land	1,849
Building and Improvements	2,591
Total Investment in Real Estate	4,440
Accumulated Depreciation and Amortization	$ 182
Date of Initial Leasehold or Acquisition Investment	2,017
Accumulated Depreciation And Amortization Description [Member] | ARIZONA [Member] | Maricopa One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,331
Land	992
Building and Improvements	339
Total Investment in Real Estate	1,331
Accumulated Depreciation and Amortization	$ 30
Date of Initial Leasehold or Acquisition Investment	2,017
Accumulated Depreciation And Amortization Description [Member] | ARIZONA [Member] | Maricopa Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,448
Land	983
Building and Improvements	465
Total Investment in Real Estate	1,448
Accumulated Depreciation and Amortization	$ 40
Date of Initial Leasehold or Acquisition Investment	2,017
Accumulated Depreciation And Amortization Description [Member] | ARIZONA [Member] | Maricopa Three [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,503
Land	839
Building and Improvements	664
Total Investment in Real Estate	1,503
Accumulated Depreciation and Amortization	$ 55
Date of Initial Leasehold or Acquisition Investment	2,017
Accumulated Depreciation And Amortization Description [Member] | ARIZONA [Member] | Phoenix One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,943
Land	1,311
Building and Improvements	632
Total Investment in Real Estate	1,943
Accumulated Depreciation and Amortization	$ 18
Date of Initial Leasehold or Acquisition Investment	2,018
Accumulated Depreciation And Amortization Description [Member] | ARIZONA [Member] | Maricopa Four [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,602
Land	796
Building and Improvements	806
Total Investment in Real Estate	1,602
Accumulated Depreciation and Amortization	$ 68
Date of Initial Leasehold or Acquisition Investment	2,017
Accumulated Depreciation And Amortization Description [Member] | ARIZONA [Member] | Maricopa Five [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,722
Land	1,178
Building and Improvements	544
Total Investment in Real Estate	1,722
Accumulated Depreciation and Amortization	$ 45
Date of Initial Leasehold or Acquisition Investment	2,017
Accumulated Depreciation And Amortization Description [Member] | ARIZONA [Member] | Maricopa Six [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,838
Land	1,261
Building and Improvements	577
Total Investment in Real Estate	1,838
Accumulated Depreciation and Amortization	$ 50
Date of Initial Leasehold or Acquisition Investment	2,017
Accumulated Depreciation And Amortization Description [Member] | ARIZONA [Member] | Maricopa Seven [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 2,177
Land	1,532
Building and Improvements	645
Total Investment in Real Estate	2,177
Accumulated Depreciation and Amortization	$ 53
Date of Initial Leasehold or Acquisition Investment	2,017
Accumulated Depreciation And Amortization Description [Member] | ARIZONA [Member] | Maricopa Eight [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 2,185
Land	1,612
Building and Improvements	573
Total Investment in Real Estate	2,185
Accumulated Depreciation and Amortization	$ 48
Date of Initial Leasehold or Acquisition Investment	2,017
Accumulated Depreciation And Amortization Description [Member] | ARIZONA [Member] | Maricopa Nine [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 2,415
Land	433
Building and Improvements	1,982
Total Investment in Real Estate	2,415
Accumulated Depreciation and Amortization	$ 140
Date of Initial Leasehold or Acquisition Investment	2,017
Accumulated Depreciation And Amortization Description [Member] | ARIZONA [Member] | Maricopa Ten [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 2,868
Land	1,255
Building and Improvements	1,613
Total Investment in Real Estate	2,868
Accumulated Depreciation and Amortization	$ 128
Date of Initial Leasehold or Acquisition Investment	2,017
Accumulated Depreciation And Amortization Description [Member] | ARIZONA [Member] | Maricopa Eleven [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 3,112
Land	1,593
Building and Improvements	1,519
Total Investment in Real Estate	3,112
Accumulated Depreciation and Amortization	$ 118
Date of Initial Leasehold or Acquisition Investment	2,017
Accumulated Depreciation And Amortization Description [Member] | ARIZONA [Member] | Maricopa Twelve [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 3,169
Land	2,005
Building and Improvements	1,164
Total Investment in Real Estate	3,169
Accumulated Depreciation and Amortization	$ 87
Date of Initial Leasehold or Acquisition Investment	2,017
Accumulated Depreciation And Amortization Description [Member] | ARIZONA [Member] | Maricopa Thirteen [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 3,204
Land	1,839
Building and Improvements	1,365
Total Investment in Real Estate	3,204
Accumulated Depreciation and Amortization	$ 106
Date of Initial Leasehold or Acquisition Investment	2,017
Accumulated Depreciation And Amortization Description [Member] | ARIZONA [Member] | Maricopa Fourteen [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 3,928
Land	2,334
Building and Improvements	1,594
Total Investment in Real Estate	3,928
Accumulated Depreciation and Amortization	$ 116
Date of Initial Leasehold or Acquisition Investment	2,017
Accumulated Depreciation And Amortization Description [Member] | ARIZONA [Member] | Pima One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,261
Land	664
Building and Improvements	597
Total Investment in Real Estate	1,261
Accumulated Depreciation and Amortization	$ 49
Date of Initial Leasehold or Acquisition Investment	2,017
Accumulated Depreciation And Amortization Description [Member] | ARIZONA [Member] | Pima Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,301
Land	557
Building and Improvements	744
Total Investment in Real Estate	1,301
Accumulated Depreciation and Amortization	$ 60
Date of Initial Leasehold or Acquisition Investment	2,017
Accumulated Depreciation And Amortization Description [Member] | ARIZONA [Member] | Pima Three [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,303
Land	590
Building and Improvements	713
Total Investment in Real Estate	1,303
Accumulated Depreciation and Amortization	$ 58
Date of Initial Leasehold or Acquisition Investment	2,017
Accumulated Depreciation And Amortization Description [Member] | ARIZONA [Member] | Pima Four [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 2,085
Land	1,487
Building and Improvements	598
Total Investment in Real Estate	2,085
Accumulated Depreciation and Amortization	$ 52
Date of Initial Leasehold or Acquisition Investment	2,017
Accumulated Depreciation And Amortization Description [Member] | ARIZONA [Member] | Pima Five [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 3,652
Land	2,924
Building and Improvements	728
Total Investment in Real Estate	3,652
Accumulated Depreciation and Amortization	$ 59
Date of Initial Leasehold or Acquisition Investment	2,017

Schedule III - Real Estate an_5

Schedule III - Real Estate and Accumulated Depreciation and Amortization Part 3 (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Schedule Of Investments In Real Estate [Line Items]
Total Investment in Real Estate	$ 1,043,106	$ 970,964	$ 782,166	$ 783,233
CALIFORNIA [Member] | Accumulated Depreciation And Amortization Description [Member] | Los Angeles One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	6,612
Land	5,006
Building and Improvements	1,606
Total Investment in Real Estate	6,612
Accumulated Depreciation and Amortization	$ 371
Date of Initial Leasehold or Acquisition Investment	2,015
CALIFORNIA [Member] | Accumulated Depreciation And Amortization Description [Member] | Oakland One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 5,434
Land	4,123
Building and Improvements	1,311
Total Investment in Real Estate	5,434
Accumulated Depreciation and Amortization	$ 298
Date of Initial Leasehold or Acquisition Investment	2,015
CALIFORNIA [Member] | Accumulated Depreciation And Amortization Description [Member] | Ontario One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 6,613
Land	4,523
Building and Improvements	2,090
Total Investment in Real Estate	6,613
Accumulated Depreciation and Amortization	$ 483
Date of Initial Leasehold or Acquisition Investment	2,015
CALIFORNIA [Member] | Accumulated Depreciation And Amortization Description [Member] | Phelan One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 4,611
Land	3,276
Building and Improvements	1,335
Total Investment in Real Estate	4,611
Accumulated Depreciation and Amortization	$ 315
Date of Initial Leasehold or Acquisition Investment	2,015
CALIFORNIA [Member] | Accumulated Depreciation And Amortization Description [Member] | Riverside One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 2,130
Land	1,619
Building and Improvements	511
Total Investment in Real Estate	2,130
Accumulated Depreciation and Amortization	$ 144
Date of Initial Leasehold or Acquisition Investment	2,015
CALIFORNIA [Member] | Accumulated Depreciation And Amortization Description [Member] | Riverside Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 2,737
Land	1,216
Building and Improvements	1,521
Total Investment in Real Estate	2,737
Accumulated Depreciation and Amortization	$ 333
Date of Initial Leasehold or Acquisition Investment	2,014
CALIFORNIA [Member] | Accumulated Depreciation And Amortization Description [Member] | Sacramento One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 3,193
Land	2,207
Building and Improvements	986
Total Investment in Real Estate	3,193
Accumulated Depreciation and Amortization	$ 232
Date of Initial Leasehold or Acquisition Investment	2,015
CALIFORNIA [Member] | Accumulated Depreciation And Amortization Description [Member] | Sacramento Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 4,247
Land	2,604
Building and Improvements	1,643
Total Investment in Real Estate	4,247
Accumulated Depreciation and Amortization	$ 343
Date of Initial Leasehold or Acquisition Investment	2,015
CALIFORNIA [Member] | Accumulated Depreciation And Amortization Description [Member] | Sacramento Three [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 5,942
Land	4,233
Building and Improvements	1,709
Total Investment in Real Estate	5,942
Accumulated Depreciation and Amortization	$ 381
Date of Initial Leasehold or Acquisition Investment	2,015
CALIFORNIA [Member] | Accumulated Depreciation And Amortization Description [Member] | SanDimas One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,941
Land	749
Building and Improvements	1,192
Total Investment in Real Estate	1,941
Accumulated Depreciation and Amortization	$ 617
Date of Initial Leasehold or Acquisition Investment	2,007
CALIFORNIA [Member] | Accumulated Depreciation And Amortization Description [Member] | San Jose One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 5,412
Land	4,219
Building and Improvements	1,193
Total Investment in Real Estate	5,412
Accumulated Depreciation and Amortization	$ 297
Date of Initial Leasehold or Acquisition Investment	2,015
CALIFORNIA [Member] | Accumulated Depreciation And Amortization Description [Member] | San Leandro One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 5,978
Land	5,078
Building and Improvements	900
Total Investment in Real Estate	5,978
Accumulated Depreciation and Amortization	$ 220
Date of Initial Leasehold or Acquisition Investment	2,015
CALIFORNIA [Member] | Accumulated Depreciation And Amortization Description [Member] | Shingle Springs One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 4,751
Land	3,489
Building and Improvements	1,262
Total Investment in Real Estate	4,751
Accumulated Depreciation and Amortization	$ 290
Date of Initial Leasehold or Acquisition Investment	2,015
CALIFORNIA [Member] | Accumulated Depreciation And Amortization Description [Member] | Stockton One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,187
Land	627
Building and Improvements	560
Total Investment in Real Estate	1,187
Accumulated Depreciation and Amortization	$ 132
Date of Initial Leasehold or Acquisition Investment	2,015
CALIFORNIA [Member] | Accumulated Depreciation And Amortization Description [Member] | Stockton Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 3,001
Land	1,460
Building and Improvements	1,541
Total Investment in Real Estate	3,001
Accumulated Depreciation and Amortization	$ 327
Date of Initial Leasehold or Acquisition Investment	2,015
COLORADO | Accumulated Depreciation And Amortization Description [Member] | Adams [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 2,157
Land	1,579
Building and Improvements	578
Total Investment in Real Estate	2,157
Accumulated Depreciation and Amortization	$ 50
Date of Initial Leasehold or Acquisition Investment	2,017
COLORADO | Accumulated Depreciation And Amortization Description [Member] | Arapahoe One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 2,495
Land	2,207
Building and Improvements	288
Total Investment in Real Estate	2,495
Accumulated Depreciation and Amortization	$ 29
Date of Initial Leasehold or Acquisition Investment	2,017
COLORADO | Accumulated Depreciation And Amortization Description [Member] | Arapahoe Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 2,874
Land	2,284
Building and Improvements	590
Total Investment in Real Estate	2,874
Accumulated Depreciation and Amortization	$ 49
Date of Initial Leasehold or Acquisition Investment	2,017
COLORADO | Accumulated Depreciation And Amortization Description [Member] | Boulder One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 3,900
Land	2,875
Building and Improvements	1,025
Total Investment in Real Estate	3,900
Accumulated Depreciation and Amortization	$ 214
Date of Initial Leasehold or Acquisition Investment	2,015
COLORADO | Accumulated Depreciation And Amortization Description [Member] | Broomfield One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 2,380
Land	1,496
Building and Improvements	884
Total Investment in Real Estate	2,380
Accumulated Depreciation and Amortization	$ 67
Date of Initial Leasehold or Acquisition Investment	2,017
COLORADO | Accumulated Depreciation And Amortization Description [Member] | Castle Rock [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 5,269
Land	3,269
Building and Improvements	2,000
Total Investment in Real Estate	5,269
Accumulated Depreciation and Amortization	$ 446
Date of Initial Leasehold or Acquisition Investment	2,015
COLORADO | Accumulated Depreciation And Amortization Description [Member] | EL Paso One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,382
Land	756
Building and Improvements	626
Total Investment in Real Estate	1,382
Accumulated Depreciation and Amortization	$ 49
Date of Initial Leasehold or Acquisition Investment	2,017
COLORADO | Accumulated Depreciation And Amortization Description [Member] | EL Paso Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 3,274
Land	2,865
Building and Improvements	409
Total Investment in Real Estate	3,274
Accumulated Depreciation and Amortization	$ 36
Date of Initial Leasehold or Acquisition Investment	2,017
COLORADO | Accumulated Depreciation And Amortization Description [Member] | EL Paso Three [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 3,828
Land	2,798
Building and Improvements	1,030
Total Investment in Real Estate	3,828
Accumulated Depreciation and Amortization	$ 94
Date of Initial Leasehold or Acquisition Investment	2,017
COLORADO | Accumulated Depreciation And Amortization Description [Member] | Golden One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 4,641
Land	3,247
Building and Improvements	1,394
Total Investment in Real Estate	4,641
Accumulated Depreciation and Amortization	$ 302
Date of Initial Leasehold or Acquisition Investment	2,015
COLORADO | Accumulated Depreciation And Amortization Description [Member] | Greenwood Village One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 4,077
Land	2,889
Building and Improvements	1,188
Total Investment in Real Estate	4,077
Accumulated Depreciation and Amortization	$ 246
Date of Initial Leasehold or Acquisition Investment	2,015
COLORADO | Accumulated Depreciation And Amortization Description [Member] | Highlands Ranch One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 4,356
Land	2,921
Building and Improvements	1,435
Total Investment in Real Estate	4,356
Accumulated Depreciation and Amortization	$ 318
Date of Initial Leasehold or Acquisition Investment	2,015
COLORADO | Accumulated Depreciation And Amortization Description [Member] | Jefferson One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,785
Land	1,388
Building and Improvements	397
Total Investment in Real Estate	1,785
Accumulated Depreciation and Amortization	$ 36
Date of Initial Leasehold or Acquisition Investment	2,017
COLORADO | Accumulated Depreciation And Amortization Description [Member] | Lakewood One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 2,349
Land	1,541
Building and Improvements	808
Total Investment in Real Estate	2,349
Accumulated Depreciation and Amortization	$ 170
Date of Initial Leasehold or Acquisition Investment	2,015
COLORADO | Accumulated Depreciation And Amortization Description [Member] | Littleton One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 4,139
Land	2,272
Building and Improvements	1,867
Total Investment in Real Estate	4,139
Accumulated Depreciation and Amortization	$ 413
Date of Initial Leasehold or Acquisition Investment	2,015
COLORADO | Accumulated Depreciation And Amortization Description [Member] | Lone Tree One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 6,612
Land	5,125
Building and Improvements	1,487
Total Investment in Real Estate	6,612
Accumulated Depreciation and Amortization	$ 344
Date of Initial Leasehold or Acquisition Investment	2,015
COLORADO | Accumulated Depreciation And Amortization Description [Member] | Longmont One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 3,619
Land	2,315
Building and Improvements	1,304
Total Investment in Real Estate	3,619
Accumulated Depreciation and Amortization	$ 302
Date of Initial Leasehold or Acquisition Investment	2,015
COLORADO | Accumulated Depreciation And Amortization Description [Member] | Louisville One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 6,605
Land	5,228
Building and Improvements	1,377
Total Investment in Real Estate	6,605
Accumulated Depreciation and Amortization	$ 313
Date of Initial Leasehold or Acquisition Investment	2,015
COLORADO | Accumulated Depreciation And Amortization Description [Member] | Morrison One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 5,081
Land	3,018
Building and Improvements	2,063
Total Investment in Real Estate	5,081
Accumulated Depreciation and Amortization	$ 472
Date of Initial Leasehold or Acquisition Investment	2,015
COLORADO | Accumulated Depreciation And Amortization Description [Member] | Superior One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 3,748
Land	2,477
Building and Improvements	1,271
Total Investment in Real Estate	3,748
Accumulated Depreciation and Amortization	$ 281
Date of Initial Leasehold or Acquisition Investment	2,015
COLORADO | Accumulated Depreciation And Amortization Description [Member] | Thornton One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 5,003
Land	2,722
Building and Improvements	2,281
Total Investment in Real Estate	5,003
Accumulated Depreciation and Amortization	$ 505
Date of Initial Leasehold or Acquisition Investment	2,015
COLORADO | Accumulated Depreciation And Amortization Description [Member] | Westminster One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,457
Land	752
Building and Improvements	705
Total Investment in Real Estate	1,457
Accumulated Depreciation and Amortization	$ 152
Date of Initial Leasehold or Acquisition Investment	2,015
COLORADO | Accumulated Depreciation And Amortization Description [Member] | Wheat Ridge One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 6,151
Land	4,201
Building and Improvements	1,950
Total Investment in Real Estate	6,151
Accumulated Depreciation and Amortization	$ 445
Date of Initial Leasehold or Acquisition Investment	2,015
CONNECTICUT [Member] | Accumulated Depreciation And Amortization Description [Member] | Avon One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 731
Cost Capitalized Subsequent to Initial Investment	50
Land	403
Building and Improvements	378
Total Investment in Real Estate	781
Accumulated Depreciation and Amortization	$ 279
Date of Initial Leasehold or Acquisition Investment	2,002
CONNECTICUT [Member] | Accumulated Depreciation And Amortization Description [Member] | Bridgeport One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 59
Cost Capitalized Subsequent to Initial Investment	380
Land	24
Building and Improvements	415
Total Investment in Real Estate	439
Accumulated Depreciation and Amortization	$ 251
Date of Initial Leasehold or Acquisition Investment	1,982
CONNECTICUT [Member] | Accumulated Depreciation And Amortization Description [Member] | Bridgeport Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 313
Cost Capitalized Subsequent to Initial Investment	298
Land	204
Building and Improvements	407
Total Investment in Real Estate	611
Accumulated Depreciation and Amortization	$ 225
Date of Initial Leasehold or Acquisition Investment	1,985

Schedule III - Real Estate an_6

Schedule III - Real Estate and Accumulated Depreciation and Amortization Part 4 (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Schedule Of Investments In Real Estate [Line Items]
Total Investment in Real Estate	$ 1,043,106	$ 970,964	$ 782,166	$ 783,233
CONNECTICUT [Member] | Accumulated Depreciation And Amortization Description [Member] | Bridgeport Three [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	350
Cost Capitalized Subsequent to Initial Investment	330
Land	228
Building and Improvements	452
Total Investment in Real Estate	680
Accumulated Depreciation and Amortization	$ 268
Date of Initial Leasehold or Acquisition Investment	1,985
CONNECTICUT [Member] | Accumulated Depreciation And Amortization Description [Member] | Bridgeport Four [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 377
Cost Capitalized Subsequent to Initial Investment	391
Land	246
Building and Improvements	522
Total Investment in Real Estate	768
Accumulated Depreciation and Amortization	$ 326
Date of Initial Leasehold or Acquisition Investment	1,985
CONNECTICUT [Member] | Accumulated Depreciation And Amortization Description [Member] | Bristol One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,594
Land	1,036
Building and Improvements	558
Total Investment in Real Estate	1,594
Accumulated Depreciation and Amortization	$ 316
Date of Initial Leasehold or Acquisition Investment	2,004
CONNECTICUT [Member] | Accumulated Depreciation And Amortization Description [Member] | Brookfield One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 58
Cost Capitalized Subsequent to Initial Investment	432
Land	20
Building and Improvements	470
Total Investment in Real Estate	490
Accumulated Depreciation and Amortization	$ 305
Date of Initial Leasehold or Acquisition Investment	1,985
CONNECTICUT [Member] | Accumulated Depreciation And Amortization Description [Member] | Darien One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 667
Cost Capitalized Subsequent to Initial Investment	285
Land	434
Building and Improvements	518
Total Investment in Real Estate	952
Accumulated Depreciation and Amortization	$ 424
Date of Initial Leasehold or Acquisition Investment	1,985
CONNECTICUT [Member] | Accumulated Depreciation And Amortization Description [Member] | Durham Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 994
Building and Improvements	994
Total Investment in Real Estate	994
Accumulated Depreciation and Amortization	$ 994
Date of Initial Leasehold or Acquisition Investment	2,004

Schedule III - Real Estate an_7

Schedule III - Real Estate and Accumulated Depreciation and Amortization Part 5 (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Schedule Of Investments In Real Estate [Line Items]
Total Investment in Real Estate	$ 1,043,106	$ 970,964	$ 782,166	$ 783,233
CONNECTICUT [Member] | Accumulated Depreciation And Amortization Description [Member] | East Hartford One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	208
Cost Capitalized Subsequent to Initial Investment	224
Land	54
Building and Improvements	378
Total Investment in Real Estate	432
Accumulated Depreciation and Amortization	$ 262
Date of Initial Leasehold or Acquisition Investment	1,982
CONNECTICUT [Member] | Accumulated Depreciation And Amortization Description [Member] | Ellington One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,295
Land	842
Building and Improvements	453
Total Investment in Real Estate	1,295
Accumulated Depreciation and Amortization	$ 257
Date of Initial Leasehold or Acquisition Investment	2,004
CONNECTICUT [Member] | Accumulated Depreciation And Amortization Description [Member] | Farmington One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 466
Land	303
Building and Improvements	163
Total Investment in Real Estate	466
Accumulated Depreciation and Amortization	$ 92
Date of Initial Leasehold or Acquisition Investment	2,004
CONNECTICUT [Member] | Accumulated Depreciation And Amortization Description [Member] | Franklin One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 51
Cost Capitalized Subsequent to Initial Investment	447
Land	20
Building and Improvements	478
Total Investment in Real Estate	498
Accumulated Depreciation and Amortization	$ 312
Date of Initial Leasehold or Acquisition Investment	1,982
CONNECTICUT [Member] | Accumulated Depreciation And Amortization Description [Member] | Hamden One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 645
Land	527
Building and Improvements	118
Total Investment in Real Estate	645
Accumulated Depreciation and Amortization	$ 1
Date of Initial Leasehold or Acquisition Investment	2,018
CONNECTICUT [Member] | Accumulated Depreciation And Amortization Description [Member] | Hartford One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 665
Land	432
Building and Improvements	233
Total Investment in Real Estate	665
Accumulated Depreciation and Amortization	$ 132
Date of Initial Leasehold or Acquisition Investment	2,004
CONNECTICUT [Member] | Accumulated Depreciation And Amortization Description [Member] | Manchester One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 110
Cost Capitalized Subsequent to Initial Investment	323
Land	50
Building and Improvements	383
Total Investment in Real Estate	433
Accumulated Depreciation and Amortization	$ 206
Date of Initial Leasehold or Acquisition Investment	1,987
CONNECTICUT [Member] | Accumulated Depreciation And Amortization Description [Member] | Meriden One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 208
Cost Capitalized Subsequent to Initial Investment	341
Land	84
Building and Improvements	465
Total Investment in Real Estate	549
Accumulated Depreciation and Amortization	$ 289
Date of Initial Leasehold or Acquisition Investment	1,982
CONNECTICUT [Member] | Accumulated Depreciation And Amortization Description [Member] | Meriden Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,532
Land	989
Building and Improvements	543
Total Investment in Real Estate	1,532
Accumulated Depreciation and Amortization	$ 312
Date of Initial Leasehold or Acquisition Investment	2,004
CONNECTICUT [Member] | Accumulated Depreciation And Amortization Description [Member] | Middletown One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 133
Cost Capitalized Subsequent to Initial Investment	735
Land	131
Building and Improvements	737
Total Investment in Real Estate	868
Accumulated Depreciation and Amortization	$ 349
Date of Initial Leasehold or Acquisition Investment	1,987
CONNECTICUT [Member] | Accumulated Depreciation And Amortization Description [Member] | New Haven One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 217
Cost Capitalized Subsequent to Initial Investment	297
Land	141
Building and Improvements	373
Total Investment in Real Estate	514
Accumulated Depreciation and Amortization	$ 196
Date of Initial Leasehold or Acquisition Investment	1,985
CONNECTICUT [Member] | Accumulated Depreciation And Amortization Description [Member] | New Haven Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 539
Cost Capitalized Subsequent to Initial Investment	219
Land	351
Building and Improvements	407
Total Investment in Real Estate	758
Accumulated Depreciation and Amortization	$ 333
Date of Initial Leasehold or Acquisition Investment	1,985
CONNECTICUT [Member] | Accumulated Depreciation And Amortization Description [Member] | New Haven Three [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,413
Cost Capitalized Subsequent to Initial Investment	(323)
Land	569
Building and Improvements	521
Total Investment in Real Estate	1,090
Accumulated Depreciation and Amortization	$ 208
Date of Initial Leasehold or Acquisition Investment	1,985
CONNECTICUT [Member] | Accumulated Depreciation And Amortization Description [Member] | Newington One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 954
Land	620
Building and Improvements	334
Total Investment in Real Estate	954
Accumulated Depreciation and Amortization	$ 189
Date of Initial Leasehold or Acquisition Investment	2,004
CONNECTICUT [Member] | Accumulated Depreciation And Amortization Description [Member] | North Haven One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 90
Cost Capitalized Subsequent to Initial Investment	669
Land	365
Building and Improvements	394
Total Investment in Real Estate	759
Accumulated Depreciation and Amortization	$ 192
Date of Initial Leasehold or Acquisition Investment	1,982
CONNECTICUT [Member] | Accumulated Depreciation And Amortization Description [Member] | North Haven Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 405
Land	252
Building and Improvements	153
Total Investment in Real Estate	405
Accumulated Depreciation and Amortization	$ 95
Date of Initial Leasehold or Acquisition Investment	2,004
CONNECTICUT [Member] | Accumulated Depreciation And Amortization Description [Member] | Norwalk One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 511
Cost Capitalized Subsequent to Initial Investment	46
Land	332
Building and Improvements	225
Total Investment in Real Estate	557
Accumulated Depreciation and Amortization	$ 195
Date of Initial Leasehold or Acquisition Investment	1,985
CONNECTICUT [Member] | Accumulated Depreciation And Amortization Description [Member] | Norwalk Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Cost Capitalized Subsequent to Initial Investment	$ 941
Land	402
Building and Improvements	539
Total Investment in Real Estate	941
Accumulated Depreciation and Amortization	$ 270
Date of Initial Leasehold or Acquisition Investment	1,988
CONNECTICUT [Member] | Accumulated Depreciation And Amortization Description [Member] | Norwich [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 107
Cost Capitalized Subsequent to Initial Investment	323
Land	44
Building and Improvements	386
Total Investment in Real Estate	430
Accumulated Depreciation and Amortization	$ 226
Date of Initial Leasehold or Acquisition Investment	1,982
CONNECTICUT [Member] | Accumulated Depreciation And Amortization Description [Member] | Old Greenwich One [Member]
Schedule Of Investments In Real Estate [Line Items]
Cost Capitalized Subsequent to Initial Investment	$ 1,219
Land	620
Building and Improvements	599
Total Investment in Real Estate	1,219
Accumulated Depreciation and Amortization	$ 277
Date of Initial Leasehold or Acquisition Investment	1,969
CONNECTICUT [Member] | Accumulated Depreciation And Amortization Description [Member] | Plymouth One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 931
Land	605
Building and Improvements	326
Total Investment in Real Estate	931
Accumulated Depreciation and Amortization	$ 185
Date of Initial Leasehold or Acquisition Investment	2,004
CONNECTICUT [Member] | Accumulated Depreciation And Amortization Description [Member] | Ridgefield One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 402
Cost Capitalized Subsequent to Initial Investment	304
Land	167
Building and Improvements	539
Total Investment in Real Estate	706
Accumulated Depreciation and Amortization	$ 378
Date of Initial Leasehold or Acquisition Investment	1,985
CONNECTICUT [Member] | Accumulated Depreciation And Amortization Description [Member] | South Windham One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 644
Cost Capitalized Subsequent to Initial Investment	1,398
Land	598
Building and Improvements	1,444
Total Investment in Real Estate	2,042
Accumulated Depreciation and Amortization	$ 664
Date of Initial Leasehold or Acquisition Investment	2,004
CONNECTICUT [Member] | Accumulated Depreciation And Amortization Description [Member] | South Windsor One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 545
Land	337
Building and Improvements	208
Total Investment in Real Estate	545
Accumulated Depreciation and Amortization	$ 130
Date of Initial Leasehold or Acquisition Investment	2,004
CONNECTICUT [Member] | Accumulated Depreciation And Amortization Description [Member] | Stamford One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 507
Cost Capitalized Subsequent to Initial Investment	16
Land	330
Building and Improvements	193
Total Investment in Real Estate	523
Accumulated Depreciation and Amortization	$ 164
Date of Initial Leasehold or Acquisition Investment	1,985
CONNECTICUT [Member] | Accumulated Depreciation And Amortization Description [Member] | Stamford Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 604
Cost Capitalized Subsequent to Initial Investment	98
Land	393
Building and Improvements	309
Total Investment in Real Estate	702
Accumulated Depreciation and Amortization	$ 233
Date of Initial Leasehold or Acquisition Investment	1,985
CONNECTICUT [Member] | Accumulated Depreciation And Amortization Description [Member] | Stamford Three [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 507
Cost Capitalized Subsequent to Initial Investment	453
Land	330
Building and Improvements	630
Total Investment in Real Estate	960
Accumulated Depreciation and Amortization	$ 357
Date of Initial Leasehold or Acquisition Investment	1,985
CONNECTICUT [Member] | Accumulated Depreciation And Amortization Description [Member] | Suffield One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 237
Cost Capitalized Subsequent to Initial Investment	603
Land	201
Building and Improvements	639
Total Investment in Real Estate	840
Accumulated Depreciation and Amortization	$ 505
Date of Initial Leasehold or Acquisition Investment	2,004
CONNECTICUT [Member] | Accumulated Depreciation And Amortization Description [Member] | Vernon One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,434
Building and Improvements	1,434
Total Investment in Real Estate	1,434
Accumulated Depreciation and Amortization	$ 1,434
Date of Initial Leasehold or Acquisition Investment	2,004
CONNECTICUT [Member] | Accumulated Depreciation And Amortization Description [Member] | Wallingford One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 551
Land	335
Building and Improvements	216
Total Investment in Real Estate	551
Accumulated Depreciation and Amortization	$ 138
Date of Initial Leasehold or Acquisition Investment	2,004

