Gladstone Commercial (GOOD) 10-Q 29 Oct 14 2014 Q3 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	9 Months Ended
	Sep. 30, 2014	Oct. 29, 2014
Document And Entity Information [Abstract]	'	'
Document Type	'10-Q	'
Amendment Flag	'false	'
Document Period End Date	30-Sep-14	'
Document Fiscal Year Focus	'2014	'
Document Fiscal Period Focus	'Q3	'
Trading Symbol	'GOOD	'
Entity Registrant Name	'GLADSTONE COMMERCIAL CORP	'
Entity Central Index Key	'0001234006	'
Current Fiscal Year End Date	'--12-31	'
Entity Filer Category	'Accelerated Filer	'
Entity Common Stock, Shares Outstanding	'	18,928,422

Condensed_Consolidated_Balance

Condensed Consolidated Balance Sheets (USD $)	Sep. 30, 2014		Dec. 31, 2013
In Thousands, unless otherwise specified
ASSETS	'		'
Real estate, at cost	$700,574		$642,353
Less: accumulated depreciation	93,401		81,241
Total real estate, net	607,173		561,112
Lease intangibles, net	94,642		79,632
Mortgage note receivable	5,600		'
Cash and cash equivalents	5,237		8,546
Restricted cash	3,541		5,051
Funds held in escrow	13,377		8,653
Deferred rent receivable, net	21,387		18,905
Deferred financing costs, net	6,342		6,840
Other assets	2,108		1,786
TOTAL ASSETS	759,407		690,525
LIABILITIES	'		'
Series C mandatorily redeemable preferred stock, par value $0.001 per share; $25 per share liquidation preference; 1,700,000 shares authorized; and 1,540,000 shares issued and outstanding at September 30, 2014 and December 31, 2013, respectively	2		2
Mortgage notes payable	460,358		422,602
Borrowings under line of credit	45,600		24,400
Deferred rent liability, net	5,861		6,015
Asset retirement obligation	3,950		3,884
Accounts payable and accrued expenses	7,267		2,359
Due to Adviser and Administrator	1,688	[1]	1,360	[1]
Other liabilities	6,987		8,259
Total Liabilities	570,211		507,379
Commitments and contingencies	'	[2]	'	[2]
STOCKHOLDERS' EQUITY	'		'
Series A and B redeemable preferred stock, par value $0.001 per share; $25 per share liquidation preference; 2,300,000 shares authorized and 2,150,000 shares issued and outstanding at September 30, 2014 and December 31, 2013, respectively	2		2
Senior common stock, par value $0.001 per share; 7,500,000 shares authorized and 659,537 and 374,484 shares issued and outstanding at September 30, 2014 and December 31, 2013, respectively	1		'
Common stock, par value $0.001 per share, 38,500,000 shares authorized and 17,907,652 and 15,662,414 shares issued and outstanding at September 30, 2014 and December 31, 2013, respectively	18		16
Additional paid in capital	339,083		298,751
Notes receivable-employee	-375		-375
Distributions in excess of accumulated earnings	-149,533		-115,248
Total Stockholders' Equity	189,196		183,146
TOTAL LIABILITIES AND STOCKHOLDERS' EQUITY	759,407		690,525
Mandatorily Redeemable Preferred Stock [Member]	'		'
LIABILITIES	'		'
Series C mandatorily redeemable preferred stock, par value $0.001 per share; $25 per share liquidation preference; 1,700,000 shares authorized; and 1,540,000 shares issued and outstanding at September 30, 2014 and December 31, 2013, respectively	38,500		38,500
STOCKHOLDERS' EQUITY	'		'
Series A and B redeemable preferred stock, par value $0.001 per share; $25 per share liquidation preference; 2,300,000 shares authorized and 2,150,000 shares issued and outstanding at September 30, 2014 and December 31, 2013, respectively	$38,500		$38,500
[1]	Refer to Note 2 "Related-Party Transactions"
[2]	Refer to Note 9 "Commitments and Contingencies"

Condensed_Consolidated_Balance1

Condensed Consolidated Balance Sheets (Parenthetical) (USD $)	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2014	Dec. 31, 2013
			Series C Preferred Stock [Member]	Series C Preferred Stock [Member]
			Mandatorily Redeemable Preferred Stock [Member]	Mandatorily Redeemable Preferred Stock [Member]
Redeemable preferred stock, par value	$0.00	$0.00	$0.00	$0.00
Redeemable preferred stock, liquidation preference	$25	$25	$25	$25
Redeemable preferred stock, shares authorized	2,300,000	2,300,000	1,700,000	1,700,000
Redeemable preferred stock, shares issued	2,150,000	2,150,000	1,540,000	1,540,000
Redeemable preferred stock, shares outstanding	2,150,000	2,150,000	1,540,000	1,540,000
Senior common stock, par value	$0.00	$0.00	'	'
Senior common stock, shares authorized	7,500,000	7,500,000	'	'
Senior common stock, shares issued	659,537	374,484	'	'
Senior common stock, shares outstanding	659,537	374,484	'	'
Common stock, par value	$0.00	$0.00	'	'
Common stock, shares authorized	38,500,000	38,500,000	'	'
Common stock, shares issued	17,907,652	15,662,414	'	'
Common stock, shares outstanding	17,907,652	15,662,414	'	'

Condensed_Consolidated_Stateme

Condensed Consolidated Statements of Operations (USD $)	3 Months Ended				9 Months Ended
In Thousands, except Share data, unless otherwise specified	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013
Operating revenues	'		'		'		'
Rental revenue	$18,368		$15,807		$52,573		$43,663
Interest income from mortgage note receivable	97		'		97		'
Tenant recovery revenue	549		383		1,870		819
Income from real estate and related assets held for sale	19,014		16,190		54,540		44,482
Operating expenses	'		'		'		'
Depreciation and amortization	7,516		6,253		21,107		16,374
Property operating expenses	1,202		864		3,834		2,164
Acquisition related expenses	233		163		1,202		622
Base management fee	741	[1]	559	[1]	2,031	[1]	1,363	[1]
Incentive fee	1,538	[1]	1,138	[1]	4,305	[1]	3,001	[1]
Administration fee	260	[1]	274	[1]	1,238	[1]	1,004	[1]
General and administrative	538		377		1,495		1,243
Impairment charge	280		'		14,238		'
Total operating expenses before credit to incentive fee	12,308		9,628		49,450		25,771
Credit to incentive fee	-851	[1]	-989	[1]	-3,013	[1]	-2,491	[1]
Total operating expenses	11,457		8,639		46,437		23,280
Other income (expense)	'		'		'		'
Interest expense	-6,679		-6,573		-19,463		-17,998
Gain on sale of real estate	'		'		1,240		'
Other income	37		17		111		47
Total other expense	-7,328		-7,242		-20,169		-20,008
Net income (loss)	229		309		-12,066		1,194
Distributions attributable to senior common stock	-137		-83		-347		-204
Net loss attributable to common stockholders	-931		-797		-15,483		-2,080
Loss per weighted average share of common stock-basic & diluted	'		'		'		'
Loss from continuing operations (net of dividends attributable to preferred stock)	($0.05)		($0.06)		($0.93)		($0.16)
Loss attributable to common stockholders	($0.05)		($0.06)		($0.93)		($0.16)
Weighted average shares of common stock outstanding	'		'		'		'
Basic	17,739,084		14,196,423		16,685,162		12,613,354
Diluted	17,739,084		14,196,423		16,685,162		12,613,354
Earnings per weighted average share of senior common stock	$0.26		$0.26		$0.79		$0.78
Weighted average shares of senior common stock outstanding-basic	518,592		313,239		438,196		260,693
Series C Preferred Stock [Member]	'		'		'		'
Other income (expense)	'		'		'		'
Distributions attributable to Series C mandatorily redeemable preferred stock	-686		-686		-2,057		-2,057
Series A and B Preferred Stock [Member]	'		'		'		'
Other income (expense)	'		'		'		'
Distributions attributable to Series A and B preferred stock	($1,023)		($1,023)		($3,070)		($3,070)
[1]	Refer to Note 2 "Related-Party Transactions"

Condensed_Consolidated_Stateme1

Condensed Consolidated Statements of Cash Flows (USD $)	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Cash flows from operating activities:	'	'
Net (loss) income	($12,066,000)	$1,194,000
Adjustments to reconcile net (loss) income to net cash provided by operating activities:	'	'
Depreciation and amortization	21,107,000	16,374,000
Impairment charge	14,238,000	'
Gain on sale of real estate	-1,240,000	'
Amortization of deferred financing costs	1,209,000	1,410,000
Amortization of deferred rent asset and liability, net	-266,000	-243,000
Amortization of discount and premium on assumed debt	-190,000	-128,000
Asset retirement obligation expense	-96,000	96,000
(Decrease) increase in other assets	-322,000	242,000
Increase in deferred rent liability	311,000	'
Increase in deferred rent receivable	-2,808,000	-2,724,000
Decrease in accounts payable, accrued expenses, and amount due Adviser and Administrator	-538,000	-1,339,000
Decrease in other liabilities	238,000	1,698,000
Leasing commissions paid	-898,000	-1,008,000
Net cash provided by operating activities	18,679,000	15,572,000
Cash flows from investing activities:	'	'
Acquisition of real estate and related intangible assets	-83,564,000	-104,806,000
Improvements of existing real estate	-5,416,000	-5,355,000
Proceeds from sale of real estate	11,162,000	'
Issuance of mortgage note receivable	-5,600,000	'
Receipts from lenders for funds held in escrow	1,670,000	5,764,000
Payments to lenders for funds held in escrow	-6,394,000	-7,159,000
Receipts from tenants for reserves	2,484,000	5,657,000
Payments to tenants from reserves	-3,892,000	-2,167,000
Decrease (increase) in restricted cash	1,510,000	-3,472,000
Deposits on future acquisitions	-2,000,000	-2,125,000
Deposits applied against real estate investments	2,000,000	2,675,000
Net cash used in investing activities	-88,040,000	-110,988,000
Cash flows from financing activities:	'	'
Proceeds from issuance of equity	42,636,000	62,139,000
Offering costs	-2,443,000	-3,533,000
Borrowings under mortgage notes payable	33,635,000	56,108,000
Payments for deferred financing costs	-711,000	-1,484,000
Principal repayments on mortgage notes payable	-6,085,000	-5,403,000
Principal repayments on employee notes receivable	'	35,000
Borrowings from line of credit	67,250,000	58,900,000
Repayments on line of credit	-46,050,000	-55,000,000
Decrease in security deposits	-103,000	-18,000
Distributions paid for common, senior common and preferred stock	-22,077,000	-17,343,000
Net cash provided by financing activities	66,052,000	94,401,000
Net decrease in cash and cash equivalents	-3,309,000	-1,015,000
Cash and cash equivalents, beginning of period	8,546,000	5,546,000
Cash and cash equivalents, end of period	5,237,000	4,531,000
NON-CASH INVESTING AND FINANCING INFORMATION	'	'
Increase in asset retirement obligation	162,000	'
Fixed rate principal debt assumed in connection with acquisitions	10,147,000	'
Senior common dividend issued in the dividend reinvestment program	142,000	85,000
Capital improvements included in accounts payable and accrued expenses	$5,774,000	'

Organization_Basis_of_Presenta

Organization, Basis of Presentation and Significant Accounting Policies	9 Months Ended
	Sep. 30, 2014
Accounting Policies [Abstract]	'
Organization, Basis of Presentation and Significant Accounting Policies	'
	1. Organization, Basis of Presentation and Significant Accounting Policies
	Gladstone Commercial Corporation is a real estate investment trust, or REIT, that was incorporated under the General Corporation Laws of the State of Maryland on February 14, 2003 primarily for the purpose of investing in and owning net leased industrial, commercial and retail real property and selectively making long-term industrial and commercial mortgage loans. Subject to certain restrictions and limitations, our business is managed by Gladstone Management Corporation, a Delaware corporation, or the Adviser, and administrative services are provided by Gladstone Administration, LLC, a Delaware limited liability company, or the Administrator, each pursuant to a contractual arrangement with us. Our Adviser and Administrator collectively employ all of our personnel and pay their salaries, benefits, and general expenses directly.
	All further references herein to “we,” “our,” “us” and the “Company” mean Gladstone Commercial Corporation and its consolidated subsidiaries, except where it is made clear that the term means only Gladstone Commercial Corporation.
	Subsidiaries
	We conduct substantially all of our operations through a subsidiary, Gladstone Commercial Limited Partnership, a Delaware limited partnership, or the Operating Partnership. As we currently own all of the general and limited partnership interests of the Operating Partnership through two of our subsidiaries, GCLP Business Trust I and II, the financial position and results of operations of the Operating Partnership are consolidated with those of the Company.
	Gladstone Commercial Lending, LLC, a Delaware limited liability company, or Gladstone Commercial Lending, a subsidiary of ours, was created to conduct all operations related to real estate mortgage loans of the Company. As the Operating Partnership currently owns all of the membership interests of Gladstone Commercial Lending, the financial position and results of operations of Gladstone Commercial Lending are consolidated with ours.
	Gladstone Commercial Advisers, Inc., a Delaware corporation, or Commercial Advisers, and a wholly-owned subsidiary of ours, is a taxable REIT subsidiary, or TRS, which was created to collect any non-qualifying income related to our real estate portfolio. There has been no such income earned to date. Since we own 100% of the voting securities of Commercial Advisers, the financial position and results of operations of Commercial Advisers are consolidated with ours.
	GCLP Business Trust I and GCLP Business Trust II, each a subsidiary and business trust of ours, were formed under the laws of the Commonwealth of Massachusetts on December 28, 2005. We transferred our 99% limited partnership interest in the Operating Partnership to GCLP Business Trust I in exchange for 100 shares of the trust. Gladstone Commercial Partners, LLC transferred its 1% general partnership interest in the Operating Partnership to GCLP Business Trust II in exchange for 100 trust shares.
	Interim Financial Information
	Our interim financial statements are prepared in accordance with U.S. generally accepted accounting principles, or GAAP, for interim financial information and pursuant to the requirements for reporting on Form 10-Q and in accordance with Article 10 of Regulation S-X. Accordingly, certain disclosures accompanying annual financial statements prepared in accordance with GAAP are omitted. The year-end balance sheet data presented herein was derived from audited financial statements, but does not include all disclosures required by GAAP. In the opinion of our management, all adjustments, consisting solely of normal recurring accruals, necessary for the fair presentation of financial statements for the interim period, have been included. The interim financial statements and notes thereto should be read in conjunction with the financial statements and notes thereto included in our Form 10-K for the year ended December 31, 2013, as filed with the U.S. Securities and Exchange Commission on February 18, 2014. The results of operations for the three and nine months ended September 30, 2014 are not necessarily indicative of the results that may be expected for other interim periods or for the full fiscal year.
	Out-of-Period Adjustment
	During the three months ended September 30, 2014, we recorded an adjustment to our impairment charge and to deferred rent receivable that were related to the impairment of our Roseville, Minnesota property in March 2014. As a result of the correction of these errors, we understated net income by $0.3 million for the three months ended September 30, 2014, there was no impact to the net income for the nine months ended September 30, 2014. We concluded that these adjustments were not material to the results of operations for any interim period presented.
	Use of Estimates
	The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting periods. Actual results could materially differ from those estimates.
	Real Estate and Lease Intangibles
	We record investments in real estate at cost and capitalize improvements and replacements when they extend the useful life or improve the efficiency of the asset. We expense costs of repairs and maintenance as such costs are incurred. We compute depreciation using the straight-line method over the estimated useful life, or 39 years, for buildings and improvements, 5 to 20 years for equipment and fixtures, and the shorter of the useful life or the remaining lease term for tenant improvements and leasehold interests.
	Certain of our acquisitions involve sale-leaseback transactions with newly-originated leases, which we account for as asset acquisitions under Accounting Standards Codification, or ASC, 805, “Business Combinations.” In the case of an asset acquisition, we will capitalize the transaction costs incurred in connection with the acquisition. Other of our acquisitions involve the acquisition of properties that are already being operated as rental properties, which we will generally consider to be a business combination under ASC 805. Business combination guidance is generally applicable to us when properties are acquired with leases in place at the time of acquisition. When an acquisition is considered a business combination, ASC 805 requires that the purchase price of real estate be allocated to the acquired tangible assets and liabilities, consisting of land, building, tenant improvements, long-term debt assumed and identified intangible assets and liabilities, typically the value of above-market and below-market leases, the value of in-place leases, the value of unamortized lease origination costs and the value of tenant relationships, based in each case on their fair values. ASC 805 also requires that all expenses related to an acquisition accounted for as a business combination to be expensed as incurred, rather than capitalized into the cost of the acquisition.
	Management’s estimates of fair value are made using methods similar to those used by independent appraisers (e.g. discounted cash flow analysis). Factors considered by management in its analysis include an estimate of carrying costs during hypothetical expected lease-up periods considering current market conditions and costs to execute similar leases. We also consider information obtained about each property as a result of our pre-acquisition due diligence, marketing and leasing activities in estimating the fair value of the tangible and intangible assets acquired and liabilities assumed. In estimating carrying costs, management also includes lost reimbursement of real estate taxes, insurance and other operating expenses as well as estimates of lost rentals at market rates during the hypothetical expected lease-up periods, which primarily range from 9 to 18 months, depending on specific local market conditions. Management also estimates costs to execute similar leases, including leasing commissions, legal and other related expenses to the extent that such costs are not already incurred in connection with a new lease origination as part of the transaction.
	We allocate purchase price to the fair value of the tangible assets of an acquired property by valuing the property as if it were vacant. The “as-if-vacant” value is allocated to land, building and tenant improvements based on management’s determination of the relative fair values of these assets. Real estate depreciation expense on these tangible assets was $4.8 million and $13.8 million for the three and nine months ended September 30, 2014, respectively, and $4.2 million and $11.2 million for the three and nine months ended September 30, 2013, respectively.
	Above-market and below-market in-place lease fair values for owned properties are recorded based on the present value (using an interest rate which reflects the risks associated with the leases acquired) of the difference between (i) the contractual amounts to be paid pursuant to the in-place leases and (ii) management’s estimate of fair market lease rates for the corresponding in-place leases, measured over a period equal to the remaining non-cancelable term of the lease. When determining the non-cancelable term of the lease, we evaluate if fixed-rate renewal options, if any, should be included. The capitalized above-market lease values, included in the accompanying condensed consolidated balance sheets as part of deferred rent receivable, are amortized as a reduction of rental income over the remaining non-cancelable terms of the respective leases. Total amortization related to above-market lease values was $0.1 million and $0.2 million for both the three and nine months ended September 30, 2014 and 2013, respectively. The capitalized below-market lease values, included in the accompanying condensed consolidated balance sheets as part of deferred rent liability, are amortized as an increase to rental income over the remaining non-cancelable terms of the respective leases, including any below market renewal periods. Total amortization related to below-market lease values was $0.2 million and $0.5 million for the three and nine months ended September 30, 2014, respectively, and $0.2 million and $0.4 million for the three and nine months ended September 30, 2013, respectively.
	The total amount of the remaining intangible assets acquired, which consists of in-place lease values, unamortized lease origination costs, and customer relationship intangible values, are allocated based on management’s evaluation of the specific characteristics of each tenant’s lease and our overall relationship with that respective tenant. Characteristics to be considered by management in determining these values include the nature and extent of our existing business relationships with the tenant, growth prospects for developing new business with the tenant, the tenant’s credit quality and our expectations of lease renewals (including those existing under the terms of the lease agreement), among other factors.
	The value of in-place leases and lease origination costs are amortized to expense over the remaining term of the respective leases, which generally range from 10 to 15 years. The value of customer relationship intangibles, which is the benefit to us resulting from the likelihood of an existing tenant renewing its lease, are amortized to expense over the remaining term and any anticipated renewal periods in the respective leases, but in no event does the amortization period for intangible assets exceed the remaining depreciable life of the building. Should a tenant terminate its lease, the unamortized portion of the above-market and below-market lease values would be charged to rental income and the unamortized portion of in-place lease values, lease origination costs and customer relationship intangibles will be immediately charged to amortization expense. Total amortization expense related to these intangible assets and liabilities was $2.6 million and $7.2 million for the three and nine months ended September 30, 2014, respectively, and $2.0 million and $5.2 million for the three and nine months ended September 30, 2013, respectively.
	Impairment Charges
	We account for the impairment of real estate, including intangible assets, in accordance with ASC 360-10-35, “Property, Plant, and Equipment,” which requires us to periodically review the carrying value of each property to determine if circumstances indicate impairment of the carrying value of the investment exists or that depreciation periods should be modified. If circumstances indicate the possibility of impairment, we prepare a projection of the undiscounted future cash flows, without interest charges, of the specific property and determine if the carrying value of the investment in such property is recoverable. In performing the analysis, we consider such factors as each tenant’s payment history and financial condition, the likelihood of lease renewal, business conditions in the industry in which the tenants operate, whether there are indications that the fair value of the real estate has decreased and our intended holding period of the property. If the carrying amount is more than the aggregate undiscounted future cash flows, we would recognize an impairment loss to the extent the carrying amount exceeds the estimated fair value, less cost to sell, of the property. We evaluate our entire portfolio of properties each quarter for any impairment indicators and perform an impairment analysis on those select properties that have an indication of impairment.
	Deferred Financing Costs
	Deferred financing costs consist of costs incurred to obtain financing, including legal fees, origination fees and administrative fees. The costs are deferred and amortized using the straight-line method, which approximates the effective interest method, over the term of the secured financing. We made payments of $0.1 million and $0.7 million for deferred financing costs during the three and nine months ended September 30, 2014, respectively, and payments of $1.3 million and $1.5 million during the three and nine months ended September 30, 2013, respectively. Total amortization expense related to deferred financing costs is included in interest expense and was $0.4 million and $1.2 million for the three and nine months ended September 30, 2014, respectively, and $0.6 million and $1.4 million for the three and nine months ended September 30, 2013, respectively.
	Revenue Recognition
	Rental revenue includes rents that each tenant pays in accordance with the terms of its respective lease reported evenly over the non-cancelable term of the lease. Most of our leases contain rental increases at specified intervals. We recognize such revenues on a straight-line basis. Deferred rent receivable in the accompanying condensed consolidated balance sheet includes the cumulative difference between rental revenue, as recorded on a straight-line basis, and rents received from the tenants in accordance with the lease terms, along with the capitalized above-market in-place lease values of certain acquired properties. Accordingly, we determine, in our judgment, to what extent the deferred rent receivable applicable to each specific tenant is collectable. We review deferred rent receivable, as it relates to straight line rents, on a quarterly basis and take into consideration the tenant’s payment history, the financial condition of the tenant, business conditions in the industry in which the tenant operates and economic conditions in the geographic area in which the property is located. In the event that the collectability of deferred rent with respect to any given tenant is in doubt, we record an allowance for uncollectable accounts or record a direct write-off of the specific rent receivable. No such reserves or direct write-offs have been recorded to date.
	Management considers its loans and other lending investments to be held-for-investment. We reflect our loans classified as long-term investments at amortized cost, less allowance for loan losses, acquisition premiums or discounts, and deferred loan fees. On occasion, we may acquire loans at small premiums or discounts based on the credit characteristics of such loans. These premiums or discounts would be recognized as yield adjustments over the lives of the related loans. Loan origination fees, as well as direct loan origination costs, are also deferred and recognized over the lives of the related loans as yield adjustments. If loans with premiums, discounts, or loan origination fees are prepaid, we would immediately recognize the unamortized portion as a decrease or increase in the prepayment gain or loss. Interest income is recognized using the effective interest method applied on a loan-by-loan basis. Prepayment penalties or yield maintenance payments from borrowers are recognized as additional income when received.
	Tenant recovery revenue includes payments from tenants as reimbursements for franchise taxes, management fees, insurance, and ground lease payments. We recognize tenant recovery revenue in the same periods that we incur the related expenses.
	Asset Retirement Obligations
	ASC 410, “Asset Retirement and Environmental Obligation,” requires an entity to recognize a liability for a conditional asset retirement obligation when incurred if the liability can be reasonably estimated. ASC 410-20-20 clarifies that the term “Conditional Asset Retirement Obligation” refers to a legal obligation (pursuant to existing laws or by contract) to perform an asset retirement activity in which the timing and/or method of settlement are conditional on a future event that may or may not be within the control of the entity. ASC 410-20-25-6 clarifies when an entity would have sufficient information to reasonably estimate the fair value of an asset retirement obligation. We have accrued a liability and corresponding increase to the cost of the related properties for disposal related to all properties constructed prior to 1985 that have, or may have, asbestos present in the building. The liabilities are accreted over the life of the leases for the respective properties. We accrued $0.2 million in liabilities in connection with acquisitions during the nine months ended September 30, 2014. There were no liabilities accrued during the nine months ended September 30, 2013. We recorded expenses of $0.04 million and $0.1 million during the three and nine months ended September 30, 2014, respectively, and $0.03 million and $0.1 million during the three and nine months ended September 30, 2013, respectively, to general and administrative expense. Costs of future expenditures for obligations are discounted to their present value. The aggregate undiscounted obligation on all properties is $9.5 million and the discount rates used in the calculations range from 2.5% to 7.6%. We do not expect to make any payments in conjunction with these obligations in each of the next five years.
	Comprehensive Income (Loss)
	For the three and nine months ended September 30, 2014 and 2013, comprehensive income (loss) equaled net income (loss); therefore, a separate statement of comprehensive income (loss) is not included in the accompanying condensed consolidated financial statements.
	Recently Issued Accounting Guidance
	The Financial Accounting Standards Board, or FASB, issued Accounting Standards Update No. 2014-08, “Presentation of Financial Statements (Topic 205) and Property, Plant, and Equipment (Topic 360): Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity.” Under this revised guidance, only disposals representing a strategic shift in operations, such as a disposal of a major geographic area, a major line of business or a major equity method investment, will be presented as discontinued operations. This standard is effective for our fiscal year beginning January 1, 2015; however, the FASB has permitted early adoption beginning with the first quarter of 2014. We adopted this standard as of March 31, 2014. We anticipate the adoption will result in most disposals not qualifying for discontinued operations presentation.
	In May 2014, the FASB issued a new accounting standard, or ASC, “Revenue from Contracts with Customers (ASC 606).” The revenue standard contains principles that an entity will apply to determine the measurement of revenue and timing of when it is recognized. This standard is effective for our fiscal year beginning January 1, 2017 and we are currently evaluating any impact from adoption.