Schedule III - Real Estate an_8

Schedule III - Real Estate and Accumulated Depreciation and Amortization Part 6 (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Schedule Of Investments In Real Estate [Line Items]
Total Investment in Real Estate	$ 1,043,106	$ 970,964	$ 782,166	$ 783,233
CONNECTICUT [Member] | Accumulated Depreciation And Amortization Description [Member] | Waterbury One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	469
Land	305
Building and Improvements	164
Total Investment in Real Estate	469
Accumulated Depreciation and Amortization	$ 93
Date of Initial Leasehold or Acquisition Investment	2,004
CONNECTICUT [Member] | Accumulated Depreciation And Amortization Description [Member] | Waterbury Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 515
Land	335
Building and Improvements	180
Total Investment in Real Estate	515
Accumulated Depreciation and Amortization	$ 102
Date of Initial Leasehold or Acquisition Investment	2,004
CONNECTICUT [Member] | Accumulated Depreciation And Amortization Description [Member] | Waterbury Three [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 804
Land	516
Building and Improvements	288
Total Investment in Real Estate	804
Accumulated Depreciation and Amortization	$ 167
Date of Initial Leasehold or Acquisition Investment	2,004
CONNECTICUT [Member] | Accumulated Depreciation And Amortization Description [Member] | Watertown Five [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 352
Cost Capitalized Subsequent to Initial Investment	59
Land	204
Building and Improvements	207
Total Investment in Real Estate	411
Accumulated Depreciation and Amortization	$ 168
Date of Initial Leasehold or Acquisition Investment	1,992
CONNECTICUT [Member] | Accumulated Depreciation And Amortization Description [Member] | Watertown Six [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 925
Land	567
Building and Improvements	358
Total Investment in Real Estate	925
Accumulated Depreciation and Amortization	$ 225
Date of Initial Leasehold or Acquisition Investment	2,004
CONNECTICUT [Member] | Accumulated Depreciation And Amortization Description [Member] | West Haven One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 185
Cost Capitalized Subsequent to Initial Investment	322
Land	74
Building and Improvements	433
Total Investment in Real Estate	507
Accumulated Depreciation and Amortization	$ 269
Date of Initial Leasehold or Acquisition Investment	1,982
CONNECTICUT [Member] | Accumulated Depreciation And Amortization Description [Member] | West Haven Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,215
Land	790
Building and Improvements	425
Total Investment in Real Estate	1,215
Accumulated Depreciation and Amortization	$ 241
Date of Initial Leasehold or Acquisition Investment	2,004
CONNECTICUT [Member] | Accumulated Depreciation And Amortization Description [Member] | Westport One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 604
Cost Capitalized Subsequent to Initial Investment	12
Land	393
Building and Improvements	223
Total Investment in Real Estate	616
Accumulated Depreciation and Amortization	$ 189
Date of Initial Leasehold or Acquisition Investment	1,985
CONNECTICUT [Member] | Accumulated Depreciation And Amortization Description [Member] | Wethersfield One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 447
Building and Improvements	447
Total Investment in Real Estate	447
Accumulated Depreciation and Amortization	$ 447
Date of Initial Leasehold or Acquisition Investment	2,004
CONNECTICUT [Member] | Accumulated Depreciation And Amortization Description [Member] | Willimantic One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 717
Land	466
Building and Improvements	251
Total Investment in Real Estate	717
Accumulated Depreciation and Amortization	$ 142
Date of Initial Leasehold or Acquisition Investment	2,004
CONNECTICUT [Member] | Accumulated Depreciation And Amortization Description [Member] | Wilton One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 519
Cost Capitalized Subsequent to Initial Investment	214
Land	338
Building and Improvements	395
Total Investment in Real Estate	733
Accumulated Depreciation and Amortization	$ 295
Date of Initial Leasehold or Acquisition Investment	1,985
CONNECTICUT [Member] | Accumulated Depreciation And Amortization Description [Member] | Windsor Locks One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,031
Land	670
Building and Improvements	361
Total Investment in Real Estate	1,031
Accumulated Depreciation and Amortization	$ 204
Date of Initial Leasehold or Acquisition Investment	2,004
CONNECTICUT [Member] | Accumulated Depreciation And Amortization Description [Member] | Windsor Locks Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,434
Cost Capitalized Subsequent to Initial Investment	1,400
Land	1,055
Building and Improvements	1,779
Total Investment in Real Estate	2,834
Accumulated Depreciation and Amortization	$ 1,484
Date of Initial Leasehold or Acquisition Investment	2,004
DISTRICT OF COLUMBIA [Member] | Accumulated Depreciation And Amortization Description [Member] | Washington One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 848
Land	418
Building and Improvements	430
Total Investment in Real Estate	848
Accumulated Depreciation and Amortization	$ 121
Date of Initial Leasehold or Acquisition Investment	2,013
DISTRICT OF COLUMBIA [Member] | Accumulated Depreciation And Amortization Description [Member] | Washington Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 941
Land	664
Building and Improvements	277
Total Investment in Real Estate	941
Accumulated Depreciation and Amortization	$ 90
Date of Initial Leasehold or Acquisition Investment	2,013
FLORIDA [Member] | Accumulated Depreciation And Amortization Description [Member] | Nassau One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,963
Land	570
Building and Improvements	1,393
Total Investment in Real Estate	1,963
Accumulated Depreciation and Amortization	$ 102
Date of Initial Leasehold or Acquisition Investment	2,017
FLORIDA [Member] | Accumulated Depreciation And Amortization Description [Member] | Nassau Three [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 2,137
Land	382
Building and Improvements	1,755
Total Investment in Real Estate	2,137
Accumulated Depreciation and Amortization	$ 129
Date of Initial Leasehold or Acquisition Investment	2,017

Schedule III - Real Estate an_9

Schedule III - Real Estate and Accumulated Depreciation and Amortization Part 7 (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Schedule Of Investments In Real Estate [Line Items]
Total Investment in Real Estate	$ 1,043,106	$ 970,964	$ 782,166	$ 783,233
FLORIDA [Member] | Accumulated Depreciation And Amortization Description [Member] | Nassau Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	2,894
Land	2,056
Building and Improvements	838
Total Investment in Real Estate	2,894
Accumulated Depreciation and Amortization	$ 71
Date of Initial Leasehold or Acquisition Investment	2,017
FLORIDA [Member] | Accumulated Depreciation And Amortization Description [Member] | Orlando One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 867
Cost Capitalized Subsequent to Initial Investment	34
Land	401
Building and Improvements	500
Total Investment in Real Estate	901
Accumulated Depreciation and Amortization	$ 378
Date of Initial Leasehold or Acquisition Investment	2,000
MASSACHUSETTS [Member] | Accumulated Depreciation And Amortization Description [Member] | Auburn Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 600
Land	600
Total Investment in Real Estate	$ 600
Date of Initial Leasehold or Acquisition Investment	2,011
MASSACHUSETTS [Member] | Accumulated Depreciation And Amortization Description [Member] | Barre One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 536
Cost Capitalized Subsequent to Initial Investment	12
Land	348
Building and Improvements	200
Total Investment in Real Estate	548
Accumulated Depreciation and Amortization	$ 127
Date of Initial Leasehold or Acquisition Investment	1,991
MASSACHUSETTS [Member] | Accumulated Depreciation And Amortization Description [Member] | Bedford One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,350
Land	1,350
Total Investment in Real Estate	$ 1,350
Date of Initial Leasehold or Acquisition Investment	2,011
MASSACHUSETTS [Member] | Accumulated Depreciation And Amortization Description [Member] | Bellingham One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 734
Cost Capitalized Subsequent to Initial Investment	73
Land	476
Building and Improvements	331
Total Investment in Real Estate	807
Accumulated Depreciation and Amortization	$ 289
Date of Initial Leasehold or Acquisition Investment	1,985
MASSACHUSETTS [Member] | Accumulated Depreciation And Amortization Description [Member] | Belmont One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 390
Cost Capitalized Subsequent to Initial Investment	29
Land	254
Building and Improvements	165
Total Investment in Real Estate	419
Accumulated Depreciation and Amortization	$ 143
Date of Initial Leasehold or Acquisition Investment	1,985
MASSACHUSETTS [Member] | Accumulated Depreciation And Amortization Description [Member] | Bradford One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 650
Land	650
Total Investment in Real Estate	$ 650
Date of Initial Leasehold or Acquisition Investment	2,011
MASSACHUSETTS [Member] | Accumulated Depreciation And Amortization Description [Member] | Burlington One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 600
Land	600
Total Investment in Real Estate	$ 600
Date of Initial Leasehold or Acquisition Investment	2,011
MASSACHUSETTS [Member] | Accumulated Depreciation And Amortization Description [Member] | Burlington Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,250
Land	1,250
Total Investment in Real Estate	$ 1,250
Date of Initial Leasehold or Acquisition Investment	2,011
MASSACHUSETTS [Member] | Accumulated Depreciation And Amortization Description [Member] | Arlington One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 519
Cost Capitalized Subsequent to Initial Investment	27
Land	338
Building and Improvements	208
Total Investment in Real Estate	546
Accumulated Depreciation and Amortization	$ 178
Date of Initial Leasehold or Acquisition Investment	1,985
MASSACHUSETTS [Member] | Accumulated Depreciation And Amortization Description [Member] | Auburn One [Member]
Schedule Of Investments In Real Estate [Line Items]
Cost Capitalized Subsequent to Initial Investment	$ 535
Land	388
Building and Improvements	147
Total Investment in Real Estate	535
Accumulated Depreciation and Amortization	$ 51
Date of Initial Leasehold or Acquisition Investment	1,996
MASSACHUSETTS [Member] | Accumulated Depreciation And Amortization Description [Member] | Auburn Three [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 625
Land	625
Total Investment in Real Estate	$ 625
Date of Initial Leasehold or Acquisition Investment	2,011
MASSACHUSETTS [Member] | Accumulated Depreciation And Amortization Description [Member] | Auburn Four [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 370
Cost Capitalized Subsequent to Initial Investment	305
Land	240
Building and Improvements	435
Total Investment in Real Estate	675
Accumulated Depreciation and Amortization	$ 245
Date of Initial Leasehold or Acquisition Investment	1,991
MASSACHUSETTS [Member] | Accumulated Depreciation And Amortization Description [Member] | Auburn Five [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 725
Land	725
Total Investment in Real Estate	$ 725
Date of Initial Leasehold or Acquisition Investment	2,011
MASSACHUSETTS [Member] | Accumulated Depreciation And Amortization Description [Member] | Auburn Six [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 800
Building and Improvements	800
Total Investment in Real Estate	800
Accumulated Depreciation and Amortization	$ 605
Date of Initial Leasehold or Acquisition Investment	2,011
GEORGIA [Member] | Accumulated Depreciation And Amortization Description [Member] | Houston [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,724
Land	1,312
Building and Improvements	412
Total Investment in Real Estate	1,724
Accumulated Depreciation and Amortization	$ 37
Date of Initial Leasehold or Acquisition Investment	2,017
GEORGIA [Member] | Accumulated Depreciation And Amortization Description [Member] | Richmond [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 3,150
Land	286
Building and Improvements	2,864
Total Investment in Real Estate	3,150
Accumulated Depreciation and Amortization	$ 236
Date of Initial Leasehold or Acquisition Investment	2,017
HAWAII | Accumulated Depreciation And Amortization Description [Member] | Haleiwa One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,522
Land	1,058
Building and Improvements	464
Total Investment in Real Estate	1,522
Accumulated Depreciation and Amortization	$ 325
Date of Initial Leasehold or Acquisition Investment	2,007
HAWAII | Accumulated Depreciation And Amortization Description [Member] | Honolulu One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,071
Cost Capitalized Subsequent to Initial Investment	30
Land	981
Building and Improvements	120
Total Investment in Real Estate	1,101
Accumulated Depreciation and Amortization	$ 82
Date of Initial Leasehold or Acquisition Investment	2,007
HAWAII | Accumulated Depreciation And Amortization Description [Member] | Honolulu Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,539
Land	1,219
Building and Improvements	320
Total Investment in Real Estate	1,539
Accumulated Depreciation and Amortization	$ 184
Date of Initial Leasehold or Acquisition Investment	2,007
HAWAII | Accumulated Depreciation And Amortization Description [Member] | Honolulu Three [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,769
Land	1,192
Building and Improvements	577
Total Investment in Real Estate	1,769
Accumulated Depreciation and Amortization	$ 310
Date of Initial Leasehold or Acquisition Investment	2,007
HAWAII | Accumulated Depreciation And Amortization Description [Member] | Honolulu Four [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 9,211
Land	8,194
Building and Improvements	1,017
Total Investment in Real Estate	9,211
Accumulated Depreciation and Amortization	$ 562
Date of Initial Leasehold or Acquisition Investment	2,007
HAWAII | Accumulated Depreciation And Amortization Description [Member] | Kaneohe One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,364
Land	822
Building and Improvements	542
Total Investment in Real Estate	1,364
Accumulated Depreciation and Amortization	$ 329
Date of Initial Leasehold or Acquisition Investment	2,007
HAWAII | Accumulated Depreciation And Amortization Description [Member] | Kaneohe Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,977
Cost Capitalized Subsequent to Initial Investment	165
Land	1,473
Building and Improvements	669
Total Investment in Real Estate	2,142
Accumulated Depreciation and Amortization	$ 360
Date of Initial Leasehold or Acquisition Investment	2,007
HAWAII | Accumulated Depreciation And Amortization Description [Member] | Waianae One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,520
Land	648
Building and Improvements	872
Total Investment in Real Estate	1,520
Accumulated Depreciation and Amortization	$ 469
Date of Initial Leasehold or Acquisition Investment	2,007
HAWAII | Accumulated Depreciation And Amortization Description [Member] | Waianae Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,997
Land	871
Building and Improvements	1,126
Total Investment in Real Estate	1,997
Accumulated Depreciation and Amortization	$ 609
Date of Initial Leasehold or Acquisition Investment	2,007
HAWAII | Accumulated Depreciation And Amortization Description [Member] | Waipahu One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 2,458
Land	945
Building and Improvements	1,513
Total Investment in Real Estate	2,458
Accumulated Depreciation and Amortization	$ 789
Date of Initial Leasehold or Acquisition Investment	2,007
ILLINOIS [Member] | Accumulated Depreciation And Amortization Description [Member] | Prospect Heights [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,547
Land	698
Building and Improvements	849
Total Investment in Real Estate	1,547
Accumulated Depreciation and Amortization	$ 28
Date of Initial Leasehold or Acquisition Investment	2,018
LOUISIANA [Member] | Accumulated Depreciation And Amortization Description [Member] | Bossier [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 2,181
Land	1,333
Building and Improvements	848
Total Investment in Real Estate	2,181
Accumulated Depreciation and Amortization	$ 71
Date of Initial Leasehold or Acquisition Investment	2,017
LOUISIANA [Member] | Accumulated Depreciation And Amortization Description [Member] | Lake Charles One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,069
Land	620
Building and Improvements	449
Total Investment in Real Estate	1,069
Accumulated Depreciation and Amortization	$ 18
Date of Initial Leasehold or Acquisition Investment	2,018
LOUISIANA [Member] | Accumulated Depreciation And Amortization Description [Member] | Lake Charles Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,468
Land	1,002
Building and Improvements	466
Total Investment in Real Estate	1,468
Accumulated Depreciation and Amortization	$ 17
Date of Initial Leasehold or Acquisition Investment	2,018
LOUISIANA [Member] | Accumulated Depreciation And Amortization Description [Member] | Sulphur [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 777
Land	375
Building and Improvements	402
Total Investment in Real Estate	777
Accumulated Depreciation and Amortization	$ 18
Date of Initial Leasehold or Acquisition Investment	2,018

Schedule III - Real Estate a_10

Schedule III - Real Estate and Accumulated Depreciation and Amortization Part 8 (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Schedule Of Investments In Real Estate [Line Items]
Total Investment in Real Estate	$ 1,043,106	$ 970,964	$ 782,166	$ 783,233
MASSACHUSETTS [Member] | Accumulated Depreciation And Amortization Description [Member] | Chelmsford One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	715
Building and Improvements	715
Total Investment in Real Estate	715
Accumulated Depreciation and Amortization	$ 325
Date of Initial Leasehold or Acquisition Investment	2,012
MASSACHUSETTS [Member] | Accumulated Depreciation And Amortization Description [Member] | Dracut One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 450
Land	450
Total Investment in Real Estate	$ 450
Date of Initial Leasehold or Acquisition Investment	2,011
MASSACHUSETTS [Member] | Accumulated Depreciation And Amortization Description [Member] | Falmouth One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 414
Cost Capitalized Subsequent to Initial Investment	2,320
Land	458
Building and Improvements	2,276
Total Investment in Real Estate	2,734
Accumulated Depreciation and Amortization	$ 64
Date of Initial Leasehold or Acquisition Investment	1,988
MASSACHUSETTS [Member] | Accumulated Depreciation And Amortization Description [Member] | Fitchburg One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 390
Cost Capitalized Subsequent to Initial Investment	33
Land	254
Building and Improvements	169
Total Investment in Real Estate	423
Accumulated Depreciation and Amortization	$ 118
Date of Initial Leasehold or Acquisition Investment	1,992
MASSACHUSETTS [Member] | Accumulated Depreciation And Amortization Description [Member] | Foxborough One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 427
Cost Capitalized Subsequent to Initial Investment	98
Land	325
Building and Improvements	200
Total Investment in Real Estate	525
Accumulated Depreciation and Amortization	$ 151
Date of Initial Leasehold or Acquisition Investment	1,990
MASSACHUSETTS [Member] | Accumulated Depreciation And Amortization Description [Member] | Framingham One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 400
Cost Capitalized Subsequent to Initial Investment	23
Land	260
Building and Improvements	163
Total Investment in Real Estate	423
Accumulated Depreciation and Amortization	$ 111
Date of Initial Leasehold or Acquisition Investment	1,991
MASSACHUSETTS [Member] | Accumulated Depreciation And Amortization Description [Member] | Gardner One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 550
Land	550
Total Investment in Real Estate	$ 550
Date of Initial Leasehold or Acquisition Investment	2,011
MASSACHUSETTS [Member] | Accumulated Depreciation And Amortization Description [Member] | Gardner Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,009
Cost Capitalized Subsequent to Initial Investment	327
Land	657
Building and Improvements	679
Total Investment in Real Estate	1,336
Accumulated Depreciation and Amortization	$ 494
Date of Initial Leasehold or Acquisition Investment	1,985
MASSACHUSETTS [Member] | Accumulated Depreciation And Amortization Description [Member] | Gardners One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 787
Land	638
Building and Improvements	149
Total Investment in Real Estate	787
Accumulated Depreciation and Amortization	$ 42
Date of Initial Leasehold or Acquisition Investment	2,014
MASSACHUSETTS [Member] | Accumulated Depreciation And Amortization Description [Member] | Hingham One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 353
Cost Capitalized Subsequent to Initial Investment	111
Land	243
Building and Improvements	221
Total Investment in Real Estate	464
Accumulated Depreciation and Amortization	$ 169
Date of Initial Leasehold or Acquisition Investment	1,989
MASSACHUSETTS [Member] | Accumulated Depreciation And Amortization Description [Member] | Hyde Park One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 500
Cost Capitalized Subsequent to Initial Investment	168
Land	322
Building and Improvements	346
Total Investment in Real Estate	668
Accumulated Depreciation and Amortization	$ 235
Date of Initial Leasehold or Acquisition Investment	1,985
MASSACHUSETTS [Member] | Accumulated Depreciation And Amortization Description [Member] | Leominster One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 571
Land	199
Building and Improvements	372
Total Investment in Real Estate	571
Accumulated Depreciation and Amortization	$ 131
Date of Initial Leasehold or Acquisition Investment	2,012
MASSACHUSETTS [Member] | Accumulated Depreciation And Amortization Description [Member] | Littleton One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,357
Land	759
Building and Improvements	598
Total Investment in Real Estate	1,357
Accumulated Depreciation and Amortization	$ 45
Date of Initial Leasehold or Acquisition Investment	2,017
MASSACHUSETTS [Member] | Accumulated Depreciation And Amortization Description [Member] | Lowell Four [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 361
Cost Capitalized Subsequent to Initial Investment	90
Land	201
Building and Improvements	250
Total Investment in Real Estate	451
Accumulated Depreciation and Amortization	$ 247
Date of Initial Leasehold or Acquisition Investment	1,985

Schedule III - Real Estate a_11

Schedule III - Real Estate and Accumulated Depreciation and Amortization Part 9 (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Schedule Of Investments In Real Estate [Line Items]
Total Investment in Real Estate	$ 1,043,106	$ 970,964	$ 782,166	$ 783,233
MASSACHUSETTS [Member] | Accumulated Depreciation And Amortization Description [Member] | Lowell Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Cost Capitalized Subsequent to Initial Investment	631
Land	429
Building and Improvements	202
Total Investment in Real Estate	631
Accumulated Depreciation and Amortization	$ 69
Date of Initial Leasehold or Acquisition Investment	1,996
MASSACHUSETTS [Member] | Accumulated Depreciation And Amortization Description [Member] | Shrewsbury One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 400
Land	400
Total Investment in Real Estate	$ 400
Date of Initial Leasehold or Acquisition Investment	2,011
MASSACHUSETTS [Member] | Accumulated Depreciation And Amortization Description [Member] | Lynn One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 400
Land	400
Total Investment in Real Estate	$ 400
Date of Initial Leasehold or Acquisition Investment	2,011
MASSACHUSETTS [Member] | Accumulated Depreciation And Amortization Description [Member] | Shrewsbury Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 450
Land	450
Total Investment in Real Estate	$ 450
Date of Initial Leasehold or Acquisition Investment	2,011
MASSACHUSETTS [Member] | Accumulated Depreciation And Amortization Description [Member] | Lynn Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 850
Land	850
Total Investment in Real Estate	$ 850
Date of Initial Leasehold or Acquisition Investment	2,011
MASSACHUSETTS [Member] | Accumulated Depreciation And Amortization Description [Member] | Sterling One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 476
Cost Capitalized Subsequent to Initial Investment	2
Land	309
Building and Improvements	169
Total Investment in Real Estate	478
Accumulated Depreciation and Amortization	$ 107
Date of Initial Leasehold or Acquisition Investment	1,991
MASSACHUSETTS [Member] | Accumulated Depreciation And Amortization Description [Member] | Marlborough One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 550
Land	550
Total Investment in Real Estate	$ 550
Date of Initial Leasehold or Acquisition Investment	2,011
MASSACHUSETTS [Member] | Accumulated Depreciation And Amortization Description [Member] | Sutton One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 714
Cost Capitalized Subsequent to Initial Investment	57
Land	464
Building and Improvements	307
Total Investment in Real Estate	771
Accumulated Depreciation and Amortization	$ 214
Date of Initial Leasehold or Acquisition Investment	1,993
MASSACHUSETTS [Member] | Accumulated Depreciation And Amortization Description [Member] | Maynard One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 736
Cost Capitalized Subsequent to Initial Investment	98
Land	479
Building and Improvements	355
Total Investment in Real Estate	834
Accumulated Depreciation and Amortization	$ 258
Date of Initial Leasehold or Acquisition Investment	1,985
MASSACHUSETTS [Member] | Accumulated Depreciation And Amortization Description [Member] | Tewksbury One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 125
Cost Capitalized Subsequent to Initial Investment	545
Land	75
Building and Improvements	595
Total Investment in Real Estate	670
Accumulated Depreciation and Amortization	$ 267
Date of Initial Leasehold or Acquisition Investment	1,986
MASSACHUSETTS [Member] | Accumulated Depreciation And Amortization Description [Member] | Melrose One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 600
Land	600
Total Investment in Real Estate	$ 600
Date of Initial Leasehold or Acquisition Investment	2,011
MASSACHUSETTS [Member] | Accumulated Depreciation And Amortization Description [Member] | Tewksbury Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,200
Land	1,200
Total Investment in Real Estate	$ 1,200
Date of Initial Leasehold or Acquisition Investment	2,011
MASSACHUSETTS [Member] | Accumulated Depreciation And Amortization Description [Member] | Methuen One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 300
Cost Capitalized Subsequent to Initial Investment	134
Land	150
Building and Improvements	284
Total Investment in Real Estate	434
Accumulated Depreciation and Amortization	$ 234
Date of Initial Leasehold or Acquisition Investment	1,986
MASSACHUSETTS [Member] | Accumulated Depreciation And Amortization Description [Member] | Upton One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 429
Cost Capitalized Subsequent to Initial Investment	114
Land	279
Building and Improvements	264
Total Investment in Real Estate	543
Accumulated Depreciation and Amortization	$ 154
Date of Initial Leasehold or Acquisition Investment	1,991
MASSACHUSETTS [Member] | Accumulated Depreciation And Amortization Description [Member] | Methuen Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 380
Cost Capitalized Subsequent to Initial Investment	64
Land	246
Building and Improvements	198
Total Investment in Real Estate	444
Accumulated Depreciation and Amortization	$ 176
Date of Initial Leasehold or Acquisition Investment	1,985
MASSACHUSETTS [Member] | Accumulated Depreciation And Amortization Description [Member] | Wakefield One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 900
Land	900
Total Investment in Real Estate	$ 900
Date of Initial Leasehold or Acquisition Investment	2,011
MASSACHUSETTS [Member] | Accumulated Depreciation And Amortization Description [Member] | Methuen Three [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 490
Cost Capitalized Subsequent to Initial Investment	98
Land	319
Building and Improvements	269
Total Investment in Real Estate	588
Accumulated Depreciation and Amortization	$ 192
Date of Initial Leasehold or Acquisition Investment	1,985
MASSACHUSETTS [Member] | Accumulated Depreciation And Amortization Description [Member] | Walpole One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 450
Cost Capitalized Subsequent to Initial Investment	92
Land	293
Building and Improvements	249
Total Investment in Real Estate	542
Accumulated Depreciation and Amortization	$ 174
Date of Initial Leasehold or Acquisition Investment	1,985
MASSACHUSETTS [Member] | Accumulated Depreciation And Amortization Description [Member] | Methuen Four [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 650
Land	650
Total Investment in Real Estate	$ 650
Date of Initial Leasehold or Acquisition Investment	2,011
MASSACHUSETTS [Member] | Accumulated Depreciation And Amortization Description [Member] | Watertown One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 358
Cost Capitalized Subsequent to Initial Investment	209
Land	321
Building and Improvements	246
Total Investment in Real Estate	567
Accumulated Depreciation and Amortization	$ 171
Date of Initial Leasehold or Acquisition Investment	1,985
MASSACHUSETTS [Member] | Accumulated Depreciation And Amortization Description [Member] | Newton One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 691
Cost Capitalized Subsequent to Initial Investment	98
Land	450
Building and Improvements	339
Total Investment in Real Estate	789
Accumulated Depreciation and Amortization	$ 300
Date of Initial Leasehold or Acquisition Investment	1,985
MASSACHUSETTS [Member] | Accumulated Depreciation And Amortization Description [Member] | Webster One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,012
Cost Capitalized Subsequent to Initial Investment	711
Land	659
Building and Improvements	1,064
Total Investment in Real Estate	1,723
Accumulated Depreciation and Amortization	$ 622
Date of Initial Leasehold or Acquisition Investment	1,985
MASSACHUSETTS [Member] | Accumulated Depreciation And Amortization Description [Member] | Peabody One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 400
Cost Capitalized Subsequent to Initial Investment	18
Land	252
Building and Improvements	166
Total Investment in Real Estate	418
Accumulated Depreciation and Amortization	$ 166
Date of Initial Leasehold or Acquisition Investment	1,986
MASSACHUSETTS [Member] | Accumulated Depreciation And Amortization Description [Member] | West Roxbury One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 490
Cost Capitalized Subsequent to Initial Investment	105
Land	319
Building and Improvements	276
Total Investment in Real Estate	595
Accumulated Depreciation and Amortization	$ 212
Date of Initial Leasehold or Acquisition Investment	1,985
MASSACHUSETTS [Member] | Accumulated Depreciation And Amortization Description [Member] | Peabody Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 550
Land	550
Total Investment in Real Estate	$ 550
Date of Initial Leasehold or Acquisition Investment	2,011
MASSACHUSETTS [Member] | Accumulated Depreciation And Amortization Description [Member] | Westborough One[Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 450
Land	450
Total Investment in Real Estate	$ 450
Date of Initial Leasehold or Acquisition Investment	2,011
MASSACHUSETTS [Member] | Accumulated Depreciation And Amortization Description [Member] | Peabody Three [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 650
Land	650
Total Investment in Real Estate	$ 650
Date of Initial Leasehold or Acquisition Investment	2,011
MASSACHUSETTS [Member] | Accumulated Depreciation And Amortization Description [Member] | Randolph One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 573
Cost Capitalized Subsequent to Initial Investment	238
Land	430
Building and Improvements	381
Total Investment in Real Estate	811
Accumulated Depreciation and Amortization	$ 267
Date of Initial Leasehold or Acquisition Investment	1,985
MASSACHUSETTS [Member] | Accumulated Depreciation And Amortization Description [Member] | Revere One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,300
Land	1,300
Total Investment in Real Estate	$ 1,300
Date of Initial Leasehold or Acquisition Investment	2,011
MASSACHUSETTS [Member] | Accumulated Depreciation And Amortization Description [Member] | Wilmington One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 600
Land	600
Total Investment in Real Estate	$ 600
Date of Initial Leasehold or Acquisition Investment	2,011
MASSACHUSETTS [Member] | Accumulated Depreciation And Amortization Description [Member] | Rockland One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 579
Cost Capitalized Subsequent to Initial Investment	45
Land	377
Building and Improvements	247
Total Investment in Real Estate	624
Accumulated Depreciation and Amortization	$ 214
Date of Initial Leasehold or Acquisition Investment	1,985
MASSACHUSETTS [Member] | Accumulated Depreciation And Amortization Description [Member] | Wilmington Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,300
Land	1,300
Total Investment in Real Estate	$ 1,300
Date of Initial Leasehold or Acquisition Investment	2,011
MASSACHUSETTS [Member] | Accumulated Depreciation And Amortization Description [Member] | Salem One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 600
Land	600
Total Investment in Real Estate	$ 600
Date of Initial Leasehold or Acquisition Investment	2,011
MASSACHUSETTS [Member] | Accumulated Depreciation And Amortization Description [Member] | Seekonk One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,073
Cost Capitalized Subsequent to Initial Investment	(373)
Land	576
Building and Improvements	124
Total Investment in Real Estate	700
Accumulated Depreciation and Amortization	$ 59
Date of Initial Leasehold or Acquisition Investment	1,985

Schedule III - Real Estate a_12

Schedule III - Real Estate and Accumulated Depreciation and Amortization Part 10 (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Schedule Of Investments In Real Estate [Line Items]
Total Investment in Real Estate	$ 1,043,106	$ 970,964	$ 782,166	$ 783,233
MASSACHUSETTS [Member] | Accumulated Depreciation And Amortization Description [Member] | Woburn One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	350
Cost Capitalized Subsequent to Initial Investment	64
Land	200
Building and Improvements	214
Total Investment in Real Estate	414
Accumulated Depreciation and Amortization	$ 204
Date of Initial Leasehold or Acquisition Investment	1,986
MASSACHUSETTS [Member] | Accumulated Depreciation And Amortization Description [Member] | Woburn Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 508
Cost Capitalized Subsequent to Initial Investment	394
Land	508
Building and Improvements	394
Total Investment in Real Estate	902
Accumulated Depreciation and Amortization	$ 292
Date of Initial Leasehold or Acquisition Investment	1,985
MASSACHUSETTS [Member] | Accumulated Depreciation And Amortization Description [Member] | Worcester One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 400
Land	400
Total Investment in Real Estate	$ 400
Date of Initial Leasehold or Acquisition Investment	2,011
MASSACHUSETTS [Member] | Accumulated Depreciation And Amortization Description [Member] | Worcester Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 500
Land	500
Total Investment in Real Estate	$ 500
Date of Initial Leasehold or Acquisition Investment	2,011
MASSACHUSETTS [Member] | Accumulated Depreciation And Amortization Description [Member] | Worcester Three [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 550
Land	550
Total Investment in Real Estate	$ 550
Date of Initial Leasehold or Acquisition Investment	2,011
MASSACHUSETTS [Member] | Accumulated Depreciation And Amortization Description [Member] | Worcester Four [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 548
Cost Capitalized Subsequent to Initial Investment	10
Land	356
Building and Improvements	202
Total Investment in Real Estate	558
Accumulated Depreciation and Amortization	$ 130
Date of Initial Leasehold or Acquisition Investment	1,991
MASSACHUSETTS [Member] | Accumulated Depreciation And Amortization Description [Member] | Worcester Five [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 498
Cost Capitalized Subsequent to Initial Investment	383
Land	322
Building and Improvements	559
Total Investment in Real Estate	881
Accumulated Depreciation and Amortization	$ 329
Date of Initial Leasehold or Acquisition Investment	1,985
MASSACHUSETTS [Member] | Accumulated Depreciation And Amortization Description [Member] | Worcester Six [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 978
Cost Capitalized Subsequent to Initial Investment	8
Land	636
Building and Improvements	350
Total Investment in Real Estate	986
Accumulated Depreciation and Amortization	$ 222
Date of Initial Leasehold or Acquisition Investment	1,991
MARYLAND [Member] | Accumulated Depreciation And Amortization Description [Member] | Accokeek One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 692
Land	692
Total Investment in Real Estate	$ 692
Date of Initial Leasehold or Acquisition Investment	2,010
MARYLAND [Member] | Accumulated Depreciation And Amortization Description [Member] | Baltimore One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 802
Building and Improvements	802
Total Investment in Real Estate	802
Accumulated Depreciation and Amortization	$ 473
Date of Initial Leasehold or Acquisition Investment	2,007
MARYLAND [Member] | Accumulated Depreciation And Amortization Description [Member] | Baltimore Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 2,259
Land	722
Building and Improvements	1,537
Total Investment in Real Estate	2,259
Accumulated Depreciation and Amortization	$ 814
Date of Initial Leasehold or Acquisition Investment	2,007
MARYLAND [Member] | Accumulated Depreciation And Amortization Description [Member] | Worchester One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 196
Cost Capitalized Subsequent to Initial Investment	812
Building and Improvements	1,008
Total Investment in Real Estate	1,008
Accumulated Depreciation and Amortization	$ 29
Date of Initial Leasehold or Acquisition Investment	2,017
MARYLAND [Member] | Accumulated Depreciation And Amortization Description [Member] | Beltsville Five [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 525
Land	525
Total Investment in Real Estate	$ 525
Date of Initial Leasehold or Acquisition Investment	2,009

Schedule III - Real Estate a_13

Schedule III - Real Estate and Accumulated Depreciation and Amortization Part 12 (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Schedule Of Investments In Real Estate [Line Items]
Total Investment in Real Estate	$ 1,043,106	$ 970,964	$ 782,166	$ 783,233
MARYLAND [Member] | Accumulated Depreciation And Amortization Description [Member] | Beltsville One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	731
Land	731
Total Investment in Real Estate	$ 731
Date of Initial Leasehold or Acquisition Investment	2,009
MARYLAND [Member] | Accumulated Depreciation And Amortization Description [Member] | Greenbelt One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,153
Land	1,153
Total Investment in Real Estate	$ 1,153
Date of Initial Leasehold or Acquisition Investment	2,009
MARYLAND [Member] | Accumulated Depreciation And Amortization Description [Member] | Beltsville Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,050
Land	1,050
Total Investment in Real Estate	$ 1,050
Date of Initial Leasehold or Acquisition Investment	2,009
MARYLAND [Member] | Accumulated Depreciation And Amortization Description [Member] | Hyattsville One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 491
Land	491
Total Investment in Real Estate	$ 491
Date of Initial Leasehold or Acquisition Investment	2,009
MARYLAND [Member] | Accumulated Depreciation And Amortization Description [Member] | Beltsville Three [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,130
Land	1,130
Total Investment in Real Estate	$ 1,130
Date of Initial Leasehold or Acquisition Investment	2,009
MARYLAND [Member] | Accumulated Depreciation And Amortization Description [Member] | Hyattsville Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 594
Land	594
Total Investment in Real Estate	$ 594
Date of Initial Leasehold or Acquisition Investment	2,009
MARYLAND [Member] | Accumulated Depreciation And Amortization Description [Member] | Landover Hills One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 457
Land	457
Total Investment in Real Estate	$ 457
Date of Initial Leasehold or Acquisition Investment	2,009
MARYLAND [Member] | Accumulated Depreciation And Amortization Description [Member] | Bladensburg One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 571
Land	571
Total Investment in Real Estate	$ 571
Date of Initial Leasehold or Acquisition Investment	2,009
MARYLAND [Member] | Accumulated Depreciation And Amortization Description [Member] | Landover Hills Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,358
Land	1,358
Total Investment in Real Estate	$ 1,358
Date of Initial Leasehold or Acquisition Investment	2,009
MARYLAND [Member] | Accumulated Depreciation And Amortization Description [Member] | Bowie One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,084
Land	1,084
Total Investment in Real Estate	$ 1,084
Date of Initial Leasehold or Acquisition Investment	2,009
MARYLAND [Member] | Accumulated Depreciation And Amortization Description [Member] | Landover One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 662
Land	662
Total Investment in Real Estate	$ 662
Date of Initial Leasehold or Acquisition Investment	2,009
MARYLAND [Member] | Accumulated Depreciation And Amortization Description [Member] | Capitol Heights One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 628
Land	628
Total Investment in Real Estate	$ 628
Date of Initial Leasehold or Acquisition Investment	2,009
MARYLAND [Member] | Accumulated Depreciation And Amortization Description [Member] | Clinton One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 651
Land	651
Total Investment in Real Estate	$ 651
Date of Initial Leasehold or Acquisition Investment	2,009
MARYLAND [Member] | Accumulated Depreciation And Amortization Description [Member] | Lanham One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 822
Land	822
Total Investment in Real Estate	$ 822
Date of Initial Leasehold or Acquisition Investment	2,009
MARYLAND [Member] | Accumulated Depreciation And Amortization Description [Member] | College Park One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 445
Land	445
Total Investment in Real Estate	$ 445
Date of Initial Leasehold or Acquisition Investment	2,009
MARYLAND [Member] | Accumulated Depreciation And Amortization Description [Member] | Laurel One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 696
Land	696
Total Investment in Real Estate	$ 696
Date of Initial Leasehold or Acquisition Investment	2,009
MARYLAND [Member] | Accumulated Depreciation And Amortization Description [Member] | College Park Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 536
Land	536
Total Investment in Real Estate	$ 536
Date of Initial Leasehold or Acquisition Investment	2,009
MARYLAND [Member] | Accumulated Depreciation And Amortization Description [Member] | Laurel Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,210
Land	1,210
Total Investment in Real Estate	$ 1,210
Date of Initial Leasehold or Acquisition Investment	2,009
MARYLAND [Member] | Accumulated Depreciation And Amortization Description [Member] | District Heights One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 479
Land	479
Total Investment in Real Estate	$ 479
Date of Initial Leasehold or Acquisition Investment	2,009
MARYLAND [Member] | Accumulated Depreciation And Amortization Description [Member] | Laurel Three [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,267
Land	1,267
Total Investment in Real Estate	$ 1,267
Date of Initial Leasehold or Acquisition Investment	2,009
MARYLAND [Member] | Accumulated Depreciation And Amortization Description [Member] | Laurel Four [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,415
Land	1,415
Total Investment in Real Estate	$ 1,415
Date of Initial Leasehold or Acquisition Investment	2,009
MARYLAND [Member] | Accumulated Depreciation And Amortization Description [Member] | Ellicott City One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 895
Building and Improvements	895
Total Investment in Real Estate	895
Accumulated Depreciation and Amortization	$ 555
Date of Initial Leasehold or Acquisition Investment	2,007
MARYLAND [Member] | Accumulated Depreciation And Amortization Description [Member] | Laurel Five [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,530
Land	1,530
Total Investment in Real Estate	$ 1,530
Date of Initial Leasehold or Acquisition Investment	2,009
MARYLAND [Member] | Accumulated Depreciation And Amortization Description [Member] | Forestville One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,039
Land	1,039
Total Investment in Real Estate	$ 1,039
Date of Initial Leasehold or Acquisition Investment	2,009
MARYLAND [Member] | Accumulated Depreciation And Amortization Description [Member] | Laurel Six [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 2,523
Land	2,523
Total Investment in Real Estate	$ 2,523
Date of Initial Leasehold or Acquisition Investment	2,009
MARYLAND [Member] | Accumulated Depreciation And Amortization Description [Member] | Fort Washington One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 422
Land	422
Total Investment in Real Estate	$ 422
Date of Initial Leasehold or Acquisition Investment	2,009
MARYLAND [Member] | Accumulated Depreciation And Amortization Description [Member] | Oxon Hill One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,256
Land	1,256
Total Investment in Real Estate	$ 1,256
Date of Initial Leasehold or Acquisition Investment	2,009
MARYLAND [Member] | Accumulated Depreciation And Amortization Description [Member] | Riverdale One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 582
Land	582
Total Investment in Real Estate	$ 582
Date of Initial Leasehold or Acquisition Investment	2,009
MARYLAND [Member] | Accumulated Depreciation And Amortization Description [Member] | Seat Pleasant One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 468
Land	468
Total Investment in Real Estate	$ 468
Date of Initial Leasehold or Acquisition Investment	2,009
MARYLAND [Member] | Accumulated Depreciation And Amortization Description [Member] | Suitland One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 673
Land	673
Total Investment in Real Estate	$ 673
Date of Initial Leasehold or Acquisition Investment	2,009
MARYLAND [Member] | Accumulated Depreciation And Amortization Description [Member] | Landover Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 753
Land	753
Total Investment in Real Estate	$ 753
Date of Initial Leasehold or Acquisition Investment	2,009
MARYLAND [Member] | Accumulated Depreciation And Amortization Description [Member] | Upper Marlboro One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 845
Land	845
Total Investment in Real Estate	$ 845
Date of Initial Leasehold or Acquisition Investment	2,009
MAINE [Member] | Accumulated Depreciation And Amortization Description [Member] | Biddeford One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 618
Cost Capitalized Subsequent to Initial Investment	8
Land	235
Building and Improvements	391
Total Investment in Real Estate	626
Accumulated Depreciation and Amortization	$ 391
Date of Initial Leasehold or Acquisition Investment	1,985
MAINE [Member] | Accumulated Depreciation And Amortization Description [Member] | Lewiston One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 342
Cost Capitalized Subsequent to Initial Investment	188
Land	222
Building and Improvements	308
Total Investment in Real Estate	530
Accumulated Depreciation and Amortization	$ 229
Date of Initial Leasehold or Acquisition Investment	1,985
NORTH CAROLINA [Member] | Accumulated Depreciation And Amortization Description [Member] | Kernersville One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 449
Land	338
Building and Improvements	111
Total Investment in Real Estate	449
Accumulated Depreciation and Amortization	$ 105
Date of Initial Leasehold or Acquisition Investment	2,007
NORTH CAROLINA [Member] | Accumulated Depreciation And Amortization Description [Member] | Davidson [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,776
Land	301
Building and Improvements	1,475
Total Investment in Real Estate	1,776
Accumulated Depreciation and Amortization	$ 79
Date of Initial Leasehold or Acquisition Investment	2,017
NORTH CAROLINA [Member] | Accumulated Depreciation And Amortization Description [Member] | Fayetteville Three [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 986
Land	509
Building and Improvements	477
Total Investment in Real Estate	986
Accumulated Depreciation and Amortization	$ 19
Date of Initial Leasehold or Acquisition Investment	2,018

Schedule III - Real Estate a_14

Schedule III - Real Estate and Accumulated Depreciation and Amortization Part 13 (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Schedule Of Investments In Real Estate [Line Items]
Total Investment in Real Estate	$ 1,043,106	$ 970,964	$ 782,166	$ 783,233
NORTH CAROLINA [Member] | Accumulated Depreciation And Amortization Description [Member] | New Bern One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	350
Cost Capitalized Subsequent to Initial Investment	83
Land	190
Building and Improvements	243
Total Investment in Real Estate	433
Accumulated Depreciation and Amortization	$ 168
Date of Initial Leasehold or Acquisition Investment	2,007
NORTH DAKOTA [Member] | Accumulated Depreciation And Amortization Description [Member] | Belfield One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,232
Land	382
Building and Improvements	850
Total Investment in Real Estate	1,232
Accumulated Depreciation and Amortization	$ 753
Date of Initial Leasehold or Acquisition Investment	2,007
NEW HAMPSHIRE [Member] | Accumulated Depreciation And Amortization Description [Member] | Allenstown One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,787
Land	467
Building and Improvements	1,320
Total Investment in Real Estate	1,787
Accumulated Depreciation and Amortization	$ 759
Date of Initial Leasehold or Acquisition Investment	2,007
NEW HAMPSHIRE [Member] | Accumulated Depreciation And Amortization Description [Member] | Concord One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 675
Land	675
Total Investment in Real Estate	$ 675
Date of Initial Leasehold or Acquisition Investment	2,011
NEW HAMPSHIRE [Member] | Accumulated Depreciation And Amortization Description [Member] | Concord Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 900
Land	900
Total Investment in Real Estate	$ 900
Date of Initial Leasehold or Acquisition Investment	2,011
NEW HAMPSHIRE [Member] | Accumulated Depreciation And Amortization Description [Member] | Derry One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 418
Cost Capitalized Subsequent to Initial Investment	17
Land	158
Building and Improvements	277
Total Investment in Real Estate	435
Accumulated Depreciation and Amortization	$ 276
Date of Initial Leasehold or Acquisition Investment	1,987
NEW HAMPSHIRE [Member] | Accumulated Depreciation And Amortization Description [Member] | Derry [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 950
Land	950
Total Investment in Real Estate	$ 950
Date of Initial Leasehold or Acquisition Investment	2,011
NEW HAMPSHIRE [Member] | Accumulated Depreciation And Amortization Description [Member] | Dover One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 650
Land	650
Total Investment in Real Estate	$ 650
Date of Initial Leasehold or Acquisition Investment	2,011
NEW HAMPSHIRE [Member] | Accumulated Depreciation And Amortization Description [Member] | Dover Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,200
Land	1,200
Total Investment in Real Estate	$ 1,200
Date of Initial Leasehold or Acquisition Investment	2,011
NEW HAMPSHIRE [Member] | Accumulated Depreciation And Amortization Description [Member] | Goffstown One
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,737
Land	697
Building and Improvements	1,040
Total Investment in Real Estate	1,737
Accumulated Depreciation and Amortization	$ 457
Date of Initial Leasehold or Acquisition Investment	2,012
NEW HAMPSHIRE [Member] | Accumulated Depreciation And Amortization Description [Member] | Nashua Six [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,750
Land	1,750
Total Investment in Real Estate	$ 1,750
Date of Initial Leasehold or Acquisition Investment	2,011
NEW HAMPSHIRE [Member] | Accumulated Depreciation And Amortization Description [Member] | Northwood One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 500
Land	500
Total Investment in Real Estate	$ 500
Date of Initial Leasehold or Acquisition Investment	2,011
NEW HAMPSHIRE [Member] | Accumulated Depreciation And Amortization Description [Member] | Pelham One [Member]
Schedule Of Investments In Real Estate [Line Items]
Cost Capitalized Subsequent to Initial Investment	$ 730
Land	317
Building and Improvements	413
Total Investment in Real Estate	730
Accumulated Depreciation and Amortization	$ 120
Date of Initial Leasehold or Acquisition Investment	1,996
NEW HAMPSHIRE [Member] | Accumulated Depreciation And Amortization Description [Member] | Plaistow One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 300
Cost Capitalized Subsequent to Initial Investment	101
Land	245
Building and Improvements	156
Total Investment in Real Estate	401
Accumulated Depreciation and Amortization	$ 156
Date of Initial Leasehold or Acquisition Investment	1,987
NEW HAMPSHIRE [Member] | Accumulated Depreciation And Amortization Description [Member] | Hooksett One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,562
Land	824
Building and Improvements	738
Total Investment in Real Estate	1,562
Accumulated Depreciation and Amortization	$ 671
Date of Initial Leasehold or Acquisition Investment	2,007
NEW HAMPSHIRE [Member] | Accumulated Depreciation And Amortization Description [Member] | Portsmouth One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 525
Land	525
Total Investment in Real Estate	$ 525
Date of Initial Leasehold or Acquisition Investment	2,011
NEW HAMPSHIRE [Member] | Accumulated Depreciation And Amortization Description [Member] | Kingston One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,500
Land	1,500
Total Investment in Real Estate	$ 1,500
Date of Initial Leasehold or Acquisition Investment	2,011
NEW HAMPSHIRE [Member] | Accumulated Depreciation And Amortization Description [Member] | Raymond One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 550
Land	550
Total Investment in Real Estate	$ 550
Date of Initial Leasehold or Acquisition Investment	2,011
NEW HAMPSHIRE [Member] | Accumulated Depreciation And Amortization Description [Member] | Londonderry One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 703
Cost Capitalized Subsequent to Initial Investment	30
Land	458
Building and Improvements	275
Total Investment in Real Estate	733
Accumulated Depreciation and Amortization	$ 235
Date of Initial Leasehold or Acquisition Investment	1,985
NEW HAMPSHIRE [Member] | Accumulated Depreciation And Amortization Description [Member] | Rochester One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 700
Land	700
Total Investment in Real Estate	$ 700
Date of Initial Leasehold or Acquisition Investment	2,011
NEW HAMPSHIRE [Member] | Accumulated Depreciation And Amortization Description [Member] | Londonderry Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,100
Land	1,100
Total Investment in Real Estate	$ 1,100
Date of Initial Leasehold or Acquisition Investment	2,011
NEW HAMPSHIRE [Member] | Accumulated Depreciation And Amortization Description [Member] | Rochester Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 939
Cost Capitalized Subsequent to Initial Investment	12
Land	600
Building and Improvements	351
Total Investment in Real Estate	951
Accumulated Depreciation and Amortization	$ 296
Date of Initial Leasehold or Acquisition Investment	1,985
NEW HAMPSHIRE [Member] | Accumulated Depreciation And Amortization Description [Member] | Manchester One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 550
Land	550
Total Investment in Real Estate	$ 550
Date of Initial Leasehold or Acquisition Investment	2,011
NEW HAMPSHIRE [Member] | Accumulated Depreciation And Amortization Description [Member] | Rochester Three [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,400
Land	1,400
Total Investment in Real Estate	$ 1,400
Date of Initial Leasehold or Acquisition Investment	2,011
NEW HAMPSHIRE [Member] | Accumulated Depreciation And Amortization Description [Member] | Nashua One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 500
Land	500
Total Investment in Real Estate	$ 500
Date of Initial Leasehold or Acquisition Investment	2,011
NEW HAMPSHIRE [Member] | Accumulated Depreciation And Amortization Description [Member] | Rochester Four [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,600
Land	1,600
Total Investment in Real Estate	$ 1,600
Date of Initial Leasehold or Acquisition Investment	2,011
NEW HAMPSHIRE [Member] | Accumulated Depreciation And Amortization Description [Member] | Nashua Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 550
Land	550
Total Investment in Real Estate	$ 550
Date of Initial Leasehold or Acquisition Investment	2,011
NEW HAMPSHIRE [Member] | Accumulated Depreciation And Amortization Description [Member] | Nashua Three [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 750
Land	750
Total Investment in Real Estate	$ 750
Date of Initial Leasehold or Acquisition Investment	2,011
NEW HAMPSHIRE [Member] | Accumulated Depreciation And Amortization Description [Member] | Nashua Four [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 825
Land	825
Total Investment in Real Estate	$ 825
Date of Initial Leasehold or Acquisition Investment	2,011
NEW HAMPSHIRE [Member] | Accumulated Depreciation And Amortization Description [Member] | Nashua Five [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,132
Land	780
Building and Improvements	352
Total Investment in Real Estate	1,132
Accumulated Depreciation and Amortization	$ 33
Date of Initial Leasehold or Acquisition Investment	2,017