RelatedParty_Transactions

Related-Party Transactions	9 Months Ended
	Sep. 30, 2014
Related Party Transactions [Abstract]	'
Related-Party Transactions	'
	2. Related-Party Transactions
	Gladstone Management and Gladstone Administration
	We are externally managed pursuant to contractual arrangements with our Adviser and our Administrator which collectively employ all of our personnel and pay their salaries, benefits, and general expenses directly. Both our Adviser and Administrator are affiliates of ours as their parent company is controlled by Mr. David Gladstone, our chairman and chief executive officer. We have an advisory agreement with our Adviser, or the Advisory Agreement, and an administration agreement with our Administrator, or the Administration Agreement. The management and administrative services and fees under the Advisory and Administration Agreements are described below. At September 30, 2014 and December 31, 2013, $1.7 million and $1.4 million, respectively, was collectively due to our Adviser and Administrator.
	Advisory Agreement
	The Advisory Agreement provides for an annual base management fee equal to 2% of our total stockholders’ equity, less the recorded value of any preferred stock and adjusted to exclude the effect of any unrealized gains, losses or other items that do not affect realized net income (including impairment charges), or common stockholders’ equity, and an incentive fee based on funds from operations, or FFO. For the three and nine months ended September 30, 2014, we recorded a base management fee of $0.7 million and $2.0 million, respectively, and for the three and nine months ended September 30, 2013, we recorded a base management fee of $0.6 million and $1.4 million, respectively.
	For purposes of calculating the incentive fee, FFO includes any realized capital gains and capital losses, less any distributions paid on preferred stock and senior common stock, but FFO does not include any unrealized capital gains or losses (including impairment charges). The incentive fee rewards the Adviser if our quarterly FFO, before giving effect to any incentive fee, or pre-incentive fee FFO, exceeds 1.75%, or 7% annualized, or the hurdle rate, of total common stockholders’ equity. The Adviser receives 100% of the amount of the pre-incentive fee FFO that exceeds the hurdle rate, but is less than 2.1875% of our common stockholders’ equity. The Adviser also receives an incentive fee of 20% of the amount of our pre-incentive fee FFO that exceeds 2.1875% of common stockholders’ equity.
	For the three and nine months ended September 30, 2014, we recorded an incentive fee of $1.5 million and $4.3 million, respectively, offset by credits related to unconditional, voluntary and irrevocable waivers issued by the Adviser of $0.8 million and $3.0 million, respectively, resulting in a net incentive fee for the three and nine months ended September 30, 2014, of $0.7 million and $1.3 million, respectively. For the three and nine months ended September 30, 2013, we recorded an incentive fee of $1.1 million and $3.0 million, respectively, offset by credits related to unconditional, voluntary and irrevocable waivers issued by the Adviser of $1.0 million and $2.5 million, respectively, resulting in a net incentive fee for the three and nine months ended September 30, 2013, of $0.1 million and $0.5 million, respectively. Our Board of Directors accepted the Adviser’s offer to waive, on a quarterly basis, a portion of the incentive fee for the three and nine months ended September 30, 2014 and 2013, to support the current level of distributions to all classes of our stockholders. This waiver may not be recouped by the Adviser in the future.
	Administration Agreement
	Pursuant to the Administration Agreement, we pay for our allocable portion of the Administrator’s expenses in performing services to us, including, but not limited to, rent and the salaries and benefits of its personnel, including our chief financial officer and treasurer, chief compliance officer, general counsel and secretary (who also serves as our Administrator’s president), and their respective staffs. Prior to July 1, 2014, our allocable portion was derived by multiplying that portion of the Administrator’s expenses allocable to all funds managed by the Adviser by the percentage of our total assets at the beginning of each quarter in comparison to the total assets of all funds managed by the Adviser. As approved by our Board of Directors, effective July 1, 2014, our allocable portion of the Administrator’s expenses will be derived by multiplying our Administrator’s total expenses by the approximate percentage of time the Administrator’s employees perform services for us in relation to their time spent performing services for all companies serviced by our Administrator under contractual agreements. For the three and nine months ended September 30, 2014, we recorded an administration fee of $0.3 million and $1.2 million, respectively, and for the three and nine months ended September 30, 2013, we recorded an administration fee of $0.3 million and $1.0 million, respectively.
	Gladstone Securities
	Gladstone Securities, LLC, or Gladstone Securities, is a privately held broker dealer registered with The Financial Industry Regulatory Authority and insured by the Securities Investor Protection Corporation. Gladstone Securities is an affiliate of ours, as its parent company is controlled by Mr. David Gladstone, our chairman and chief executive officer. Mr. Gladstone also serves on the board of managers of Gladstone Securities.
	Dealer Manager Agreement
	In connection with the offering of our senior common stock (see Note 10, “Stockholders’ Equity,” for further details) we entered into a Dealer Manager Agreement, dated March 25, 2011, or the Dealer Manager Agreement, with Gladstone Securities pursuant to which Gladstone Securities agreed to act as our exclusive dealer manager in connection with the offering. Pursuant to the terms of the Dealer Manager Agreement, Gladstone Securities is entitled to receive a sales commission in the amount of 7.0% of the gross proceeds of the shares of senior common stock sold, plus a dealer manager fee in the amount of 3.0% of the gross proceeds of the shares of senior common stock sold. Gladstone Securities, in its sole and absolute discretion, may re-allocate all of its selling commissions attributable to a participating broker-dealer and may also re-allocate a portion of its dealer manager fee earned in respect of the proceeds generated by the participating broker-dealer to any participating broker-dealer as a non-accountable marketing allowance. In addition, we have agreed to indemnify Gladstone Securities against various liabilities, including certain liabilities arising under the federal securities laws. We made approximately $0.3 million and $0.4 million of payments during the three and nine months ended September 30, 2014 respectively, and we made approximately $0.05 million and $0.2 million of payments during the three and nine months ended September 30, 2013, respectively, to Gladstone Securities pursuant to this agreement, which are reflected as a component of senior common stock costs in the statement of stockholders’ equity. The Dealer Manager Agreement currently is scheduled to terminate on the earlier of (i) March 28, 2015 or (ii) the date on which 3,000,000 shares of senior common stock are sold pursuant to the Dealer Manager Agreement.
	Mortgage Financing Arrangement Agreement
	We also entered into an agreement with Gladstone Securities, effective June 18, 2013, for it to act as our non-exclusive agent to assist us with arranging mortgage financing for properties we own. In connection with this engagement, Gladstone Securities may from time to time solicit the interest of various commercial real estate lenders or recommend to us third party lenders offering credit products or packages that are responsive to our needs. We pay Gladstone Securities a financing fee in connection with the services it provides to us for securing mortgage financing on any of our properties. The amount of these financing fees, which are payable upon closing of the financing, are based on a percentage of the amount of the mortgage, generally ranging from 0.5% to a maximum of 1.0% of the mortgage obtained. The amount of the financing fees may be reduced or eliminated, as determined by us and Gladstone Securities, after taking into consideration various factors, including, but not limited to, the involvement of any third party brokers and market conditions. We paid financing fees to Gladstone Securities of $0.02 million and $0.1 million during the three and nine months ended September 30, 2014, respectively. We paid financing fees to Gladstone Securities of $0.04 million during both the three and nine months ended September 30, 2013. The agreement is scheduled to terminate on August 31, 2015, unless renewed or earlier terminated.

Loss_Per_Share_of_Common_Stock

Loss Per Share of Common Stock	9 Months Ended
	Sep. 30, 2014
Earnings Per Share [Abstract]	'
Loss Per Share of Common Stock	'
	3. Loss per Share of Common Stock
	The following tables set forth the computation of basic and diluted loss per share of common stock for the three and nine months ended September 30, 2014 and 2013, respectively. We computed basic loss per share for the three and nine months ended September 30, 2014 and 2013, respectively, using the weighted average number of shares outstanding during the periods. Diluted loss per share for the three and nine months ended September 30, 2014 and 2013, reflects additional shares of common stock, related to our convertible senior common stock, that would have been outstanding if dilutive potential shares of common stock had been issued, as well as an adjustment to net income available to common stockholders as applicable to common stockholders that would result from their assumed issuance (dollars in thousands, except per share amounts).
			For the three months ended September 30,						For the nine months ended September 30,
			2014			2013			2014			2013
	Calculation of basic loss per share of common stock:
	Net loss attributable to common stockholders		$	(931	)	$	(797	)	$	(15,483	)	$	(2,080	)
	Denominator for basic weighted average shares of common stock			17,739,084			14,196,423			16,685,162			12,613,354
	Basic loss per share of common stock		$	(0.05	)	$	(0.06	)	$	(0.93	)	$	(0.16	)
	Calculation of diluted loss per share of common stock:
	Net loss attributable to common stockholders		$	(931	)	$	(797	)	$	(15,483	)	$	(2,080	)
	Add: Income impact of assumed conversion of senior common stock (1)			—			—			—			—
	Net loss attributable to common stockholders plus assumed conversions		$	(931	)	$	(797	)	$	(15,483	)	$	(2,080	)
	Denominator for basic weighted average shares of common stock			17,739,084			14,196,423			16,685,162			12,613,354
	Effect of convertible senior common stock (1)			—			—			—			—
	Denominator for diluted weighted average shares of common stock			17,739,084			14,196,423			16,685,162			12,613,354
	Diluted loss per share of common stock		$	(0.05	)	$	(0.06	)	$	(0.93	)	$	(0.16	)
	-1	We excluded convertible senior common shares of 429,673 and 362,162 from the calculation of diluted earnings per share for the three and nine months ended September 30, 2014, respectively, because it was anti-dilutive. We also excluded convertible senior common shares of 257,429, and 217,010 from the calculation of diluted earnings per share for the three and nine months ended September 30, 2013, respectively, because it was anti-dilutive.

Real_Estate_and_Intangible_Ass

Real Estate and Intangible Assets	9 Months Ended
	Sep. 30, 2014
Property, Plant and Equipment [Abstract]	'
Real Estate and Intangible Assets	'
	4. Real Estate and Intangible Assets
	Real Estate
	The following table sets forth the components of our investments in real estate as of September 30, 2014 and December 31, 2013 (dollars in thousands):
			September 30, 2014			December 31, 2013
	Real estate:
	Land		$	86,737		$	79,153
	Building and improvements			573,149			527,230
	Tenant improvements			40,688			35,970
	Accumulated depreciation			(93,401	)		(81,241	)
	Real estate, net		$	607,173		$	561,112
	2014 Real Estate Activity
	During the nine months ended September 30, 2014, we acquired eight properties, which are summarized in the table below (dollars in thousands):
	Location		Acquisition			Square			Lease			Renewal			Total		Acquisition		Annualized			Debt Issued &
			Date			Footage			Term			Options			Purchase		Expenses		Straight			Assumed
															Price				Line Rent
	Allen, TX			3/27/14			21,154			12 Years			4 (5 years each)		$	5,525	$	33	$	570		$	3,481
	Colleyville, TX			3/27/14			20,355			12 Years			4 (5 years each)			4,523		33		467			2,849
	Rancho Cordova, CA (4)			4/22/14			61,358			10 Years			1 (5 year)			8,225		73		902			4,935
	Coppell, TX			5/8/14			21,171			12 Years			4 (5 years each)			5,838		26		601			3,816
	Columbus, OH			5/13/14			114,786			9.5 Years	(1)		N/A	(1)		11,800		70		1,278	(3)		N/A
	Taylor, PA			6/9/14			955,935			10 Years			4 (5 years each)			39,000		730		3,400			22,600
	Aurora, CO			7/1/14			124,800			15 Years			2 (5 years each)			8,300		91		768			N/A
	Indianapolis, IN (4)			9/3/14			86,495			11.5 Years	(2)		2 (5 years each)	(2)		10,500		58		1,504	(3)		6,100
	Total						1,406,054								$	93,711	$	1,114	$	9,490		$	43,781
	-1	Lease term and renewal options are reflective of the largest tenant. The smaller tenant’s lease terminates in November 2016 and contains no renewal options.
	-2	Lease term and renewal options are reflective of the largest tenant. The other tenants in the building have varying lease expirations from December 2015 to October 2018. No other tenants have renewal options.
	-3	Rent figure is reflective of aggregate rent among all tenants occupying the building.
	-4	Tenants occupying these properties are subject to a gross lease.
	In accordance with ASC 805, we determined the fair value of the acquired assets and liabilities assumed related to the eight properties acquired during the nine months ended September 30, 2014 as follows (in thousands):
			Land			Building			Tenant			In-place			Leasing		Customer		Above Market			Below Market			Premium on			Total Purchase
									Improvements			Leases			Costs		Relationships		Leases			Leases			Assumed Debt			Price
	Allen, TX		$	874		$	3,509		$	125		$	598		$	273	$	218	$	—		$	—		$	(72	)	$	5,525
	Colleyville, TX			1,277			2,307			117			486			220		181		—			(6	)		(59	)		4,523
	Rancho Cordova, CA			752			5,898			278			473			546		278		—			—			—			8,225
	Coppell, TX			1,448			3,221			128			636			293		230		—			—			(118	)		5,838
	Columbus, OH			990			6,080			1,937			823			719		990		261			—			—			11,800
	Taylor, PA			3,102			24,449			956			6,171			1,452		2,870		—			—			—			39,000
	Aurora, CO			2,882			3,825			92			413			806		282		—			—			—			8,300
	Indianapolis, IN			502			5,334			1,088			1,990			741		732		126			(13	)		—			10,500
			$	11,827		$	54,623		$	4,721		$	11,590		$	5,050	$	5,781	$	387		$	(19	)	$	(249	)	$	93,711
	Below is a summary of the total revenue and earnings recognized on the eight properties acquired during the three and nine months ended September 30, 2014 (dollars in thousands):
						For the three months ended September 30,						For the nine months ended September 30,
			Acquisition			2014						2014
	Location		Date			Rental Revenue			Earnings(1)			Rental Revenue			Earnings(1)
	Allen, TX			3/27/14		$	143		$	101		$	293		$	167
	Colleyville, TX			3/27/14			117			83			240			138
	Rancho Cordova, CA			4/22/14			226			104			399			168
	Coppell, TX			5/8/14			150			116			239			139
	Columbus, OH (2)			5/13/14			311			115			479			184
	Taylor, PA			6/9/14			850			395			1,058			493
	Aurora, CO			7/1/14			192			124			192			124
	Indianapolis, IN (2)			9/3/14			116			9			116			9
						$	2,105		$	1,047		$	3,016		$	1,422
	-1	Earnings is calculated as net income exclusive of both interest expense and acquisition related costs that are required to be expensed under ASC 805.
	-2	Rental revenue and earnings is reflective of aggregate rent and operating expenses among all tenants occupying the building.
	Pro Forma
	The following table reflects pro-forma consolidated statements of operations as if the eight properties acquired during the three and nine months ended September 30, 2014 were acquired as of the beginning of the previous period. The pro-forma earnings for the three and nine months ended September 30, 2014 and 2013 were adjusted to assume that acquisition-related costs were incurred as of the beginning of the previous period (dollars in thousands, except per share amounts):
			For the three months ended September 30,						For the nine months ended September 30,
			2014			2013			2014			2013
			(unaudited)						(unaudited)
	Operating Data:
	Total operating revenue		$	19,086		$	19,060		$	58,050		$	56,906
	Total operating expenses			(11,434	)		(10,538	)		(47,780	)(1)		(32,479	)
Other expenses			(7,283	)		(8,215	)		(21,269	)		(24,347	)
Net income (loss)			369			307			(10,999	)		80
Dividends attributable to preferred and senior common stock			(1,160	)		(1,106	)		(3,417	)		(3,274	)
Net loss attributable to common stockholders		$	(791	)	$	(799	)	$	(14,416	)	$	(3,194	)
Share and Per Share Data:
Basic and diluted loss per share of common stock		$	(0.04	)	$	(0.06	)	$	(0.86	)	$	(0.25	)
Weighted average shares outstanding-basic			17,739,084			14,196,423			16,685,162			12,613,354
Weighted average shares outstanding-diluted			17,739,084			14,196,423			16,685,162			12,613,354
-1	$14.2 million relates to the impairment charge recorded in operating expenses during the nine months ended September 30, 2014.
2013 Real Estate Activity
During the nine months ended September 30, 2013, we acquired five properties and completed an expansion of one property, which are summarized below (dollars in thousands):
Location		Acquisition/			Square			Lease			Renewal			Total Purchase/		Acquistion		Annualized Straight			Debt Issued
		Expansion Date			Footage			Term			Options			Expansion Price		Expenses		Line Rent
Egg Harbor Township, NJ			3/28/13			29,257			10 years			1 (5 years)		$	5,650	$	152	$	490		$	3,700
Clintonville, WI (1)			4/11/13			102,400			15 years			N/A			3,250		N/A		961			—
Vance, AL			5/8/13			170,000			10 years			2 (5 year options)			13,388		186		1,173			—
Blaine, MN			5/10/13			92,275			6.9 years			2 (5 year options)			14,450		79		1,475			8,200
Austin, TX			7/9/13			320,000			8 years			3 (3 year options)			57,000		155		4,641			35,300
Allen, TX (4)			7/10/13			115,200			11.5 years	(2)		2 (5 year options)	(2)		15,150		81		1,918	(3)		8,900
Total						829,132								$	108,888	$	653	$	10,658		$	56,100
-1	Property was originally acquired in November 2005 for $5.3 million. After the expansion completed in April 2013, the total investment in the property is $8.6 million.
-2	Lease term and renewal options are reflective of the largest tenant. The smaller tenant’s lease terminates in August 2021 and contains 2 (5 year) renewal options.
-3	Rent figure is reflective of aggregate rent among all tenants occupying the building.
-4	The larger tenant occupying this property is subject to a gross lease. The smaller tenant occupying this property is subject to a triple net lease.
In accordance with ASC 805, we determined the fair value of acquired assets related to the five properties acquired during the nine months ended September 30, 2013 as follows (in thousands):
		Land			Building			Tenant			In-place			Leasing		Customer		Above Market			Below			Total
								Improvements			Leases			Costs		Relationships		Leases			Market			Purchase
																					Leases			Price
Egg Harbor Township, NJ		$	1,627		$	2,735		$	282		$	558		$	189	$	259	$	—		$	—		$	5,650
Vance, AL			457			9,721			808			1,097			678		627		—			—			13,388
Blaine, MN			1,060			9,347			1,172			1,361			694		816		—			—			14,450
Austin, TX			2,330			37,207			6,814			6,118			1,906		3,793		—			(1,168	)		57,000
Allen, TX			2,699			5,758			2,187			1,525			1,146		1,499		336			—			15,150
		$	8,173		$	64,768		$	11,263		$	10,659		$	4,613	$	6,994	$	336		$	(1,168	)	$	105,638
Below is a summary of the total revenue and earnings recognized on the five properties acquired during the three and nine months ended September 30, 2013 (dollars in thousands):
					Rental Revenue						Net Income
Location		Acquisition Date			For the three months			For the nine months			For the three months			For the nine months
					ended September			ended September			ended September			ended September
					30, 2013			30, 2013			30, 2013(1)			30, 2013(1)
Egg Harbor Township, NJ			3/28/13		$	122		$	250		$	61		$	130
Vance, AL			5/8/13			293			464			147			218
Blaine, MN			5/10/13			369			579			161			256
Austin, TX			7/9/13			1,098			1,098			297			297
Allen, TX			7/10/13			325			325			136			136
					$	2,207		$	2,716		$	802		$	1,037
-1	Earnings is calculated as net income less interest expense and acquisition related costs that are required to be expensed under ASC 805.
Future Lease Payments
Future operating lease payments from tenants under non-cancelable leases, excluding tenant reimbursement of expenses, for the remainder of 2014 and each of the five succeeding fiscal years and thereafter is as follows (dollars in thousands):
Year		Tenant
		Lease Payments
Three Months ending December 31, 2014		$	16,929
2015			68,254
2016			65,416
2017			64,689
2018			64,103
2019			64,403
Thereafter			290,868
Significant Existing Real Estate Activity
On April 4, 2014, our tenant occupying our Newburyport, Massachusetts property notified us of their intention not to exercise their renewal option, as the tenant is relocating to Rhode Island. The tenant will continue paying rent and operating expenses through the lease termination date of April 30, 2015.
On May 6, 2014, we extended the lease with the tenant occupying our property located in Austin, Texas. The lease covering this property was extended for an additional eight years, through June 2022. The lease was originally set to expire in June 2015. The lease provides for prescribed rent escalations over the life of the lease, with annualized straight line rents of approximately $0.7 million. In connection with the extension of the lease and modification of certain terms of the lease, we paid $0.2 million in leasing commissions, and will pay a total of approximately $1.3 million in tenant improvements between now and second quarter 2015.
On June 11, 2014, we extended the lease with the tenant occupying our property located in Burnsville, Minnesota. The new lease covers approximately two-thirds of the space and was extended for an additional eight years, through January 2023. The lease was originally set to expire in June 2015. The tenant in this property will continue to pay rent on the entire building through June 2015, and we are working to identify tenants to lease the remaining one-third of the building. The new lease provides for prescribed rent escalations over the life of the lease, with annualized straight line rents of $1.0 million. Rental income per square foot increased 14% from the previous lease. The lease grants the tenant two options to extend the lease for an additional three years each. In connection with the extension of the lease and the modification of certain terms under the lease, we paid $0.5 million in leasing commissions, and will pay $3.3 million in tenant improvements between now and first quarter 2015.
On July 7, 2014, we extended the lease with one of the tenants occupying our property located in Akron, Ohio. The new lease covers approximately two-thirds of the space and was extended for an additional five years, through March 2020. The lease was originally set to expire in March 2015. This tenant will continue to pay its existing rent through March 2015. The new lease provides for prescribed rent escalations over the life of the lease, with annualized straight line rents of $0.6 million. The lease grants the tenant two options to extend the lease for an additional five years each. In connection with the extension of the lease and the modification of certain terms under the lease, we paid $0.2 million in leasing commissions, and $0.9 million in tenant improvements.
On August 1, 2014, we modified the leases with the tenants occupying our properties located in Austin and San Antonio, Texas. The leases covering these respective properties were adjusted to defer rental payments covering the period September 1, 2014 through November 30, 2014. The tenants are current on their rental payments through the quarter ended September 30, 2014.
On September 25, 2014, we modified the lease with the tenant occupying our property located in Concord Township, Ohio. The lease covering this property was adjusted to defer a portion of rental payments covering the period August 2014 through December 2014. The tenant will repay the deferred rent balance monthly during calendar year 2015. This rental deferral has no impact on the annualized straight line rents recognized on this property. The tenant is current on its rental payments through the quarter ended September 30, 2014.
Intangible Assets
The following table summarizes the carrying value of intangible assets and the accumulated amortization for each intangible asset class as of September 30, 2014 and December 31, 2013, respectively (dollars in thousands):
		September 30, 2014						December 31, 2013
		Lease			Accumulated			Lease			Accumulated
		Intangibles			Amortization			Intangibles			Amortization
In-place leases		$	58,925		$	(18,391	)	$	47,442		$	(15,158	)
Leasing costs			36,969			(11,419	)		31,339			(9,323	)
Customer relationships			40,909			(12,351	)		35,739			(10,407	)
		$	136,803		$	(42,161	)	$	114,520		$	(34,888	)
The weighted average amortization periods in years for the intangible assets acquired and liabilities assumed during the nine months ended September 30, 2014 and 2013, respectively, were as follows
Intangible Assets & Liabilities		2014			2013
In-place leases			10.2			8.8
Leasing costs			10.2			8.8
Customer relationships			14.6			13.5
Above market leases			9.3			8.8
Below market leases			9.9			7.2
All intangible assets & liabilities			11.5			9.9
The estimated aggregate amortization expense for the remainder of 2014 and for each of the five succeeding fiscal years and thereafter is as follows (dollars in thousands):
Year		Estimated
		Amortization Expense
Three Months ending December 31, 2014		$	3,049
2015			11,931
2016			11,224
2017			11,018
2018			10,719
2019			10,711
Thereafter			35,990