Schedule III - Real Estate a_15

Schedule III - Real Estate and Accumulated Depreciation and Amortization Part 14 (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Schedule Of Investments In Real Estate [Line Items]
Total Investment in Real Estate	$ 1,043,106	$ 970,964	$ 782,166	$ 783,233
NEW HAMPSHIRE [Member] | Accumulated Depreciation And Amortization Description [Member] | Salem One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	743
Cost Capitalized Subsequent to Initial Investment	20
Land	484
Building and Improvements	279
Total Investment in Real Estate	763
Accumulated Depreciation and Amortization	$ 236
Date of Initial Leasehold or Acquisition Investment	1,985
NEW HAMPSHIRE [Member] | Accumulated Depreciation And Amortization Description [Member] | Salem Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 450
Cost Capitalized Subsequent to Initial Investment	871
Land	350
Building and Improvements	971
Total Investment in Real Estate	1,321
Accumulated Depreciation and Amortization	$ 122
Date of Initial Leasehold or Acquisition Investment	1,986
NJ [Member] | Accumulated Depreciation And Amortization Description [Member] | Basking Ridge One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 363
Cost Capitalized Subsequent to Initial Investment	284
Land	200
Building and Improvements	447
Total Investment in Real Estate	647
Accumulated Depreciation and Amortization	$ 278
Date of Initial Leasehold or Acquisition Investment	1,986
NJ [Member] | Accumulated Depreciation And Amortization Description [Member] | Bergenfield One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 381
Cost Capitalized Subsequent to Initial Investment	323
Land	300
Building and Improvements	404
Total Investment in Real Estate	704
Accumulated Depreciation and Amortization	$ 225
Date of Initial Leasehold or Acquisition Investment	1,990
NJ [Member] | Accumulated Depreciation And Amortization Description [Member] | Brick One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,508
Cost Capitalized Subsequent to Initial Investment	229
Land	1,000
Building and Improvements	737
Total Investment in Real Estate	1,737
Accumulated Depreciation and Amortization	$ 509
Date of Initial Leasehold or Acquisition Investment	2,000
NJ [Member] | Accumulated Depreciation And Amortization Description [Member] | Colonia One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 719
Cost Capitalized Subsequent to Initial Investment	(299)
Land	72
Building and Improvements	348
Total Investment in Real Estate	420
Accumulated Depreciation and Amortization	$ 282
Date of Initial Leasehold or Acquisition Investment	1,985
NJ [Member] | Accumulated Depreciation And Amortization Description [Member] | Elizabeth One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 406
Cost Capitalized Subsequent to Initial Investment	33
Land	227
Building and Improvements	212
Total Investment in Real Estate	439
Accumulated Depreciation and Amortization	$ 188
Date of Initial Leasehold or Acquisition Investment	1,985
NJ [Member] | Accumulated Depreciation And Amortization Description [Member] | Flemington One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 709
Cost Capitalized Subsequent to Initial Investment	(252)
Land	168
Building and Improvements	289
Total Investment in Real Estate	457
Accumulated Depreciation and Amortization	$ 120
Date of Initial Leasehold or Acquisition Investment	1,985
NJ [Member] | Accumulated Depreciation And Amortization Description [Member] | Flemington Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 547
Cost Capitalized Subsequent to Initial Investment	17
Land	346
Building and Improvements	218
Total Investment in Real Estate	564
Accumulated Depreciation and Amortization	$ 185
Date of Initial Leasehold or Acquisition Investment	1,985
NJ [Member] | Accumulated Depreciation And Amortization Description [Member] | Fort Lee One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,245
Cost Capitalized Subsequent to Initial Investment	365
Land	811
Building and Improvements	799
Total Investment in Real Estate	1,610
Accumulated Depreciation and Amortization	$ 538
Date of Initial Leasehold or Acquisition Investment	1,985
NJ [Member] | Accumulated Depreciation And Amortization Description [Member] | Franklin Twp One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 684
Cost Capitalized Subsequent to Initial Investment	169
Land	445
Building and Improvements	408
Total Investment in Real Estate	853
Accumulated Depreciation and Amortization	$ 352
Date of Initial Leasehold or Acquisition Investment	1,985
NJ [Member] | Accumulated Depreciation And Amortization Description [Member] | Freehold One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 495
Cost Capitalized Subsequent to Initial Investment	533
Land	95
Building and Improvements	933
Total Investment in Real Estate	1,028
Accumulated Depreciation and Amortization	$ 170
Date of Initial Leasehold or Acquisition Investment	1,978
NJ [Member] | Accumulated Depreciation And Amortization Description [Member] | Hasbrouck Heights One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 640
Cost Capitalized Subsequent to Initial Investment	483
Land	416
Building and Improvements	707
Total Investment in Real Estate	1,123
Accumulated Depreciation and Amortization	$ 449
Date of Initial Leasehold or Acquisition Investment	1,985
NJ [Member] | Accumulated Depreciation And Amortization Description [Member] | Hillsborough One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 238
Cost Capitalized Subsequent to Initial Investment	182
Land	100
Building and Improvements	320
Total Investment in Real Estate	420
Accumulated Depreciation and Amortization	$ 245
Date of Initial Leasehold or Acquisition Investment	1,985
NJ [Member] | Accumulated Depreciation And Amortization Description [Member] | Lake Hopatcong One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,305
Land	800
Building and Improvements	505
Total Investment in Real Estate	1,305
Accumulated Depreciation and Amortization	$ 436
Date of Initial Leasehold or Acquisition Investment	2,000
NJ [Member] | Accumulated Depreciation And Amortization Description [Member] | Livingston One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 872
Cost Capitalized Subsequent to Initial Investment	292
Land	568
Building and Improvements	596
Total Investment in Real Estate	1,164
Accumulated Depreciation and Amortization	$ 391
Date of Initial Leasehold or Acquisition Investment	1,985
NJ [Member] | Accumulated Depreciation And Amortization Description [Member] | Long Branch One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 515
Cost Capitalized Subsequent to Initial Investment	439
Land	335
Building and Improvements	619
Total Investment in Real Estate	954
Accumulated Depreciation and Amortization	$ 323
Date of Initial Leasehold or Acquisition Investment	1,985
NJ [Member] | Accumulated Depreciation And Amortization Description [Member] | Mcafee One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 671
Cost Capitalized Subsequent to Initial Investment	448
Land	437
Building and Improvements	682
Total Investment in Real Estate	1,119
Accumulated Depreciation and Amortization	$ 342
Date of Initial Leasehold or Acquisition Investment	1,985
NJ [Member] | Accumulated Depreciation And Amortization Description [Member] | Midland Park One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 201
Cost Capitalized Subsequent to Initial Investment	309
Land	150
Building and Improvements	360
Total Investment in Real Estate	510
Accumulated Depreciation and Amortization	$ 208
Date of Initial Leasehold or Acquisition Investment	1,989
NJ [Member] | Accumulated Depreciation And Amortization Description [Member] | Mountainside One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 664
Cost Capitalized Subsequent to Initial Investment	(197)
Land	134
Building and Improvements	333
Total Investment in Real Estate	467
Accumulated Depreciation and Amortization	$ 152
Date of Initial Leasehold or Acquisition Investment	1,985
NJ [Member] | Accumulated Depreciation And Amortization Description [Member] | North Bergen One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 630
Cost Capitalized Subsequent to Initial Investment	147
Land	410
Building and Improvements	367
Total Investment in Real Estate	777
Accumulated Depreciation and Amortization	$ 296
Date of Initial Leasehold or Acquisition Investment	1,985
NJ [Member] | Accumulated Depreciation And Amortization Description [Member] | North Plainfield One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 227
Cost Capitalized Subsequent to Initial Investment	544
Land	175
Building and Improvements	596
Total Investment in Real Estate	771
Accumulated Depreciation and Amortization	$ 448
Date of Initial Leasehold or Acquisition Investment	1,978
NJ [Member] | Accumulated Depreciation And Amortization Description [Member] | Paramus One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 382
Cost Capitalized Subsequent to Initial Investment	81
Land	249
Building and Improvements	214
Total Investment in Real Estate	463
Accumulated Depreciation and Amortization	$ 150
Date of Initial Leasehold or Acquisition Investment	1,985
NJ [Member] | Accumulated Depreciation And Amortization Description [Member] | Parlin [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 418
Cost Capitalized Subsequent to Initial Investment	159
Land	203
Building and Improvements	374
Total Investment in Real Estate	577
Accumulated Depreciation and Amortization	$ 158
Date of Initial Leasehold or Acquisition Investment	1,985
NJ [Member] | Accumulated Depreciation And Amortization Description [Member] | Paterson One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 619
Cost Capitalized Subsequent to Initial Investment	17
Land	403
Building and Improvements	233
Total Investment in Real Estate	636
Accumulated Depreciation and Amortization	$ 198
Date of Initial Leasehold or Acquisition Investment	1,985
NJ [Member] | Accumulated Depreciation And Amortization Description [Member] | Ridgewood [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 703
Cost Capitalized Subsequent to Initial Investment	398
Land	458
Building and Improvements	643
Total Investment in Real Estate	1,101
Accumulated Depreciation and Amortization	$ 395
Date of Initial Leasehold or Acquisition Investment	1,985
NJ [Member] | Accumulated Depreciation And Amortization Description [Member] | Trenton One
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,303
Land	1,146
Building and Improvements	157
Total Investment in Real Estate	1,303
Accumulated Depreciation and Amortization	$ 58
Date of Initial Leasehold or Acquisition Investment	2,012
NJ [Member] | Accumulated Depreciation And Amortization Description [Member] | Union One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 437
Cost Capitalized Subsequent to Initial Investment	214
Land	239
Building and Improvements	412
Total Investment in Real Estate	651
Accumulated Depreciation and Amortization	$ 192
Date of Initial Leasehold or Acquisition Investment	1,985
NJ [Member] | Accumulated Depreciation And Amortization Description [Member] | Washington One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 912
Cost Capitalized Subsequent to Initial Investment	334
Land	594
Building and Improvements	652
Total Investment in Real Estate	1,246
Accumulated Depreciation and Amortization	$ 394
Date of Initial Leasehold or Acquisition Investment	1,985
NJ [Member] | Accumulated Depreciation And Amortization Description [Member] | Watchung One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 449
Cost Capitalized Subsequent to Initial Investment	114
Land	226
Building and Improvements	337
Total Investment in Real Estate	563
Accumulated Depreciation and Amortization	$ 140
Date of Initial Leasehold or Acquisition Investment	1,985
NJ [Member] | Accumulated Depreciation And Amortization Description [Member] | West Orange One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 800
Cost Capitalized Subsequent to Initial Investment	409
Land	521
Building and Improvements	688
Total Investment in Real Estate	1,209
Accumulated Depreciation and Amortization	$ 475
Date of Initial Leasehold or Acquisition Investment	1,985
NEW MEXICO [Member] | Accumulated Depreciation And Amortization Description [Member] | Bernalillo One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,829
Land	1,382
Building and Improvements	447
Total Investment in Real Estate	1,829
Accumulated Depreciation and Amortization	$ 37
Date of Initial Leasehold or Acquisition Investment	2,017
NEW MEXICO [Member] | Accumulated Depreciation And Amortization Description [Member] | Bernalillo Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 2,308
Land	1,830
Building and Improvements	478
Total Investment in Real Estate	2,308
Accumulated Depreciation and Amortization	$ 43
Date of Initial Leasehold or Acquisition Investment	2,017
NEW MEXICO [Member] | Accumulated Depreciation And Amortization Description [Member] | Bernalillo Three [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 2,322
Land	1,796
Building and Improvements	526
Total Investment in Real Estate	2,322
Accumulated Depreciation and Amortization	$ 45
Date of Initial Leasehold or Acquisition Investment	2,017
NEW MEXICO [Member] | Accumulated Depreciation And Amortization Description [Member] | Bernalillo Four [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 3,682
Land	3,141
Building and Improvements	541
Total Investment in Real Estate	3,682
Accumulated Depreciation and Amortization	$ 48
Date of Initial Leasehold or Acquisition Investment	2,017
NEW MEXICO [Member] | Accumulated Depreciation And Amortization Description [Member] | Dona Ana [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,842
Land	1,374
Building and Improvements	468
Total Investment in Real Estate	1,842
Accumulated Depreciation and Amortization	$ 40
Date of Initial Leasehold or Acquisition Investment	2,017
NEVADA [Member] | Accumulated Depreciation And Amortization Description [Member] | Fernley One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,665
Land	221
Building and Improvements	1,444
Total Investment in Real Estate	1,665
Accumulated Depreciation and Amortization	$ 366
Date of Initial Leasehold or Acquisition Investment	2,015
NEW YORK | Accumulated Depreciation And Amortization Description [Member] | Alfred Station One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 714
Land	414
Building and Improvements	300
Total Investment in Real Estate	714
Accumulated Depreciation and Amortization	$ 154
Date of Initial Leasehold or Acquisition Investment	2,006
NEW YORK | Accumulated Depreciation And Amortization Description [Member] | Amherst One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 223
Cost Capitalized Subsequent to Initial Investment	246
Land	173
Building and Improvements	296
Total Investment in Real Estate	469
Accumulated Depreciation and Amortization	$ 141
Date of Initial Leasehold or Acquisition Investment	2,000
NEW YORK | Accumulated Depreciation And Amortization Description [Member] | Astoria One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,684
Land	1,105
Building and Improvements	579
Total Investment in Real Estate	1,684
Accumulated Depreciation and Amortization	$ 188
Date of Initial Leasehold or Acquisition Investment	2,013
NEW YORK | Accumulated Depreciation And Amortization Description [Member] | Avoca One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 936
Cost Capitalized Subsequent to Initial Investment	(1)
Land	635
Building and Improvements	300
Total Investment in Real Estate	935
Accumulated Depreciation and Amortization	$ 154
Date of Initial Leasehold or Acquisition Investment	2,006
NEW YORK | Accumulated Depreciation And Amortization Description [Member] | Batavia One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 684
Land	364
Building and Improvements	320
Total Investment in Real Estate	684
Accumulated Depreciation and Amortization	$ 164
Date of Initial Leasehold or Acquisition Investment	2,006
NEW YORK | Accumulated Depreciation And Amortization Description [Member] | Bay Shore One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 157
Cost Capitalized Subsequent to Initial Investment	355
Land	86
Building and Improvements	426
Total Investment in Real Estate	512
Accumulated Depreciation and Amortization	$ 286
Date of Initial Leasehold or Acquisition Investment	1,981
NEW YORK | Accumulated Depreciation And Amortization Description [Member] | Bayside One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 470
Cost Capitalized Subsequent to Initial Investment	254
Land	306
Building and Improvements	418
Total Investment in Real Estate	724
Accumulated Depreciation and Amortization	$ 227
Date of Initial Leasehold or Acquisition Investment	1,985

Schedule III - Real Estate a_16

Schedule III - Real Estate and Accumulated Depreciation and Amortization Part 15 (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Schedule Of Investments In Real Estate [Line Items]
Total Investment in Real Estate	$ 1,043,106	$ 970,964	$ 782,166	$ 783,233
Accumulated Depreciation And Amortization Description [Member] | NEW YORK | Brewster One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	789
Land	789
Total Investment in Real Estate	$ 789
Date of Initial Leasehold or Acquisition Investment	2,011
Accumulated Depreciation And Amortization Description [Member] | NEW YORK | Briarcliff Manor One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 652
Cost Capitalized Subsequent to Initial Investment	553
Land	502
Building and Improvements	703
Total Investment in Real Estate	1,205
Accumulated Depreciation and Amortization	$ 515
Date of Initial Leasehold or Acquisition Investment	1,976
Accumulated Depreciation And Amortization Description [Member] | NEW YORK | Bronx One
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 423
Land	423
Total Investment in Real Estate	$ 423
Date of Initial Leasehold or Acquisition Investment	2,013
Accumulated Depreciation And Amortization Description [Member] | NEW YORK | Bronx Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 390
Cost Capitalized Subsequent to Initial Investment	54
Land	251
Building and Improvements	193
Total Investment in Real Estate	444
Accumulated Depreciation and Amortization	$ 171
Date of Initial Leasehold or Acquisition Investment	1,985
Accumulated Depreciation And Amortization Description [Member] | NEW YORK | Bronx Three [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 877
Land	877
Total Investment in Real Estate	$ 877
Date of Initial Leasehold or Acquisition Investment	2,013
Accumulated Depreciation And Amortization Description [Member] | NEW YORK | Bronx Four [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 884
Land	884
Total Investment in Real Estate	$ 884
Date of Initial Leasehold or Acquisition Investment	2,013
Accumulated Depreciation And Amortization Description [Member] | NEW YORK | Bronx Five [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 953
Land	953
Total Investment in Real Estate	$ 953
Date of Initial Leasehold or Acquisition Investment	2,013
Accumulated Depreciation And Amortization Description [Member] | NEW YORK | Bronx Six [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,049
Land	485
Building and Improvements	564
Total Investment in Real Estate	1,049
Accumulated Depreciation and Amortization	$ 184
Date of Initial Leasehold or Acquisition Investment	2,013
Accumulated Depreciation And Amortization Description [Member] | NEW YORK | Bronx Seven [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,910
Land	1,349
Building and Improvements	561
Total Investment in Real Estate	1,910
Accumulated Depreciation and Amortization	$ 191
Date of Initial Leasehold or Acquisition Investment	2,013
Accumulated Depreciation And Amortization Description [Member] | NEW YORK | Bronx Eight [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 2,408
Land	1,712
Building and Improvements	696
Total Investment in Real Estate	2,408
Accumulated Depreciation and Amortization	$ 214
Date of Initial Leasehold or Acquisition Investment	2,013
Accumulated Depreciation And Amortization Description [Member] | NEW YORK | Bronxville [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,232
Land	1,232
Total Investment in Real Estate	$ 1,232
Date of Initial Leasehold or Acquisition Investment	2,011
Accumulated Depreciation And Amortization Description [Member] | NEW YORK | Brooklyn One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 100
Cost Capitalized Subsequent to Initial Investment	345
Land	67
Building and Improvements	378
Total Investment in Real Estate	445
Accumulated Depreciation and Amortization	$ 227
Date of Initial Leasehold or Acquisition Investment	1,972
Accumulated Depreciation And Amortization Description [Member] | NEW YORK | Brooklyn Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 75
Cost Capitalized Subsequent to Initial Investment	382
Land	31
Building and Improvements	426
Total Investment in Real Estate	457
Accumulated Depreciation and Amortization	$ 264
Date of Initial Leasehold or Acquisition Investment	1,967
Accumulated Depreciation And Amortization Description [Member] | NEW YORK | Brooklyn Three [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 282
Cost Capitalized Subsequent to Initial Investment	271
Land	176
Building and Improvements	377
Total Investment in Real Estate	553
Accumulated Depreciation and Amortization	$ 361
Date of Initial Leasehold or Acquisition Investment	1,967
Accumulated Depreciation And Amortization Description [Member] | NEW YORK | Brooklyn Four [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 148
Cost Capitalized Subsequent to Initial Investment	437
Land	104
Building and Improvements	481
Total Investment in Real Estate	585
Accumulated Depreciation and Amortization	$ 294
Date of Initial Leasehold or Acquisition Investment	1,972
Accumulated Depreciation And Amortization Description [Member] | NEW YORK | Brooklyn Five [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 237
Cost Capitalized Subsequent to Initial Investment	372
Land	154
Building and Improvements	455
Total Investment in Real Estate	609
Accumulated Depreciation and Amortization	$ 233
Date of Initial Leasehold or Acquisition Investment	1,985
Accumulated Depreciation And Amortization Description [Member] | NEW YORK | Brooklyn Six
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 476
Cost Capitalized Subsequent to Initial Investment	320
Land	306
Building and Improvements	490
Total Investment in Real Estate	796
Accumulated Depreciation and Amortization	$ 316
Date of Initial Leasehold or Acquisition Investment	1,985
Accumulated Depreciation And Amortization Description [Member] | NEW YORK | Brooklyn Seven [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 422
Cost Capitalized Subsequent to Initial Investment	383
Land	275
Building and Improvements	530
Total Investment in Real Estate	805
Accumulated Depreciation and Amortization	$ 322
Date of Initial Leasehold or Acquisition Investment	1,985
Accumulated Depreciation And Amortization Description [Member] | NEW YORK | Brooklyn Eight [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 627
Cost Capitalized Subsequent to Initial Investment	313
Land	408
Building and Improvements	532
Total Investment in Real Estate	940
Accumulated Depreciation and Amortization	$ 342
Date of Initial Leasehold or Acquisition Investment	1,985
Accumulated Depreciation And Amortization Description [Member] | NEW YORK | Buffalo [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 313
Cost Capitalized Subsequent to Initial Investment	241
Land	151
Building and Improvements	403
Total Investment in Real Estate	554
Accumulated Depreciation and Amortization	$ 228
Date of Initial Leasehold or Acquisition Investment	2,000
Accumulated Depreciation And Amortization Description [Member] | NEW YORK | Byron [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 969
Land	669
Building and Improvements	300
Total Investment in Real Estate	969
Accumulated Depreciation and Amortization	$ 154
Date of Initial Leasehold or Acquisition Investment	2,006
Accumulated Depreciation And Amortization Description [Member] | NEW YORK | Chester [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,158
Land	1,158
Total Investment in Real Estate	$ 1,158
Date of Initial Leasehold or Acquisition Investment	2,011
Accumulated Depreciation And Amortization Description [Member] | NEW YORK | Churchville [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,012
Land	602
Building and Improvements	410
Total Investment in Real Estate	1,012
Accumulated Depreciation and Amortization	$ 210
Date of Initial Leasehold or Acquisition Investment	2,006
Accumulated Depreciation And Amortization Description [Member] | NEW YORK | Corona One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 115
Cost Capitalized Subsequent to Initial Investment	300
Land	113
Building and Improvements	302
Total Investment in Real Estate	415
Accumulated Depreciation and Amortization	$ 302
Date of Initial Leasehold or Acquisition Investment	1,965
Accumulated Depreciation And Amortization Description [Member] | NEW YORK | Corona Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 2,543
Land	1,903
Building and Improvements	640
Total Investment in Real Estate	2,543
Accumulated Depreciation and Amortization	$ 200
Date of Initial Leasehold or Acquisition Investment	2,013
Accumulated Depreciation And Amortization Description [Member] | NEW YORK | Cortland Manor [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,872
Land	1,872
Total Investment in Real Estate	$ 1,872
Date of Initial Leasehold or Acquisition Investment	2,011
Accumulated Depreciation And Amortization Description [Member] | NEW YORK | Dobbs Ferry One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 670
Cost Capitalized Subsequent to Initial Investment	34
Land	434
Building and Improvements	270
Total Investment in Real Estate	704
Accumulated Depreciation and Amortization	$ 232
Date of Initial Leasehold or Acquisition Investment	1,985
Accumulated Depreciation And Amortization Description [Member] | NEW YORK | Dobbs Ferry Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,345
Land	1,345
Total Investment in Real Estate	$ 1,345
Date of Initial Leasehold or Acquisition Investment	2,011
Accumulated Depreciation And Amortization Description [Member] | NEW YORK | East Hampton One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 660
Cost Capitalized Subsequent to Initial Investment	39
Land	428
Building and Improvements	271
Total Investment in Real Estate	699
Accumulated Depreciation and Amortization	$ 233
Date of Initial Leasehold or Acquisition Investment	1,985
Accumulated Depreciation And Amortization Description [Member] | NEW YORK | Eastchester One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,724
Cost Capitalized Subsequent to Initial Investment	993
Land	2,302
Building and Improvements	415
Total Investment in Real Estate	2,717
Accumulated Depreciation and Amortization	$ 45
Date of Initial Leasehold or Acquisition Investment	2,011
Accumulated Depreciation And Amortization Description [Member] | NEW YORK | Elmont One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 389
Cost Capitalized Subsequent to Initial Investment	319
Land	231
Building and Improvements	477
Total Investment in Real Estate	708
Accumulated Depreciation and Amortization	$ 333
Date of Initial Leasehold or Acquisition Investment	1,978
Accumulated Depreciation And Amortization Description [Member] | NEW YORK | Elmsford One [Member]
Schedule Of Investments In Real Estate [Line Items]
Cost Capitalized Subsequent to Initial Investment	$ 948
Land	581
Building and Improvements	367
Total Investment in Real Estate	948
Accumulated Depreciation and Amortization	$ 244
Date of Initial Leasehold or Acquisition Investment	1,971
Accumulated Depreciation And Amortization Description [Member] | NEW YORK | Elmsford Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,453
Land	1,453
Total Investment in Real Estate	$ 1,453
Date of Initial Leasehold or Acquisition Investment	2,011
Accumulated Depreciation And Amortization Description [Member] | NEW YORK | Fishkill One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,793
Land	1,793
Total Investment in Real Estate	$ 1,793
Date of Initial Leasehold or Acquisition Investment	2,011
Accumulated Depreciation And Amortization Description [Member] | NEW YORK | Floral Park One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 616
Cost Capitalized Subsequent to Initial Investment	170
Land	356
Building and Improvements	430
Total Investment in Real Estate	786
Accumulated Depreciation and Amortization	$ 275
Date of Initial Leasehold or Acquisition Investment	1,998
Accumulated Depreciation And Amortization Description [Member] | NEW YORK | Flushing One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 516
Cost Capitalized Subsequent to Initial Investment	241
Land	320
Building and Improvements	437
Total Investment in Real Estate	757
Accumulated Depreciation and Amortization	$ 258
Date of Initial Leasehold or Acquisition Investment	1,998
Accumulated Depreciation And Amortization Description [Member] | NEW YORK | Flushing Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,936
Land	1,413
Building and Improvements	523
Total Investment in Real Estate	1,936
Accumulated Depreciation and Amortization	$ 170
Date of Initial Leasehold or Acquisition Investment	2,013
Accumulated Depreciation And Amortization Description [Member] | NEW YORK | Flushing Three [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,947
Land	1,405
Building and Improvements	542
Total Investment in Real Estate	1,947
Accumulated Depreciation and Amortization	$ 162
Date of Initial Leasehold or Acquisition Investment	2,013
Accumulated Depreciation And Amortization Description [Member] | NEW YORK | Flushing Four [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 2,478
Land	1,801
Building and Improvements	677
Total Investment in Real Estate	2,478
Accumulated Depreciation and Amortization	$ 203
Date of Initial Leasehold or Acquisition Investment	2,013
Accumulated Depreciation And Amortization Description [Member] | NEW YORK | Forrest Hill One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,273
Land	1,273
Total Investment in Real Estate	$ 1,273
Date of Initial Leasehold or Acquisition Investment	2,013
Accumulated Depreciation And Amortization Description [Member] | NEW YORK | Franklin Square One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 153
Cost Capitalized Subsequent to Initial Investment	331
Land	137
Building and Improvements	347
Total Investment in Real Estate	484
Accumulated Depreciation and Amortization	$ 195
Date of Initial Leasehold or Acquisition Investment	1,978
Accumulated Depreciation And Amortization Description [Member] | NEW YORK | East Pembroke One
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 787
Land	537
Building and Improvements	250
Total Investment in Real Estate	787
Accumulated Depreciation and Amortization	$ 128
Date of Initial Leasehold or Acquisition Investment	2,006

Schedule III - Real Estate a_17

Schedule III - Real Estate and Accumulated Depreciation and Amortization Part 16 (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Schedule Of Investments In Real Estate [Line Items]
Total Investment in Real Estate	$ 1,043,106	$ 970,964	$ 782,166	$ 783,233
Accumulated Depreciation And Amortization Description [Member] | ARKANSAS [Member] | Bluff [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	2,985
Land	2,166
Building and Improvements	819
Total Investment in Real Estate	2,985
Accumulated Depreciation and Amortization	$ 30
Date of Initial Leasehold or Acquisition Investment	2,018
Accumulated Depreciation And Amortization Description [Member] | ARKANSAS [Member] | Brookland One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,468
Land	149
Building and Improvements	1,319
Total Investment in Real Estate	1,468
Accumulated Depreciation and Amortization	$ 615
Date of Initial Leasehold or Acquisition Investment	2,007
Accumulated Depreciation And Amortization Description [Member] | ARKANSAS [Member] | Jonesboro One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 868
Land	173
Building and Improvements	695
Total Investment in Real Estate	868
Accumulated Depreciation and Amortization	$ 338
Date of Initial Leasehold or Acquisition Investment	2,007
Accumulated Depreciation And Amortization Description [Member] | ARKANSAS [Member] | Fayetteville One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 2,266
Land	1,637
Building and Improvements	629
Total Investment in Real Estate	2,266
Accumulated Depreciation and Amortization	$ 23
Date of Initial Leasehold or Acquisition Investment	2,018
Accumulated Depreciation And Amortization Description [Member] | ARKANSAS [Member] | Jonesboro Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 2,985
Land	330
Building and Improvements	2,655
Total Investment in Real Estate	2,985
Accumulated Depreciation and Amortization	$ 1,285
Date of Initial Leasehold or Acquisition Investment	2,007
Accumulated Depreciation And Amortization Description [Member] | ARKANSAS [Member] | Fayetteville Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 2,867
Land	1,971
Building and Improvements	896
Total Investment in Real Estate	2,867
Accumulated Depreciation and Amortization	$ 33
Date of Initial Leasehold or Acquisition Investment	2,018
Accumulated Depreciation And Amortization Description [Member] | ARKANSAS [Member] | Hope [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,472
Land	999
Building and Improvements	473
Total Investment in Real Estate	1,472
Accumulated Depreciation and Amortization	$ 18
Date of Initial Leasehold or Acquisition Investment	2,018
Accumulated Depreciation And Amortization Description [Member] | ARKANSAS [Member] | Little Rock [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 978
Land	535
Building and Improvements	443
Total Investment in Real Estate	978
Accumulated Depreciation and Amortization	$ 19
Date of Initial Leasehold or Acquisition Investment	2,018
Accumulated Depreciation And Amortization Description [Member] | ARKANSAS [Member] | Rogers [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 927
Land	533
Building and Improvements	394
Total Investment in Real Estate	927
Accumulated Depreciation and Amortization	$ 17
Date of Initial Leasehold or Acquisition Investment	2,018
Accumulated Depreciation And Amortization Description [Member] | ARKANSAS [Member] | Texarkana [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,592
Land	1,058
Building and Improvements	534
Total Investment in Real Estate	1,592
Accumulated Depreciation and Amortization	$ 21
Date of Initial Leasehold or Acquisition Investment	2,018
Accumulated Depreciation And Amortization Description [Member] | CALIFORNIA [Member] | Bellflower One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,369
Land	910
Building and Improvements	459
Total Investment in Real Estate	1,369
Accumulated Depreciation and Amortization	$ 271
Date of Initial Leasehold or Acquisition Investment	2,007
Accumulated Depreciation And Amortization Description [Member] | CALIFORNIA [Member] | Benicia One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 2,224
Land	1,058
Building and Improvements	1,166
Total Investment in Real Estate	2,224
Accumulated Depreciation and Amortization	$ 714
Date of Initial Leasehold or Acquisition Investment	2,007
Accumulated Depreciation And Amortization Description [Member] | CALIFORNIA [Member] | Chula Vista One[Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 2,385
Land	889
Building and Improvements	1,496
Total Investment in Real Estate	2,385
Accumulated Depreciation and Amortization	$ 299
Date of Initial Leasehold or Acquisition Investment	2,014
Accumulated Depreciation And Amortization Description [Member] | CALIFORNIA [Member] | Coachella One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 2,235
Land	1,217
Building and Improvements	1,018
Total Investment in Real Estate	2,235
Accumulated Depreciation and Amortization	$ 589
Date of Initial Leasehold or Acquisition Investment	2,007
Accumulated Depreciation And Amortization Description [Member] | CALIFORNIA [Member] | Cotati One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 6,072
Land	4,008
Building and Improvements	2,064
Total Investment in Real Estate	6,072
Accumulated Depreciation and Amortization	$ 407
Date of Initial Leasehold or Acquisition Investment	2,015
Accumulated Depreciation And Amortization Description [Member] | CALIFORNIA [Member] | Fillmore One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,354
Land	950
Building and Improvements	404
Total Investment in Real Estate	1,354
Accumulated Depreciation and Amortization	$ 238
Date of Initial Leasehold or Acquisition Investment	2,007
Accumulated Depreciation And Amortization Description [Member] | CALIFORNIA [Member] | Grass Valley One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,485
Land	853
Building and Improvements	632
Total Investment in Real Estate	1,485
Accumulated Depreciation and Amortization	$ 128
Date of Initial Leasehold or Acquisition Investment	2,015
Accumulated Depreciation And Amortization Description [Member] | CALIFORNIA [Member] | Hesperia One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,643
Land	849
Building and Improvements	794
Total Investment in Real Estate	1,643
Accumulated Depreciation and Amortization	$ 440
Date of Initial Leasehold or Acquisition Investment	2,007
Accumulated Depreciation And Amortization Description [Member] | CALIFORNIA [Member] | Hesperia Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 2,055
Land	492
Building and Improvements	1,563
Total Investment in Real Estate	2,055
Accumulated Depreciation and Amortization	$ 375
Date of Initial Leasehold or Acquisition Investment	2,015
Accumulated Depreciation And Amortization Description [Member] | CALIFORNIA [Member] | Indio One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,250
Land	302
Building and Improvements	948
Total Investment in Real Estate	1,250
Accumulated Depreciation and Amortization	$ 201
Date of Initial Leasehold or Acquisition Investment	2,015
Accumulated Depreciation And Amortization Description [Member] | CALIFORNIA [Member] | Indio Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 2,727
Land	1,486
Building and Improvements	1,241
Total Investment in Real Estate	2,727
Accumulated Depreciation and Amortization	$ 276
Date of Initial Leasehold or Acquisition Investment	2,015
Accumulated Depreciation And Amortization Description [Member] | CALIFORNIA [Member] | La Palma One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,971
Land	1,389
Building and Improvements	582
Total Investment in Real Estate	1,971
Accumulated Depreciation and Amortization	$ 339
Date of Initial Leasehold or Acquisition Investment	2,007
Accumulated Depreciation And Amortization Description [Member] | CALIFORNIA [Member] | La Puenta [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 7,615
Land	6,405
Building and Improvements	1,210
Total Investment in Real Estate	7,615
Accumulated Depreciation and Amortization	$ 282
Date of Initial Leasehold or Acquisition Investment	2,015
Accumulated Depreciation And Amortization Description [Member] | ARIZONA [Member] | Cochise One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,765
Land	269
Building and Improvements	1,496
Total Investment in Real Estate	1,765
Accumulated Depreciation and Amortization	$ 133
Date of Initial Leasehold or Acquisition Investment	2,017
Accumulated Depreciation And Amortization Description [Member] | ARIZONA [Member] | Cochise Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 4,440
Land	1,849
Building and Improvements	2,591
Total Investment in Real Estate	4,440
Accumulated Depreciation and Amortization	$ 182
Date of Initial Leasehold or Acquisition Investment	2,017
Accumulated Depreciation And Amortization Description [Member] | ARIZONA [Member] | Maricopa One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,331
Land	992
Building and Improvements	339
Total Investment in Real Estate	1,331
Accumulated Depreciation and Amortization	$ 30
Date of Initial Leasehold or Acquisition Investment	2,017
Accumulated Depreciation And Amortization Description [Member] | ARIZONA [Member] | Maricopa Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,448
Land	983
Building and Improvements	465
Total Investment in Real Estate	1,448
Accumulated Depreciation and Amortization	$ 40
Date of Initial Leasehold or Acquisition Investment	2,017
Accumulated Depreciation And Amortization Description [Member] | ARIZONA [Member] | Maricopa Three [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,503
Land	839
Building and Improvements	664
Total Investment in Real Estate	1,503
Accumulated Depreciation and Amortization	$ 55
Date of Initial Leasehold or Acquisition Investment	2,017
Accumulated Depreciation And Amortization Description [Member] | ARIZONA [Member] | Phoenix One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,943
Land	1,311
Building and Improvements	632
Total Investment in Real Estate	1,943
Accumulated Depreciation and Amortization	$ 18
Date of Initial Leasehold or Acquisition Investment	2,018
Accumulated Depreciation And Amortization Description [Member] | ARIZONA [Member] | Maricopa Four [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,602
Land	796
Building and Improvements	806
Total Investment in Real Estate	1,602
Accumulated Depreciation and Amortization	$ 68
Date of Initial Leasehold or Acquisition Investment	2,017
Accumulated Depreciation And Amortization Description [Member] | ARIZONA [Member] | Maricopa Five [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,722
Land	1,178
Building and Improvements	544
Total Investment in Real Estate	1,722
Accumulated Depreciation and Amortization	$ 45
Date of Initial Leasehold or Acquisition Investment	2,017
Accumulated Depreciation And Amortization Description [Member] | ARIZONA [Member] | Maricopa Six [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,838
Land	1,261
Building and Improvements	577
Total Investment in Real Estate	1,838
Accumulated Depreciation and Amortization	$ 50
Date of Initial Leasehold or Acquisition Investment	2,017
Accumulated Depreciation And Amortization Description [Member] | ARIZONA [Member] | Maricopa Seven [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 2,177
Land	1,532
Building and Improvements	645
Total Investment in Real Estate	2,177
Accumulated Depreciation and Amortization	$ 53
Date of Initial Leasehold or Acquisition Investment	2,017
Accumulated Depreciation And Amortization Description [Member] | ARIZONA [Member] | Maricopa Eight [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 2,185
Land	1,612
Building and Improvements	573
Total Investment in Real Estate	2,185
Accumulated Depreciation and Amortization	$ 48
Date of Initial Leasehold or Acquisition Investment	2,017
Accumulated Depreciation And Amortization Description [Member] | ARIZONA [Member] | Maricopa Nine [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 2,415
Land	433
Building and Improvements	1,982
Total Investment in Real Estate	2,415
Accumulated Depreciation and Amortization	$ 140
Date of Initial Leasehold or Acquisition Investment	2,017
Accumulated Depreciation And Amortization Description [Member] | ARIZONA [Member] | Maricopa Ten [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 2,868
Land	1,255
Building and Improvements	1,613
Total Investment in Real Estate	2,868
Accumulated Depreciation and Amortization	$ 128
Date of Initial Leasehold or Acquisition Investment	2,017
Accumulated Depreciation And Amortization Description [Member] | ARIZONA [Member] | Maricopa Eleven [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 3,112
Land	1,593
Building and Improvements	1,519
Total Investment in Real Estate	3,112
Accumulated Depreciation and Amortization	$ 118
Date of Initial Leasehold or Acquisition Investment	2,017
Accumulated Depreciation And Amortization Description [Member] | ARIZONA [Member] | Maricopa Twelve [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 3,169
Land	2,005
Building and Improvements	1,164
Total Investment in Real Estate	3,169
Accumulated Depreciation and Amortization	$ 87
Date of Initial Leasehold or Acquisition Investment	2,017
Accumulated Depreciation And Amortization Description [Member] | ARIZONA [Member] | Maricopa Thirteen [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 3,204
Land	1,839
Building and Improvements	1,365
Total Investment in Real Estate	3,204
Accumulated Depreciation and Amortization	$ 106
Date of Initial Leasehold or Acquisition Investment	2,017
Accumulated Depreciation And Amortization Description [Member] | ARIZONA [Member] | Maricopa Fourteen [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 3,928
Land	2,334
Building and Improvements	1,594
Total Investment in Real Estate	3,928
Accumulated Depreciation and Amortization	$ 116
Date of Initial Leasehold or Acquisition Investment	2,017
Accumulated Depreciation And Amortization Description [Member] | ARIZONA [Member] | Pima One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,261
Land	664
Building and Improvements	597
Total Investment in Real Estate	1,261
Accumulated Depreciation and Amortization	$ 49
Date of Initial Leasehold or Acquisition Investment	2,017
Accumulated Depreciation And Amortization Description [Member] | ARIZONA [Member] | Pima Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,301
Land	557
Building and Improvements	744
Total Investment in Real Estate	1,301
Accumulated Depreciation and Amortization	$ 60
Date of Initial Leasehold or Acquisition Investment	2,017
Accumulated Depreciation And Amortization Description [Member] | ARIZONA [Member] | Pima Three [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,303
Land	590
Building and Improvements	713
Total Investment in Real Estate	1,303
Accumulated Depreciation and Amortization	$ 58
Date of Initial Leasehold or Acquisition Investment	2,017
Accumulated Depreciation And Amortization Description [Member] | ARIZONA [Member] | Pima Four [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 2,085
Land	1,487
Building and Improvements	598
Total Investment in Real Estate	2,085
Accumulated Depreciation and Amortization	$ 52
Date of Initial Leasehold or Acquisition Investment	2,017
Accumulated Depreciation And Amortization Description [Member] | ARIZONA [Member] | Pima Five [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 3,652
Land	2,924
Building and Improvements	728
Total Investment in Real Estate	3,652
Accumulated Depreciation and Amortization	$ 59
Date of Initial Leasehold or Acquisition Investment	2,017
Accumulated Depreciation And Amortization Description [Member] | ARIZONA [Member] | Pinal [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 4,022
Land	2,549
Building and Improvements	1,473
Total Investment in Real Estate	4,022
Accumulated Depreciation and Amortization	$ 119
Date of Initial Leasehold or Acquisition Investment	2,017
Accumulated Depreciation And Amortization Description [Member] | NEW YORK | Garden City One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 362
Cost Capitalized Subsequent to Initial Investment	242
Land	236
Building and Improvements	368
Total Investment in Real Estate	604
Accumulated Depreciation and Amortization	$ 210
Date of Initial Leasehold or Acquisition Investment	1,985
Accumulated Depreciation And Amortization Description [Member] | NEW YORK | Garnerville One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,508
Land	1,508
Total Investment in Real Estate	$ 1,508
Date of Initial Leasehold or Acquisition Investment	2,011
Accumulated Depreciation And Amortization Description [Member] | NEW YORK | Glen Head One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 235
Cost Capitalized Subsequent to Initial Investment	216
Land	103
Building and Improvements	348
Total Investment in Real Estate	451
Accumulated Depreciation and Amortization	$ 348
Date of Initial Leasehold or Acquisition Investment	1,982
Accumulated Depreciation And Amortization Description [Member] | NEW YORK | Glen HeadTwo [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 463
Cost Capitalized Subsequent to Initial Investment	282
Land	301
Building and Improvements	444
Total Investment in Real Estate	745
Accumulated Depreciation and Amortization	$ 275
Date of Initial Leasehold or Acquisition Investment	1,985
Accumulated Depreciation And Amortization Description [Member] | NEW YORK | Great Neck One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 500
Cost Capitalized Subsequent to Initial Investment	252
Land	450
Building and Improvements	302
Total Investment in Real Estate	752
Accumulated Depreciation and Amortization	$ 166
Date of Initial Leasehold or Acquisition Investment	1,985
Accumulated Depreciation And Amortization Description [Member] | NEW YORK | Hartsdale One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,626
Land	1,626
Total Investment in Real Estate	$ 1,626
Date of Initial Leasehold or Acquisition Investment	2,011
Accumulated Depreciation And Amortization Description [Member] | NEW YORK | Hawthorne One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 2,084
Land	2,084
Total Investment in Real Estate	$ 2,084
Date of Initial Leasehold or Acquisition Investment	2,011
Accumulated Depreciation And Amortization Description [Member] | NEW YORK | Hopewell Junction One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,163
Land	1,163
Total Investment in Real Estate	$ 1,163
Date of Initial Leasehold or Acquisition Investment	2,011
Accumulated Depreciation And Amortization Description [Member] | NEW YORK | Huntington Station One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 141
Cost Capitalized Subsequent to Initial Investment	284
Land	84
Building and Improvements	341
Total Investment in Real Estate	425
Accumulated Depreciation and Amortization	$ 202
Date of Initial Leasehold or Acquisition Investment	1,978
Accumulated Depreciation And Amortization Description [Member] | NEW YORK | Hyde Park One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 990
Land	990
Total Investment in Real Estate	$ 990
Date of Initial Leasehold or Acquisition Investment	2,011
Accumulated Depreciation And Amortization Description [Member] | NEW YORK | Katonah One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,084
Land	1,084
Total Investment in Real Estate	$ 1,084
Date of Initial Leasehold or Acquisition Investment	2,011
Accumulated Depreciation And Amortization Description [Member] | NEW YORK | Lakeville One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,028
Land	203
Building and Improvements	825
Total Investment in Real Estate	1,028
Accumulated Depreciation and Amortization	$ 537
Date of Initial Leasehold or Acquisition Investment	2,008
Accumulated Depreciation And Amortization Description [Member] | NEW YORK | Levittown One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 503
Cost Capitalized Subsequent to Initial Investment	42
Land	327
Building and Improvements	218
Total Investment in Real Estate	545
Accumulated Depreciation and Amortization	$ 189
Date of Initial Leasehold or Acquisition Investment	1,985
Accumulated Depreciation And Amortization Description [Member] | NEW YORK | Levittown Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 547
Cost Capitalized Subsequent to Initial Investment	86
Land	356
Building and Improvements	277
Total Investment in Real Estate	633
Accumulated Depreciation and Amortization	$ 231
Date of Initial Leasehold or Acquisition Investment	1,985
Accumulated Depreciation And Amortization Description [Member] | NEW YORK | Long Island City One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 2,717
Land	1,183
Building and Improvements	1,534
Total Investment in Real Estate	2,717
Accumulated Depreciation and Amortization	$ 416
Date of Initial Leasehold or Acquisition Investment	2,013
Accumulated Depreciation And Amortization Description [Member] | NEW YORK | Mamaroneck One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,429
Land	1,429
Total Investment in Real Estate	$ 1,429
Date of Initial Leasehold or Acquisition Investment	2,011
Accumulated Depreciation And Amortization Description [Member] | NEW YORK | Massapequa One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 333
Cost Capitalized Subsequent to Initial Investment	285
Land	217
Building and Improvements	401
Total Investment in Real Estate	618
Accumulated Depreciation and Amortization	$ 228
Date of Initial Leasehold or Acquisition Investment	1,985
Accumulated Depreciation And Amortization Description [Member] | NEW YORK | Mastic One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 313
Cost Capitalized Subsequent to Initial Investment	110
Land	204
Building and Improvements	219
Total Investment in Real Estate	423
Accumulated Depreciation and Amortization	$ 202
Date of Initial Leasehold or Acquisition Investment	1,985
Accumulated Depreciation And Amortization Description [Member] | NEW YORK | Middletown One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 719
Land	719
Total Investment in Real Estate	$ 719
Date of Initial Leasehold or Acquisition Investment	2,011
Accumulated Depreciation And Amortization Description [Member] | NEW YORK | Middletown Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 751
Cost Capitalized Subsequent to Initial Investment	274
Land	489
Building and Improvements	536
Total Investment in Real Estate	1,025
Accumulated Depreciation and Amortization	$ 348
Date of Initial Leasehold or Acquisition Investment	1,985
Accumulated Depreciation And Amortization Description [Member] | NEW YORK | Middletown Three [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,281
Land	1,281
Total Investment in Real Estate	$ 1,281
Date of Initial Leasehold or Acquisition Investment	2,011
Accumulated Depreciation And Amortization Description [Member] | NEW YORK | Millwood Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,448
Land	1,448
Total Investment in Real Estate	$ 1,448
Date of Initial Leasehold or Acquisition Investment	2,011
Accumulated Depreciation And Amortization Description [Member] | NEW YORK | Mount Kisco One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,907
Land	1,907
Total Investment in Real Estate	$ 1,907
Date of Initial Leasehold or Acquisition Investment	2,011
Accumulated Depreciation And Amortization Description [Member] | NEW YORK | Mount Kisco One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 985
Land	985
Total Investment in Real Estate	$ 985
Date of Initial Leasehold or Acquisition Investment	2,011
Accumulated Depreciation And Amortization Description [Member] | NEW YORK | Nanuet One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 2,316
Land	2,316
Total Investment in Real Estate	$ 2,316
Date of Initial Leasehold or Acquisition Investment	2,011
Accumulated Depreciation And Amortization Description [Member] | NEW YORK | Naples One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,257
Land	827
Building and Improvements	430
Total Investment in Real Estate	1,257
Accumulated Depreciation and Amortization	$ 221
Date of Initial Leasehold or Acquisition Investment	2,006
Accumulated Depreciation And Amortization Description [Member] | NEW YORK | New Paltz One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 971
Land	971
Total Investment in Real Estate	$ 971
Date of Initial Leasehold or Acquisition Investment	2,011
Accumulated Depreciation And Amortization Description [Member] | NEW YORK | New Rochelle One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 189
Cost Capitalized Subsequent to Initial Investment	358
Land	104
Building and Improvements	443
Total Investment in Real Estate	547
Accumulated Depreciation and Amortization	$ 240
Date of Initial Leasehold or Acquisition Investment	1,982
Accumulated Depreciation And Amortization Description [Member] | NEW YORK | New Rochelle Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,887
Land	1,887
Total Investment in Real Estate	$ 1,887
Date of Initial Leasehold or Acquisition Investment	2,011
Accumulated Depreciation And Amortization Description [Member] | NEW YORK | New Windsor One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,084
Land	1,084
Total Investment in Real Estate	$ 1,084
Date of Initial Leasehold or Acquisition Investment	2,011
Accumulated Depreciation And Amortization Description [Member] | NEW YORK | New York One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 126
Cost Capitalized Subsequent to Initial Investment	399
Land	78
Building and Improvements	447
Total Investment in Real Estate	525
Accumulated Depreciation and Amortization	$ 309
Date of Initial Leasehold or Acquisition Investment	1,972
Accumulated Depreciation And Amortization Description [Member] | NEW YORK | Newburgh One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 527
Land	527
Total Investment in Real Estate	$ 527
Date of Initial Leasehold or Acquisition Investment	2,011
Accumulated Depreciation And Amortization Description [Member] | NEW YORK | Newburgh Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,192
Land	1,192
Total Investment in Real Estate	$ 1,192
Date of Initial Leasehold or Acquisition Investment	2,011
Accumulated Depreciation And Amortization Description [Member] | NEW YORK | Niskayuna [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 425
Cost Capitalized Subsequent to Initial Investment	35
Land	275
Building and Improvements	185
Total Investment in Real Estate	460
Accumulated Depreciation and Amortization	$ 185
Date of Initial Leasehold or Acquisition Investment	1,986
Accumulated Depreciation And Amortization Description [Member] | NEW YORK | North Andover [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 393
Cost Capitalized Subsequent to Initial Investment	33
Land	256
Building and Improvements	170
Total Investment in Real Estate	426
Accumulated Depreciation and Amortization	$ 148
Date of Initial Leasehold or Acquisition Investment	1,985
Accumulated Depreciation And Amortization Description [Member] | NEW YORK | Ossining One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 231
Cost Capitalized Subsequent to Initial Investment	198
Land	117
Building and Improvements	312
Total Investment in Real Estate	429
Accumulated Depreciation and Amortization	$ 171
Date of Initial Leasehold or Acquisition Investment	1,985
Accumulated Depreciation And Amortization Description [Member] | NEW YORK | Ozone Park One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 58
Cost Capitalized Subsequent to Initial Investment	365
Land	45
Building and Improvements	378
Total Investment in Real Estate	423
Accumulated Depreciation and Amortization	$ 228
Date of Initial Leasehold or Acquisition Investment	1,976
Accumulated Depreciation And Amortization Description [Member] | NEW YORK | Peekskill One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 2,207
Land	2,207
Total Investment in Real Estate	$ 2,207
Date of Initial Leasehold or Acquisition Investment	2,011
Accumulated Depreciation And Amortization Description [Member] | NEW YORK | Pelham Manor One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 137
Cost Capitalized Subsequent to Initial Investment	307
Land	75
Building and Improvements	369
Total Investment in Real Estate	444
Accumulated Depreciation and Amortization	$ 230
Date of Initial Leasehold or Acquisition Investment	1,985
Accumulated Depreciation And Amortization Description [Member] | NEW YORK | Prattsburgh [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 553
Land	303
Building and Improvements	250
Total Investment in Real Estate	553
Accumulated Depreciation and Amortization	$ 128
Date of Initial Leasehold or Acquisition Investment	2,006
Accumulated Depreciation And Amortization Description [Member] | NEW YORK | Pelham One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,035
Land	1,035
Total Investment in Real Estate	$ 1,035
Date of Initial Leasehold or Acquisition Investment	2,011
Accumulated Depreciation And Amortization Description [Member] | NEW YORK | Perry One
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,444
Land	1,044
Building and Improvements	400
Total Investment in Real Estate	1,444
Accumulated Depreciation and Amortization	$ 205
Date of Initial Leasehold or Acquisition Investment	2,006
Accumulated Depreciation And Amortization Description [Member] | NEW YORK | Pleasant Valley One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 398
Cost Capitalized Subsequent to Initial Investment	62
Land	240
Building and Improvements	220
Total Investment in Real Estate	460
Accumulated Depreciation and Amortization	$ 209
Date of Initial Leasehold or Acquisition Investment	1,986
Accumulated Depreciation And Amortization Description [Member] | NEW YORK | Port Chester One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 941
Building and Improvements	941
Total Investment in Real Estate	941
Accumulated Depreciation and Amortization	$ 443
Date of Initial Leasehold or Acquisition Investment	2,011
Accumulated Depreciation And Amortization Description [Member] | NEW YORK | Port Chester Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,015
Land	1,015
Total Investment in Real Estate	$ 1,015
Date of Initial Leasehold or Acquisition Investment	2,011
Accumulated Depreciation And Amortization Description [Member] | NEW YORK | Port Jefferson One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 185
Cost Capitalized Subsequent to Initial Investment	3,080
Land	246
Building and Improvements	3,019
Total Investment in Real Estate	3,265
Accumulated Depreciation and Amortization	$ 14
Date of Initial Leasehold or Acquisition Investment	1,985
Accumulated Depreciation And Amortization Description [Member] | NEW YORK | Poughkeepsie One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 591
Land	591
Total Investment in Real Estate	$ 591
Date of Initial Leasehold or Acquisition Investment	2,011
Accumulated Depreciation And Amortization Description [Member] | NEW YORK | Poughkeepsie Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,020
Land	1,020
Total Investment in Real Estate	$ 1,020
Date of Initial Leasehold or Acquisition Investment	2,011
Accumulated Depreciation And Amortization Description [Member] | NEW YORK | Poughkeepsie Three [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,232
Cost Capitalized Subsequent to Initial Investment	(32)
Land	1,200
Total Investment in Real Estate	$ 1,200
Date of Initial Leasehold or Acquisition Investment	2,011
Accumulated Depreciation And Amortization Description [Member] | NEW YORK | Poughkeepsie Four [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,340
Cost Capitalized Subsequent to Initial Investment	(60)
Land	1,280
Total Investment in Real Estate	$ 1,280
Date of Initial Leasehold or Acquisition Investment	2,011
Accumulated Depreciation And Amortization Description [Member] | NEW YORK | Poughkeepsie Five [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,306
Land	1,306
Total Investment in Real Estate	$ 1,306
Date of Initial Leasehold or Acquisition Investment	2,011
Accumulated Depreciation And Amortization Description [Member] | NEW YORK | Poughkeepsie Six [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,355
Land	1,355
Total Investment in Real Estate	$ 1,355
Date of Initial Leasehold or Acquisition Investment	2,011