Real_Estate_Held_for_Sale_and_

Real Estate Held for Sale and Impairment Charges	9 Months Ended
	Sep. 30, 2014
Real Estate [Abstract]	'
Real Estate Held for Sale and Impairment Charges	'
	5. Real Estate Held for Sale and Impairment Charges
	Real Estate Held for Sale
	On June 6, 2014, we sold our property located in Sterling Heights, Michigan to the tenant currently occupying the building for $11.4 million and recognized a gain of $1.2 million on the sale.
	The table below summarizes the components of income from real estate and related assets held for sale for the three and nine months ended September 30, 2014 and September 30, 2013, respectively (dollars in thousands):
		For the three months ended September 30,				For the nine months ended September 30,
		2014		2013		2014		2013
	Operating revenue	$	—	$	292	$	507	$	875
	Operating expense		—		57		40		172
	Income from real estate and related assets held for sale	$	—	$	235	$	467	$	703
	Impairment Charges
	We performed the evaluation and analysis of our portfolio and concluded that our Roseville, Minnesota property was impaired as of March 31, 2014. We determined that the expected undiscounted cash flows based upon a revised estimated holding period of this property was below the current carrying value. The estimated holding period was revised after a potential tenant that we were anticipating to lease a large portion of the vacant space, during the three months ended March 31, 2014, did not execute a lease on the property. Consequently, we revised the holding period to coincide with the maturity of the mortgage loan in June 2014. Accordingly, we reduced the carrying value of this property to its estimated fair value, less cost to sell, and we recognized an impairment loss of $14.2 million during the nine months ended September 30, 2014. This property is in the process of being returned to the lender in a deed in lieu transaction, which is anticipated to occur during the quarter ending December 31, 2014.
	We had previously reported that our property located in South Hadley, Massachusetts was at risk of becoming impaired in the future. We recently received notification from the existing tenant that they will extend the lease on the property for two years, and it will now expire in January 2017. Because of this lease extension, we are no longer at risk at having to impair this property in the next year.
	We continue to monitor our portfolio for any other indicators of impairment.

Mortgage_Note_Receivable

Mortgage Note Receivable	9 Months Ended
	Sep. 30, 2014
Mortgage Loans on Real Estate [Abstract]	'
Mortgage Note Receivable	'
	6. Mortgage Note Receivable
	On July 25, 2014, we closed a $5.6 million second mortgage development loan for the construction of an 81,371 square foot, build-to-suit transitional care facility located on a major hospital campus in Phoenix, Arizona. Construction is scheduled to be completed in July 2015 and we will earn 9.0% interest, paid currently in cash, on the loan during construction and through maturity. Prior to completion of the facility, we will be granted a right of first offer to purchase the property at fair value. If we do not purchase the property we will receive an exit fee when the property is sold and the loan is repaid in an amount sufficient for us to earn an internal rate of return of 22% on the second mortgage development loan. The loan is scheduled to mature in July 2016, but has a one year extension option.

Mortgage_Notes_Payable_and_Lin

Mortgage Notes Payable and Line of Credit	9 Months Ended
	Sep. 30, 2014
Debt Disclosure [Abstract]	'
Mortgage Notes Payable and Line of Credit	'
	7. Mortgage Notes Payable and Line of Credit
	Our mortgage notes payable and line of credit as of September 30, 2014 and December 31, 2013 are summarized below (dollars in thousands):
							Carrying Value at
			Encumbered				September 30, 2014				December 31, 2013				Stated Interest		Scheduled Maturity
			properties at												Rates at		Dates at September
			September 30,												September 30,		30, 2014
			2014												2014 (4)
	Mortgage and Other Secured Loans:
	Fixed rate mortgage loans			72			$	451,375			$	413,678			-1		-2
	Variable rate mortgage loans			4				8,200				8,200			LIBOR + 2.15% (3)		12/1/16
	Premiums and discounts (net)			N/A				783				724			N/A		N/A
	Total Mortgage Notes Payable			76			$	460,358			$	422,602
	Variable rate Line of Credit			17				45,600				24,400			LIBOR + 2.75% (3)		8/1/17
	Total Mortgage Notes Payable and Line of Credit			93			$	505,958			$	447,002
	-1	Interest rates on our fixed rate mortgage notes payable vary from 4.04% to 6.80%.
	-2	We have 41 mortgage notes payable with maturity dates ranging from 9/1/2015 through 1/6/2039.
	-3	At September 30, 2014, one month LIBOR was approximately 0.15%.
	-4	The weighted average interest rate on all debt outstanding at September 30, 2014, was approximately 5.13%.
	N/A - Not Applicable
	Mortgage Notes Payable
	As of September 30, 2014, we had 41 mortgage notes payable, which were collateralized by a total of 76 properties with a net book value of $614.5 million. Gladstone Commercial Corporation has limited recourse liabilities that could result from any one or more of the following circumstances: a borrower voluntarily filing for bankruptcy, improper conveyance of a property, fraud or material misrepresentation, misapplication or misappropriation of rents, security deposits, insurance proceeds or condemnation proceeds, or physical waste or damage to the property resulting from a borrower’s gross negligence or willful misconduct. We will also indemnify lenders against claims resulting from the presence of hazardous substances or activity involving hazardous substances in violation of environmental laws on a property. The weighted-average interest rate on the mortgage notes payable as of September 30, 2014 was 5.35%.
	During the nine months ended September 30, 2014, we assumed two long-term mortgages, collateralized by three properties, and issued three long-term mortgages, collateralized by three properties, which are summarized below (dollars in thousands):
	Date of Issuance		Issuing Bank		Debt Issued				Interest Rate				Maturity Date
	3/27/14		Wells Fargo N.A.		$	6,330				5.58	%			2/1/16
	4/22/14		Keybank N.A.			4,935				4.9	%			5/1/24
	5/8/14		Wells Fargo N.A.			3,816				6.25	%			6/1/16
	6/9/14		Prudential Mortgage			22,600				4.23	%			7/1/19
			Capital Company
	9/3/14		Everbank			6,100				4.4	%			10/1/24
					$	43,781
	Scheduled principal payments of mortgage notes payable for the remainder of 2014, and each of the five succeeding fiscal years and thereafter are as follows (dollars in thousands):
	Year		Scheduled Principal
			Payments
	Three Months ending December 31, 2014		$	18,898
	2015			42,683
	2016			98,720
	2017			67,315
	2018			19,909
	2019			34,570
	Thereafter			177,480
			$	459,575
	Interest Rate Cap
	In November 2013, we entered into an interest rate cap agreement with Wells Fargo that caps the interest rate on the note payable for our Champaign, Illinois property. The agreement provides that the interest rate on the note payable for this property is capped at a certain interest rate when one-month LIBOR is in excess of 3.0%. The fair value of the interest rate cap agreement is recorded in other assets on our accompanying condensed consolidated balance sheets. We record changes in the fair value of the interest rate cap agreement quarterly based on the current market valuations at quarter end as other income (loss) on our accompanying condensed consolidated statements of operations. Generally, we will estimate the fair value of our interest rate cap using estimates of value provided by the counterparty and our own assumptions in the absence of observable market data, including estimated remaining life, counterparty credit risk, current market yield and interest rate spreads of similar securities as of the measurement date. At September 30, 2014, our interest rate cap agreement was valued using Level 3 inputs of the hierarchy established by ASC 820, “Fair Value Measurements and Disclosures.” The following table summarizes the key terms of each interest rate cap agreement (dollars in thousands):
															As of September 30,					As of December 31,
			Notional												2014					2013
	Interest Rate Cap		Amount				LIBOR Cap				Maturity Date				Cost			Fair Value		Cost		Fair Value
	26-Nov-13		$	8,200				3	%			December 1, 2016			$	31		$	7	$	31	$	22
	Fair Value
	The fair value of all mortgage notes payable outstanding as of September 30, 2014, was $467.5 million, as compared to the carrying value stated above of $460.4 million. The fair value is calculated based on a discounted cash flow analysis, using interest rates based on management’s estimate of market interest rates on long-term debt with comparable terms and loan to value ratios. The fair value was calculated using Level 3 inputs of the hierarchy established by ASC 820, “Fair Value Measurements and Disclosures.”
	Line of Credit
	In August 2013, we procured a $60.0 million senior unsecured revolving credit facility, or the Line of Credit, with KeyBank National Association (serving as a revolving lender, a letter of credit issuer and administrative agent) and Citizens Bank of Pennsylvania as an additional lender. On December 16, 2013, Comerica Bank was also added as an additional lender. On March 28, 2014, we amended our Line of Credit to extend the maturity date one additional year to August 2017. We also modified certain terms under the Line of Credit, including the calculation of the total asset value and unencumbered asset value. The applicable LIBOR margins were also reduced by 25 basis points at each pricing level. As a result of these modifications, the availability under our line of credit increased by $1.3 million.
	The Line of Credit initially matures in August 2017; however, we have a one-year extension option subject to the payment of an extension fee equal to 25 basis points on the initial maturity date and certain other customary conditions.
	The Line of Credit has a letter of credit sublimit of up to $20.0 million. In addition, we may expand the Line of Credit up to a total of $75.0 million upon satisfaction of certain conditions, including obtaining commitments from any one or more lenders, whether or not currently a party to the Line of Credit, to provide such increased amounts and payment of the associated up front and arrangement fees at the time of such increase. The interest rate per annum applicable to the Line of Credit is equal to the LIBOR plus an applicable margin of up to 3.0%, depending upon our leverage. The leverage ratio used in determining the applicable margin for interest on the Line of Credit is recalculated quarterly. We are subject to an annual maintenance fee of $0.03 million per year and an unused commitment fee of 25 basis points per year, which accrues quarterly. Our ability to access this source of financing is subject to our continued ability to meet customary lending requirements, such as compliance with financial and operating covenants and our meeting certain lending limits. One such covenant requires us to limit distributions to our stockholders to 100% of our FFO, with acquisition-related costs required to be expensed under ASC 805 added back to FFO. In addition, the maximum amount we may draw under the Line of Credit is based on a percentage of the value of a pool of unencumbered properties which must meet agreed upon eligibility standards.
	If and when long-term mortgages are arranged for properties in the unencumbered pool, the banks will reduce the availability under the Line of Credit by the amount advanced against that property’s value. Conversely, as we purchase new properties meeting the eligibility standards, we may add these new properties to the unencumbered pool to obtain additional availability under the Line of Credit. The availability under the Line of Credit is also reduced by letters of credit used in the ordinary course of business. We may use the advances under the Line of Credit for both general corporate purposes and the acquisition of new investments.
	As of September 30, 2014, there was $45.6 million outstanding under our Line of Credit at an interest rate of approximately 2.9% and $5.8 million outstanding under letters of credit at a weighted average interest rate of 2.75%. As of September 30, 2014, the maximum additional amount we could draw was $5.3 million. We were in compliance with all covenants under the Line of Credit as of September 30, 2014. The amount outstanding on the Line of Credit as of September 30, 2014 approximates fair value, because the debt is subject to a variable interest rate, determined by market forces, as well as a recently negotiated interest rate spread.

Mandatorily_Redeemable_Preferr

Mandatorily Redeemable Preferred Stock	9 Months Ended
	Sep. 30, 2014
Text Block [Abstract]	'
Mandatorily Redeemable Preferred Stock	'
	8. Mandatorily Redeemable Preferred Stock
	In February 2012, we completed a public offering of 1,540,000 shares of 7.125% Series C Cumulative Term Preferred Stock, par value $0.001 per share, or the Term Preferred Stock, at a public offering price of $25.00 per share. Gross proceeds of the offering totaled $38.5 million and net proceeds, after deducting offering expenses borne by us, were $36.7 million and were used to repay a portion of outstanding borrowings under our Line of Credit, for acquisitions of real estate and for working capital. The Term Preferred Stock is traded under the ticker symbol GOODN on the NASDAQ Global Select Market, or the NASDAQ. The Term Preferred Stock is not convertible into our common stock or any other security of ours. Generally, we may not redeem shares of the Term Preferred Stock prior to January 31, 2016, except in limited circumstances to preserve our status as a REIT. On or after January 31, 2016, we may redeem the shares at a redemption price of $25.00 per share, plus any accumulated and unpaid dividends to and including the date of redemption. The shares of the Term Preferred Stock have a mandatory redemption date of January 31, 2017. We incurred $1.8 million in total offering costs related to these transactions, which have been recorded as deferred financing costs on the condensed consolidated balance sheets and will be amortized over the redemption period ending January 31, 2017.
	The Term Preferred Stock is recorded as liability in accordance with ASC 480, “Distinguishing Liabilities from Equity,” which states that mandatorily redeemable financial instruments should be classified as liabilities and therefore the related dividend payments are treated as a component of interest expense in the condensed consolidated statements of operations.
	The fair value of our Term Preferred Stock as of September 30, 2014, was $40.5 million, as compared to the carrying value stated above of $38.5 million. The fair value is calculated based on the closing share price as of September 30, 2014 of $26.28. The fair value was calculated using Level 1 inputs of the hierarchy established by ASC 820, “Fair Value Measurements and Disclosures.”

Commitments_and_Contingencies

Commitments and Contingencies	9 Months Ended
	Sep. 30, 2014
Commitments and Contingencies Disclosure [Abstract]	'
Commitments and Contingencies	'
	9. Commitments and Contingencies
	Ground Leases
	We are obligated as lessee under three ground leases. Future minimum rental payments due under the terms of these leases for the remainder of 2014 and each of the five succeeding years and thereafter, are as follows (dollars in thousands):
				For the year ended December 31,
	Location	Lease End Date		2014		2015		2016		2017		2018		2019		Thereafter
	Tulsa, OK		21-Apr	$	38	$	153	$	153	$	153	$	153	$	153	$	229
	Dartmouth, MA		May-36		44		174		174		174		174		174		3,300
	Springfield, MA		Feb-30		21		86		86		89		90		90		972
				$	103	$	413	$	413	$	416	$	417	$	417	$	4,501
	Rental expense for the properties listed above is recorded straight-line over the term of the lease and was $0.3 million during both the nine months ended September 30, 2014 and 2013. Rental expenses are reflected in property operating expenses on the condensed consolidated statements of operations.
	Tenant Improvements
	We have committed to provide tenant improvement funding for certain properties. The following table reflects unconditional purchase obligations which have not been recognized on the balance sheet as of September 30, 2014. Future tenant improvement payments due on these properties for the remainder of 2014 and each of the five succeeding years and thereafter, are as follows (dollars in thousands):
				For the year ended December 31,
	Location	Lease End Date		2014		2015		2016		2017		2018		2019		Thereafter
	Burnsville, MN		23-Jan	$	53	$	1,000	$	—	$	—	$	—	$	—	$	—
				$	53	$	1,000	$	—	$	—	$	—	$	—	$	—

Stockholders_Equity

Stockholders' Equity	9 Months Ended
	Sep. 30, 2014
Equity [Abstract]	'
Stockholders' Equity	'
	10. Stockholders’ Equity
	The following table summarizes the changes in our stockholders’ equity for the nine months ended September 30, 2014 (dollars in thousands):
														Distributions in
								Additional			Notes			Excess of			Total
		Preferred		Senior Common		Common		Paid in			Receivable			Accumulated			Stockholders’
		Stock		Stock		Stock		Capital			from Employees			Earnings			Equity
	Balance at December 31, 2013	$	2	$	—	$	16	$	298,751		$	(375	)	$	(115,248	)	$	183,146
	Issuance of senior common stock and common stock, net		—		1		2		40,332			—			—			40,335
	Distributions declared to common, senior common and preferred stockholders		—		—		—		—			—			(22,219	)		(22,219	)
	Net loss		—		—		—		—			—			(12,066	)		(12,066	)
	Balance at September 30, 2014	$	2	$	1	$	18	$	339,083		$	(375	)	$	(149,533	)	$	189,196
	Distributions
	Our Board of Directors declared the following distributions per share for the three and nine months ended September 30, 2014 and 2013:
		For the three months ended September 30,				For the nine months ended September 30,
		2014		2013		2014		2013
	Common Stock	$	0.375	$	0.375	$	1.125	$	1.125
	Senior Common Stock		0.2625		0.2625		0.7875		0.7875
	Series A Preferred Stock		0.4843749		0.4843749		1.4531247		1.4531247
	Series B Preferred Stock		0.4688		0.4688		1.4063		1.4063
	Series C Preferred Stock		0.4453		0.4453		1.3359		1.3359
	Recent Activity
	On June 6, 2014, we completed a public offering of 1,610,000 shares of our common stock at a public offering price of $17.00 per share. Gross proceeds of the offering totaled $27.4 million and net proceeds, after deducting offering expenses borne by us, were $26.0 million, which we used to acquire real estate.
	Ongoing Activity
	On September 2, 2014, we entered into an open market sale arrangement, or the ATM Program, with Cantor Fitzgerald & Co., or Cantor Fitzgerald, pursuant to which we may, from time to time, offer to sell shares of our common stock with an aggregate sales price of up to $100.0 million on the open market through Cantor Fitzgerald, acting as sales agent and/or principal. Under the open market sales arrangement, Cantor Fitzgerald is entitled to compensation equal to up to 2.0% of the gross proceeds of the common shares it sells. During the three months ended September 30, 2014, we sold a total of 0.2 million shares with aggregate net proceeds of $3.3 million, and have a remaining capacity to sell up to $96.6 million of common stock under the ATM program with Cantor Fitzgerald.
	On August 26, 2014, we provided notice of our termination of our prior open market sale arrangement, or the Prior ATM program, with Jefferies LLC, or Jefferies, under which we offered to sell shares of our common stock with an aggregate sales price of up to $25.0 million on the open market through Jefferies, as agent, or to Jefferies, as principal. From November 2009 through August 2014, we issued and sold $21.8 million in gross proceeds under the Prior ATM program. During the nine months ended September 30, 2014, we raised approximately $7.6 million in net proceeds under the Prior ATM program.
	In March 2011, we commenced an offering of an aggregate of 3,500,000 shares of our senior common stock, par value $0.001 per share, at a price to the public of $15.00 per share, of which 3,000,000 shares are intended to be offered pursuant to the primary offering and 500,000 shares are intended to be offered pursuant to our senior common distribution reinvestment plan, or the DRIP. We, however, reserve the right to reallocate the number of shares being offered between the primary offering and the DRIP. As of September 30, 2014, we had sold 593,659 shares of senior common stock in this ongoing offering, for gross proceeds of $8.9 million, and issued an additional 18,479 shares of senior common stock under the DRIP program.
	Note to Employee
	The following table is a summary of the outstanding note receivable from an employee of the Adviser for the exercise of stock options (dollars in thousands):
	Date Issued	Outstanding Balance		Outstanding Balance		Maturity Date		Interest Rate
		of Employee Loan at		of Employee Loan at		of Note		on Note
		September 30, 2014		December 31, 2013
	Nov-06	$	375	$	375		Nov 2015		8.15	%
	In accordance with ASC 505-10-45-2, “Equity,” receivables from employees for the issuance of capital stock to employees prior to the receipt of cash payment should be reflected in the balance sheet as a reduction to stockholders’ equity. Therefore, this note was recorded as a full recourse loan to the employee and is included in the equity section of the accompanying condensed consolidated balance sheets. As of September 30, 2014, this loan maintained its full recourse status.