Schedule III - Real Estate a_18

Schedule III - Real Estate and Accumulated Depreciation and Amortization Part 17 (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Schedule Of Investments In Real Estate [Line Items]
Total Investment in Real Estate	$ 1,043,106	$ 970,964	$ 782,166	$ 783,233
NEW YORK | Accumulated Depreciation And Amortization Description [Member] | Rego Park One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	2,783
Land	2,104
Building and Improvements	679
Total Investment in Real Estate	2,783
Accumulated Depreciation and Amortization	$ 213
Date of Initial Leasehold or Acquisition Investment	2,013
NEW YORK | Accumulated Depreciation And Amortization Description [Member] | Riverhead One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 724
Land	432
Building and Improvements	292
Total Investment in Real Estate	724
Accumulated Depreciation and Amortization	$ 241
Date of Initial Leasehold or Acquisition Investment	1,998
NEW YORK | Accumulated Depreciation And Amortization Description [Member] | Rockaway Park One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,605
Land	1,605
Total Investment in Real Estate	$ 1,605
Date of Initial Leasehold or Acquisition Investment	2,013
NEW YORK | Accumulated Depreciation And Amortization Description [Member] | Rockville Centre One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 350
Cost Capitalized Subsequent to Initial Investment	66
Land	201
Building and Improvements	215
Total Investment in Real Estate	416
Accumulated Depreciation and Amortization	$ 197
Date of Initial Leasehold or Acquisition Investment	1,985
NEW YORK | Accumulated Depreciation And Amortization Description [Member] | Rye One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 872
Land	872
Total Investment in Real Estate	$ 872
Date of Initial Leasehold or Acquisition Investment	2,011
NEW YORK | Accumulated Depreciation And Amortization Description [Member] | Sag Harbor One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 704
Cost Capitalized Subsequent to Initial Investment	35
Land	458
Building and Improvements	281
Total Investment in Real Estate	739
Accumulated Depreciation and Amortization	$ 241
Date of Initial Leasehold or Acquisition Investment	1,985
NEW YORK | Accumulated Depreciation And Amortization Description [Member] | Sayville One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 344
Cost Capitalized Subsequent to Initial Investment	246
Land	300
Building and Improvements	290
Total Investment in Real Estate	590
Accumulated Depreciation and Amortization	$ 134
Date of Initial Leasehold or Acquisition Investment	1,998
NEW YORK | Accumulated Depreciation And Amortization Description [Member] | Scarsdale One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,301
Land	1,301
Total Investment in Real Estate	$ 1,301
Date of Initial Leasehold or Acquisition Investment	2,011
NEW YORK | Accumulated Depreciation And Amortization Description [Member] | Shrub Oak One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,061
Cost Capitalized Subsequent to Initial Investment	368
Land	691
Building and Improvements	738
Total Investment in Real Estate	1,429
Accumulated Depreciation and Amortization	$ 511
Date of Initial Leasehold or Acquisition Investment	1,985
NEW YORK | Accumulated Depreciation And Amortization Description [Member] | Sleepy Hollow One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 281
Cost Capitalized Subsequent to Initial Investment	301
Land	130
Building and Improvements	452
Total Investment in Real Estate	582
Accumulated Depreciation and Amortization	$ 392
Date of Initial Leasehold or Acquisition Investment	1,969
NEW YORK | Accumulated Depreciation And Amortization Description [Member] | Spring Valley One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 749
Land	749
Total Investment in Real Estate	$ 749
Date of Initial Leasehold or Acquisition Investment	2,011
NEW YORK | Accumulated Depreciation And Amortization Description [Member] | St Albans One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 330
Cost Capitalized Subsequent to Initial Investment	106
Land	215
Building and Improvements	221
Total Investment in Real Estate	436
Accumulated Depreciation and Amortization	$ 183
Date of Initial Leasehold or Acquisition Investment	1,985
NEW YORK | Accumulated Depreciation And Amortization Description [Member] | Staten Island One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 390
Cost Capitalized Subsequent to Initial Investment	89
Land	254
Building and Improvements	225
Total Investment in Real Estate	479
Accumulated Depreciation and Amortization	$ 203
Date of Initial Leasehold or Acquisition Investment	1,985
NEW YORK | Accumulated Depreciation And Amortization Description [Member] | Staten Island Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 301
Cost Capitalized Subsequent to Initial Investment	323
Land	196
Building and Improvements	428
Total Investment in Real Estate	624
Accumulated Depreciation and Amortization	$ 263
Date of Initial Leasehold or Acquisition Investment	1,985
NEW YORK | Accumulated Depreciation And Amortization Description [Member] | Staten Island Three [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 350
Cost Capitalized Subsequent to Initial Investment	290
Land	228
Building and Improvements	412
Total Investment in Real Estate	640
Accumulated Depreciation and Amortization	$ 244
Date of Initial Leasehold or Acquisition Investment	1,985
NEW YORK | Accumulated Depreciation And Amortization Description [Member] | Stony Brook One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 176
Cost Capitalized Subsequent to Initial Investment	281
Land	105
Building and Improvements	352
Total Investment in Real Estate	457
Accumulated Depreciation and Amortization	$ 210
Date of Initial Leasehold or Acquisition Investment	1,978
NEW YORK | Accumulated Depreciation And Amortization Description [Member] | Tarrytown One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 956
Land	956
Total Investment in Real Estate	$ 956
Date of Initial Leasehold or Acquisition Investment	2,011
NEW YORK | Accumulated Depreciation And Amortization Description [Member] | Tuchahoe One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,650
Land	1,650
Total Investment in Real Estate	$ 1,650
Date of Initial Leasehold or Acquisition Investment	2,011
NEW YORK | Accumulated Depreciation And Amortization Description [Member] | Wantagh [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 640
Land	370
Building and Improvements	270
Total Investment in Real Estate	640
Accumulated Depreciation and Amortization	$ 219
Date of Initial Leasehold or Acquisition Investment	1,998
NEW YORK | Accumulated Depreciation And Amortization Description [Member] | Wappingers Falls Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 452
Building and Improvements	452
Total Investment in Real Estate	452
Accumulated Depreciation and Amortization	$ 323
Date of Initial Leasehold or Acquisition Investment	2,011
NEW YORK | Accumulated Depreciation And Amortization Description [Member] | Wappingers Falls One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,488
Land	1,488
Total Investment in Real Estate	$ 1,488
Date of Initial Leasehold or Acquisition Investment	2,011
NEW YORK | Accumulated Depreciation And Amortization Description [Member] | Warsaw One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 990
Land	690
Building and Improvements	300
Total Investment in Real Estate	990
Accumulated Depreciation and Amortization	$ 154
Date of Initial Leasehold or Acquisition Investment	2,006
NEW YORK | Accumulated Depreciation And Amortization Description [Member] | Warwick One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,049
Land	1,049
Total Investment in Real Estate	$ 1,049
Date of Initial Leasehold or Acquisition Investment	2,011
NEW YORK | Accumulated Depreciation And Amortization Description [Member] | West Nyack [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 936
Land	936
Total Investment in Real Estate	$ 936
Date of Initial Leasehold or Acquisition Investment	2,011
NEW YORK | Accumulated Depreciation And Amortization Description [Member] | White Plains [Member]
Schedule Of Investments In Real Estate [Line Items]
Cost Capitalized Subsequent to Initial Investment	$ 569
Land	303
Building and Improvements	266
Total Investment in Real Estate	569
Accumulated Depreciation and Amortization	$ 204
Date of Initial Leasehold or Acquisition Investment	1,972
NEW YORK | Accumulated Depreciation And Amortization Description [Member] | White Plains One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,458
Land	1,458
Total Investment in Real Estate	$ 1,458
Date of Initial Leasehold or Acquisition Investment	2,011
NEW YORK | Accumulated Depreciation And Amortization Description [Member] | Yaphank [Member]
Schedule Of Investments In Real Estate [Line Items]
Cost Capitalized Subsequent to Initial Investment	$ 798
Land	375
Building and Improvements	423
Total Investment in Real Estate	798
Accumulated Depreciation and Amortization	$ 182
Date of Initial Leasehold or Acquisition Investment	1,993
NEW YORK | Accumulated Depreciation And Amortization Description [Member] | Yonkers One [Member]
Schedule Of Investments In Real Estate [Line Items]
Cost Capitalized Subsequent to Initial Investment	$ 588
Building and Improvements	588
Total Investment in Real Estate	588
Accumulated Depreciation and Amortization	$ 345
Date of Initial Leasehold or Acquisition Investment	1,970
NEW YORK | Accumulated Depreciation And Amortization Description [Member] | Yonkers Two [Members]
Schedule Of Investments In Real Estate [Line Items]
Cost Capitalized Subsequent to Initial Investment	$ 944
Land	684
Building and Improvements	260
Total Investment in Real Estate	944
Accumulated Depreciation and Amortization	$ 114
Date of Initial Leasehold or Acquisition Investment	1,990
NEW YORK | Accumulated Depreciation And Amortization Description [Member] | Yonkers Five [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,021
Cost Capitalized Subsequent to Initial Investment	63
Land	665
Building and Improvements	419
Total Investment in Real Estate	1,084
Accumulated Depreciation and Amortization	$ 361
Date of Initial Leasehold or Acquisition Investment	1,985
NEW YORK | Accumulated Depreciation And Amortization Description [Member] | Yonkers Three [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 291
Cost Capitalized Subsequent to Initial Investment	1,050
Land	216
Building and Improvements	1,125
Total Investment in Real Estate	1,341
Accumulated Depreciation and Amortization	$ 542
Date of Initial Leasehold or Acquisition Investment	1,972
NEW YORK | Accumulated Depreciation And Amortization Description [Member] | Yonkers Four [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,907
Land	1,907
Total Investment in Real Estate	$ 1,907
Date of Initial Leasehold or Acquisition Investment	2,011
NEW YORK | Accumulated Depreciation And Amortization Description [Member] | Yorktown Heights One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,700
Building and Improvements	1,700
Total Investment in Real Estate	1,700
Accumulated Depreciation and Amortization	$ 274
Date of Initial Leasehold or Acquisition Investment	2,013
NEW YORK | Accumulated Depreciation And Amortization Description [Member] | Yorktown Heights Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 2,365
Land	2,365
Total Investment in Real Estate	$ 2,365
Date of Initial Leasehold or Acquisition Investment	2,011
OHIO | Accumulated Depreciation And Amortization Description [Member] | Clermont [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,045
Land	362
Building and Improvements	683
Total Investment in Real Estate	1,045
Accumulated Depreciation and Amortization	$ 64
Date of Initial Leasehold or Acquisition Investment	2,017
OHIO | Accumulated Depreciation And Amortization Description [Member] | Crestline One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,202
Land	285
Building and Improvements	917
Total Investment in Real Estate	1,202
Accumulated Depreciation and Amortization	$ 463
Date of Initial Leasehold or Acquisition Investment	2,008
OHIO | Accumulated Depreciation And Amortization Description [Member] | Mansfield One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 922
Land	332
Building and Improvements	590
Total Investment in Real Estate	922
Accumulated Depreciation and Amortization	$ 280
Date of Initial Leasehold or Acquisition Investment	2,008
OHIO | Accumulated Depreciation And Amortization Description [Member] | Mansfield Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,950
Land	700
Building and Improvements	1,250
Total Investment in Real Estate	1,950
Accumulated Depreciation and Amortization	$ 587
Date of Initial Leasehold or Acquisition Investment	2,009
OHIO | Accumulated Depreciation And Amortization Description [Member] | Monroeville One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 2,580
Land	485
Building and Improvements	2,095
Total Investment in Real Estate	2,580
Accumulated Depreciation and Amortization	$ 970
Date of Initial Leasehold or Acquisition Investment	2,009
OHIO | Accumulated Depreciation And Amortization Description [Member] | Summit [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,530
Land	385
Building and Improvements	1,145
Total Investment in Real Estate	1,530
Accumulated Depreciation and Amortization	$ 95
Date of Initial Leasehold or Acquisition Investment	2,017
OKLAHOMA | Accumulated Depreciation And Amortization Description [Member] | Oklahoma City One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 868
Land	371
Building and Improvements	497
Total Investment in Real Estate	868
Accumulated Depreciation and Amortization	$ 19
Date of Initial Leasehold or Acquisition Investment	2,018
OKLAHOMA | Accumulated Depreciation And Amortization Description [Member] | Oklahoma City Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,182
Land	587
Building and Improvements	595
Total Investment in Real Estate	1,182
Accumulated Depreciation and Amortization	$ 22
Date of Initial Leasehold or Acquisition Investment	2,018
OKLAHOMA | Accumulated Depreciation And Amortization Description [Member] | Oklahoma City Three [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,311
Land	625
Building and Improvements	686
Total Investment in Real Estate	1,311
Accumulated Depreciation and Amortization	$ 24
Date of Initial Leasehold or Acquisition Investment	2,018
OREGON | Accumulated Depreciation And Amortization Description [Member] | Banks One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 498
Land	498
Total Investment in Real Estate	$ 498
Date of Initial Leasehold or Acquisition Investment	2,015
OREGON | Accumulated Depreciation And Amortization Description [Member] | Estacada One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 646
Land	84
Building and Improvements	562
Total Investment in Real Estate	646
Accumulated Depreciation and Amortization	$ 109
Date of Initial Leasehold or Acquisition Investment	2,015
OREGON | Accumulated Depreciation And Amortization Description [Member] | Marion One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 543
Land	296
Building and Improvements	247
Total Investment in Real Estate	543
Accumulated Depreciation and Amortization	$ 29
Date of Initial Leasehold or Acquisition Investment	2,017
OREGON | Accumulated Depreciation And Amortization Description [Member] | Marion Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 956
Land	456
Building and Improvements	500
Total Investment in Real Estate	956
Accumulated Depreciation and Amortization	$ 50
Date of Initial Leasehold or Acquisition Investment	2,017
OREGON | Accumulated Depreciation And Amortization Description [Member] | Pendleton One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 766
Land	122
Building and Improvements	644
Total Investment in Real Estate	766
Accumulated Depreciation and Amortization	$ 138
Date of Initial Leasehold or Acquisition Investment	2,015
OREGON | Accumulated Depreciation And Amortization Description [Member] | Portland One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 4,416
Land	3,368
Building and Improvements	1,048
Total Investment in Real Estate	4,416
Accumulated Depreciation and Amortization	$ 213
Date of Initial Leasehold or Acquisition Investment	2,015

Schedule III - Real Estate a_19

Schedule III - Real Estate and Accumulated Depreciation and Amortization Part 18 (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Schedule Of Investments In Real Estate [Line Items]
Total Investment in Real Estate	$ 1,043,106	$ 970,964	$ 782,166	$ 783,233
OREGON | Accumulated Depreciation And Amortization Description [Member] | Salem One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	1,071
Land	399
Building and Improvements	672
Total Investment in Real Estate	1,071
Accumulated Depreciation and Amortization	$ 174
Date of Initial Leasehold or Acquisition Investment	2,015
OREGON | Accumulated Depreciation And Amortization Description [Member] | Salem Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,350
Land	521
Building and Improvements	829
Total Investment in Real Estate	1,350
Accumulated Depreciation and Amortization	$ 172
Date of Initial Leasehold or Acquisition Investment	2,015
OREGON | Accumulated Depreciation And Amortization Description [Member] | Salem Three [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,408
Land	524
Building and Improvements	884
Total Investment in Real Estate	1,408
Accumulated Depreciation and Amortization	$ 190
Date of Initial Leasehold or Acquisition Investment	2,015
OREGON | Accumulated Depreciation And Amortization Description [Member] | Salem Four [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 4,215
Land	3,182
Building and Improvements	1,033
Total Investment in Real Estate	4,215
Accumulated Depreciation and Amortization	$ 226
Date of Initial Leasehold or Acquisition Investment	2,015
OREGON | Accumulated Depreciation And Amortization Description [Member] | Salem Five [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 4,614
Land	3,517
Building and Improvements	1,097
Total Investment in Real Estate	4,614
Accumulated Depreciation and Amortization	$ 225
Date of Initial Leasehold or Acquisition Investment	2,015
OREGON | Accumulated Depreciation And Amortization Description [Member] | Springfield One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,398
Land	796
Building and Improvements	602
Total Investment in Real Estate	1,398
Accumulated Depreciation and Amortization	$ 152
Date of Initial Leasehold or Acquisition Investment	2,015
OREGON | Accumulated Depreciation And Amortization Description [Member] | Yamhill
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 2,867
Land	394
Building and Improvements	2,473
Total Investment in Real Estate	2,867
Accumulated Depreciation and Amortization	$ 192
Date of Initial Leasehold or Acquisition Investment	2,017
PA [Member] | Accumulated Depreciation And Amortization Description [Member] | Allison Park One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,500
Land	850
Building and Improvements	650
Total Investment in Real Estate	1,500
Accumulated Depreciation and Amortization	$ 444
Date of Initial Leasehold or Acquisition Investment	2,010
PA [Member] | Accumulated Depreciation And Amortization Description [Member] | Harrisburg One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 399
Cost Capitalized Subsequent to Initial Investment	213
Land	199
Building and Improvements	413
Total Investment in Real Estate	612
Accumulated Depreciation and Amortization	$ 329
Date of Initial Leasehold or Acquisition Investment	1,989
PA [Member] | Accumulated Depreciation And Amortization Description [Member] | Lancaster One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 642
Cost Capitalized Subsequent to Initial Investment	18
Land	300
Building and Improvements	360
Total Investment in Real Estate	660
Accumulated Depreciation and Amortization	$ 360
Date of Initial Leasehold or Acquisition Investment	1,989
PA [Member] | Accumulated Depreciation And Amortization Description [Member] | New Kensington One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,375
Land	675
Building and Improvements	700
Total Investment in Real Estate	1,375
Accumulated Depreciation and Amortization	$ 269
Date of Initial Leasehold or Acquisition Investment	2,010
PA [Member] | Accumulated Depreciation And Amortization Description [Member] | Philadelphia One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 405
Cost Capitalized Subsequent to Initial Investment	175
Land	264
Building and Improvements	316
Total Investment in Real Estate	580
Accumulated Depreciation and Amortization	$ 263
Date of Initial Leasehold or Acquisition Investment	1,985
PA [Member] | Accumulated Depreciation And Amortization Description [Member] | Philadelphia Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,252
Land	814
Building and Improvements	438
Total Investment in Real Estate	1,252
Accumulated Depreciation and Amortization	$ 177
Date of Initial Leasehold or Acquisition Investment	2,009
PA [Member] | Accumulated Depreciation And Amortization Description [Member] | Phoenixville [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 385
Cost Capitalized Subsequent to Initial Investment	89
Land	76
Building and Improvements	398
Total Investment in Real Estate	474
Accumulated Depreciation and Amortization	$ 27
Date of Initial Leasehold or Acquisition Investment	1,985
PA [Member] | Accumulated Depreciation And Amortization Description [Member] | Pottsville One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 452
Cost Capitalized Subsequent to Initial Investment	1
Land	148
Building and Improvements	305
Total Investment in Real Estate	453
Accumulated Depreciation and Amortization	$ 304
Date of Initial Leasehold or Acquisition Investment	1,990
PA [Member] | Accumulated Depreciation And Amortization Description [Member] | Reading One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 750
Cost Capitalized Subsequent to Initial Investment	49
Building and Improvements	799
Total Investment in Real Estate	799
Accumulated Depreciation and Amortization	$ 799
Date of Initial Leasehold or Acquisition Investment	1,989
RHODE ISLAND | Accumulated Depreciation And Amortization Description [Member] | Barrington One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 490
Cost Capitalized Subsequent to Initial Investment	180
Land	319
Building and Improvements	351
Total Investment in Real Estate	670
Accumulated Depreciation and Amortization	$ 266
Date of Initial Leasehold or Acquisition Investment	1,985
RHODE ISLAND | Accumulated Depreciation And Amortization Description [Member] | East Providence One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 2,298
Cost Capitalized Subsequent to Initial Investment	(1,855)
Land	14
Building and Improvements	429
Total Investment in Real Estate	443
Accumulated Depreciation and Amortization	$ 74
Date of Initial Leasehold or Acquisition Investment	1,985
RHODE ISLAND | Accumulated Depreciation And Amortization Description [Member] | N. Providence [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 543
Cost Capitalized Subsequent to Initial Investment	158
Land	353
Building and Improvements	348
Total Investment in Real Estate	701
Accumulated Depreciation and Amortization	$ 255
Date of Initial Leasehold or Acquisition Investment	1,985
SOUTH CAROLINA | Accumulated Depreciation And Amortization Description [Member] | Columbia One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,995
Land	1,130
Building and Improvements	865
Total Investment in Real Estate	1,995
Accumulated Depreciation and Amortization	$ 21
Date of Initial Leasehold or Acquisition Investment	2,018
SOUTH CAROLINA | Accumulated Depreciation And Amortization Description [Member] | Columbia Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 2,109
Land	1,120
Building and Improvements	989
Total Investment in Real Estate	2,109
Accumulated Depreciation and Amortization	$ 23
Date of Initial Leasehold or Acquisition Investment	2,018
SOUTH CAROLINA | Accumulated Depreciation And Amortization Description [Member] | Columbia Three [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 2,531
Land	1,612
Building and Improvements	919
Total Investment in Real Estate	2,531
Accumulated Depreciation and Amortization	$ 21
Date of Initial Leasehold or Acquisition Investment	2,018
SOUTH CAROLINA | Accumulated Depreciation And Amortization Description [Member] | Johns Island
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 2,561
Land	1,885
Building and Improvements	676
Total Investment in Real Estate	2,561
Accumulated Depreciation and Amortization	$ 6
Date of Initial Leasehold or Acquisition Investment	2,018
SOUTH CAROLINA | Accumulated Depreciation And Amortization Description [Member] | Kershaw One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 2,082
Land	1,166
Building and Improvements	916
Total Investment in Real Estate	2,082
Accumulated Depreciation and Amortization	$ 68
Date of Initial Leasehold or Acquisition Investment	2,017
SOUTH CAROLINA | Accumulated Depreciation And Amortization Description [Member] | Kershaw Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 2,177
Land	974
Building and Improvements	1,203
Total Investment in Real Estate	2,177
Accumulated Depreciation and Amortization	$ 84
Date of Initial Leasehold or Acquisition Investment	2,017
SOUTH CAROLINA | Accumulated Depreciation And Amortization Description [Member] | Lexington One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 412
Land	145
Building and Improvements	267
Total Investment in Real Estate	412
Accumulated Depreciation and Amortization	$ 19
Date of Initial Leasehold or Acquisition Investment	2,017
SOUTH CAROLINA | Accumulated Depreciation And Amortization Description [Member] | Lexington Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 633
Land	309
Building and Improvements	324
Total Investment in Real Estate	633
Accumulated Depreciation and Amortization	$ 24
Date of Initial Leasehold or Acquisition Investment	2,017
SOUTH CAROLINA | Accumulated Depreciation And Amortization Description [Member] | Lexington Three [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 412
Land	145
Building and Improvements	267
Total Investment in Real Estate	412
Accumulated Depreciation and Amortization	$ 19
Date of Initial Leasehold or Acquisition Investment	2,017
SOUTH CAROLINA | Accumulated Depreciation And Amortization Description [Member] | Lexington Four [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 633
Land	309
Building and Improvements	324
Total Investment in Real Estate	633
Accumulated Depreciation and Amortization	$ 24
Date of Initial Leasehold or Acquisition Investment	2,017
SOUTH CAROLINA | Accumulated Depreciation And Amortization Description [Member] | Lexington Five [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 694
Land	172
Building and Improvements	522
Total Investment in Real Estate	694
Accumulated Depreciation and Amortization	$ 41
Date of Initial Leasehold or Acquisition Investment	2,017
SOUTH CAROLINA | Accumulated Depreciation And Amortization Description [Member] | Lexington Six [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 720
Land	219
Building and Improvements	501
Total Investment in Real Estate	720
Accumulated Depreciation and Amortization	$ 35
Date of Initial Leasehold or Acquisition Investment	2,017
SOUTH CAROLINA | Accumulated Depreciation And Amortization Description [Member] | Lexington Seven [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 816
Land	336
Building and Improvements	480
Total Investment in Real Estate	816
Accumulated Depreciation and Amortization	$ 27
Date of Initial Leasehold or Acquisition Investment	2,017
SOUTH CAROLINA | Accumulated Depreciation And Amortization Description [Member] | Lexington Eight [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 973
Land	582
Building and Improvements	391
Total Investment in Real Estate	973
Accumulated Depreciation and Amortization	$ 30
Date of Initial Leasehold or Acquisition Investment	2,017
SOUTH CAROLINA | Accumulated Depreciation And Amortization Description [Member] | Lexington Nine [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,036
Land	434
Building and Improvements	602
Total Investment in Real Estate	1,036
Accumulated Depreciation and Amortization	$ 42
Date of Initial Leasehold or Acquisition Investment	2,017
SOUTH CAROLINA | Accumulated Depreciation And Amortization Description [Member] | Lexington Ten [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,056
Land	432
Building and Improvements	624
Total Investment in Real Estate	1,056
Accumulated Depreciation and Amortization	$ 47
Date of Initial Leasehold or Acquisition Investment	2,017
SOUTH CAROLINA | Accumulated Depreciation And Amortization Description [Member] | Lexington Eleven [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,116
Land	50
Building and Improvements	1,066
Total Investment in Real Estate	1,116
Accumulated Depreciation and Amortization	$ 77
Date of Initial Leasehold or Acquisition Investment	2,017
SOUTH CAROLINA | Accumulated Depreciation And Amortization Description [Member] | Lexington Twelve [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,436
Land	472
Building and Improvements	964
Total Investment in Real Estate	1,436
Accumulated Depreciation and Amortization	$ 70
Date of Initial Leasehold or Acquisition Investment	2,017
SOUTH CAROLINA | Accumulated Depreciation And Amortization Description [Member] | Lexington Thirteen [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,624
Land	999
Building and Improvements	625
Total Investment in Real Estate	1,624
Accumulated Depreciation and Amortization	$ 45
Date of Initial Leasehold or Acquisition Investment	2,017
SOUTH CAROLINA | Accumulated Depreciation And Amortization Description [Member] | Lexington Fourteen [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,644
Land	1,283
Building and Improvements	361
Total Investment in Real Estate	1,644
Accumulated Depreciation and Amortization	$ 27
Date of Initial Leasehold or Acquisition Investment	2,017
SOUTH CAROLINA | Accumulated Depreciation And Amortization Description [Member] | Lexington Fifteen [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,682
Land	1,135
Building and Improvements	547
Total Investment in Real Estate	1,682
Accumulated Depreciation and Amortization	$ 43
Date of Initial Leasehold or Acquisition Investment	2,017
SOUTH CAROLINA | Accumulated Depreciation And Amortization Description [Member] | Lexington Sixteen [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,712
Land	1,410
Building and Improvements	302
Total Investment in Real Estate	1,712
Accumulated Depreciation and Amortization	$ 19
Date of Initial Leasehold or Acquisition Investment	2,017
SOUTH CAROLINA | Accumulated Depreciation And Amortization Description [Member] | Lexington Seventeen [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,729
Land	1,268
Building and Improvements	461
Total Investment in Real Estate	1,729
Accumulated Depreciation and Amortization	$ 39
Date of Initial Leasehold or Acquisition Investment	2,017
SOUTH CAROLINA | Accumulated Depreciation And Amortization Description [Member] | Lexington Eighteen [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,738
Land	1,189
Building and Improvements	549
Total Investment in Real Estate	1,738
Accumulated Depreciation and Amortization	$ 31
Date of Initial Leasehold or Acquisition Investment	2,017
SOUTH CAROLINA | Accumulated Depreciation And Amortization Description [Member] | Lexington Nineteen [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,901
Land	1,021
Building and Improvements	880
Total Investment in Real Estate	1,901
Accumulated Depreciation and Amortization	$ 73
Date of Initial Leasehold or Acquisition Investment	2,017
SOUTH CAROLINA | Accumulated Depreciation And Amortization Description [Member] | Lexington Twenty [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 2,046
Land	746
Building and Improvements	1,300
Total Investment in Real Estate	2,046
Accumulated Depreciation and Amortization	$ 90
Date of Initial Leasehold or Acquisition Investment	2,017
SOUTH CAROLINA | Accumulated Depreciation And Amortization Description [Member] | Lexington Twenty One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 2,179
Land	1,476
Building and Improvements	703
Total Investment in Real Estate	2,179
Accumulated Depreciation and Amortization	$ 50
Date of Initial Leasehold or Acquisition Investment	2,017
SOUTH CAROLINA | Accumulated Depreciation And Amortization Description [Member] | Lexington Twenty Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 2,230
Land	934
Building and Improvements	1,296
Total Investment in Real Estate	2,230
Accumulated Depreciation and Amortization	$ 92
Date of Initial Leasehold or Acquisition Investment	2,017
SOUTH CAROLINA | Accumulated Depreciation And Amortization Description [Member] | Lexington Twenty Three [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 2,603
Land	1,869
Building and Improvements	734
Total Investment in Real Estate	2,603
Accumulated Depreciation and Amortization	$ 19
Date of Initial Leasehold or Acquisition Investment	2,018