Subsequent_Events

Subsequent Events	9 Months Ended
	Sep. 30, 2014
Subsequent Events [Abstract]	'
Subsequent Events	'
	11. Subsequent Events
	On October 7, 2014, our Board of Directors declared the following monthly distributions:
	Record Date	Payment Date	Common Stock		Series A Preferred		Series B Preferred		Series C Preferred
			Distributions per Share		Distributions per Share		Distributions per Share		Distributions per Share
	October 22, 2014	31-Oct-14	$	0.125	$	0.1614583	$	0.15625	$	0.1484375
	November 17, 2014	November 26, 2014		0.125		0.1614583		0.15625		0.1484375
	December 19, 2014	31-Dec-14		0.125		0.1614583		0.15625		0.1484375
	Total		$	0.375	$	0.4843749	$	0.46875	$	0.4453125
	Senior Common Stock Distributions
	Payable to the	Payment Date	Distribution per Share
	Holders of Record
	During the Month of:
	October	November 7, 2014	$	0.0875
	November	December 5, 2014		0.0875
	December	8-Jan-15		0.0875
	Total		$	0.2625
	On October 16, 2014, we executed a lease with a tenant to occupy our previously vacant property located in Richmond, Virginia. The lease was effective as of September 8, 2014 and has a three-year term. The tenant has an early termination option at any time after July 31, 2016, contingent upon the tenant losing a contract with the vendor supporting their operations in our building. The tenant is subject to a termination payment of approximately $0.03 million if they exercise this option. The lease provides for prescribed rent escalations over the life of the lease, with annualized straight line rents of approximately $0.2 million. The tenant has one option to renew the lease for an additional period of three years. In connection with the extension of the lease and modification of certain terms of the lease, we paid $0.1 million in leasing commissions, no tenant improvements were paid in connection with the lease extension.
	On October 22, 2014, we extended the lease with the tenant occupying our property located in Canton, North Carolina. We financed a $5.5 million expansion project on this property, which added an additional 150,000 square feet to the building, which was completed in September 2014. The lease covering this property was extended for an additional 10 years, through September 2034. The lease was originally set to expire in July 2024. The lease provides for prescribed rent escalations over the life of the lease, with annualized straight line rents of approximately $1.4 million, as compared to straight line rents of $0.6 million under the previous lease.
	On October 27, 2014, we extended the lease with the tenant occupying our property located in South Hadley, Massachusetts. The lease covering this property was extended for an additional two years through January 2017. The lease was originally set to expire in January 2015. The lease provides a scheduled rent increase over the previous lease, with annualized straight line rents of approximately $0.3 million. The tenant has two options to renew the lease for additional periods of one year each.

Organization_Basis_of_Presenta1

Organization, Basis of Presentation and Significant Accounting Policies (Policies)	9 Months Ended
	Sep. 30, 2014
Accounting Policies [Abstract]	'
Subsidiaries	'
	Subsidiaries
	We conduct substantially all of our operations through a subsidiary, Gladstone Commercial Limited Partnership, a Delaware limited partnership, or the Operating Partnership. As we currently own all of the general and limited partnership interests of the Operating Partnership through two of our subsidiaries, GCLP Business Trust I and II, the financial position and results of operations of the Operating Partnership are consolidated with those of the Company.
	Gladstone Commercial Lending, LLC, a Delaware limited liability company, or Gladstone Commercial Lending, a subsidiary of ours, was created to conduct all operations related to real estate mortgage loans of the Company. As the Operating Partnership currently owns all of the membership interests of Gladstone Commercial Lending, the financial position and results of operations of Gladstone Commercial Lending are consolidated with ours.
	Gladstone Commercial Advisers, Inc., a Delaware corporation, or Commercial Advisers, and a wholly-owned subsidiary of ours, is a taxable REIT subsidiary, or TRS, which was created to collect any non-qualifying income related to our real estate portfolio. There has been no such income earned to date. Since we own 100% of the voting securities of Commercial Advisers, the financial position and results of operations of Commercial Advisers are consolidated with ours.
	GCLP Business Trust I and GCLP Business Trust II, each a subsidiary and business trust of ours, were formed under the laws of the Commonwealth of Massachusetts on December 28, 2005. We transferred our 99% limited partnership interest in the Operating Partnership to GCLP Business Trust I in exchange for 100 shares of the trust. Gladstone Commercial Partners, LLC transferred its 1% general partnership interest in the Operating Partnership to GCLP Business Trust II in exchange for 100 trust shares.
Interim Financial Information	'
	Interim Financial Information
	Our interim financial statements are prepared in accordance with U.S. generally accepted accounting principles, or GAAP, for interim financial information and pursuant to the requirements for reporting on Form 10-Q and in accordance with Article 10 of Regulation S-X. Accordingly, certain disclosures accompanying annual financial statements prepared in accordance with GAAP are omitted. The year-end balance sheet data presented herein was derived from audited financial statements, but does not include all disclosures required by GAAP. In the opinion of our management, all adjustments, consisting solely of normal recurring accruals, necessary for the fair presentation of financial statements for the interim period, have been included. The interim financial statements and notes thereto should be read in conjunction with the financial statements and notes thereto included in our Form 10-K for the year ended December 31, 2013, as filed with the U.S. Securities and Exchange Commission on February 18, 2014. The results of operations for the three and nine months ended September 30, 2014 are not necessarily indicative of the results that may be expected for other interim periods or for the full fiscal year.
Out-of-Period Adjustment	'
	Out-of-Period Adjustment
	During the three months ended September 30, 2014, we recorded an adjustment to our impairment charge and to deferred rent receivable that were related to the impairment of our Roseville, Minnesota property in March 2014. As a result of the correction of these errors, we understated net income by $0.3 million for the three months ended September 30, 2014, there was no impact to the net income for the nine months ended September 30, 2014. We concluded that these adjustments were not material to the results of operations for any interim period presented.
Use of Estimates	'
	Use of Estimates
	The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting periods. Actual results could materially differ from those estimates.
Real Estate and Lease Intangibles	'
	Real Estate and Lease Intangibles
	We record investments in real estate at cost and capitalize improvements and replacements when they extend the useful life or improve the efficiency of the asset. We expense costs of repairs and maintenance as such costs are incurred. We compute depreciation using the straight-line method over the estimated useful life, or 39 years, for buildings and improvements, 5 to 20 years for equipment and fixtures, and the shorter of the useful life or the remaining lease term for tenant improvements and leasehold interests.
	Certain of our acquisitions involve sale-leaseback transactions with newly-originated leases, which we account for as asset acquisitions under Accounting Standards Codification, or ASC, 805, “Business Combinations.” In the case of an asset acquisition, we will capitalize the transaction costs incurred in connection with the acquisition. Other of our acquisitions involve the acquisition of properties that are already being operated as rental properties, which we will generally consider to be a business combination under ASC 805. Business combination guidance is generally applicable to us when properties are acquired with leases in place at the time of acquisition. When an acquisition is considered a business combination, ASC 805 requires that the purchase price of real estate be allocated to the acquired tangible assets and liabilities, consisting of land, building, tenant improvements, long-term debt assumed and identified intangible assets and liabilities, typically the value of above-market and below-market leases, the value of in-place leases, the value of unamortized lease origination costs and the value of tenant relationships, based in each case on their fair values. ASC 805 also requires that all expenses related to an acquisition accounted for as a business combination to be expensed as incurred, rather than capitalized into the cost of the acquisition.
	Management’s estimates of fair value are made using methods similar to those used by independent appraisers (e.g. discounted cash flow analysis). Factors considered by management in its analysis include an estimate of carrying costs during hypothetical expected lease-up periods considering current market conditions and costs to execute similar leases. We also consider information obtained about each property as a result of our pre-acquisition due diligence, marketing and leasing activities in estimating the fair value of the tangible and intangible assets acquired and liabilities assumed. In estimating carrying costs, management also includes lost reimbursement of real estate taxes, insurance and other operating expenses as well as estimates of lost rentals at market rates during the hypothetical expected lease-up periods, which primarily range from 9 to 18 months, depending on specific local market conditions. Management also estimates costs to execute similar leases, including leasing commissions, legal and other related expenses to the extent that such costs are not already incurred in connection with a new lease origination as part of the transaction.
	We allocate purchase price to the fair value of the tangible assets of an acquired property by valuing the property as if it were vacant. The “as-if-vacant” value is allocated to land, building and tenant improvements based on management’s determination of the relative fair values of these assets. Real estate depreciation expense on these tangible assets was $4.8 million and $13.8 million for the three and nine months ended September 30, 2014, respectively, and $4.2 million and $11.2 million for the three and nine months ended September 30, 2013, respectively.
	Above-market and below-market in-place lease fair values for owned properties are recorded based on the present value (using an interest rate which reflects the risks associated with the leases acquired) of the difference between (i) the contractual amounts to be paid pursuant to the in-place leases and (ii) management’s estimate of fair market lease rates for the corresponding in-place leases, measured over a period equal to the remaining non-cancelable term of the lease. When determining the non-cancelable term of the lease, we evaluate if fixed-rate renewal options, if any, should be included. The capitalized above-market lease values, included in the accompanying condensed consolidated balance sheets as part of deferred rent receivable, are amortized as a reduction of rental income over the remaining non-cancelable terms of the respective leases. Total amortization related to above-market lease values was $0.1 million and $0.2 million for both the three and nine months ended September 30, 2014 and 2013, respectively. The capitalized below-market lease values, included in the accompanying condensed consolidated balance sheets as part of deferred rent liability, are amortized as an increase to rental income over the remaining non-cancelable terms of the respective leases, including any below market renewal periods. Total amortization related to below-market lease values was $0.2 million and $0.5 million for the three and nine months ended September 30, 2014, respectively, and $0.2 million and $0.4 million for the three and nine months ended September 30, 2013, respectively.
	The total amount of the remaining intangible assets acquired, which consists of in-place lease values, unamortized lease origination costs, and customer relationship intangible values, are allocated based on management’s evaluation of the specific characteristics of each tenant’s lease and our overall relationship with that respective tenant. Characteristics to be considered by management in determining these values include the nature and extent of our existing business relationships with the tenant, growth prospects for developing new business with the tenant, the tenant’s credit quality and our expectations of lease renewals (including those existing under the terms of the lease agreement), among other factors.
	The value of in-place leases and lease origination costs are amortized to expense over the remaining term of the respective leases, which generally range from 10 to 15 years. The value of customer relationship intangibles, which is the benefit to us resulting from the likelihood of an existing tenant renewing its lease, are amortized to expense over the remaining term and any anticipated renewal periods in the respective leases, but in no event does the amortization period for intangible assets exceed the remaining depreciable life of the building. Should a tenant terminate its lease, the unamortized portion of the above-market and below-market lease values would be charged to rental income and the unamortized portion of in-place lease values, lease origination costs and customer relationship intangibles will be immediately charged to amortization expense. Total amortization expense related to these intangible assets and liabilities was $2.6 million and $7.2 million for the three and nine months ended September 30, 2014, respectively, and $2.0 million and $5.2 million for the three and nine months ended September 30, 2013, respectively.
Business Combinations	'
	Certain of our acquisitions involve sale-leaseback transactions with newly-originated leases, which we account for as asset acquisitions under Accounting Standards Codification, or ASC, 805, “Business Combinations.” In the case of an asset acquisition, we will capitalize the transaction costs incurred in connection with the acquisition. Other of our acquisitions involve the acquisition of properties that are already being operated as rental properties, which we will generally consider to be a business combination under ASC 805. Business combination guidance is generally applicable to us when properties are acquired with leases in place at the time of acquisition. When an acquisition is considered a business combination, ASC 805 requires that the purchase price of real estate be allocated to the acquired tangible assets and liabilities, consisting of land, building, tenant improvements, long-term debt assumed and identified intangible assets and liabilities, typically the value of above-market and below-market leases, the value of in-place leases, the value of unamortized lease origination costs and the value of tenant relationships, based in each case on their fair values. ASC 805 also requires that all expenses related to an acquisition accounted for as a business combination to be expensed as incurred, rather than capitalized into the cost of the acquisition.
Impairment Charges	'
	Impairment Charges
	We account for the impairment of real estate, including intangible assets, in accordance with ASC 360-10-35, “Property, Plant, and Equipment,” which requires us to periodically review the carrying value of each property to determine if circumstances indicate impairment of the carrying value of the investment exists or that depreciation periods should be modified. If circumstances indicate the possibility of impairment, we prepare a projection of the undiscounted future cash flows, without interest charges, of the specific property and determine if the carrying value of the investment in such property is recoverable. In performing the analysis, we consider such factors as each tenant’s payment history and financial condition, the likelihood of lease renewal, business conditions in the industry in which the tenants operate, whether there are indications that the fair value of the real estate has decreased and our intended holding period of the property. If the carrying amount is more than the aggregate undiscounted future cash flows, we would recognize an impairment loss to the extent the carrying amount exceeds the estimated fair value, less cost to sell, of the property. We evaluate our entire portfolio of properties each quarter for any impairment indicators and perform an impairment analysis on those select properties that have an indication of impairment.
Deferred Financing Costs	'
	Deferred Financing Costs
	Deferred financing costs consist of costs incurred to obtain financing, including legal fees, origination fees and administrative fees. The costs are deferred and amortized using the straight-line method, which approximates the effective interest method, over the term of the secured financing. We made payments of $0.1 million and $0.7 million for deferred financing costs during the three and nine months ended September 30, 2014, respectively, and payments of $1.3 million and $1.5 million during the three and nine months ended September 30, 2013, respectively. Total amortization expense related to deferred financing costs is included in interest expense and was $0.4 million and $1.2 million for the three and nine months ended September 30, 2014, respectively, and $0.6 million and $1.4 million for the three and nine months ended September 30, 2013, respectively.
Revenue Recognition	'
	Revenue Recognition
	Rental revenue includes rents that each tenant pays in accordance with the terms of its respective lease reported evenly over the non-cancelable term of the lease. Most of our leases contain rental increases at specified intervals. We recognize such revenues on a straight-line basis. Deferred rent receivable in the accompanying condensed consolidated balance sheet includes the cumulative difference between rental revenue, as recorded on a straight-line basis, and rents received from the tenants in accordance with the lease terms, along with the capitalized above-market in-place lease values of certain acquired properties. Accordingly, we determine, in our judgment, to what extent the deferred rent receivable applicable to each specific tenant is collectable. We review deferred rent receivable, as it relates to straight line rents, on a quarterly basis and take into consideration the tenant’s payment history, the financial condition of the tenant, business conditions in the industry in which the tenant operates and economic conditions in the geographic area in which the property is located. In the event that the collectability of deferred rent with respect to any given tenant is in doubt, we record an allowance for uncollectable accounts or record a direct write-off of the specific rent receivable. No such reserves or direct write-offs have been recorded to date.
	Management considers its loans and other lending investments to be held-for-investment. We reflect our loans classified as long-term investments at amortized cost, less allowance for loan losses, acquisition premiums or discounts, and deferred loan fees. On occasion, we may acquire loans at small premiums or discounts based on the credit characteristics of such loans. These premiums or discounts would be recognized as yield adjustments over the lives of the related loans. Loan origination fees, as well as direct loan origination costs, are also deferred and recognized over the lives of the related loans as yield adjustments. If loans with premiums, discounts, or loan origination fees are prepaid, we would immediately recognize the unamortized portion as a decrease or increase in the prepayment gain or loss. Interest income is recognized using the effective interest method applied on a loan-by-loan basis. Prepayment penalties or yield maintenance payments from borrowers are recognized as additional income when received.
	Tenant recovery revenue includes payments from tenants as reimbursements for franchise taxes, management fees, insurance, and ground lease payments. We recognize tenant recovery revenue in the same periods that we incur the related expenses.
Asset Retirement Obligations	'
	Asset Retirement Obligations
	ASC 410, “Asset Retirement and Environmental Obligation,” requires an entity to recognize a liability for a conditional asset retirement obligation when incurred if the liability can be reasonably estimated. ASC 410-20-20 clarifies that the term “Conditional Asset Retirement Obligation” refers to a legal obligation (pursuant to existing laws or by contract) to perform an asset retirement activity in which the timing and/or method of settlement are conditional on a future event that may or may not be within the control of the entity. ASC 410-20-25-6 clarifies when an entity would have sufficient information to reasonably estimate the fair value of an asset retirement obligation. We have accrued a liability and corresponding increase to the cost of the related properties for disposal related to all properties constructed prior to 1985 that have, or may have, asbestos present in the building. The liabilities are accreted over the life of the leases for the respective properties. We accrued $0.2 million in liabilities in connection with acquisitions during the nine months ended September 30, 2014. There were no liabilities accrued during the nine months ended September 30, 2013. We recorded expenses of $0.04 million and $0.1 million during the three and nine months ended September 30, 2014, respectively, and $0.03 million and $0.1 million during the three and nine months ended September 30, 2013, respectively, to general and administrative expense. Costs of future expenditures for obligations are discounted to their present value. The aggregate undiscounted obligation on all properties is $9.5 million and the discount rates used in the calculations range from 2.5% to 7.6%. We do not expect to make any payments in conjunction with these obligations in each of the next five years.
Comprehensive Income (Loss)	'
	Comprehensive Income (Loss)
	For the three and nine months ended September 30, 2014 and 2013, comprehensive income (loss) equaled net income (loss); therefore, a separate statement of comprehensive income (loss) is not included in the accompanying condensed consolidated financial statements.
Recently Issued Accounting Guidance	'
	Recently Issued Accounting Guidance
	The Financial Accounting Standards Board, or FASB, issued Accounting Standards Update No. 2014-08, “Presentation of Financial Statements (Topic 205) and Property, Plant, and Equipment (Topic 360): Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity.” Under this revised guidance, only disposals representing a strategic shift in operations, such as a disposal of a major geographic area, a major line of business or a major equity method investment, will be presented as discontinued operations. This standard is effective for our fiscal year beginning January 1, 2015; however, the FASB has permitted early adoption beginning with the first quarter of 2014. We adopted this standard as of March 31, 2014. We anticipate the adoption will result in most disposals not qualifying for discontinued operations presentation.
	In May 2014, the FASB issued a new accounting standard, or ASC, “Revenue from Contracts with Customers (ASC 606).” The revenue standard contains principles that an entity will apply to determine the measurement of revenue and timing of when it is recognized. This standard is effective for our fiscal year beginning January 1, 2017 and we are currently evaluating any impact from adoption.
Fair Value Measurements and Disclosures	'
	In November 2013, we entered into an interest rate cap agreement with Wells Fargo that caps the interest rate on the note payable for our Champaign, Illinois property. The agreement provides that the interest rate on the note payable for this property is capped at a certain interest rate when one-month LIBOR is in excess of 3.0%. The fair value of the interest rate cap agreement is recorded in other assets on our accompanying condensed consolidated balance sheets. We record changes in the fair value of the interest rate cap agreement quarterly based on the current market valuations at quarter end as other income (loss) on our accompanying condensed consolidated statements of operations. Generally, we will estimate the fair value of our interest rate cap using estimates of value provided by the counterparty and our own assumptions in the absence of observable market data, including estimated remaining life, counterparty credit risk, current market yield and interest rate spreads of similar securities as of the measurement date. At September 30, 2014, our interest rate cap agreement was valued using Level 3 inputs of the hierarchy established by ASC 820, “Fair Value Measurements and Disclosures.” The following table summarizes the key terms of each interest rate cap agreement (dollars in thousands):
Distinguishing Liabilities from Equity	'
	The Term Preferred Stock is recorded as liability in accordance with ASC 480, “Distinguishing Liabilities from Equity,” which states that mandatorily redeemable financial instruments should be classified as liabilities and therefore the related dividend payments are treated as a component of interest expense in the condensed consolidated statements of operations.
Equity	'
	In accordance with ASC 505-10-45-2, “Equity,” receivables from employees for the issuance of capital stock to employees prior to the receipt of cash payment should be reflected in the balance sheet as a reduction to stockholders’ equity. Therefore, this note was recorded as a full recourse loan to the employee and is included in the equity section of the accompanying condensed consolidated balance sheets. As of September 30, 2014, this loan maintained its full recourse status.

Loss_Per_Share_of_Common_Stock1

Loss Per Share of Common Stock (Tables)	9 Months Ended
	Sep. 30, 2014
Earnings Per Share [Abstract]	'
Basic and Diluted Loss Per Share of Common Stock	'
	The following tables set forth the computation of basic and diluted loss per share of common stock for the three and nine months ended September 30, 2014 and 2013, respectively. We computed basic loss per share for the three and nine months ended September 30, 2014 and 2013, respectively, using the weighted average number of shares outstanding during the periods. Diluted loss per share for the three and nine months ended September 30, 2014 and 2013, reflects additional shares of common stock, related to our convertible senior common stock, that would have been outstanding if dilutive potential shares of common stock had been issued, as well as an adjustment to net income available to common stockholders as applicable to common stockholders that would result from their assumed issuance (dollars in thousands, except per share amounts).
			For the three months ended September 30,						For the nine months ended September 30,
			2014			2013			2014			2013
	Calculation of basic loss per share of common stock:
	Net loss attributable to common stockholders		$	(931	)	$	(797	)	$	(15,483	)	$	(2,080	)
	Denominator for basic weighted average shares of common stock			17,739,084			14,196,423			16,685,162			12,613,354
	Basic loss per share of common stock		$	(0.05	)	$	(0.06	)	$	(0.93	)	$	(0.16	)
	Calculation of diluted loss per share of common stock:
	Net loss attributable to common stockholders		$	(931	)	$	(797	)	$	(15,483	)	$	(2,080	)
	Add: Income impact of assumed conversion of senior common stock (1)			—			—			—			—
	Net loss attributable to common stockholders plus assumed conversions		$	(931	)	$	(797	)	$	(15,483	)	$	(2,080	)
	Denominator for basic weighted average shares of common stock			17,739,084			14,196,423			16,685,162			12,613,354
	Effect of convertible senior common stock (1)			—			—			—			—
	Denominator for diluted weighted average shares of common stock			17,739,084			14,196,423			16,685,162			12,613,354
	Diluted loss per share of common stock		$	(0.05	)	$	(0.06	)	$	(0.93	)	$	(0.16	)
	-1	We excluded convertible senior common shares of 429,673 and 362,162 from the calculation of diluted earnings per share for the three and nine months ended September 30, 2014, respectively, because it was anti-dilutive. We also excluded convertible senior common shares of 257,429, and 217,010 from the calculation of diluted earnings per share for the three and nine months ended September 30, 2013, respectively, because it was anti-dilutive.

Real_Estate_and_Intangible_Ass1

Real Estate and Intangible Assets (Tables)	9 Months Ended
	Sep. 30, 2014
Property, Plant and Equipment [Abstract]	'
Company's Investments in Real Estate	'
	The following table sets forth the components of our investments in real estate as of September 30, 2014 and December 31, 2013 (dollars in thousands):
			September 30, 2014			December 31, 2013
	Real estate:
	Land		$	86,737		$	79,153
	Building and improvements			573,149			527,230
	Tenant improvements			40,688			35,970
	Accumulated depreciation			(93,401	)		(81,241	)
	Real estate, net		$	607,173		$	561,112
Summary of Properties Acquired	'
	2014 Real Estate Activity
	During the nine months ended September 30, 2014, we acquired eight properties, which are summarized in the table below (dollars in thousands):
	Location		Acquisition			Square			Lease			Renewal			Total		Acquisition		Annualized			Debt Issued &
			Date			Footage			Term			Options			Purchase		Expenses		Straight			Assumed
															Price				Line Rent
	Allen, TX			3/27/14			21,154			12 Years			4 (5 years each)		$	5,525	$	33	$	570		$	3,481
	Colleyville, TX			3/27/14			20,355			12 Years			4 (5 years each)			4,523		33		467			2,849
	Rancho Cordova, CA (4)			4/22/14			61,358			10 Years			1 (5 year)			8,225		73		902			4,935
	Coppell, TX			5/8/14			21,171			12 Years			4 (5 years each)			5,838		26		601			3,816
	Columbus, OH			5/13/14			114,786			9.5 Years	(1)		N/A	(1)		11,800		70		1,278	(3)		N/A
	Taylor, PA			6/9/14			955,935			10 Years			4 (5 years each)			39,000		730		3,400			22,600
	Aurora, CO			7/1/14			124,800			15 Years			2 (5 years each)			8,300		91		768			N/A
	Indianapolis, IN (4)			9/3/14			86,495			11.5 Years	(2)		2 (5 years each)	(2)		10,500		58		1,504	(3)		6,100
	Total						1,406,054								$	93,711	$	1,114	$	9,490		$	43,781
	-1	Lease term and renewal options are reflective of the largest tenant. The smaller tenant’s lease terminates in November 2016 and contains no renewal options.
	-2	Lease term and renewal options are reflective of the largest tenant. The other tenants in the building have varying lease expirations from December 2015 to October 2018. No other tenants have renewal options.
	-3	Rent figure is reflective of aggregate rent among all tenants occupying the building.
	-4	Tenants occupying these properties are subject to a gross lease.
	2013 Real Estate Activity
	During the nine months ended September 30, 2013, we acquired five properties and completed an expansion of one property, which are summarized below (dollars in thousands):
	Location		Acquisition/			Square			Lease			Renewal			Total Purchase/		Acquistion		Annualized Straight			Debt Issued
			Expansion Date			Footage			Term			Options			Expansion Price		Expenses		Line Rent
	Egg Harbor Township, NJ			3/28/13			29,257			10 years			1 (5 years)		$	5,650	$	152	$	490		$	3,700
	Clintonville, WI (1)			4/11/13			102,400			15 years			N/A			3,250		N/A		961			—
	Vance, AL			5/8/13			170,000			10 years			2 (5 year options)			13,388		186		1,173			—
	Blaine, MN			5/10/13			92,275			6.9 years			2 (5 year options)			14,450		79		1,475			8,200
	Austin, TX			7/9/13			320,000			8 years			3 (3 year options)			57,000		155		4,641			35,300
	Allen, TX (4)			7/10/13			115,200			11.5 years	(2)		2 (5 year options)	(2)		15,150		81		1,918	(3)		8,900
	Total						829,132								$	108,888	$	653	$	10,658		$	56,100
	-1	Property was originally acquired in November 2005 for $5.3 million. After the expansion completed in April 2013, the total investment in the property is $8.6 million.
	-2	Lease term and renewal options are reflective of the largest tenant. The smaller tenant’s lease terminates in August 2021 and contains 2 (5 year) renewal options.
	-3	Rent figure is reflective of aggregate rent among all tenants occupying the building.
	-4	The larger tenant occupying this property is subject to a gross lease. The smaller tenant occupying this property is subject to a triple net lease.
Fair Value of Acquired Assets and Liabilities Assumed	'
	In accordance with ASC 805, we determined the fair value of the acquired assets and liabilities assumed related to the eight properties acquired during the nine months ended September 30, 2014 as follows (in thousands):
			Land			Building			Tenant			In-place			Leasing		Customer		Above Market			Below Market			Premium on			Total Purchase
									Improvements			Leases			Costs		Relationships		Leases			Leases			Assumed Debt			Price
	Allen, TX		$	874		$	3,509		$	125		$	598		$	273	$	218	$	—		$	—		$	(72	)	$	5,525
	Colleyville, TX			1,277			2,307			117			486			220		181		—			(6	)		(59	)		4,523
	Rancho Cordova, CA			752			5,898			278			473			546		278		—			—			—			8,225
	Coppell, TX			1,448			3,221			128			636			293		230		—			—			(118	)		5,838
	Columbus, OH			990			6,080			1,937			823			719		990		261			—			—			11,800
	Taylor, PA			3,102			24,449			956			6,171			1,452		2,870		—			—			—			39,000
	Aurora, CO			2,882			3,825			92			413			806		282		—			—			—			8,300
	Indianapolis, IN			502			5,334			1,088			1,990			741		732		126			(13	)		—			10,500
			$	11,827		$	54,623		$	4,721		$	11,590		$	5,050	$	5,781	$	387		$	(19	)	$	(249	)	$	93,711
	In accordance with ASC 805, we determined the fair value of acquired assets related to the five properties acquired during the nine months ended September 30, 2013 as follows (in thousands):
			Land			Building			Tenant			In-place			Leasing		Customer		Above Market			Below			Total
									Improvements			Leases			Costs		Relationships		Leases			Market			Purchase
																						Leases			Price
	Egg Harbor Township, NJ		$	1,627		$	2,735		$	282		$	558		$	189	$	259	$	—		$	—		$	5,650
	Vance, AL			457			9,721			808			1,097			678		627		—			—			13,388
	Blaine, MN			1,060			9,347			1,172			1,361			694		816		—			—			14,450
	Austin, TX			2,330			37,207			6,814			6,118			1,906		3,793		—			(1,168	)		57,000
	Allen, TX			2,699			5,758			2,187			1,525			1,146		1,499		336			—			15,150
			$	8,173		$	64,768		$	11,263		$	10,659		$	4,613	$	6,994	$	336		$	(1,168	)	$	105,638
Schedule of Revenue and Earnings Recognized on Properties Acquired	'
	Below is a summary of the total revenue and earnings recognized on the eight properties acquired during the three and nine months ended September 30, 2014 (dollars in thousands):
						For the three months ended September 30,						For the nine months ended September 30,
			Acquisition			2014						2014
	Location		Date			Rental Revenue			Earnings(1)			Rental Revenue			Earnings(1)
	Allen, TX			3/27/14		$	143		$	101		$	293		$	167
	Colleyville, TX			3/27/14			117			83			240			138
	Rancho Cordova, CA			4/22/14			226			104			399			168
	Coppell, TX			5/8/14			150			116			239			139
	Columbus, OH (2)			5/13/14			311			115			479			184
	Taylor, PA			6/9/14			850			395			1,058			493
	Aurora, CO			7/1/14			192			124			192			124
	Indianapolis, IN (2)			9/3/14			116			9			116			9
						$	2,105		$	1,047		$	3,016		$	1,422
	-1	Earnings is calculated as net income exclusive of both interest expense and acquisition related costs that are required to be expensed under ASC 805.
	-2	Rental revenue and earnings is reflective of aggregate rent and operating expenses among all tenants occupying the building.
	Below is a summary of the total revenue and earnings recognized on the five properties acquired during the three and nine months ended September 30, 2013 (dollars in thousands):
						Rental Revenue						Net Income
	Location		Acquisition Date			For the three months			For the nine months			For the three months			For the nine months
						ended September			ended September			ended September			ended September
						30, 2013			30, 2013			30, 2013(1)			30, 2013(1)
	Egg Harbor Township, NJ			3/28/13		$	122		$	250		$	61		$	130
	Vance, AL			5/8/13			293			464			147			218
	Blaine, MN			5/10/13			369			579			161			256
	Austin, TX			7/9/13			1,098			1,098			297			297
	Allen, TX			7/10/13			325			325			136			136
						$	2,207		$	2,716		$	802		$	1,037
	-1	Earnings is calculated as net income less interest expense and acquisition related costs that are required to be expensed under ASC 805.
Pro-Forma Condensed Consolidated Statements of Operations	'
	The following table reflects pro-forma consolidated statements of operations as if the eight properties acquired during the three and nine months ended September 30, 2014 were acquired as of the beginning of the previous period. The pro-forma earnings for the three and nine months ended September 30, 2014 and 2013 were adjusted to assume that acquisition-related costs were incurred as of the beginning of the previous period (dollars in thousands, except per share amounts):
			For the three months ended September 30,						For the nine months ended September 30,
			2014			2013			2014			2013
			(unaudited)						(unaudited)
	Operating Data:
	Total operating revenue		$	19,086		$	19,060		$	58,050		$	56,906
	Total operating expenses			(11,434	)		(10,538	)		(47,780	)(1)		(32,479	)
	Other expenses			(7,283	)		(8,215	)		(21,269	)		(24,347	)
	Net income (loss)			369			307			(10,999	)		80
	Dividends attributable to preferred and senior common stock			(1,160	)		(1,106	)		(3,417	)		(3,274	)
	Net loss attributable to common stockholders		$	(791	)	$	(799	)	$	(14,416	)	$	(3,194	)
	Share and Per Share Data:
	Basic and diluted loss per share of common stock		$	(0.04	)	$	(0.06	)	$	(0.86	)	$	(0.25	)
	Weighted average shares outstanding-basic			17,739,084			14,196,423			16,685,162			12,613,354
	Weighted average shares outstanding-diluted			17,739,084			14,196,423			16,685,162			12,613,354
	-1	$14.2 million relates to the impairment charge recorded in operating expenses during the nine months ended September 30, 2014.
Future Operating Lease Payments from Tenants under Non-Cancelable Leases	'
	Future operating lease payments from tenants under non-cancelable leases, excluding tenant reimbursement of expenses, for the remainder of 2014 and each of the five succeeding fiscal years and thereafter is as follows (dollars in thousands):
	Year		Tenant
			Lease Payments
	Three Months ending December 31, 2014		$	16,929
	2015			68,254
	2016			65,416
	2017			64,689
	2018			64,103
	2019			64,403
	Thereafter			290,868
Carrying Value of Intangible Assets and Accumulated Amortization	'
	The following table summarizes the carrying value of intangible assets and the accumulated amortization for each intangible asset class as of September 30, 2014 and December 31, 2013, respectively (dollars in thousands):
			September 30, 2014						December 31, 2013
			Lease			Accumulated			Lease			Accumulated
			Intangibles			Amortization			Intangibles			Amortization
	In-place leases		$	58,925		$	(18,391	)	$	47,442		$	(15,158	)
	Leasing costs			36,969			(11,419	)		31,339			(9,323	)
	Customer relationships			40,909			(12,351	)		35,739			(10,407	)
			$	136,803		$	(42,161	)	$	114,520		$	(34,888	)
Weighted Average Amortization Period for Intangible Assets Acquired and Liabilities Assumed	'
	The weighted average amortization periods in years for the intangible assets acquired and liabilities assumed during the nine months ended September 30, 2014 and 2013, respectively, were as follows
	Intangible Assets & Liabilities		2014			2013
	In-place leases			10.2			8.8
	Leasing costs			10.2			8.8
	Customer relationships			14.6			13.5
	Above market leases			9.3			8.8
	Below market leases			9.9			7.2
	All intangible assets & liabilities			11.5			9.9
Estimated Aggregate Amortization Expense	'
	The estimated aggregate amortization expense for the remainder of 2014 and for each of the five succeeding fiscal years and thereafter is as follows (dollars in thousands):
	Year		Estimated
			Amortization Expense
	Three Months ending December 31, 2014		$	3,049
	2015			11,931
	2016			11,224
	2017			11,018
	2018			10,719
	2019			10,711
	Thereafter			35,990

Real_Estate_Held_for_Sale_and_1

Real Estate Held for Sale and Impairment Charges (Tables)	9 Months Ended
	Sep. 30, 2014
Real Estate [Abstract]	'
Components of Income from Real Estate and Related Assets Held for Sale	'
	The table below summarizes the components of income from real estate and related assets held for sale for the three and nine months ended September 30, 2014 and September 30, 2013, respectively (dollars in thousands):
		For the three months ended September 30,				For the nine months ended September 30,
		2014		2013		2014		2013
	Operating revenue	$	—	$	292	$	507	$	875
	Operating expense		—		57		40		172
	Income from real estate and related assets held for sale	$	—	$	235	$	467	$	703

Mortgage_Notes_Payable_and_Lin1

Mortgage Notes Payable and Line of Credit (Tables)	9 Months Ended
	Sep. 30, 2014
Debt Disclosure [Abstract]	'
Company's Mortgage Notes Payable and Line of Credit	'
	Our mortgage notes payable and line of credit as of September 30, 2014 and December 31, 2013 are summarized below (dollars in thousands):
							Carrying Value at
			Encumbered				September 30, 2014				December 31, 2013				Stated Interest		Scheduled Maturity
			properties at												Rates at		Dates at September
			September 30,												September 30,		30, 2014
			2014												2014 (4)
	Mortgage and Other Secured Loans:
	Fixed rate mortgage loans			72			$	451,375			$	413,678			-1		-2
	Variable rate mortgage loans			4				8,200				8,200			LIBOR + 2.15% (3)		12/1/16
	Premiums and discounts (net)			N/A				783				724			N/A		N/A
	Total Mortgage Notes Payable			76			$	460,358			$	422,602
	Variable rate Line of Credit			17				45,600				24,400			LIBOR + 2.75% (3)		8/1/17
	Total Mortgage Notes Payable and Line of Credit			93			$	505,958			$	447,002
	-1	Interest rates on our fixed rate mortgage notes payable vary from 4.04% to 6.80%.
	-2	We have 41 mortgage notes payable with maturity dates ranging from 9/1/2015 through 1/6/2039.
	-3	At September 30, 2014, one month LIBOR was approximately 0.15%.
	-4	The weighted average interest rate on all debt outstanding at September 30, 2014, was approximately 5.13%.
	N/A - Not Applicable
Summary of Long-Term Mortgages	'
	During the nine months ended September 30, 2014, we assumed two long-term mortgages, collateralized by three properties, and issued three long-term mortgages, collateralized by three properties, which are summarized below (dollars in thousands):
	Date of Issuance		Issuing Bank		Debt Issued				Interest Rate				Maturity Date
	3/27/14		Wells Fargo N.A.		$	6,330				5.58	%			2/1/16
	4/22/14		Keybank N.A.			4,935				4.9	%			5/1/24
	5/8/14		Wells Fargo N.A.			3,816				6.25	%			6/1/16
	6/9/14		Prudential Mortgage			22,600				4.23	%			7/1/19
			Capital Company
	9/3/14		Everbank			6,100				4.4	%			10/1/24
					$	43,781
Principal Payments of Mortgage Notes Payable	'
	Scheduled principal payments of mortgage notes payable for the remainder of 2014, and each of the five succeeding fiscal years and thereafter are as follows (dollars in thousands):
	Year		Scheduled Principal
			Payments
	Three Months ending December 31, 2014		$	18,898
	2015			42,683
	2016			98,720
	2017			67,315
	2018			19,909
	2019			34,570
	Thereafter			177,480
			$	459,575
Summary of Interest Rate Cap Agreement	'
	The following table summarizes the key terms of each interest rate cap agreement (dollars in thousands):
															As of September 30,					As of December 31,
			Notional												2014					2013
	Interest Rate Cap		Amount				LIBOR Cap				Maturity Date				Cost			Fair Value		Cost		Fair Value
	26-Nov-13		$	8,200				3	%			December 1, 2016			$	31		$	7	$	31	$	22

Commitments_and_Contingencies_

Commitments and Contingencies (Tables)	9 Months Ended
	Sep. 30, 2014
Future Minimum Rental Payments Due under Terms of Leases	'
	We are obligated as lessee under three ground leases. Future minimum rental payments due under the terms of these leases for the remainder of 2014 and each of the five succeeding years and thereafter, are as follows (dollars in thousands):
				For the year ended December 31,
	Location	Lease End Date		2014		2015		2016		2017		2018		2019		Thereafter
	Tulsa, OK		21-Apr	$	38	$	153	$	153	$	153	$	153	$	153	$	229
	Dartmouth, MA		May-36		44		174		174		174		174		174		3,300
	Springfield, MA		Feb-30		21		86		86		89		90		90		972
				$	103	$	413	$	413	$	416	$	417	$	417	$	4,501
Tenant Improvements [Member]	'
Future Tenant Improvement Payments Due on Properties	'
	The following table reflects unconditional purchase obligations which have not been recognized on the balance sheet as of September 30, 2014. Future tenant improvement payments due on these properties for the remainder of 2014 and each of the five succeeding years and thereafter, are as follows (dollars in thousands):
				For the year ended December 31,
	Location	Lease End Date		2014		2015		2016		2017		2018		2019		Thereafter
	Burnsville, MN		23-Jan	$	53	$	1,000	$	—	$	—	$	—	$	—	$	—
				$	53	$	1,000	$	—	$	—	$	—	$	—	$	—

Stockholders_Equity_Tables

Stockholders' Equity (Tables)	9 Months Ended
	Sep. 30, 2014
Equity [Abstract]	'
Summary of Changes in Stockholders' Equity	'
	The following table summarizes the changes in our stockholders’ equity for the nine months ended September 30, 2014 (dollars in thousands):
														Distributions in
								Additional			Notes			Excess of			Total
		Preferred		Senior Common		Common		Paid in			Receivable			Accumulated			Stockholders’
		Stock		Stock		Stock		Capital			from Employees			Earnings			Equity
	Balance at December 31, 2013	$	2	$	—	$	16	$	298,751		$	(375	)	$	(115,248	)	$	183,146
	Issuance of senior common stock and common stock, net		—		1		2		40,332			—			—			40,335
	Distributions declared to common, senior common and preferred stockholders		—		—		—		—			—			(22,219	)		(22,219	)
	Net loss		—		—		—		—			—			(12,066	)		(12,066	)
	Balance at September 30, 2014	$	2	$	1	$	18	$	339,083		$	(375	)	$	(149,533	)	$	189,196
Dividends Declared	'
	Our Board of Directors declared the following distributions per share for the three and nine months ended September 30, 2014 and 2013:
		For the three months ended September 30,				For the nine months ended September 30,
		2014		2013		2014		2013
	Common Stock	$	0.375	$	0.375	$	1.125	$	1.125
	Senior Common Stock		0.2625		0.2625		0.7875		0.7875
	Series A Preferred Stock		0.4843749		0.4843749		1.4531247		1.4531247
	Series B Preferred Stock		0.4688		0.4688		1.4063		1.4063
	Series C Preferred Stock		0.4453		0.4453		1.3359		1.3359
Summary of Outstanding Note Receivable from an Employee for the Exercise of Stock Options	'
	The following table is a summary of the outstanding note receivable from an employee of the Adviser for the exercise of stock options (dollars in thousands):
	Date Issued	Outstanding Balance		Outstanding Balance		Maturity Date		Interest Rate
		of Employee Loan at		of Employee Loan at		of Note		on Note
		September 30, 2014		December 31, 2013
	Nov-06	$	375	$	375		Nov 2015		8.15	%

Subsequent_Events_Tables

Subsequent Events (Tables)	9 Months Ended
	Sep. 30, 2014
Subsequent Events [Abstract]	'
Monthly Distributions Declared by Company's Board of Directors	'
	On October 7, 2014, our Board of Directors declared the following monthly distributions:
	Record Date	Payment Date	Common Stock		Series A Preferred		Series B Preferred		Series C Preferred
			Distributions per Share		Distributions per Share		Distributions per Share		Distributions per Share
	October 22, 2014	31-Oct-14	$	0.125	$	0.1614583	$	0.15625	$	0.1484375
	November 17, 2014	November 26, 2014		0.125		0.1614583		0.15625		0.1484375
	December 19, 2014	31-Dec-14		0.125		0.1614583		0.15625		0.1484375
	Total		$	0.375	$	0.4843749	$	0.46875	$	0.4453125
	Senior Common Stock Distributions
	Payable to the	Payment Date	Distribution per Share
	Holders of Record
	During the Month of:
	October	November 7, 2014	$	0.0875
	November	December 5, 2014		0.0875
	December	8-Jan-15		0.0875
	Total		$	0.2625