Schedule III - Real Estate a_20

Schedule III - Real Estate and Accumulated Depreciation and Amortization Part 19 (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Schedule Of Investments In Real Estate [Line Items]
Total Investment in Real Estate	$ 1,043,106	$ 970,964	$ 782,166	$ 783,233
Accumulated Depreciation And Amortization Description [Member] | Miscellaneous [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	45,846
Cost Capitalized Subsequent to Initial Investment	15,133
Land	21,703
Building and Improvements	39,276
Total Investment in Real Estate	60,979
Accumulated Depreciation and Amortization	26,242
TEXAS | Accumulated Depreciation And Amortization Description [Member] | Garland Three [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	4,439
Land	439
Building and Improvements	4,000
Total Investment in Real Estate	4,439
Accumulated Depreciation and Amortization	$ 754
Date of Initial Leasehold or Acquisition Investment	2,014
TEXAS | Accumulated Depreciation And Amortization Description [Member] | Grand Prairie One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,413
Land	914
Building and Improvements	499
Total Investment in Real Estate	1,413
Accumulated Depreciation and Amortization	$ 20
Date of Initial Leasehold or Acquisition Investment	2,018
TEXAS | Accumulated Depreciation And Amortization Description [Member] | Grand Prairie Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 2,000
Land	1,415
Building and Improvements	585
Total Investment in Real Estate	2,000
Accumulated Depreciation and Amortization	$ 22
Date of Initial Leasehold or Acquisition Investment	2,018
TEXAS | Accumulated Depreciation And Amortization Description [Member] | EL Paso Four [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,679
Land	1,085
Building and Improvements	594
Total Investment in Real Estate	1,679
Accumulated Depreciation and Amortization	$ 45
Date of Initial Leasehold or Acquisition Investment	2,017
TEXAS | Accumulated Depreciation And Amortization Description [Member] | EL Paso Five [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,816
Land	1,413
Building and Improvements	403
Total Investment in Real Estate	1,816
Accumulated Depreciation and Amortization	$ 35
Date of Initial Leasehold or Acquisition Investment	2,017
TEXAS | Accumulated Depreciation And Amortization Description [Member] | EL Paso Six [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 2,370
Land	1,767
Building and Improvements	603
Total Investment in Real Estate	2,370
Accumulated Depreciation and Amortization	$ 47
Date of Initial Leasehold or Acquisition Investment	2,017
TEXAS | Accumulated Depreciation And Amortization Description [Member] | Ft Worth One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 2,115
Cost Capitalized Subsequent to Initial Investment	49
Land	866
Building and Improvements	1,298
Total Investment in Real Estate	2,164
Accumulated Depreciation and Amortization	$ 721
Date of Initial Leasehold or Acquisition Investment	2,007
TEXAS | Accumulated Depreciation And Amortization Description [Member] | Garland One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 2,208
Land	1,504
Building and Improvements	704
Total Investment in Real Estate	2,208
Accumulated Depreciation and Amortization	$ 26
Date of Initial Leasehold or Acquisition Investment	2,018
TEXAS | Accumulated Depreciation And Amortization Description [Member] | Garland Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 3,296
Land	245
Building and Improvements	3,051
Total Investment in Real Estate	3,296
Accumulated Depreciation and Amortization	$ 550
Date of Initial Leasehold or Acquisition Investment	2,014
TEXAS | Accumulated Depreciation And Amortization Description [Member] | Linden [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 2,160
Land	1,514
Building and Improvements	646
Total Investment in Real Estate	2,160
Accumulated Depreciation and Amortization	$ 25
Date of Initial Leasehold or Acquisition Investment	2,018
TEXAS | Accumulated Depreciation And Amortization Description [Member] | Harker Heights One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 2,051
Cost Capitalized Subsequent to Initial Investment	(9)
Land	579
Building and Improvements	1,463
Total Investment in Real Estate	2,042
Accumulated Depreciation and Amortization	$ 1,144
Date of Initial Leasehold or Acquisition Investment	2,007
TEXAS | Accumulated Depreciation And Amortization Description [Member] | Longview [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,660
Land	1,239
Building and Improvements	421
Total Investment in Real Estate	1,660
Accumulated Depreciation and Amortization	$ 16
Date of Initial Leasehold or Acquisition Investment	2,018
TEXAS | Accumulated Depreciation And Amortization Description [Member] | Houston One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,689
Land	224
Building and Improvements	1,465
Total Investment in Real Estate	1,689
Accumulated Depreciation and Amortization	$ 735
Date of Initial Leasehold or Acquisition Investment	2,007
TEXAS | Accumulated Depreciation And Amortization Description [Member] | Mesquite
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,687
Land	1,093
Building and Improvements	594
Total Investment in Real Estate	1,687
Accumulated Depreciation and Amortization	$ 23
Date of Initial Leasehold or Acquisition Investment	2,018
TEXAS | Accumulated Depreciation And Amortization Description [Member] | Houston Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 2,803
Land	535
Building and Improvements	2,268
Total Investment in Real Estate	2,803
Accumulated Depreciation and Amortization	$ 220
Date of Initial Leasehold or Acquisition Investment	2,016
TEXAS | Accumulated Depreciation And Amortization Description [Member] | Keller One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 2,507
Land	996
Building and Improvements	1,511
Total Investment in Real Estate	2,507
Accumulated Depreciation and Amortization	$ 827
Date of Initial Leasehold or Acquisition Investment	2,007
TEXAS | Accumulated Depreciation And Amortization Description [Member] | Nueces One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,526
Land	1,056
Building and Improvements	470
Total Investment in Real Estate	1,526
Accumulated Depreciation and Amortization	$ 36
Date of Initial Leasehold or Acquisition Investment	2,017
TEXAS | Accumulated Depreciation And Amortization Description [Member] | Lewisville One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 494
Land	110
Building and Improvements	384
Total Investment in Real Estate	494
Accumulated Depreciation and Amortization	$ 239
Date of Initial Leasehold or Acquisition Investment	2,008
TEXAS | Accumulated Depreciation And Amortization Description [Member] | Nueces Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 2,162
Land	1,729
Building and Improvements	433
Total Investment in Real Estate	2,162
Accumulated Depreciation and Amortization	$ 37
Date of Initial Leasehold or Acquisition Investment	2,017
TEXAS | Accumulated Depreciation And Amortization Description [Member] | Nueces Three [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 2,400
Land	1,110
Building and Improvements	1,290
Total Investment in Real Estate	2,400
Accumulated Depreciation and Amortization	$ 99
Date of Initial Leasehold or Acquisition Investment	2,017
TEXAS | Accumulated Depreciation And Amortization Description [Member] | Midlothian One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 429
Land	72
Building and Improvements	357
Total Investment in Real Estate	429
Accumulated Depreciation and Amortization	$ 229
Date of Initial Leasehold or Acquisition Investment	2,007
TEXAS | Accumulated Depreciation And Amortization Description [Member] | Port Arthur One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 2,648
Land	505
Building and Improvements	2,143
Total Investment in Real Estate	2,648
Accumulated Depreciation and Amortization	$ 215
Date of Initial Leasehold or Acquisition Investment	2,016
TEXAS | Accumulated Depreciation And Amortization Description [Member] | Rowlett [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,284
Land	840
Building and Improvements	444
Total Investment in Real Estate	1,284
Accumulated Depreciation and Amortization	$ 16
Date of Initial Leasehold or Acquisition Investment	2,018
TEXAS | Accumulated Depreciation And Amortization Description [Member] | San Marcos One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,954
Land	251
Building and Improvements	1,703
Total Investment in Real Estate	1,954
Accumulated Depreciation and Amortization	$ 874
Date of Initial Leasehold or Acquisition Investment	2,007
TEXAS | Accumulated Depreciation And Amortization Description [Member] | San Patricio [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 3,138
Land	2,687
Building and Improvements	451
Total Investment in Real Estate	3,138
Accumulated Depreciation and Amortization	$ 39
Date of Initial Leasehold or Acquisition Investment	2,017
TEXAS | Accumulated Depreciation And Amortization Description [Member] | Temple One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 2,405
Cost Capitalized Subsequent to Initial Investment	(10)
Land	1,205
Building and Improvements	1,190
Total Investment in Real Estate	2,395
Accumulated Depreciation and Amortization	$ 664
Date of Initial Leasehold or Acquisition Investment	2,007
TEXAS | Accumulated Depreciation And Amortization Description [Member] | The Colony One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 4,396
Land	337
Building and Improvements	4,059
Total Investment in Real Estate	4,396
Accumulated Depreciation and Amortization	$ 1,992
Date of Initial Leasehold or Acquisition Investment	2,007
TEXAS | Accumulated Depreciation And Amortization Description [Member] | Texarkana [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,791
Land	992
Building and Improvements	799
Total Investment in Real Estate	1,791
Accumulated Depreciation and Amortization	$ 29
Date of Initial Leasehold or Acquisition Investment	2,018
TEXAS | Accumulated Depreciation And Amortization Description [Member] | Waco One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 3,884
Land	894
Building and Improvements	2,990
Total Investment in Real Estate	3,884
Accumulated Depreciation and Amortization	$ 1,674
Date of Initial Leasehold or Acquisition Investment	2,007
TEXAS | Accumulated Depreciation And Amortization Description [Member] | Texarkana One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,861
Land	1,197
Building and Improvements	664
Total Investment in Real Estate	1,861
Accumulated Depreciation and Amortization	$ 27
Date of Initial Leasehold or Acquisition Investment	2,018
TEXAS | Accumulated Depreciation And Amortization Description [Member] | Texarkana Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 2,316
Land	1,643
Building and Improvements	673
Total Investment in Real Estate	2,316
Accumulated Depreciation and Amortization	$ 24
Date of Initial Leasehold or Acquisition Investment	2,018
TEXAS | Accumulated Depreciation And Amortization Description [Member] | Travis [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,711
Land	1,364
Building and Improvements	347
Total Investment in Real Estate	1,711
Accumulated Depreciation and Amortization	$ 31
Date of Initial Leasehold or Acquisition Investment	2,017
TEXAS | Accumulated Depreciation And Amortization Description [Member] | Wake Village [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,637
Land	685
Building and Improvements	952
Total Investment in Real Estate	1,637
Accumulated Depreciation and Amortization	$ 34
Date of Initial Leasehold or Acquisition Investment	2,018
TEXAS | Accumulated Depreciation And Amortization Description [Member] | Watauga [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,771
Land	1,139
Building and Improvements	632
Total Investment in Real Estate	1,771
Accumulated Depreciation and Amortization	$ 24
Date of Initial Leasehold or Acquisition Investment	2,018
TEXAS | Accumulated Depreciation And Amortization Description [Member] | El Paso Seven [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 3,168
Land	2,153
Building and Improvements	1,015
Total Investment in Real Estate	3,168
Accumulated Depreciation and Amortization	$ 80
Date of Initial Leasehold or Acquisition Investment	2,017
VIRGINIA [Member] | Accumulated Depreciation And Amortization Description [Member] | Alexandria One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 649
Land	649
Total Investment in Real Estate	$ 649
Date of Initial Leasehold or Acquisition Investment	2,013
VIRGINIA [Member] | Accumulated Depreciation And Amortization Description [Member] | Alexandria Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 656
Land	409
Building and Improvements	247
Total Investment in Real Estate	656
Accumulated Depreciation and Amortization	$ 87
Date of Initial Leasehold or Acquisition Investment	2,013
VIRGINIA [Member] | Accumulated Depreciation And Amortization Description [Member] | Alexandria Three [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 712
Land	712
Total Investment in Real Estate	$ 712
Date of Initial Leasehold or Acquisition Investment	2,013
VIRGINIA [Member] | Accumulated Depreciation And Amortization Description [Member] | Alexandria Four [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 735
Land	735
Total Investment in Real Estate	$ 735
Date of Initial Leasehold or Acquisition Investment	2,013
VIRGINIA [Member] | Accumulated Depreciation And Amortization Description [Member] | Alexandria Five [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,327
Land	1,327
Total Investment in Real Estate	$ 1,327
Date of Initial Leasehold or Acquisition Investment	2,013
VIRGINIA [Member] | Accumulated Depreciation And Amortization Description [Member] | Alexandria Six [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,388
Land	1,020
Building and Improvements	368
Total Investment in Real Estate	1,388
Accumulated Depreciation and Amortization	$ 131
Date of Initial Leasehold or Acquisition Investment	2,013
VIRGINIA [Member] | Accumulated Depreciation And Amortization Description [Member] | Alexandria Seven [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,582
Land	1,150
Building and Improvements	432
Total Investment in Real Estate	1,582
Accumulated Depreciation and Amortization	$ 140
Date of Initial Leasehold or Acquisition Investment	2,013
VIRGINIA [Member] | Accumulated Depreciation And Amortization Description [Member] | Alexandria Eight [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,757
Land	1,313
Building and Improvements	444
Total Investment in Real Estate	1,757
Accumulated Depreciation and Amortization	$ 153
Date of Initial Leasehold or Acquisition Investment	2,013
VIRGINIA [Member] | Accumulated Depreciation And Amortization Description [Member] | Annandale One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,718
Land	1,718
Total Investment in Real Estate	$ 1,718
Date of Initial Leasehold or Acquisition Investment	2,013
VIRGINIA [Member] | Accumulated Depreciation And Amortization Description [Member] | Arlington One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,083
Land	1,083
Total Investment in Real Estate	$ 1,083
Date of Initial Leasehold or Acquisition Investment	2,013
VIRGINIA [Member] | Accumulated Depreciation And Amortization Description [Member] | Arlington Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,464
Land	1,085
Building and Improvements	379
Total Investment in Real Estate	1,464
Accumulated Depreciation and Amortization	$ 126
Date of Initial Leasehold or Acquisition Investment	2,013
VIRGINIA [Member] | Accumulated Depreciation And Amortization Description [Member] | Arlington Three [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 2,014
Land	1,516
Building and Improvements	498
Total Investment in Real Estate	2,014
Accumulated Depreciation and Amortization	$ 160
Date of Initial Leasehold or Acquisition Investment	2,013
VIRGINIA [Member] | Accumulated Depreciation And Amortization Description [Member] | Fairfax Four [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 3,348
Land	2,351
Building and Improvements	997
Total Investment in Real Estate	3,348
Accumulated Depreciation and Amortization	$ 302
Date of Initial Leasehold or Acquisition Investment	2,013
VIRGINIA [Member] | Accumulated Depreciation And Amortization Description [Member] | Farmville One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,227
Land	622
Building and Improvements	605
Total Investment in Real Estate	1,227
Accumulated Depreciation and Amortization	$ 333
Date of Initial Leasehold or Acquisition Investment	2,005
VIRGINIA [Member] | Accumulated Depreciation And Amortization Description [Member] | Fredericksburg One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,279
Land	469
Building and Improvements	810
Total Investment in Real Estate	1,279
Accumulated Depreciation and Amortization	$ 446
Date of Initial Leasehold or Acquisition Investment	2,005
VIRGINIA [Member] | Accumulated Depreciation And Amortization Description [Member] | Fredericksburg Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,289
Cost Capitalized Subsequent to Initial Investment	30
Land	798
Building and Improvements	521
Total Investment in Real Estate	1,319
Accumulated Depreciation and Amortization	$ 288
Date of Initial Leasehold or Acquisition Investment	2,005
VIRGINIA [Member] | Accumulated Depreciation And Amortization Description [Member] | Fredericksburg Three [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,716
Land	996
Building and Improvements	720
Total Investment in Real Estate	1,716
Accumulated Depreciation and Amortization	$ 397
Date of Initial Leasehold or Acquisition Investment	2,005
VIRGINIA [Member] | Accumulated Depreciation And Amortization Description [Member] | Fredericksburg Four [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 3,623
Land	2,828
Building and Improvements	795
Total Investment in Real Estate	3,623
Accumulated Depreciation and Amortization	$ 438
Date of Initial Leasehold or Acquisition Investment	2,005
VIRGINIA [Member] | Accumulated Depreciation And Amortization Description [Member] | Glen Allen One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,037
Land	412
Building and Improvements	625
Total Investment in Real Estate	1,037
Accumulated Depreciation and Amortization	$ 344
Date of Initial Leasehold or Acquisition Investment	2,005
VIRGINIA [Member] | Accumulated Depreciation And Amortization Description [Member] | Glen Allen Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,077
Land	322
Building and Improvements	755
Total Investment in Real Estate	1,077
Accumulated Depreciation and Amortization	$ 416
Date of Initial Leasehold or Acquisition Investment	2,005
VIRGINIA [Member] | Accumulated Depreciation And Amortization Description [Member] | King William One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,688
Land	1,068
Building and Improvements	620
Total Investment in Real Estate	1,688
Accumulated Depreciation and Amortization	$ 342
Date of Initial Leasehold or Acquisition Investment	2,005
VIRGINIA [Member] | Accumulated Depreciation And Amortization Description [Member] | Mechanicsville One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 903
Land	273
Building and Improvements	630
Total Investment in Real Estate	903
Accumulated Depreciation and Amortization	$ 347
Date of Initial Leasehold or Acquisition Investment	2,005
VIRGINIA [Member] | Accumulated Depreciation And Amortization Description [Member] | Mechanicsville Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 957
Land	324
Building and Improvements	633
Total Investment in Real Estate	957
Accumulated Depreciation and Amortization	$ 371
Date of Initial Leasehold or Acquisition Investment	2,005
VIRGINIA [Member] | Accumulated Depreciation And Amortization Description [Member] | Mechanicsville Three [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,043
Land	223
Building and Improvements	820
Total Investment in Real Estate	1,043
Accumulated Depreciation and Amortization	$ 452
Date of Initial Leasehold or Acquisition Investment	2,005
VIRGINIA [Member] | Accumulated Depreciation And Amortization Description [Member] | Mechanicsville Four [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,125
Land	505
Building and Improvements	620
Total Investment in Real Estate	1,125
Accumulated Depreciation and Amortization	$ 342
Date of Initial Leasehold or Acquisition Investment	2,005
VIRGINIA [Member] | Accumulated Depreciation And Amortization Description [Member] | Mechanicsville Five [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,476
Land	876
Building and Improvements	600
Total Investment in Real Estate	1,476
Accumulated Depreciation and Amortization	$ 331
Date of Initial Leasehold or Acquisition Investment	2,005
VIRGINIA [Member] | Accumulated Depreciation And Amortization Description [Member] | Mechanicsville Six [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,677
Land	1,157
Building and Improvements	520
Total Investment in Real Estate	1,677
Accumulated Depreciation and Amortization	$ 286
Date of Initial Leasehold or Acquisition Investment	2,005
VIRGINIA [Member] | Accumulated Depreciation And Amortization Description [Member] | Montpelier One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 2,481
Cost Capitalized Subsequent to Initial Investment	(114)
Land	1,612
Building and Improvements	755
Total Investment in Real Estate	2,367
Accumulated Depreciation and Amortization	$ 416
Date of Initial Leasehold or Acquisition Investment	2,005
VIRGINIA [Member] | Accumulated Depreciation And Amortization Description [Member] | Norfolk One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 535
Cost Capitalized Subsequent to Initial Investment	(70)
Land	235
Building and Improvements	230
Total Investment in Real Estate	465
Accumulated Depreciation and Amortization	$ 230
Date of Initial Leasehold or Acquisition Investment	1,990
VIRGINIA [Member] | Accumulated Depreciation And Amortization Description [Member] | Petersburg One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,441
Land	816
Building and Improvements	625
Total Investment in Real Estate	1,441
Accumulated Depreciation and Amortization	$ 344
Date of Initial Leasehold or Acquisition Investment	2,005
VIRGINIA [Member] | Accumulated Depreciation And Amortization Description [Member] | Portsmouth One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 563
Cost Capitalized Subsequent to Initial Investment	33
Land	222
Building and Improvements	374
Total Investment in Real Estate	596
Accumulated Depreciation and Amortization	$ 366
Date of Initial Leasehold or Acquisition Investment	1,990
VIRGINIA [Member] | Accumulated Depreciation And Amortization Description [Member] | Richmond One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,132
Cost Capitalized Subsequent to Initial Investment	(41)
Land	506
Building and Improvements	585
Total Investment in Real Estate	1,091
Accumulated Depreciation and Amortization	$ 322
Date of Initial Leasehold or Acquisition Investment	2,005
VIRGINIA [Member] | Accumulated Depreciation And Amortization Description [Member] | Ruther Glen One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 466
Land	31
Building and Improvements	435
Total Investment in Real Estate	466
Accumulated Depreciation and Amortization	$ 240
Date of Initial Leasehold or Acquisition Investment	2,005
VIRGINIA [Member] | Accumulated Depreciation And Amortization Description [Member] | Sandston One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 722
Land	102
Building and Improvements	620
Total Investment in Real Estate	722
Accumulated Depreciation and Amortization	$ 342
Date of Initial Leasehold or Acquisition Investment	2,005
VIRGINIA [Member] | Accumulated Depreciation And Amortization Description [Member] | Spotsylvania One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,290
Land	490
Building and Improvements	800
Total Investment in Real Estate	1,290
Accumulated Depreciation and Amortization	$ 441
Date of Initial Leasehold or Acquisition Investment	2,005
VIRGINIA [Member] | Accumulated Depreciation And Amortization Description [Member] | Springfield One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 4,257
Land	2,969
Building and Improvements	1,288
Total Investment in Real Estate	4,257
Accumulated Depreciation and Amortization	$ 386
Date of Initial Leasehold or Acquisition Investment	2,013
VIRGINIA [Member] | Accumulated Depreciation And Amortization Description [Member] | Arlington Four [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 2,062
Land	1,603
Building and Improvements	459
Total Investment in Real Estate	2,062
Accumulated Depreciation and Amortization	$ 146
Date of Initial Leasehold or Acquisition Investment	2,013
VIRGINIA [Member] | Accumulated Depreciation And Amortization Description [Member] | Ashland One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 840
Land	840
Total Investment in Real Estate	$ 840
Date of Initial Leasehold or Acquisition Investment	2,005
VIRGINIA [Member] | Accumulated Depreciation And Amortization Description [Member] | Chesapeake One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 779
Cost Capitalized Subsequent to Initial Investment	(185)
Land	398
Building and Improvements	196
Total Investment in Real Estate	594
Accumulated Depreciation and Amortization	$ 72
Date of Initial Leasehold or Acquisition Investment	1,990
VIRGINIA [Member] | Accumulated Depreciation And Amortization Description [Member] | Chesapeake Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,004
Cost Capitalized Subsequent to Initial Investment	110
Land	385
Building and Improvements	729
Total Investment in Real Estate	1,114
Accumulated Depreciation and Amortization	$ 667
Date of Initial Leasehold or Acquisition Investment	1,990
VIRGINIA [Member] | Accumulated Depreciation And Amortization Description [Member] | Fairfax One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,825
Land	1,190
Building and Improvements	635
Total Investment in Real Estate	1,825
Accumulated Depreciation and Amortization	$ 204
Date of Initial Leasehold or Acquisition Investment	2,013
VIRGINIA [Member] | Accumulated Depreciation And Amortization Description [Member] | Fairfax Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 2,078
Land	1,365
Building and Improvements	713
Total Investment in Real Estate	2,078
Accumulated Depreciation and Amortization	$ 197
Date of Initial Leasehold or Acquisition Investment	2,013
VIRGINIA [Member] | Accumulated Depreciation And Amortization Description [Member] | Fairfax Five [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 4,454
Land	3,370
Building and Improvements	1,084
Total Investment in Real Estate	4,454
Accumulated Depreciation and Amortization	$ 328
Date of Initial Leasehold or Acquisition Investment	2,013
WASHINGTON | Accumulated Depreciation And Amortization Description [Member] | Tacoma One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 518
Land	518
Total Investment in Real Estate	$ 518
Date of Initial Leasehold or Acquisition Investment	2,015
WASHINGTON | Accumulated Depreciation And Amortization Description [Member] | Tacoma Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 671
Land	671
Total Investment in Real Estate	$ 671
Date of Initial Leasehold or Acquisition Investment	2,015
WASHINGTON | Accumulated Depreciation And Amortization Description [Member] | Tenino One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 937
Land	219
Building and Improvements	718
Total Investment in Real Estate	937
Accumulated Depreciation and Amortization	$ 144
Date of Initial Leasehold or Acquisition Investment	2,015
WASHINGTON | Accumulated Depreciation And Amortization Description [Member] | Vancouver One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,214
Land	163
Building and Improvements	1,051
Total Investment in Real Estate	1,214
Accumulated Depreciation and Amortization	$ 191
Date of Initial Leasehold or Acquisition Investment	2,015
WASHINGTON | Accumulated Depreciation And Amortization Description [Member] | Auburn One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 3,022
Land	1,965
Building and Improvements	1,057
Total Investment in Real Estate	3,022
Accumulated Depreciation and Amortization	$ 224
Date of Initial Leasehold or Acquisition Investment	2,015
WASHINGTON | Accumulated Depreciation And Amortization Description [Member] | Bellevue One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,725
Land	886
Building and Improvements	839
Total Investment in Real Estate	1,725
Accumulated Depreciation and Amortization	$ 178
Date of Initial Leasehold or Acquisition Investment	2,015
WASHINGTON | Accumulated Depreciation And Amortization Description [Member] | Chehalis One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,176
Land	313
Building and Improvements	863
Total Investment in Real Estate	1,176
Accumulated Depreciation and Amortization	$ 201
Date of Initial Leasehold or Acquisition Investment	2,015
WASHINGTON | Accumulated Depreciation And Amortization Description [Member] | Colfax One Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 4,800
Land	3,611
Building and Improvements	1,189
Total Investment in Real Estate	4,800
Accumulated Depreciation and Amortization	$ 253
Date of Initial Leasehold or Acquisition Investment	2,015
WASHINGTON | Accumulated Depreciation And Amortization Description [Member] | Federal Way One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 4,218
Land	2,973
Building and Improvements	1,245
Total Investment in Real Estate	4,218
Accumulated Depreciation and Amortization	$ 284
Date of Initial Leasehold or Acquisition Investment	2,015
WASHINGTON | Accumulated Depreciation And Amortization Description [Member] | Fife One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,181
Land	414
Building and Improvements	767
Total Investment in Real Estate	1,181
Accumulated Depreciation and Amortization	$ 176
Date of Initial Leasehold or Acquisition Investment	2,015
WASHINGTON | Accumulated Depreciation And Amortization Description [Member] | Kent One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 2,900
Land	2,066
Building and Improvements	834
Total Investment in Real Estate	2,900
Accumulated Depreciation and Amortization	$ 192
Date of Initial Leasehold or Acquisition Investment	2,015
WASHINGTON | Accumulated Depreciation And Amortization Description [Member] | Monroe One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 2,792
Land	1,556
Building and Improvements	1,236
Total Investment in Real Estate	2,792
Accumulated Depreciation and Amortization	$ 268
Date of Initial Leasehold or Acquisition Investment	2,015
WASHINGTON | Accumulated Depreciation And Amortization Description [Member] | Port Orchard One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 2,019
Land	161
Building and Improvements	1,858
Total Investment in Real Estate	2,019
Accumulated Depreciation and Amortization	$ 337
Date of Initial Leasehold or Acquisition Investment	2,015
WASHINGTON | Accumulated Depreciation And Amortization Description [Member] | Puyallup One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 831
Land	172
Building and Improvements	659
Total Investment in Real Estate	831
Accumulated Depreciation and Amortization	$ 162
Date of Initial Leasehold or Acquisition Investment	2,015
WASHINGTON | Accumulated Depreciation And Amortization Description [Member] | Puyallup Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 2,035
Land	465
Building and Improvements	1,570
Total Investment in Real Estate	2,035
Accumulated Depreciation and Amortization	$ 327
Date of Initial Leasehold or Acquisition Investment	2,015
WASHINGTON | Accumulated Depreciation And Amortization Description [Member] | Puyallup Three [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 4,050
Land	2,394
Building and Improvements	1,656
Total Investment in Real Estate	4,050
Accumulated Depreciation and Amortization	$ 430
Date of Initial Leasehold or Acquisition Investment	2,015
WASHINGTON | Accumulated Depreciation And Amortization Description [Member] | Renton One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,485
Land	952
Building and Improvements	533
Total Investment in Real Estate	1,485
Accumulated Depreciation and Amortization	$ 153
Date of Initial Leasehold or Acquisition Investment	2,015
WASHINGTON | Accumulated Depreciation And Amortization Description [Member] | Seattle One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 717
Land	193
Building and Improvements	524
Total Investment in Real Estate	717
Accumulated Depreciation and Amortization	$ 107
Date of Initial Leasehold or Acquisition Investment	2,015
WASHINGTON | Accumulated Depreciation And Amortization Description [Member] | Seattle Two [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 1,884
Land	1,223
Building and Improvements	661
Total Investment in Real Estate	1,884
Accumulated Depreciation and Amortization	$ 135
Date of Initial Leasehold or Acquisition Investment	2,015
WASHINGTON | Accumulated Depreciation And Amortization Description [Member] | Silverdale One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 2,178
Land	1,217
Building and Improvements	961
Total Investment in Real Estate	2,178
Accumulated Depreciation and Amortization	$ 220
Date of Initial Leasehold or Acquisition Investment	2,015
WASHINGTON | Accumulated Depreciation And Amortization Description [Member] | Snohomish One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 955
Land	955
Total Investment in Real Estate	$ 955
Date of Initial Leasehold or Acquisition Investment	2,015
WASHINGTON | Accumulated Depreciation And Amortization Description [Member] | South Bend One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 760
Land	121
Building and Improvements	639
Total Investment in Real Estate	760
Accumulated Depreciation and Amortization	$ 127
Date of Initial Leasehold or Acquisition Investment	2,015
WASHINGTON | Accumulated Depreciation And Amortization Description [Member] | Wilbur One [Member]
Schedule Of Investments In Real Estate [Line Items]
Initial Cost of Leasehold or Acquisition Investment to Company	$ 629
Land	153
Building and Improvements	476
Total Investment in Real Estate	629
Accumulated Depreciation and Amortization	$ 106
Date of Initial Leasehold or Acquisition Investment	2,015