Organization_Basis_of_Presenta2

Organization, Basis of Presentation and Significant Accounting Policies - Additional Information (Detail) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
			Subsidiary
Organization And Significant Accounting Policies [Line Items]	'	'	'	'
Number of subsidiaries interest owned in general and limited partnership	'	'	2	'
Non-qualifying income related to real estate portfolio	'	'	$0	'
Adjusted net income due to error correction	300,000	'	0	'
Amortization related to below-market lease	200,000	200,000	500,000	400,000
Total amortization expense related to intangible assets	2,600,000	2,000,000	7,200,000	5,200,000
Payments of deferred financing costs	100,000	1,300,000	711,000	1,484,000
Total amortization expense related to deferred financing costs included in interest expense	400,000	600,000	1,209,000	1,410,000
Liabilities accrued	'	'	200,000	0
Expenses recorded to general and administrative expense	40,000	30,000	100,000	100,000
Aggregate undiscounted obligation on properties	9,500,000	'	9,500,000	'
Expected payment to be made in next twelve months	0	'	0	'
Expected payment to be made in second year	0	'	0	'
Expected payment to be made in third year	0	'	0	'
Expected payment to be made in fourth year	0	'	0	'
Expected payment to be made in fifth year	0	'	0	'
Real Estate [Member]	'	'	'	'
Organization And Significant Accounting Policies [Line Items]	'	'	'	'
Real estate depreciation expense	4,800,000	4,200,000	13,800,000	11,200,000
Minimum [Member]	'	'	'	'
Organization And Significant Accounting Policies [Line Items]	'	'	'	'
Expected lease up period for estimating carrying costs	'	'	'9 months	'
Remaining term of in-place leases and unamortized lease	'	'	'10 years	'
Percentage of discount rate for calculating undiscounted obligation	'	'	2.50%	'
Maximum [Member]	'	'	'	'
Organization And Significant Accounting Policies [Line Items]	'	'	'	'
Expected lease up period for estimating carrying costs	'	'	'18 months	'
Remaining term of in-place leases and unamortized lease	'	'	'15 years	'
Percentage of discount rate for calculating undiscounted obligation	'	'	7.60%	'
Above Market Leases [Member]	'	'	'	'
Organization And Significant Accounting Policies [Line Items]	'	'	'	'
Amortization related to above-market lease	$100,000	$100,000	$200,000	$200,000
Building and Improvements [Member]	'	'	'	'
Organization And Significant Accounting Policies [Line Items]	'	'	'	'
Estimated useful life	'	'	'39 years	'
Equipment and Fixtures [Member] | Minimum [Member]	'	'	'	'
Organization And Significant Accounting Policies [Line Items]	'	'	'	'
Estimated useful life	'	'	'5 years	'
Equipment and Fixtures [Member] | Maximum [Member]	'	'	'	'
Organization And Significant Accounting Policies [Line Items]	'	'	'	'
Estimated useful life	'	'	'20 years	'
Gladstone Commercial Advisers, Inc. [Member]	'	'	'	'
Organization And Significant Accounting Policies [Line Items]	'	'	'	'
Company ownership percentage of voting securities of Commercial Advisers	'	'	100.00%	'
GCLP Business Trust I [Member]	'	'	'	'
Organization And Significant Accounting Policies [Line Items]	'	'	'	'
Percentage of limited partnership interest transferred to business unit	'	'	99.00%	'
Number of trust shares exchanged for limited partnership interest	'	'	100	'
Subsidiary and business trust of the Company, formed under the laws of the Commonwealth of Massachusetts, date	'	'	28-Dec-05	'
GCLP Business Trust II [Member]	'	'	'	'
Organization And Significant Accounting Policies [Line Items]	'	'	'	'
Percentage of limited partnership interest transferred to business unit	'	'	1.00%	'
Number of trust shares exchanged for general partnership interest	'	'	100	'
Subsidiary and business trust of the Company, formed under the laws of the Commonwealth of Massachusetts, date	'	'	28-Dec-05	'

RelatedParty_Transactions_Addi

Related-Party Transactions - Additional Information (Detail) (USD $)	3 Months Ended				9 Months Ended
	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013		Dec. 31, 2013
Related Party Transaction [Line Items]	'		'		'		'		'
Due to Adviser and Administrator	$1,688,000	[1]	'		$1,688,000	[1]	'		$1,360,000	[1]
Annual base management fee, in percentage of stockholders' equity, in excess of recorded value of preferred stock	'		'		2.00%		'		'
Base management fee	741,000	[1]	559,000	[1]	2,031,000	[1]	1,363,000	[1]	'
Pre-incentive quarterly fee FFO in percentage of common stockholders' equity that will reward the Adviser	'		'		1.75%		'		'
Pre-incentive annual fee FFO in percentage of common stockholders' equity that will reward the Adviser	'		'		7.00%		'		'
Amount to be paid to Adviser in percentage of pre-incentive fee condition one	'		'		100.00%		'		'
Pre-incentive fee in percentage of common stockholders' equity that awards adviser hundred percent of amount of pre-incentive fee, maximum percentage	'		'		2.19%		'		'
Amount to be paid to Adviser in percentage of pre-incentive fee condition two	'		'		20.00%		'		'
Pre-incentive fee in percentage of common stockholders' equity that awards the adviser 20% of the amount of the pre-incentive fee, minimum percentage	'		'		2.19%		'		'
Incentive fee	1,538,000	[1]	1,138,000	[1]	4,305,000	[1]	3,001,000	[1]	'
Credits related to unconditional and irrevocable voluntary waivers issued by the Adviser	851,000	[1]	989,000	[1]	3,013,000	[1]	2,491,000	[1]	'
Related-party transactions incentive fee, net	700,000		100,000		1,300,000		500,000		'
Administration fee	260,000	[1]	274,000	[1]	1,238,000	[1]	1,004,000	[1]	'
Dealer manager fee in percentage of gross proceeds of shares of senior common stock sold	'		'		7.00%		'		'
Sales commission fee in percentage of gross proceeds of shares of senior common stock sold	'		'		3.00%		'		'
Agreement termination date	'		'		31-Aug-15		'		'
Fees paid	20,000		40,000		100,000		40,000		'
Minimum [Member]	'		'		'		'		'
Related Party Transaction [Line Items]	'		'		'		'		'
Percentage of the amount of the mortgage	'		'		0.50%		'		'
Maximum [Member]	'		'		'		'		'
Related Party Transaction [Line Items]	'		'		'		'		'
Percentage of the amount of the mortgage	'		'		1.00%		'		'
Dealer Manager [Member]	'		'		'		'		'
Related Party Transaction [Line Items]	'		'		'		'		'
Payments made to the Dealer Manager pursuant to Dealer Manager Agreement	$300,000		$50,000		$400,000		$200,000		'
Agreement termination date	'		'		28-Mar-15		'		'
Agreement termination on senior common stock shares issued	'		'		3,000,000		'		'
[1]	Refer to Note 2 "Related-Party Transactions"

Loss_Per_Share_of_Common_Stock2

Loss Per Share of Common Stock - Basic and Diluted Loss Per Share of Common Stock (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, except Share data, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Calculation of basic loss per share of common stock:	'	'	'	'
Net loss attributable to common stockholders	($931)	($797)	($15,483)	($2,080)
Denominator for basic weighted average shares of common stock	17,739,084	14,196,423	16,685,162	12,613,354
Basic loss per share of common stock	($0.05)	($0.06)	($0.93)	($0.16)
Calculation of diluted loss per share of common stock:	'	'	'	'
Net loss attributable to common stockholders	-931	-797	-15,483	-2,080
Add: Income impact of assumed conversion of senior common stock	'	'	'	'
Net loss attributable to common stockholders plus assumed conversions	($931)	($797)	($15,483)	($2,080)
Denominator for basic weighted average shares of common stock	17,739,084	14,196,423	16,685,162	12,613,354
Effect of convertible senior common stock	'	'	'	'
Denominator for diluted weighted average shares of common stock	17,739,084	14,196,423	16,685,162	12,613,354
Diluted loss per share of common stock	($0.05)	($0.06)	($0.93)	($0.16)

Loss_Per_Share_of_Common_Stock3

Loss Per Share of Common Stock - Basic and Diluted Loss Per Share of Common Stock (Parenthetical) (Detail)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Earnings Per Share [Abstract]	'	'	'	'
Anti-dilutive convertible senior common shares excluded from calculation of diluted earnings per share	429,673	257,429	362,162	217,010

Real_Estate_and_Intangible_Ass2

Real Estate and Intangible Assets - Company's Investments in Real Estate (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Real estate:	'	'
Land	$86,737	$79,153
Building and improvements	573,149	527,230
Tenant improvements	40,688	35,970
Accumulated depreciation	-93,401	-81,241
Total real estate, net	$607,173	$561,112

Real_Estate_and_Intangible_Ass3

Real Estate and Intangible Assets - Additional Information (Detail) (USD $)

0 Months Ended

9 Months Ended

0 Months Ended

9 Months Ended

0 Months Ended

9 Months Ended

9 Months Ended

Jul. 07, 2014

Jun. 11, 2014

Sep. 30, 2014

Sep. 30, 2013

Sep. 30, 2014

Sep. 30, 2014

Jun. 11, 2014

Sep. 30, 2014

6-May-14

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2013

Property

Concord Township, Ohio [Member]

Newburyport, Massachusetts [Member]

Burnsville, MN [Member]

Burnsville, MN [Member]

Austin, Texas [Member]

Austin, Texas [Member]

San Antonio, Texas [Member]

2014 Real Estate Activity [Member]

2013 Real Estate Activity [Member]

Property

Property

Real Estate Properties [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of properties acquired

'

'

8

'

'

'

'

'

'

'

'

8

5

Number of properties expanded

'

'

'

'

'

'

'

'

'

'

'

'

1

Lease expiration date

'

'

'

'

'

30-Apr-15

'

'

'

'

'

'

'

Option to extend lease term

'

'

'

'

'

'

'

'

'8 years

'

'

'

'

Original lease expiration

'2015-03

'

'

'

'

'

'

'

'2015-06

'

'

'

'

Extended lease expiration

'2020-03

'

'

'

'

'

'

'

'2022-06

'

'

'

'

Amount of annualized straight line rents over the life of the lease

'

'

'

'

'

'

'

'

$700,000

'

'

'

'

Leasing commissions paid

200,000

'

898,000

1,008,000

'

'

'

500,000

'

200,000

'

'

'

Tenant improvements payable

'

'

3,300,000

'

'

'

'

'

'

1,300,000

'

'

'

Extended additional period of lease

'

'3 years

'

'

'

'

'8 years

'

'

'

'

'

'

Extended lease expiration date

'

'

'

'

'

'

'2023-01

'

'

'

'

'

'

Lease expiration period, month and year

'

'

'2016-11

'2021-08

'

'

'2015-06

'

'

'

'

'

'

Annualized straight line rent escalations

'

'

'

'

'

'

1,000,000

'

'

'

'

'

'

Annual increase in lease rental

'

14.00%

'

'

'

'

'

'

'

'

'

'

'

Annualized straight line rent escalations

600,000

'

'

'

'

'

'

'

'

'

'

'

'

Amount paid for tenant improvements

$900,000

'

'

'

'

'

'

'

'

'

'

'

'

Modified lease payment description

'

'

'

'

'The lease covering this property was adjusted to defer a portion of rental payments covering the period August 2014 through December 2014. The tenant will repay the deferred rent balance monthly during calendar year 2015.

'

'

'

'

'The leases covering these respective properties were adjusted to defer rental payments covering the period September 1, 2014 through November 30, 2014.

'The leases covering these respective properties were adjusted to defer rental payments covering the period September 1, 2014 through November 30, 2014.

'

'

Real_Estate_and_Intangible_Ass4

Real Estate and Intangible Assets - Summary of Properties Acquired (Detail) (USD $)	1 Months Ended	9 Months Ended
In Thousands, unless otherwise specified	Nov. 30, 2005	Sep. 30, 2014	Sep. 30, 2013
		sqft	sqft
			Option
Business Acquisition [Line Items]	'	'	'
Square Footage	'	1,406,054	829,132
Renewal options	'	'	2
Renewal options period	'	'	'5 years
Total Purchase Price	$5,300	$93,711	$108,888
Acquisition Expenses	'	1,114	653
Annualized Straight Line Rent	'	9,490	10,658
Debt Issued	'	43,781	56,100
Allen, TX [Member]	'	'	'
Business Acquisition [Line Items]	'	'	'
Acquisition Date	'	27-Mar-14	10-Jul-13
Square Footage	'	21,154	115,200
Lease Term	'	'12 years	'11 years 6 months
Renewal options	'	4	2
Renewal options period	'	'5 years	'5 years
Total Purchase Price	'	5,525	15,150
Acquisition Expenses	'	33	81
Annualized Straight Line Rent	'	570	1,918
Debt Issued	'	3,481	8,900
Colleyville, TX [Member]	'	'	'
Business Acquisition [Line Items]	'	'	'
Acquisition Date	'	27-Mar-14	'
Square Footage	'	20,355	'
Lease Term	'	'12 years	'
Renewal options	'	4	'
Renewal options period	'	'5 years	'
Total Purchase Price	'	4,523	'
Acquisition Expenses	'	33	'
Annualized Straight Line Rent	'	467	'
Debt Issued	'	2,849	'
Rancho Cordova, CA [Member]	'	'	'
Business Acquisition [Line Items]	'	'	'
Acquisition Date	'	22-Apr-14	'
Square Footage	'	61,358	'
Lease Term	'	'10 years	'
Renewal options	'	1	'
Renewal options period	'	'5 years	'
Total Purchase Price	'	8,225	'
Acquisition Expenses	'	73	'
Annualized Straight Line Rent	'	902	'
Debt Issued	'	4,935	'
Coppell, TX [Member]	'	'	'
Business Acquisition [Line Items]	'	'	'
Acquisition Date	'	8-May-14	'
Square Footage	'	21,171	'
Lease Term	'	'12 years	'
Renewal options	'	4	'
Renewal options period	'	'5 years	'
Total Purchase Price	'	5,838	'
Acquisition Expenses	'	26	'
Annualized Straight Line Rent	'	601	'
Debt Issued	'	3,816	'
Columbus, OH [Member]	'	'	'
Business Acquisition [Line Items]	'	'	'
Acquisition Date	'	13-May-14	'
Square Footage	'	114,786	'
Lease Term	'	'9 years 6 months	'
Total Purchase Price	'	11,800	'
Acquisition Expenses	'	70	'
Annualized Straight Line Rent	'	1,278	'
Taylor, PA [Member]	'	'	'
Business Acquisition [Line Items]	'	'	'
Acquisition Date	'	9-Jun-14	'
Square Footage	'	955,935	'
Lease Term	'	'10 years	'
Renewal options	'	4	'
Renewal options period	'	'5 years	'
Total Purchase Price	'	39,000	'
Acquisition Expenses	'	730	'
Annualized Straight Line Rent	'	3,400	'
Debt Issued	'	22,600	'
Aurora, CO [Member]	'	'	'
Business Acquisition [Line Items]	'	'	'
Acquisition Date	'	1-Jul-14	'
Square Footage	'	124,800	'
Lease Term	'	'15 years	'
Renewal options	'	2	'
Renewal options period	'	'5 years	'
Total Purchase Price	'	8,300	'
Acquisition Expenses	'	91	'
Annualized Straight Line Rent	'	768	'
Indianapolis, IN [Member]	'	'	'
Business Acquisition [Line Items]	'	'	'
Acquisition Date	'	3-Sep-14	'
Square Footage	'	86,495	'
Lease Term	'	'11 years 6 months	'
Renewal options	'	2	'
Renewal options period	'	'5 years	'
Total Purchase Price	'	10,500	'
Acquisition Expenses	'	58	'
Annualized Straight Line Rent	'	1,504	'
Debt Issued	'	6,100	'
Egg Harbor Township, NJ [Member]	'	'	'
Business Acquisition [Line Items]	'	'	'
Acquisition Date	'	'	28-Mar-13
Square Footage	'	'	29,257
Lease Term	'	'	'10 years
Renewal options	'	'	1
Renewal options period	'	'	'5 years
Total Purchase Price	'	'	5,650
Acquisition Expenses	'	'	152
Annualized Straight Line Rent	'	'	490
Debt Issued	'	'	3,700
Clintonville, WI [Member]	'	'	'
Business Acquisition [Line Items]	'	'	'
Acquisition Date	'	'	11-Apr-13
Square Footage	'	'	102,400
Lease Term	'	'	'15 years
Total Purchase Price	'	'	3,250
Annualized Straight Line Rent	'	'	961
Vance, AL [Member]	'	'	'
Business Acquisition [Line Items]	'	'	'
Acquisition Date	'	'	8-May-13
Square Footage	'	'	170,000
Lease Term	'	'	'10 years
Renewal options	'	'	2
Renewal options period	'	'	'5 years
Total Purchase Price	'	'	13,388
Acquisition Expenses	'	'	186
Annualized Straight Line Rent	'	'	1,173
Blaine, MN [Member]	'	'	'
Business Acquisition [Line Items]	'	'	'
Acquisition Date	'	'	10-May-13
Square Footage	'	'	92,275
Lease Term	'	'	'6 years 10 months 24 days
Renewal options	'	'	2
Renewal options period	'	'	'5 years
Total Purchase Price	'	'	14,450
Acquisition Expenses	'	'	79
Annualized Straight Line Rent	'	'	1,475
Debt Issued	'	'	8,200
Austin, Texas [Member]	'	'	'
Business Acquisition [Line Items]	'	'	'
Acquisition Date	'	'	9-Jul-13
Square Footage	'	'	320,000
Lease Term	'	'	'8 years
Renewal options	'	'	3
Renewal options period	'	'	'3 years
Total Purchase Price	'	'	57,000
Acquisition Expenses	'	'	155
Annualized Straight Line Rent	'	'	4,641
Debt Issued	'	'	$35,300

Real_Estate_and_Intangible_Ass5

Real Estate and Intangible Assets - Summary of Properties Acquired (Parenthetical) (Detail) (USD $)	1 Months Ended	9 Months Ended
In Thousands, unless otherwise specified	Nov. 30, 2005	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013	Apr. 30, 2013
			Option
Real Estate [Abstract]	'	'	'	'	'
Lease renewal terms description	'	'The other tenants in the building have varying lease expirations from December 2015 to October 2018. No other tenants have renewal options.	'	'	'
Total Purchase Price	$5,300	$93,711	$108,888	'	'
Total investment in property	'	$700,574	'	$642,353	$8,600
Renewal options period	'	'	'5 years	'	'
Renewal options	'	'	2	'	'
Lease expiration year	'	'2016-11	'2021-08	'	'

Real_Estate_and_Intangible_Ass6

Real Estate and Intangible Assets - Fair Value of Acquired Assets and Liabilities Assumed (Detail) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013
Business Acquisition [Line Items]	'	'
Total Purchase Price	$93,711	$105,638
Customer Relationships [Member]	'	'
Business Acquisition [Line Items]	'	'
Fair value of acquired assets related to the properties acquired	5,781	6,994
Above Market Leases [Member]	'	'
Business Acquisition [Line Items]	'	'
Fair value of acquired assets related to the properties acquired	387	336
Below Market Leases [Member]	'	'
Business Acquisition [Line Items]	'	'
Fair value of acquired assets related to the properties acquired	-19	-1,168
Discount on Assumed Debt [Member]	'	'
Business Acquisition [Line Items]	'	'
Fair value of acquired assets related to the properties acquired	-249	'
Allen, TX [Member]	'	'
Business Acquisition [Line Items]	'	'
Total Purchase Price	5,525	15,150
Allen, TX [Member] | Customer Relationships [Member]	'	'
Business Acquisition [Line Items]	'	'
Fair value of acquired assets related to the properties acquired	218	1,499
Allen, TX [Member] | Above Market Leases [Member]	'	'
Business Acquisition [Line Items]	'	'
Fair value of acquired assets related to the properties acquired	'	336
Allen, TX [Member] | Discount on Assumed Debt [Member]	'	'
Business Acquisition [Line Items]	'	'
Fair value of acquired assets related to the properties acquired	-72	'
Colleyville, TX [Member]	'	'
Business Acquisition [Line Items]	'	'
Total Purchase Price	4,523	'
Colleyville, TX [Member] | Customer Relationships [Member]	'	'
Business Acquisition [Line Items]	'	'
Fair value of acquired assets related to the properties acquired	181	'
Colleyville, TX [Member] | Below Market Leases [Member]	'	'
Business Acquisition [Line Items]	'	'
Fair value of acquired assets related to the properties acquired	-6	'
Colleyville, TX [Member] | Discount on Assumed Debt [Member]	'	'
Business Acquisition [Line Items]	'	'
Fair value of acquired assets related to the properties acquired	-59	'
Rancho Cordova, CA [Member]	'	'
Business Acquisition [Line Items]	'	'
Total Purchase Price	8,225	'
Rancho Cordova, CA [Member] | Customer Relationships [Member]	'	'
Business Acquisition [Line Items]	'	'
Fair value of acquired assets related to the properties acquired	278	'
Coppell, TX [Member]	'	'
Business Acquisition [Line Items]	'	'
Total Purchase Price	5,838	'
Coppell, TX [Member] | Customer Relationships [Member]	'	'
Business Acquisition [Line Items]	'	'
Fair value of acquired assets related to the properties acquired	230	'
Coppell, TX [Member] | Discount on Assumed Debt [Member]	'	'
Business Acquisition [Line Items]	'	'
Fair value of acquired assets related to the properties acquired	-118	'
Columbus, OH [Member]	'	'
Business Acquisition [Line Items]	'	'
Total Purchase Price	11,800	'
Columbus, OH [Member] | Customer Relationships [Member]	'	'
Business Acquisition [Line Items]	'	'
Fair value of acquired assets related to the properties acquired	990	'
Columbus, OH [Member] | Above Market Leases [Member]	'	'
Business Acquisition [Line Items]	'	'
Fair value of acquired assets related to the properties acquired	261	'
Taylor, PA [Member]	'	'
Business Acquisition [Line Items]	'	'
Total Purchase Price	39,000	'
Taylor, PA [Member] | Customer Relationships [Member]	'	'
Business Acquisition [Line Items]	'	'
Fair value of acquired assets related to the properties acquired	2,870	'
Aurora, CO [Member]	'	'
Business Acquisition [Line Items]	'	'
Total Purchase Price	8,300	'
Aurora, CO [Member] | Customer Relationships [Member]	'	'
Business Acquisition [Line Items]	'	'
Fair value of acquired assets related to the properties acquired	282	'
Indianapolis, IN [Member]	'	'
Business Acquisition [Line Items]	'	'
Total Purchase Price	10,500	'
Indianapolis, IN [Member] | Customer Relationships [Member]	'	'
Business Acquisition [Line Items]	'	'
Fair value of acquired assets related to the properties acquired	732	'
Indianapolis, IN [Member] | Above Market Leases [Member]	'	'
Business Acquisition [Line Items]	'	'
Fair value of acquired assets related to the properties acquired	126	'
Indianapolis, IN [Member] | Below Market Leases [Member]	'	'
Business Acquisition [Line Items]	'	'
Fair value of acquired assets related to the properties acquired	-13	'
Egg Harbor Township, NJ [Member]	'	'
Business Acquisition [Line Items]	'	'
Total Purchase Price	'	5,650
Egg Harbor Township, NJ [Member] | Customer Relationships [Member]	'	'
Business Acquisition [Line Items]	'	'
Fair value of acquired assets related to the properties acquired	'	259
Vance, AL [Member]	'	'
Business Acquisition [Line Items]	'	'
Total Purchase Price	'	13,388
Vance, AL [Member] | Customer Relationships [Member]	'	'
Business Acquisition [Line Items]	'	'
Fair value of acquired assets related to the properties acquired	'	627
Blaine, MN [Member]	'	'
Business Acquisition [Line Items]	'	'
Total Purchase Price	'	14,450
Blaine, MN [Member] | Customer Relationships [Member]	'	'
Business Acquisition [Line Items]	'	'
Fair value of acquired assets related to the properties acquired	'	816
Austin, Texas [Member]	'	'
Business Acquisition [Line Items]	'	'
Total Purchase Price	'	57,000
Austin, Texas [Member] | Customer Relationships [Member]	'	'
Business Acquisition [Line Items]	'	'
Fair value of acquired assets related to the properties acquired	'	3,793
Austin, Texas [Member] | Below Market Leases [Member]	'	'
Business Acquisition [Line Items]	'	'
Fair value of acquired assets related to the properties acquired	'	-1,168
Land [Member]	'	'
Business Acquisition [Line Items]	'	'
Fair value of acquired assets related to the properties acquired	11,827	8,173
Land [Member] | Allen, TX [Member]	'	'
Business Acquisition [Line Items]	'	'
Fair value of acquired assets related to the properties acquired	874	2,699
Land [Member] | Colleyville, TX [Member]	'	'
Business Acquisition [Line Items]	'	'
Fair value of acquired assets related to the properties acquired	1,277	'
Land [Member] | Rancho Cordova, CA [Member]	'	'
Business Acquisition [Line Items]	'	'
Fair value of acquired assets related to the properties acquired	752	'
Land [Member] | Coppell, TX [Member]	'	'
Business Acquisition [Line Items]	'	'
Fair value of acquired assets related to the properties acquired	1,448	'
Land [Member] | Columbus, OH [Member]	'	'
Business Acquisition [Line Items]	'	'
Fair value of acquired assets related to the properties acquired	990	'
Land [Member] | Taylor, PA [Member]	'	'
Business Acquisition [Line Items]	'	'
Fair value of acquired assets related to the properties acquired	3,102	'
Land [Member] | Aurora, CO [Member]	'	'
Business Acquisition [Line Items]	'	'
Fair value of acquired assets related to the properties acquired	2,882	'
Land [Member] | Indianapolis, IN [Member]	'	'
Business Acquisition [Line Items]	'	'
Fair value of acquired assets related to the properties acquired	502	'
Land [Member] | Egg Harbor Township, NJ [Member]	'	'
Business Acquisition [Line Items]	'	'
Fair value of acquired assets related to the properties acquired	'	1,627
Land [Member] | Vance, AL [Member]	'	'
Business Acquisition [Line Items]	'	'
Fair value of acquired assets related to the properties acquired	'	457
Land [Member] | Blaine, MN [Member]	'	'
Business Acquisition [Line Items]	'	'
Fair value of acquired assets related to the properties acquired	'	1,060
Land [Member] | Austin, Texas [Member]	'	'
Business Acquisition [Line Items]	'	'
Fair value of acquired assets related to the properties acquired	'	2,330
Building [Member]	'	'
Business Acquisition [Line Items]	'	'
Fair value of acquired assets related to the properties acquired	54,623	64,768
Building [Member] | Allen, TX [Member]	'	'
Business Acquisition [Line Items]	'	'
Fair value of acquired assets related to the properties acquired	3,509	5,758
Building [Member] | Colleyville, TX [Member]	'	'
Business Acquisition [Line Items]	'	'
Fair value of acquired assets related to the properties acquired	2,307	'
Building [Member] | Rancho Cordova, CA [Member]	'	'
Business Acquisition [Line Items]	'	'
Fair value of acquired assets related to the properties acquired	5,898	'
Building [Member] | Coppell, TX [Member]	'	'
Business Acquisition [Line Items]	'	'
Fair value of acquired assets related to the properties acquired	3,221	'
Building [Member] | Columbus, OH [Member]	'	'
Business Acquisition [Line Items]	'	'
Fair value of acquired assets related to the properties acquired	6,080	'
Building [Member] | Taylor, PA [Member]	'	'
Business Acquisition [Line Items]	'	'
Fair value of acquired assets related to the properties acquired	24,449	'
Building [Member] | Aurora, CO [Member]	'	'
Business Acquisition [Line Items]	'	'
Fair value of acquired assets related to the properties acquired	3,825	'
Building [Member] | Indianapolis, IN [Member]	'	'
Business Acquisition [Line Items]	'	'
Fair value of acquired assets related to the properties acquired	5,334	'
Building [Member] | Egg Harbor Township, NJ [Member]	'	'
Business Acquisition [Line Items]	'	'
Fair value of acquired assets related to the properties acquired	'	2,735
Building [Member] | Vance, AL [Member]	'	'
Business Acquisition [Line Items]	'	'
Fair value of acquired assets related to the properties acquired	'	9,721
Building [Member] | Blaine, MN [Member]	'	'
Business Acquisition [Line Items]	'	'
Fair value of acquired assets related to the properties acquired	'	9,347
Building [Member] | Austin, Texas [Member]	'	'
Business Acquisition [Line Items]	'	'
Fair value of acquired assets related to the properties acquired	'	37,207
Tenant Improvements [Member]	'	'
Business Acquisition [Line Items]	'	'
Fair value of acquired assets related to the properties acquired	4,721	11,263
Tenant Improvements [Member] | Allen, TX [Member]	'	'
Business Acquisition [Line Items]	'	'
Fair value of acquired assets related to the properties acquired	125	2,187
Tenant Improvements [Member] | Colleyville, TX [Member]	'	'
Business Acquisition [Line Items]	'	'
Fair value of acquired assets related to the properties acquired	117	'
Tenant Improvements [Member] | Rancho Cordova, CA [Member]	'	'
Business Acquisition [Line Items]	'	'
Fair value of acquired assets related to the properties acquired	278	'
Tenant Improvements [Member] | Coppell, TX [Member]	'	'
Business Acquisition [Line Items]	'	'
Fair value of acquired assets related to the properties acquired	128	'
Tenant Improvements [Member] | Columbus, OH [Member]	'	'
Business Acquisition [Line Items]	'	'
Fair value of acquired assets related to the properties acquired	1,937	'
Tenant Improvements [Member] | Taylor, PA [Member]	'	'
Business Acquisition [Line Items]	'	'
Fair value of acquired assets related to the properties acquired	956	'
Tenant Improvements [Member] | Aurora, CO [Member]	'	'
Business Acquisition [Line Items]	'	'
Fair value of acquired assets related to the properties acquired	92	'
Tenant Improvements [Member] | Indianapolis, IN [Member]	'	'
Business Acquisition [Line Items]	'	'
Fair value of acquired assets related to the properties acquired	1,088	'
Tenant Improvements [Member] | Egg Harbor Township, NJ [Member]	'	'
Business Acquisition [Line Items]	'	'
Fair value of acquired assets related to the properties acquired	'	282
Tenant Improvements [Member] | Vance, AL [Member]	'	'
Business Acquisition [Line Items]	'	'
Fair value of acquired assets related to the properties acquired	'	808
Tenant Improvements [Member] | Blaine, MN [Member]	'	'
Business Acquisition [Line Items]	'	'
Fair value of acquired assets related to the properties acquired	'	1,172
Tenant Improvements [Member] | Austin, Texas [Member]	'	'
Business Acquisition [Line Items]	'	'
Fair value of acquired assets related to the properties acquired	'	6,814
In-Place Leases [Member]	'	'
Business Acquisition [Line Items]	'	'
Fair value of acquired assets related to the properties acquired	11,590	10,659
In-Place Leases [Member] | Allen, TX [Member]	'	'
Business Acquisition [Line Items]	'	'
Fair value of acquired assets related to the properties acquired	598	1,525
In-Place Leases [Member] | Colleyville, TX [Member]	'	'
Business Acquisition [Line Items]	'	'
Fair value of acquired assets related to the properties acquired	486	'
In-Place Leases [Member] | Rancho Cordova, CA [Member]	'	'
Business Acquisition [Line Items]	'	'
Fair value of acquired assets related to the properties acquired	473	'
In-Place Leases [Member] | Coppell, TX [Member]	'	'
Business Acquisition [Line Items]	'	'
Fair value of acquired assets related to the properties acquired	636	'
In-Place Leases [Member] | Columbus, OH [Member]	'	'
Business Acquisition [Line Items]	'	'
Fair value of acquired assets related to the properties acquired	823	'
In-Place Leases [Member] | Taylor, PA [Member]	'	'
Business Acquisition [Line Items]	'	'
Fair value of acquired assets related to the properties acquired	6,171	'
In-Place Leases [Member] | Aurora, CO [Member]	'	'
Business Acquisition [Line Items]	'	'
Fair value of acquired assets related to the properties acquired	413	'
In-Place Leases [Member] | Indianapolis, IN [Member]	'	'
Business Acquisition [Line Items]	'	'
Fair value of acquired assets related to the properties acquired	1,990	'
In-Place Leases [Member] | Egg Harbor Township, NJ [Member]	'	'
Business Acquisition [Line Items]	'	'
Fair value of acquired assets related to the properties acquired	'	558
In-Place Leases [Member] | Vance, AL [Member]	'	'
Business Acquisition [Line Items]	'	'
Fair value of acquired assets related to the properties acquired	'	1,097
In-Place Leases [Member] | Blaine, MN [Member]	'	'
Business Acquisition [Line Items]	'	'
Fair value of acquired assets related to the properties acquired	'	1,361
In-Place Leases [Member] | Austin, Texas [Member]	'	'
Business Acquisition [Line Items]	'	'
Fair value of acquired assets related to the properties acquired	'	6,118
Leasing Costs [Member]	'	'
Business Acquisition [Line Items]	'	'
Fair value of acquired assets related to the properties acquired	5,050	4,613
Leasing Costs [Member] | Allen, TX [Member]	'	'
Business Acquisition [Line Items]	'	'
Fair value of acquired assets related to the properties acquired	273	1,146
Leasing Costs [Member] | Colleyville, TX [Member]	'	'
Business Acquisition [Line Items]	'	'
Fair value of acquired assets related to the properties acquired	220	'
Leasing Costs [Member] | Rancho Cordova, CA [Member]	'	'
Business Acquisition [Line Items]	'	'
Fair value of acquired assets related to the properties acquired	546	'
Leasing Costs [Member] | Coppell, TX [Member]	'	'
Business Acquisition [Line Items]	'	'
Fair value of acquired assets related to the properties acquired	293	'
Leasing Costs [Member] | Columbus, OH [Member]	'	'
Business Acquisition [Line Items]	'	'
Fair value of acquired assets related to the properties acquired	719	'
Leasing Costs [Member] | Taylor, PA [Member]	'	'
Business Acquisition [Line Items]	'	'
Fair value of acquired assets related to the properties acquired	1,452	'
Leasing Costs [Member] | Aurora, CO [Member]	'	'
Business Acquisition [Line Items]	'	'
Fair value of acquired assets related to the properties acquired	806	'
Leasing Costs [Member] | Indianapolis, IN [Member]	'	'
Business Acquisition [Line Items]	'	'
Fair value of acquired assets related to the properties acquired	741	'
Leasing Costs [Member] | Egg Harbor Township, NJ [Member]	'	'
Business Acquisition [Line Items]	'	'
Fair value of acquired assets related to the properties acquired	'	189
Leasing Costs [Member] | Vance, AL [Member]	'	'
Business Acquisition [Line Items]	'	'
Fair value of acquired assets related to the properties acquired	'	678
Leasing Costs [Member] | Blaine, MN [Member]	'	'
Business Acquisition [Line Items]	'	'
Fair value of acquired assets related to the properties acquired	'	694
Leasing Costs [Member] | Austin, Texas [Member]	'	'
Business Acquisition [Line Items]	'	'
Fair value of acquired assets related to the properties acquired	'	$1,906

Real_Estate_and_Intangible_Ass7

Real Estate and Intangible Assets - Schedule of Revenue and Earnings Recognized on Properties Acquired (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Business Acquisition [Line Items]	'	'	'	'
Rental Revenue	$2,105	$2,207	$3,016	$2,716
Earnings	1,047	802	1,422	1,037
Allen, TX [Member]	'	'	'	'
Business Acquisition [Line Items]	'	'	'	'
Acquisition Date	'	'	27-Mar-14	10-Jul-13
Rental Revenue	143	325	293	325
Earnings	101	136	167	136
Colleyville, TX [Member]	'	'	'	'
Business Acquisition [Line Items]	'	'	'	'
Acquisition Date	'	'	27-Mar-14	'
Rental Revenue	117	'	240	'
Earnings	83	'	138	'
Rancho Cordova, CA [Member]	'	'	'	'
Business Acquisition [Line Items]	'	'	'	'
Acquisition Date	'	'	22-Apr-14	'
Rental Revenue	226	'	399	'
Earnings	104	'	168	'
Coppell, TX [Member]	'	'	'	'
Business Acquisition [Line Items]	'	'	'	'
Acquisition Date	'	'	8-May-14	'
Rental Revenue	150	'	239	'
Earnings	116	'	139	'
Columbus, OH [Member]	'	'	'	'
Business Acquisition [Line Items]	'	'	'	'
Acquisition Date	'	'	13-May-14	'
Rental Revenue	311	'	479	'
Earnings	115	'	184	'
Taylor, PA [Member]	'	'	'	'
Business Acquisition [Line Items]	'	'	'	'
Acquisition Date	'	'	9-Jun-14	'
Rental Revenue	850	'	1,058	'
Earnings	395	'	493	'
Aurora, CO [Member]	'	'	'	'
Business Acquisition [Line Items]	'	'	'	'
Acquisition Date	'	'	1-Jul-14	'
Rental Revenue	192	'	192	'
Earnings	124	'	124	'
Indianapolis, IN [Member]	'	'	'	'
Business Acquisition [Line Items]	'	'	'	'
Acquisition Date	'	'	3-Sep-14	'
Rental Revenue	116	'	116	'
Earnings	9	'	9	'
Egg Harbor Township, NJ [Member]	'	'	'	'
Business Acquisition [Line Items]	'	'	'	'
Acquisition Date	'	'	'	28-Mar-13
Rental Revenue	'	122	'	250
Earnings	'	61	'	130
Vance, AL [Member]	'	'	'	'
Business Acquisition [Line Items]	'	'	'	'
Acquisition Date	'	'	'	8-May-13
Rental Revenue	'	293	'	464
Earnings	'	147	'	218
Blaine, MN [Member]	'	'	'	'
Business Acquisition [Line Items]	'	'	'	'
Acquisition Date	'	'	'	10-May-13
Rental Revenue	'	369	'	579
Earnings	'	161	'	256
Austin, Texas [Member]	'	'	'	'
Business Acquisition [Line Items]	'	'	'	'
Acquisition Date	'	'	'	9-Jul-13
Rental Revenue	'	1,098	'	1,098
Earnings	'	$297	'	$297

Real_Estate_and_Intangible_Ass8

Real Estate and Intangible Assets - Pro-Forma Condensed Consolidated Statements of Operations (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, except Share data, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Operating Data:	'	'	'	'
Total operating revenue	$19,086	$19,060	$58,050	$56,906
Total operating expenses	-11,434	-10,538	-47,780	-32,479
Other expenses	-7,283	-8,215	-21,269	-24,347
Net income (loss)	369	307	-10,999	-80
Dividends attributable to preferred and senior common stock	-1,160	-1,106	-3,417	-3,274
Net loss attributable to common stockholders	($791)	($799)	($14,416)	($3,194)
Share and Per Share Data:	'	'	'	'
Basic and diluted loss per share of common stock	($0.04)	($0.06)	($0.86)	($0.25)
Weighted average shares outstanding-basic	17,739,084	14,196,423	16,685,162	12,613,354
Weighted average shares outstanding-diluted	17,739,084	14,196,423	16,685,162	12,613,354

Real_Estate_and_Intangible_Ass9

Real Estate and Intangible Assets - Pro-Forma Condensed Consolidated Statements of Operations (Parenthetical) (Detail) (USD $)	3 Months Ended	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2014
Business Combinations [Abstract]	'	'
Impairment charge	$280	$14,238

Recovered_Sheet1

Real Estate and Intangible Assets - Future Operating Lease Payments from Tenants under Non-Cancelable Leases (Detail) (USD $)	Sep. 30, 2014
In Thousands, unless otherwise specified
Leases [Abstract]	'
Three Months ending December 31, 2014	$16,929
2015	68,254
2016	65,416
2017	64,689
2018	64,103
2019	64,403
Thereafter	$290,868

Recovered_Sheet2

Real Estate and Intangible Assets - Carrying Value of Intangible Assets and Accumulated Amortization (Detail) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Finite-Lived Intangible Assets [Line Items]	'	'
Lease Intangibles	$136,803	$114,520
Accumulated Amortization	-42,161	-34,888
In-Place Leases [Member]	'	'
Finite-Lived Intangible Assets [Line Items]	'	'
Lease Intangibles	58,925	47,442
Accumulated Amortization	-18,391	-15,158
Leasing Costs [Member]	'	'
Finite-Lived Intangible Assets [Line Items]	'	'
Lease Intangibles	36,969	31,339
Accumulated Amortization	-11,419	-9,323
Customer Relationships [Member]	'	'
Finite-Lived Intangible Assets [Line Items]	'	'
Lease Intangibles	40,909	35,739
Accumulated Amortization	($12,351)	($10,407)

Recovered_Sheet3

Real Estate and Intangible Assets - Weighted Average Amortization Period for Intangible Assets Acquired and Liabilities Assumed (Detail)	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Finite-Lived Intangible Assets [Line Items]	'	'
Period for intangible assets and liabilities	'11 years 6 months	'9 years 10 months 24 days
In-Place Leases [Member]	'	'
Finite-Lived Intangible Assets [Line Items]	'	'
Period for intangible assets and liabilities	'10 years 2 months 12 days	'8 years 9 months 18 days
Leasing Costs [Member]	'	'
Finite-Lived Intangible Assets [Line Items]	'	'
Period for intangible assets and liabilities	'10 years 2 months 12 days	'8 years 9 months 18 days
Customer Relationships [Member]	'	'
Finite-Lived Intangible Assets [Line Items]	'	'
Period for intangible assets and liabilities	'14 years 7 months 6 days	'13 years 6 months
Above Market Leases [Member]	'	'
Finite-Lived Intangible Assets [Line Items]	'	'
Period for intangible assets and liabilities	'9 years 3 months 18 days	'8 years 9 months 18 days
Below Market Leases [Member]	'	'
Finite-Lived Intangible Assets [Line Items]	'	'
Period for intangible assets and liabilities	'9 years 10 months 24 days	'7 years 2 months 12 days

Recovered_Sheet4

Real Estate and Intangible Assets - Estimated Aggregate Amortization Expense (Detail) (USD $)	Sep. 30, 2014
In Thousands, unless otherwise specified
Goodwill and Intangible Assets Disclosure [Abstract]	'
Three Months ending December 31, 2014	$3,049
2015	11,931
2016	11,224
2017	11,018
2018	10,719
2019	10,711
Thereafter	$35,990

Real_Estate_Held_for_Sale_and_2

Real Estate Held for Sale and Impairment Charges - Additional Information (Detail) (USD $)	0 Months Ended	3 Months Ended	9 Months Ended
In Thousands, unless otherwise specified	Jun. 06, 2014	Sep. 30, 2014	Sep. 30, 2014
Real Estate [Abstract]	'	'	'
Proceeds from sale of real estate	$11,400	'	$11,162
Gain on sale of real estate	1,200	'	1,240
Impairment loss	'	$280	$14,238
Expiration period of property lease	'	'	'2017-01
Extended period of lease on property	'	'	'2 years

Real_Estate_Held_for_Sale_and_3

Real Estate Held for Sale and Impairment Charges - Components of Income from Real Estate and Related Assets Held for Sale (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Real Estate Properties [Line Items]	'	'	'	'
Income from real estate and related assets held for sale	$19,014	$16,190	$54,540	$44,482
Real Estate Held for Sale [Member]	'	'	'	'
Real Estate Properties [Line Items]	'	'	'	'
Operating revenue	'	292	507	875
Operating expense	'	57	40	172
Income from real estate and related assets held for sale	'	$235	$467	$703

Mortgage_Note_Receivable_Addit

Mortgage Note Receivable - Additional Information (Detail) (USD $)	0 Months Ended
In Millions, unless otherwise specified	Jul. 25, 2014	Jul. 25, 2014
		sqft
Debt Disclosure [Abstract]	'	'
Second mortgage development loan	'	$5.60
Acquisition of our property, area	'	81,371
Construction loans scheduled maturity	'2015-07	'
Percentage of Interest earned in cash	'	9.00%
Estimated percentage of rate of Interest	'	22.00%
Mortgage development loan scheduled maturity	'2016-07	'