Schedule III - Real Estate a_21

Schedule III - Real Estate and Accumulated Depreciation and Amortization Part 20 (Parenthetical) (Detail)	12 Months Ended
	Dec. 31, 2018
Real Estate And Accumulated Depreciation Disclosure [Abstract]
Date of Initial Leasehold or Acquisition Investment	various

Schedule III - Real Estate a_22

Schedule III - Real Estate and Accumulated Depreciation and Amortization Part 21 (Parenthetical) (Detail)	12 Months Ended
	Dec. 31, 2018
Minimum [Member]
Schedule Of Investments In Real Estate [Line Items]
Estimated useful lives of the assets	16 years
Maximum [Member]
Schedule Of Investments In Real Estate [Line Items]
Estimated useful lives of the assets	25 years

Schedule III - Real Estate a_23

Schedule III - Real Estate and Accumulated Depreciation and Amortization Part 22 (Parenthetical) (Detail)	Dec. 31, 2018USD ($)
Real Estate And Accumulated Depreciation Disclosure [Abstract]
Aggregate cost for federal income tax	$ 1,046,120,000

Schedule IV - Mortgage Loans _2

Schedule IV - Mortgage Loans on Real Estate (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Mortgage Loans On Real Estate [Line Items]
Amount of Principal Unpaid at Close of Period	$ 33,519	$ 32,366	$ 32,737	$ 48,455
Borrower A [Member] | East Islip, NY [Member]
Mortgage Loans On Real Estate [Line Items]
Description	Seller financing
Interest Rate	9.00%
Final Maturity Date	2024-11
Periodic Payment Terms	P & I
Prior Liens	$ 0
Face Value at Inception	743
Amount of Principal Unpaid at Close of Period	$ 727
Borrower B [Member] | Middlesex, NJ [Member]
Mortgage Loans On Real Estate [Line Items]
Description	Seller financing
Interest Rate	9.00%
Final Maturity Date	2021-05
Periodic Payment Terms	P & I
Prior Liens	$ 0
Face Value at Inception	255
Amount of Principal Unpaid at Close of Period	$ 229
Borrower C [Member] | Valley Cottage, NY [Member]
Mortgage Loans On Real Estate [Line Items]
Description	Seller financing
Interest Rate	9.00%
Final Maturity Date	2020-10
Periodic Payment Terms	P & I
Prior Liens	$ 0
Face Value at Inception	431
Amount of Principal Unpaid at Close of Period	$ 381
Borrower D [Member] | Brooklyn, NY [Member]
Mortgage Loans On Real Estate [Line Items]
Description	Seller financing
Interest Rate	8.00%
Final Maturity Date	2019-06
Periodic Payment Terms	I
Prior Liens	$ 0
Face Value at Inception	2,000
Amount of Principal Unpaid at Close of Period	$ 2,000
Borrower E [Member] | Nyack, NY [Member]
Mortgage Loans On Real Estate [Line Items]
Description	Seller financing
Interest Rate	9.00%
Final Maturity Date	2022-09
Periodic Payment Terms	P & I
Prior Liens	$ 0
Face Value at Inception	253
Amount of Principal Unpaid at Close of Period	$ 237
Borrower F [Member] | E. Patchogue, NY [Member]
Mortgage Loans On Real Estate [Line Items]
Description	Seller financing
Interest Rate	9.00%
Final Maturity Date	2019-08
Periodic Payment Terms	P & I
Prior Liens	$ 0
Face Value at Inception	200
Amount of Principal Unpaid at Close of Period	$ 169
Borrower G [Member] | Baldwin, NY [Member]
Mortgage Loans On Real Estate [Line Items]
Description	Seller financing
Interest Rate	9.00%
Final Maturity Date	2020-09
Periodic Payment Terms	P & I
Prior Liens	$ 0
Face Value at Inception	300
Amount of Principal Unpaid at Close of Period	$ 265
Borrower H [Member] | Norwalk, CT [Member]
Mortgage Loans On Real Estate [Line Items]
Description	Seller financing
Interest Rate	9.00%
Final Maturity Date	2022-04
Periodic Payment Terms	P & I
Prior Liens	$ 0
Face Value at Inception	319
Amount of Principal Unpaid at Close of Period	$ 294
Borrower I [Member] | Stafford Springs, CT [Member]
Mortgage Loans On Real Estate [Line Items]
Description	Seller financing
Interest Rate	9.00%
Final Maturity Date	2021-01
Periodic Payment Terms	P & I
Prior Liens	$ 0
Face Value at Inception	232
Amount of Principal Unpaid at Close of Period	$ 206
Borrower J [Member] | Waterbury, CT [Member]
Mortgage Loans On Real Estate [Line Items]
Description	Seller financing
Interest Rate	9.00%
Final Maturity Date	2021-02
Periodic Payment Terms	P & I
Prior Liens	$ 0
Face Value at Inception	171
Amount of Principal Unpaid at Close of Period	$ 153
Borrower K [Member] | Great Barrington, MA [Member]
Mortgage Loans On Real Estate [Line Items]
Description	Seller financing
Interest Rate	9.00%
Final Maturity Date	2021-04
Periodic Payment Terms	P & I
Prior Liens	$ 0
Face Value at Inception	58
Amount of Principal Unpaid at Close of Period	$ 52
Borrower L [Member] | Springfield, MA [Member]
Mortgage Loans On Real Estate [Line Items]
Description	Seller financing
Interest Rate	9.00%
Final Maturity Date	2019-07
Periodic Payment Terms	P & I
Prior Liens	$ 0
Face Value at Inception	131
Amount of Principal Unpaid at Close of Period	$ 98
Borrower M [Member] | Westfield, MA [Member]
Mortgage Loans On Real Estate [Line Items]
Description	Seller financing
Interest Rate	9.00%
Final Maturity Date	2021-11
Periodic Payment Terms	P & I
Prior Liens	$ 0
Face Value at Inception	303
Amount of Principal Unpaid at Close of Period	$ 277
Borrower N [Member] | Milford, CT [Member]
Mortgage Loans On Real Estate [Line Items]
Description	Seller financing
Interest Rate	9.00%
Final Maturity Date	2025-03
Periodic Payment Terms	P & I
Prior Liens	$ 0
Face Value at Inception	398
Amount of Principal Unpaid at Close of Period	$ 392
Borrower O [Member] | Fairfield, CT [Member]
Mortgage Loans On Real Estate [Line Items]
Description	Seller financing
Interest Rate	9.00%
Final Maturity Date	2025-03
Periodic Payment Terms	P & I
Prior Liens	$ 0
Face Value at Inception	390
Amount of Principal Unpaid at Close of Period	$ 385
Borrower P [Member] | Hartford, CT [Member]
Mortgage Loans On Real Estate [Line Items]
Description	Seller financing
Interest Rate	9.00%
Final Maturity Date	2024-03
Periodic Payment Terms	P & I
Prior Liens	$ 0
Face Value at Inception	70
Amount of Principal Unpaid at Close of Period	$ 68
Borrower Q [Member] | Wilmington, DE [Member]
Mortgage Loans On Real Estate [Line Items]
Description	Seller financing
Interest Rate	9.00%
Final Maturity Date	2020-11
Periodic Payment Terms	P & I
Prior Liens	$ 0
Face Value at Inception	84
Amount of Principal Unpaid at Close of Period	$ 74
Borrower R [Member] | Clinton, MA [Member]
Mortgage Loans On Real Estate [Line Items]
Description	Seller financing
Interest Rate	9.00%
Final Maturity Date	2022-03
Periodic Payment Terms	P & I
Prior Liens	$ 0
Face Value at Inception	158
Amount of Principal Unpaid at Close of Period	$ 85
Borrower S [Member] | Fairhaven, MA [Member]
Mortgage Loans On Real Estate [Line Items]
Description	Seller financing
Interest Rate	9.00%
Final Maturity Date	2020-09
Periodic Payment Terms	P & I
Prior Liens	$ 0
Face Value at Inception	458
Amount of Principal Unpaid at Close of Period	$ 403
Borrower T [Member] | New Bedford, MA [Member]
Mortgage Loans On Real Estate [Line Items]
Description	Seller financing
Interest Rate	9.00%
Final Maturity Date	2021-10
Periodic Payment Terms	P & I
Prior Liens	$ 0
Face Value at Inception	363
Amount of Principal Unpaid at Close of Period	$ 330
Borrower U [Member] | Fitchburg, MA [Member]
Mortgage Loans On Real Estate [Line Items]
Description	Seller financing
Interest Rate	9.00%
Final Maturity Date	2021-10
Periodic Payment Terms	P & I
Prior Liens	$ 0
Face Value at Inception	187
Amount of Principal Unpaid at Close of Period	$ 170
Borrower V [Member] | Worcester, MA [Member]
Mortgage Loans On Real Estate [Line Items]
Description	Seller financing
Interest Rate	9.00%
Final Maturity Date	2021-11
Periodic Payment Terms	P & I
Prior Liens	$ 0
Face Value at Inception	237
Amount of Principal Unpaid at Close of Period	$ 216
Borrower W [Member] | S. Yarmouth, MA [Member]
Mortgage Loans On Real Estate [Line Items]
Description	Seller financing
Interest Rate	9.00%
Final Maturity Date	2022-01
Periodic Payment Terms	P & I
Prior Liens	$ 0
Face Value at Inception	275
Amount of Principal Unpaid at Close of Period	$ 252
Borrower X [Member] | Harwich Port, MA [Member]
Mortgage Loans On Real Estate [Line Items]
Description	Seller financing
Interest Rate	9.00%
Final Maturity Date	2022-01
Periodic Payment Terms	P & I
Prior Liens	$ 0
Face Value at Inception	293
Amount of Principal Unpaid at Close of Period	$ 268
Borrower Y [Member] | Southbridge, MA [Member]
Mortgage Loans On Real Estate [Line Items]
Description	Seller financing
Interest Rate	9.00%
Final Maturity Date	2021-03
Periodic Payment Terms	P & I
Prior Liens	$ 0
Face Value at Inception	300
Amount of Principal Unpaid at Close of Period	$ 268
Borrower Z [Member] | Oxford, MA [Member]
Mortgage Loans On Real Estate [Line Items]
Description	Seller financing
Interest Rate	9.00%
Final Maturity Date	2023-03
Periodic Payment Terms	P & I
Prior Liens	$ 0
Face Value at Inception	86
Amount of Principal Unpaid at Close of Period	$ 81
Borrower AA [Member] | Kernersville/Lexington, NC [Member]
Mortgage Loans On Real Estate [Line Items]
Description	Seller financing
Interest Rate	8.00%
Final Maturity Date	2026-07
Periodic Payment Terms	P & I
Prior Liens	$ 0
Face Value at Inception	568
Amount of Principal Unpaid at Close of Period	$ 150
Borrower AB [Member] | Concord, NH [Member]
Mortgage Loans On Real Estate [Line Items]
Description	Seller financing
Interest Rate	9.50%
Final Maturity Date	2028-08
Periodic Payment Terms	P & I
Prior Liens	$ 0
Face Value at Inception	210
Amount of Principal Unpaid at Close of Period	$ 148
Borrower AC [Member] | Pelham, NH [Member]
Mortgage Loans On Real Estate [Line Items]
Description	Seller financing
Interest Rate	9.00%
Final Maturity Date	2023-01
Periodic Payment Terms	P & I
Prior Liens	$ 0
Face Value at Inception	73
Amount of Principal Unpaid at Close of Period	$ 68
Borrower AD [Member] | Bayonne, NJ [Member]
Mortgage Loans On Real Estate [Line Items]
Description	Seller financing
Interest Rate	9.00%
Final Maturity Date	2020-03
Periodic Payment Terms	P & I
Prior Liens	$ 0
Face Value at Inception	308
Amount of Principal Unpaid at Close of Period	$ 266
Borrower AE [Member] | Springfield, MA [Member]
Mortgage Loans On Real Estate [Line Items]
Description	Seller financing
Interest Rate	9.00%
Final Maturity Date	2020-01
Periodic Payment Terms	P & I
Prior Liens	$ 0
Face Value at Inception	306
Amount of Principal Unpaid at Close of Period	$ 263
Borrower AF [Member] | Belleville, NJ [Member]
Mortgage Loans On Real Estate [Line Items]
Description	Seller financing
Interest Rate	9.00%
Final Maturity Date	2021-03
Periodic Payment Terms	P & I
Prior Liens	$ 0
Face Value at Inception	315
Amount of Principal Unpaid at Close of Period	$ 282
Borrower AG [Member] | Ridgefield, NJ [Member]
Mortgage Loans On Real Estate [Line Items]
Description	Seller financing
Interest Rate	9.00%
Final Maturity Date	2021-04
Periodic Payment Terms	P & I
Prior Liens	$ 0
Face Value at Inception	172
Amount of Principal Unpaid at Close of Period	$ 154
Borrower AH [Member] | Irvington, NJ.
Mortgage Loans On Real Estate [Line Items]
Description	Seller financing
Interest Rate	9.00%
Final Maturity Date	2022-07
Periodic Payment Terms	P & I
Prior Liens	$ 0
Face Value at Inception	300
Amount of Principal Unpaid at Close of Period	$ 193
Borrower AI [Member] | Jersey City, NJ [Member]
Mortgage Loans On Real Estate [Line Items]
Description	Seller financing
Interest Rate	9.50%
Final Maturity Date	2025-07
Periodic Payment Terms	P & I
Prior Liens	$ 0
Face Value at Inception	500
Amount of Principal Unpaid at Close of Period	$ 417
Borrower AJ [Member] | Colonia, NJ [Member]
Mortgage Loans On Real Estate [Line Items]
Description	Seller financing
Interest Rate	9.00%
Final Maturity Date	2020-07
Periodic Payment Terms	P & I
Prior Liens	$ 0
Face Value at Inception	320
Amount of Principal Unpaid at Close of Period	$ 280
Borrower AK [Member] | Swedesboro, NJ [Member]
Mortgage Loans On Real Estate [Line Items]
Description	Seller financing
Interest Rate	9.00%
Final Maturity Date	2021-04
Periodic Payment Terms	P & I
Prior Liens	$ 0
Face Value at Inception	77
Amount of Principal Unpaid at Close of Period	$ 69
Borrower AL [Member] | Piscataway, NJ [Member]
Mortgage Loans On Real Estate [Line Items]
Description	Seller financing
Interest Rate	9.00%
Final Maturity Date	2020-11
Periodic Payment Terms	P & I
Prior Liens	$ 0
Face Value at Inception	121
Amount of Principal Unpaid at Close of Period	$ 71
Borrower AM [Member] | Glendale, NY [Member]
Mortgage Loans On Real Estate [Line Items]
Description	Seller financing
Interest Rate	9.00%
Final Maturity Date	2025-07
Periodic Payment Terms	P & I
Prior Liens	$ 0
Face Value at Inception	525
Amount of Principal Unpaid at Close of Period	$ 502
Borrower AN [Member] | Seaford, NY [Member]
Mortgage Loans On Real Estate [Line Items]
Description	Seller financing
Interest Rate	9.00%
Final Maturity Date	2020-01
Periodic Payment Terms	P & I
Prior Liens	$ 0
Face Value at Inception	488
Amount of Principal Unpaid at Close of Period	$ 419
Borrower AO [Member] | Elmont, NY [Member]
Mortgage Loans On Real Estate [Line Items]
Description	Seller financing
Interest Rate	9.00%
Final Maturity Date	2021-10
Periodic Payment Terms	P & I
Prior Liens	$ 0
Face Value at Inception	450
Amount of Principal Unpaid at Close of Period	$ 364
Borrower AP [Member] | White Plains [Member]
Mortgage Loans On Real Estate [Line Items]
Description	Seller financing
Interest Rate	9.00%
Final Maturity Date	2021-02
Periodic Payment Terms	P & I
Prior Liens	$ 0
Face Value at Inception	444
Amount of Principal Unpaid at Close of Period	$ 396
Borrower AQ [Member] | Scarsdale, NY [Member]
Mortgage Loans On Real Estate [Line Items]
Description	Seller financing
Interest Rate	9.00%
Final Maturity Date	2025-11
Periodic Payment Terms	P & I
Prior Liens	$ 0
Face Value at Inception	337
Amount of Principal Unpaid at Close of Period	$ 300
Borrower AR [Member] | Pleasant Valley, NY [Member]
Mortgage Loans On Real Estate [Line Items]
Description	Seller financing
Interest Rate	9.00%
Final Maturity Date	2020-09
Periodic Payment Terms	P & I
Prior Liens	$ 0
Face Value at Inception	230
Amount of Principal Unpaid at Close of Period	$ 202
Borrower AS [Member] | Bronx, NY [Member]
Mortgage Loans On Real Estate [Line Items]
Description	Seller financing
Interest Rate	9.00%
Final Maturity Date	2019-12
Periodic Payment Terms	P & I
Prior Liens	$ 0
Face Value at Inception	240
Amount of Principal Unpaid at Close of Period	$ 44
Borrower AT [Member] | Freeport, NY [Member]
Mortgage Loans On Real Estate [Line Items]
Description	Seller financing
Interest Rate	9.00%
Final Maturity Date	2020-05
Periodic Payment Terms	P & I
Prior Liens	$ 0
Face Value at Inception	206
Amount of Principal Unpaid at Close of Period	$ 180
Borrower AU [Member] | Wantagh [Member]
Mortgage Loans On Real Estate [Line Items]
Description	Seller financing
Interest Rate	9.00%
Final Maturity Date	2022-05
Periodic Payment Terms	P & I
Prior Liens	$ 0
Face Value at Inception	455
Amount of Principal Unpaid at Close of Period	$ 382
Borrower AV [Member] | Colonie, NY [Member]
Mortgage Loans On Real Estate [Line Items]
Description	Seller financing
Interest Rate	9.00%
Final Maturity Date	2023-08
Periodic Payment Terms	P & I
Prior Liens	$ 0
Face Value at Inception	143
Amount of Principal Unpaid at Close of Period	$ 136
Borrower AW [Member] | Latham, NY [Member]
Mortgage Loans On Real Estate [Line Items]
Description	Seller financing
Interest Rate	9.00%
Final Maturity Date	2021-01
Periodic Payment Terms	P & I
Prior Liens	$ 0
Face Value at Inception	169
Amount of Principal Unpaid at Close of Period	$ 150
Borrower AX [Member] | Malta, NY [Member]
Mortgage Loans On Real Estate [Line Items]
Description	Seller financing
Interest Rate	9.00%
Final Maturity Date	2023-03
Periodic Payment Terms	P & I
Prior Liens	$ 0
Face Value at Inception	572
Amount of Principal Unpaid at Close of Period	$ 539
Borrower AY [Member] | Newburgh, NY [Member]
Mortgage Loans On Real Estate [Line Items]
Description	Seller financing
Interest Rate	9.00%
Final Maturity Date	2021-09
Periodic Payment Terms	P & I
Prior Liens	$ 0
Face Value at Inception	394
Amount of Principal Unpaid at Close of Period	$ 359
Borrower AZ [Member] | Coxsackie, NY [Member]
Mortgage Loans On Real Estate [Line Items]
Description	Seller financing
Interest Rate	9.00%
Final Maturity Date	2021-07
Periodic Payment Terms	P & I
Prior Liens	$ 0
Face Value at Inception	153
Amount of Principal Unpaid at Close of Period	$ 138
Borrower BA [Member] | Brewster, NY [Member]
Mortgage Loans On Real Estate [Line Items]
Description	Seller financing
Interest Rate	9.00%
Final Maturity Date	2022-10
Periodic Payment Terms	P & I
Prior Liens	$ 0
Face Value at Inception	554
Amount of Principal Unpaid at Close of Period	$ 518
Borrower BB [Member] | Cairo, NY [Member]
Mortgage Loans On Real Estate [Line Items]
Description	Seller financing
Interest Rate	9.00%
Final Maturity Date	2023-08
Periodic Payment Terms	P & I
Prior Liens	$ 0
Face Value at Inception	113
Amount of Principal Unpaid at Close of Period	$ 107
Borrower BC [Member] | Central Islip, NY [Member]
Mortgage Loans On Real Estate [Line Items]
Description	Seller financing
Interest Rate	9.00%
Final Maturity Date	2023-06
Periodic Payment Terms	P & I
Prior Liens	$ 0
Face Value at Inception	780
Amount of Principal Unpaid at Close of Period	$ 741
Borrower BD [Member] | Kenmore, NY [Member]
Mortgage Loans On Real Estate [Line Items]
Description	Seller financing
Interest Rate	9.00%
Final Maturity Date	2020-12
Periodic Payment Terms	P & I
Prior Liens	$ 0
Face Value at Inception	74
Amount of Principal Unpaid at Close of Period	$ 66
Borrower BE [Member] | Rochester, NY [Member]
Mortgage Loans On Real Estate [Line Items]
Description	Seller financing
Interest Rate	9.00%
Final Maturity Date	2025-02
Periodic Payment Terms	P & I
Prior Liens	$ 0
Face Value at Inception	174
Amount of Principal Unpaid at Close of Period	$ 171
Borrower BF [Member] | Savona, NY [Member]
Mortgage Loans On Real Estate [Line Items]
Description	Seller financing
Interest Rate	9.00%
Final Maturity Date	2025-02
Periodic Payment Terms	P & I
Prior Liens	$ 0
Face Value at Inception	157
Amount of Principal Unpaid at Close of Period	$ 154
Borrower BG [Member] | Rochester, NY [Member]
Mortgage Loans On Real Estate [Line Items]
Description	Seller financing
Interest Rate	9.00%
Final Maturity Date	2025-10
Periodic Payment Terms	P & I
Prior Liens	$ 0
Face Value at Inception	230
Amount of Principal Unpaid at Close of Period	$ 229
Borrower BH [Member] | Greigsville, NY [Member]
Mortgage Loans On Real Estate [Line Items]
Description	Seller financing
Interest Rate	9.00%
Final Maturity Date	2025-11
Periodic Payment Terms	P & I
Prior Liens	$ 0
Face Value at Inception	200
Amount of Principal Unpaid at Close of Period	$ 200
Borrower BI [Member] | Horsham, PA [Member]
Mortgage Loans On Real Estate [Line Items]
Description	Seller financing
Interest Rate	10.00%
Final Maturity Date	2024-07
Periodic Payment Terms	P & I
Prior Liens	$ 0
Face Value at Inception	237
Amount of Principal Unpaid at Close of Period	$ 117
Borrower BJ [Member] | Warwick, RI [Member]
Mortgage Loans On Real Estate [Line Items]
Description	Seller financing
Interest Rate	9.00%
Final Maturity Date	2022-08
Periodic Payment Terms	P & I
Prior Liens	$ 0
Face Value at Inception	333
Amount of Principal Unpaid at Close of Period	$ 309
Borrower BK [Member] | Providence, RI [Member]
Mortgage Loans On Real Estate [Line Items]
Description	Seller financing
Interest Rate	9.00%
Final Maturity Date	2021-09
Periodic Payment Terms	P & I
Prior Liens	$ 0
Face Value at Inception	184
Amount of Principal Unpaid at Close of Period	$ 167
Borrower BL [Member] | Warwick, RI [Member]
Mortgage Loans On Real Estate [Line Items]
Description	Seller financing
Interest Rate	9.00%
Final Maturity Date	2021-10
Periodic Payment Terms	P & I
Prior Liens	$ 0
Face Value at Inception	357
Amount of Principal Unpaid at Close of Period	$ 325
Borrower BM [Member] | Cranston, RI [Member]
Mortgage Loans On Real Estate [Line Items]
Description	Seller financing
Interest Rate	9.00%
Final Maturity Date	2022-08
Periodic Payment Terms	P & I
Prior Liens	$ 0
Face Value at Inception	153
Amount of Principal Unpaid at Close of Period	$ 142
Borrower BN [Member] | E. Providence, RI [Member]
Mortgage Loans On Real Estate [Line Items]
Description	Seller financing
Interest Rate	9.00%
Final Maturity Date	2022-02
Periodic Payment Terms	P & I
Prior Liens	$ 0
Face Value at Inception	186
Amount of Principal Unpaid at Close of Period	$ 171
Borrower BO [Member] | York, PA [Member]
Mortgage Loans On Real Estate [Line Items]
Description	Seller financing
Interest Rate	9.00%
Final Maturity Date	2021-02
Periodic Payment Terms	P & I
Prior Liens	$ 0
Face Value at Inception	102
Amount of Principal Unpaid at Close of Period	$ 91
Borrower BP [Member] | Ephrata, PA [Member]
Mortgage Loans On Real Estate [Line Items]
Description	Seller financing
Interest Rate	9.00%
Final Maturity Date	2020-10
Periodic Payment Terms	P & I
Prior Liens	$ 0
Face Value at Inception	265
Amount of Principal Unpaid at Close of Period	$ 158
Borrower BQ [Member] | McConnellsburg, PA [Member]
Mortgage Loans On Real Estate [Line Items]
Description	Seller financing
Interest Rate	9.00%
Final Maturity Date	2023-01
Periodic Payment Terms	P & I
Prior Liens	$ 0
Face Value at Inception	38
Amount of Principal Unpaid at Close of Period	36
Note Receivable On Mortgage Loans
Mortgage Loans On Real Estate [Line Items]
Prior Liens	0
Face Value at Inception	39,308
Amount of Principal Unpaid at Close of Period	$ 33,519
Note Receivable On Mortgage Loans | Various-NY [Member]
Mortgage Loans On Real Estate [Line Items]
Description	Purchase/leaseback
Interest Rate	9.50%
Final Maturity Date	2021-01
Periodic Payment Terms	I
Prior Liens	$ 0
Face Value at Inception	18,400
Amount of Principal Unpaid at Close of Period	$ 14,720
Note Receivable On Mortgage Loans | Various-CT [Member]
Mortgage Loans On Real Estate [Line Items]
Description	Promissory Note
Interest Rate	9.00%
Final Maturity Date	2028-12
Prior Liens	$ 0
Amount of Principal Unpaid at Close of Period	545
Mortgage Loans [Member]
Mortgage Loans On Real Estate [Line Items]
Prior Liens	0
Face Value at Inception	20,908
Amount of Principal Unpaid at Close of Period	$ 18,254

Schedule IV - Changes in Carryi

Schedule IV - Changes in Carrying Amount of Mortgage Loans (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Mortgage Loans On Real Estate [Abstract]
Beginning balance	$ 32,366	$ 32,737	$ 48,455
New mortgage loans	4,287	1,505	1,814
Loan repayments	(2,368)	(1,227)	(16,714)
Collection of principal	(766)	(649)	(818)
Ending balance	$ 33,519	$ 32,366	$ 32,737