Mortgage_Notes_Payable_and_Lin2

Mortgage Notes Payable and Line of Credit - Company's Mortgage Notes Payable and Line of Credit (Detail) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
	Property
Debt Instrument [Line Items]	'	'
Encumbered properties	93	'
Carrying value	$505,958	$447,002
Stated Interest Rates	'One month LIBOR was approximately 0.15%.	'
Libor rate	0.15%	'
Variable Rate Line of Credit [Member]	'	'
Debt Instrument [Line Items]	'	'
Encumbered properties	17	'
Carrying value	45,600	24,400
Stated Interest Rates	'LIBOR + 2.75%	'
Libor rate	2.75%	'
Scheduled Maturity Dates	1-Aug-17	'
Premiums and Discounts (Net) [Member]	'	'
Debt Instrument [Line Items]	'	'
Carrying value	783	724
Fixed Rate Mortgage Loans [Member]	'	'
Debt Instrument [Line Items]	'	'
Encumbered properties	72	'
Carrying value	451,375	413,678
Variable Rate Mortgage Loans [Member]	'	'
Debt Instrument [Line Items]	'	'
Encumbered properties	4	'
Carrying value	8,200	8,200
Stated Interest Rates	'LIBOR + 2.15%	'
Libor rate	2.15%	'
Scheduled Maturity Dates	1-Dec-16	'
Mortgages Notes Payable [Member]	'	'
Debt Instrument [Line Items]	'	'
Encumbered properties	76	'
Carrying value	$460,358	$422,602

Mortgage_Notes_Payable_and_Lin3

Mortgage Notes Payable and Line of Credit - Company's Mortgage Notes Payable and Line of Credit (Parenthetical) (Detail)	9 Months Ended
	Sep. 30, 2014
	Mortgages
Debt Instrument [Line Items]	'
Number of mortgage notes payable	41
Libor rate description	'One month LIBOR was approximately 0.15%.
Libor rate	0.15%
Weighted average interest rate on all debt outstanding	5.13%
Fixed Rate Mortgage Loans [Member]	'
Debt Instrument [Line Items]	'
Number of mortgage notes payable	41
Maturity date of mortgage notes payable, start date	1-Sep-15
Maturity date of mortgage notes payable, end date	6-Jan-39
Minimum [Member] | Fixed Rate Mortgage Loans [Member]	'
Debt Instrument [Line Items]	'
Stated Interest Rates	4.04%
Maximum [Member] | Fixed Rate Mortgage Loans [Member]	'
Debt Instrument [Line Items]	'
Stated Interest Rates	6.80%

Mortgage_Notes_Payable_and_Lin4

Mortgage Notes Payable and Line of Credit - Additional Information (Detail) (USD $)	0 Months Ended	9 Months Ended		1 Months Ended				9 Months Ended
	Mar. 28, 2014	Sep. 30, 2014	Dec. 31, 2013	Aug. 31, 2013	Sep. 30, 2014	Aug. 31, 2013	Sep. 30, 2014	Sep. 30, 2014
		Mortgages		Senior Unsecured Revolving Credit Facility [Member]	Senior Unsecured Revolving Credit Facility [Member]	Senior Secured Revolving Credit Facility [Member]	Letter of Credit [Member]	Mortgage Notes Payable [Member]
		Property
Debt Instrument [Line Items]	'	'	'	'	'	'	'	'
Number of mortgage notes payable	'	41	'	'	'	'	'	'
Weighted average interest on debt outstanding	'	5.13%	'	'	'	'	2.75%	5.35%
Number of properties collateralized in mortgage notes payable	'	76	'	'	'	'	'	'
Net book value of collateralized mortgage properties	'	$614,500,000	'	'	'	'	'	'
Number of long-term mortgages issued	'	2	'	'	'	'	'	'
Number of properties to collateralized mortgage notes payable	'	3	'	'	'	'	'	'
Number of long-term mortgages assumed	'	3	'	'	'	'	'	'
Number of properties to issue collateralized mortgage notes payable	'	3	'	'	'	'	'	'
Excess of LIBOR rate	'	'	'	'	'	'	'	3.00%
Fair value of mortgage notes payable outstanding	'	467,500,000	'	'	'	'	'	'
Carrying value of mortgage notes payable outstanding	'	460,358,000	422,602,000	'	'	'	'	'
Line of credit, outstanding	'	45,600,000	24,400,000	60,000,000	45,600,000	75,000,000	'	'
Line of credit, maturity date	'2017-08	'	'	'2017-08	'	'	'	'
Extension period subject to payment of fee	'1 year	'	'	'1 year	'	'	'	'
Extension fee on the initial maturity date	0.25%	'	'	0.25%	'	'	'	'
Standby letters of credit sublimit	'	'	'	20,000,000	'	'	'	'
Line of credit facility, maximum additional amount drawn	'	5,300,000	'	75,000,000	'	'	'	'
Line of credit, variable spread on interest rate	'	'	'	3.00%	'	'	'	'
Annual maintenance fee	'	'	'	30,000	'	'	'	'
Unused commitment fee	'	'	'	0.25%	'	'	'	'
Line of credit covenant limit of distributions to shareholders percentage	'	'	'	100.00%	'	'	'	'
Line of credit facility, maximum additional amount drawn	'	'	'	1,300,000	'	'	'	'
Extension fee on the initial maturity date	'	'	'	0.0025	'	'	'	'
Line of credit at an interest rate	'	'	'	'	2.90%	'	'	'
Letters of credit, outstanding	'	'	'	'	'	'	$5,800,000	'

Mortgage_Notes_Payable_and_Lin5

Mortgage Notes Payable and Line of Credit - Summary of Long Term Mortgages (Detail) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013
Debt Instrument [Line Items]	'	'
Debt Issued	$43,781	$56,100
Wells Fargo N.A [Member] | Maturity Date One [Member]	'	'
Debt Instrument [Line Items]	'	'
Date of Issuance	27-Mar-14	'
Issuing Bank	'Wells Fargo N.A.	'
Debt Issued	6,330	'
Interest Rate	5.58%	'
Maturity Date	1-Feb-16	'
Wells Fargo N.A [Member] | Maturity Date Three [Member]	'	'
Debt Instrument [Line Items]	'	'
Date of Issuance	8-May-14	'
Issuing Bank	'Wells Fargo N.A.	'
Debt Issued	3,816	'
Interest Rate	6.25%	'
Maturity Date	1-Jun-16	'
Key Bank N.A [Member] | Maturity Date Two [Member]	'	'
Debt Instrument [Line Items]	'	'
Date of Issuance	22-Apr-14	'
Issuing Bank	'Keybank N.A.	'
Debt Issued	4,935	'
Interest Rate	4.90%	'
Maturity Date	1-May-24	'
Prudential Mortgage Capital Company [Member] | Maturity Date Four [Member]	'	'
Debt Instrument [Line Items]	'	'
Date of Issuance	9-Jun-14	'
Issuing Bank	'Prudential Mortgage Capital Company	'
Debt Issued	22,600	'
Interest Rate	4.23%	'
Maturity Date	1-Jul-19	'
Everbank [Member] | Maturity Date Five [Member]	'	'
Debt Instrument [Line Items]	'	'
Date of Issuance	3-Sep-14	'
Issuing Bank	'Everbank	'
Debt Issued	$6,100	'
Interest Rate	4.40%	'
Maturity Date	1-Oct-24	'

Mortgage_Notes_Payable_and_Lin6

Mortgage Notes Payable and Line of Credit - Principal Payments of Mortgage Notes Payable (Detail) (Mortgages Notes Payable [Member], USD $)	Sep. 30, 2014
In Thousands, unless otherwise specified
Mortgages Notes Payable [Member]	'
Debt Instrument [Line Items]	'
Three Months ending December 31, 2014	$18,898
2015	42,683
2016	98,720
2017	67,315
2018	19,909
2019	34,570
Thereafter	177,480
Total Mortgage Notes Payable	$459,575

Mortgage_Notes_Payable_and_Lin7

Mortgage Notes Payable and Line of Credit - Summary of Interest Rate Cap Agreement (Detail) (Mortgage Notes Payable [Member], USD $)	9 Months Ended	12 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Mortgage Notes Payable [Member]	'	'
Debt Instrument [Line Items]	'	'
Date of Issuance	26-Nov-13	'
Notional Amount	$8,200	'
LIBOR Cap	3.00%	'
Maturity Date	1-Dec-16	'
Cost	31	31
Fair Value	$7	$22

Mandatorily_Redeemable_Preferr1

Mandatorily Redeemable Preferred Stock - Additional Information (Detail) (USD $)	1 Months Ended	9 Months Ended
	Feb. 29, 2012	Sep. 30, 2014	Dec. 31, 2013
Class of Stock [Line Items]	'	'	'
Public offering of preferred stock	'	2,150,000	2,150,000
Preferred stock, par value	'	$0.00	$0.00
Preferred shares at a redemption price	$25	'	'
Preferred Stock redemption term	'	'On or after January 31, 2016, we may redeem the shares at a redemption price of $25.00 per share, plus any accumulated and unpaid dividends to and including the date of redemption.	'
Preferred Stock mandatory redemption date	31-Jan-17	'	'
Deferred financing costs	$1,800,000	'	'
Carrying value term preferred stock	'	2,000	2,000
Mandatorily Redeemable Preferred Stock [Member]	'	'	'
Class of Stock [Line Items]	'	'	'
Public offering of preferred stock	1,540,000	'	'
Preferred stock, par value	$0.00	'	'
Public offering price	$25	'	'
Gross proceeds of the offering totaled	38,500,000	'	'
Net proceeds, after deducting offering expenses	36,700,000	'	'
Fair value of term preferred stock	'	40,500,000	'
Carrying value term preferred stock	'	$38,500,000	$38,500,000
Closing price of term preferred stock	'	$26.28	'
Series C Preferred Stock [Member]	'	'	'
Class of Stock [Line Items]	'	'	'
Series C preferred stock	7.13%	'	'
Series C Preferred Stock [Member] | Mandatorily Redeemable Preferred Stock [Member]	'	'	'
Class of Stock [Line Items]	'	'	'
Public offering of preferred stock	'	1,540,000	1,540,000
Preferred stock, par value	'	$0.00	$0.00

Commitments_and_Contingencies_1

Commitments and Contingencies - Additional Information (Detail) (USD $)	9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013
	Lease
Commitments and Contingencies Disclosure [Abstract]	'	'
Number of leases	3	'
Expenses incurred for the properties listed	$0.30	$0.30

Commitments_and_Contingencies_2

Commitments and Contingencies - Future Minimum Rental Payments Due under Terms of Leases (Detail) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014
Operating Leased Assets [Line Items]	'
For the year ended December 31, 2014	$16,929
For the year ended December 31, 2015	65,416
For the year ended December 31, 2016	64,689
For the year ended December 31, 2017	64,103
For the year ended December 31, 2018	64,403
Ground Leases [Member]	'
Operating Leased Assets [Line Items]	'
For the year ended December 31, 2014	103
For the year ended December 31, 2015	413
For the year ended December 31, 2016	413
For the year ended December 31, 2017	416
For the year ended December 31, 2018	417
For the year ended December 31, 2019	417
Thereafter	4,501
Ground Leases [Member] | Tulsa, OK [Member]	'
Operating Leased Assets [Line Items]	'
Lease End Date	'2021-04
For the year ended December 31, 2014	38
For the year ended December 31, 2015	153
For the year ended December 31, 2016	153
For the year ended December 31, 2017	153
For the year ended December 31, 2018	153
For the year ended December 31, 2019	153
Thereafter	229
Ground Leases [Member] | Dartmouth, MA [Member]	'
Operating Leased Assets [Line Items]	'
Lease End Date	'2036-05
For the year ended December 31, 2014	44
For the year ended December 31, 2015	174
For the year ended December 31, 2016	174
For the year ended December 31, 2017	174
For the year ended December 31, 2018	174
For the year ended December 31, 2019	174
Thereafter	3,300
Ground Leases [Member] | Springfield, MA [Member]	'
Operating Leased Assets [Line Items]	'
Lease End Date	'2030-02
For the year ended December 31, 2014	21
For the year ended December 31, 2015	86
For the year ended December 31, 2016	86
For the year ended December 31, 2017	89
For the year ended December 31, 2018	90
For the year ended December 31, 2019	90
Thereafter	$972

Commitments_and_Contingencies_3

Commitments and Contingencies - Future Tenant Improvement Payments Due on Properties (Detail) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014
Operating Leased Assets [Line Items]	'
2014	$16,929
2015	65,416
2016	64,689
2017	64,103
2018	64,403
Tenant Improvements [Member]	'
Operating Leased Assets [Line Items]	'
2014	53
2015	1,000
2016	'
2017	'
2018	'
2019	'
Thereafter	'
Tenant Improvements [Member] | Burnsville, MN [Member]	'
Operating Leased Assets [Line Items]	'
Lease End Date	'2023-01
2014	53
2015	1,000
2016	'
2017	'
2018	'
2019	'
Thereafter	'

Stockholders_Equity_Summary_of

Stockholders' Equity - Summary of Changes in Stockholders' Equity (Detail) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Beginning balance	'	'	$183,146	'
Issuance of senior common stock and common stock, net	'	'	40,335	'
Distributions declared to common, senior common and preferred stockholders	'	'	-22,219	'
Net loss	229	309	-12,066	1,194
Ending balance	189,196	'	189,196	'
Senior Common Stock [Member]	'	'	'	'
Beginning balance	'	'	'	'
Issuance of senior common stock and common stock, net	'	'	1	'
Distributions declared to common, senior common and preferred stockholders	'	'	'	'
Net loss	'	'	'	'
Ending balance	1	'	1	'
Preferred Stock [Member]	'	'	'	'
Beginning balance	'	'	2	'
Issuance of senior common stock and common stock, net	'	'	'	'
Distributions declared to common, senior common and preferred stockholders	'	'	'	'
Net loss	'	'	'	'
Ending balance	2	'	2	'
Common Stock [Member]	'	'	'	'
Beginning balance	'	'	16	'
Issuance of senior common stock and common stock, net	'	'	2	'
Distributions declared to common, senior common and preferred stockholders	'	'	'	'
Net loss	'	'	'	'
Ending balance	18	'	18	'
Additional Paid in Capital [Member]	'	'	'	'
Beginning balance	'	'	298,751	'
Issuance of senior common stock and common stock, net	'	'	40,332	'
Distributions declared to common, senior common and preferred stockholders	'	'	'	'
Net loss	'	'	'	'
Ending balance	339,083	'	339,083	'
Notes Receivable from Employees [Member]	'	'	'	'
Beginning balance	'	'	-375	'
Issuance of senior common stock and common stock, net	'	'	'	'
Distributions declared to common, senior common and preferred stockholders	'	'	'	'
Net loss	'	'	'	'
Ending balance	-375	'	-375	'
Distributions in Excess of Accumulated Earnings [Member]	'	'	'	'
Beginning balance	'	'	-115,248	'
Issuance of senior common stock and common stock, net	'	'	'	'
Distributions declared to common, senior common and preferred stockholders	'	'	-22,219	'
Net loss	'	'	-12,066	'
Ending balance	($149,533)	'	($149,533)	'

Stockholders_Equity_Dividends_

Stockholders' Equity - Dividends Declared (Detail) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Common Stock [Member]	'	'	'	'
Dividends Payable [Line Items]	'	'	'	'
Common Stock, distributions declared per share	$0.38	$0.38	$1.13	$1.13
Senior Common Stock [Member]	'	'	'	'
Dividends Payable [Line Items]	'	'	'	'
Common Stock, distributions declared per share	$0.26	$0.26	$0.79	$0.79
Series A Preferred Stock [Member]	'	'	'	'
Dividends Payable [Line Items]	'	'	'	'
Preferred Stock, distributions declared per share	$0.48	$0.48	$1.45	$1.45
Series B Preferred Stock [Member]	'	'	'	'
Dividends Payable [Line Items]	'	'	'	'
Preferred Stock, distributions declared per share	$0.47	$0.47	$1.41	$1.41
Series C Preferred Stock [Member]	'	'	'	'
Dividends Payable [Line Items]	'	'	'	'
Preferred Stock, distributions declared per share	$0.45	$0.45	$1.34	$1.34

Stockholders_Equity_Additional

Stockholders' Equity - Additional Information (Detail) (USD $)

0 Months Ended

1 Months Ended

9 Months Ended

3 Months Ended

9 Months Ended

0 Months Ended

Sep. 30, 2014

Jun. 06, 2014

Mar. 31, 2011

Sep. 30, 2014

Sep. 30, 2013

Dec. 31, 2013

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Sep. 30, 2014

Mar. 31, 2011

Sep. 30, 2014

Jun. 06, 2014

Cantor Fitzgerald & Co [Member]

Cantor Fitzgerald & Co [Member]

Jefferies LLC [Member]

Senior Common Stock [Member]

Senior Common Stock [Member]

Distribution Reinvestment Plan [Member]

Public Offering [Member]

Class of Stock [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

Common stock, shares issued

'

'

'

17,907,652

'

15,662,414

'

'

'

'

3,500,000

'

1,610,000

Public offering price per share

'

'

'

'

'

'

'

'

'

'

'

'

$17

Gross proceeds of initial public offering

'

$27,400,000

'

'

'

'

'

'

'

'

'

'

'

Net proceeds of initial public offering

'

26,000,000

'

'

'

'

'

'

'

'

'

'

'

Maximum aggregate sales price of shares to be issued under open market sale agreement

'

'

'

'

'

'

100,000,000

100,000,000

25,000,000

'

'

'

'

Percentage of compensation of gross proceeds on sale of common stock

'

'

'

'

'

'

'

2.00%

'

'

'

'

'

Number of shares sold under open market sale agreement

'

'

'

'

'

'

200,000

200,000

'

'

'

'

'

Gross proceeds of shares sold under open market sale agreement

'

'

'

'

'

'

3,300,000

'

'

'

'

'

'

Maximum remaining capacity to sell common stock under open market sale agreement

'

'

'

'

'

'

96,600,000

96,600,000

'

'

'

'

'

Net proceeds under ATM program

'

'

'

'

'

'

'

'

7,600,000

'

'

'

'

Gross proceeds of shares sold under open market sale agreement

'

'

'

'

'

'

'

'

21,800,000

'

'

'

'

Common stock, par value

'

'

'

$0.00

'

$0.00

'

'

'

'

$0.00

'

'

Common stock shares issued, selling price

'

'

'

'

'

'

'

'

'

'

$15

'

'

Shares intended to be offered pursuant to primary offering

'

'

3,000,000

'

'

'

'

'

'

'

'

'

'

Shares intended to be offered pursuant to senior common distribution reinvestment plan

'

'

500,000

'

'

'

'

'

'

'

'

'

'

Shares of senior common stock sold in ongoing offering

593,659

'

'

'

'

'

'

'

'

'

'

'

'

Senior common stock ongoing offering, gross proceeds

'

'

'

$42,636,000

$62,139,000

'

'

'

'

$8,900,000

'

'

'

Shares of senior common stock issued

'

'

'

659,537

'

374,484

'

'

'

'

'

18,479

'

Stockholders_Equity_Summary_of1

Stockholders' Equity - Summary of Outstanding Note Receivable from an Employee for the Exercise of Stock Options (Detail) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Debt Conversion [Line Items]	'	'
Outstanding Balance of Employee Loan	$375	$375
Note Outstanding One [Member]	'	'
Debt Conversion [Line Items]	'	'
Date Issued	'2006-11	'
Outstanding Balance of Employee Loan	$375	$375
Maturity Date of Note	'2015-11	'
Interest Rate on Note	8.15%	'

Subsequent_Events_Monthly_Dist

Subsequent Events - Monthly Distributions Declared by Company's Board of Directors (Detail) (USD $)	0 Months Ended
	Oct. 07, 2014
Subsequent Event A [Member]	'
Dividends Payable [Line Items]	'
Record Date	22-Oct-14
Payment Date	31-Oct-14
Payable to the Holders of Records During the Month	'October
Subsequent Event A [Member] | Common Stock [Member]	'
Dividends Payable [Line Items]	'
Distribution per Share	0.125
Subsequent Event B [Member]	'
Dividends Payable [Line Items]	'
Record Date	17-Nov-14
Payment Date	26-Nov-14
Payable to the Holders of Records During the Month	'November
Subsequent Event B [Member] | Common Stock [Member]	'
Dividends Payable [Line Items]	'
Distribution per Share	0.125
Subsequent Event C [Member]	'
Dividends Payable [Line Items]	'
Record Date	19-Dec-14
Payment Date	31-Dec-14
Payable to the Holders of Records During the Month	'December
Subsequent Event C [Member] | Common Stock [Member]	'
Dividends Payable [Line Items]	'
Distribution per Share	0.125
Subsequent Event [Member] | Common Stock [Member]	'
Dividends Payable [Line Items]	'
Distribution per Share	0.375
Series A Preferred Stock [Member] | Subsequent Event A [Member]	'
Dividends Payable [Line Items]	'
Distribution per Share	0.1614583
Series A Preferred Stock [Member] | Subsequent Event B [Member]	'
Dividends Payable [Line Items]	'
Distribution per Share	0.1614583
Series A Preferred Stock [Member] | Subsequent Event C [Member]	'
Dividends Payable [Line Items]	'
Distribution per Share	0.1614583
Series A Preferred Stock [Member] | Subsequent Event [Member]	'
Dividends Payable [Line Items]	'
Distribution per Share	0.4843749
Series B Preferred Stock [Member] | Subsequent Event A [Member]	'
Dividends Payable [Line Items]	'
Distribution per Share	0.15625
Series B Preferred Stock [Member] | Subsequent Event B [Member]	'
Dividends Payable [Line Items]	'
Distribution per Share	0.15625
Series B Preferred Stock [Member] | Subsequent Event C [Member]	'
Dividends Payable [Line Items]	'
Distribution per Share	0.15625
Series B Preferred Stock [Member] | Subsequent Event [Member]	'
Dividends Payable [Line Items]	'
Distribution per Share	0.46875
Series C Preferred Stock [Member] | Subsequent Event A [Member]	'
Dividends Payable [Line Items]	'
Distribution per Share	0.1484375
Series C Preferred Stock [Member] | Subsequent Event B [Member]	'
Dividends Payable [Line Items]	'
Distribution per Share	0.1484375
Series C Preferred Stock [Member] | Subsequent Event C [Member]	'
Dividends Payable [Line Items]	'
Distribution per Share	0.1484375
Series C Preferred Stock [Member] | Subsequent Event [Member]	'
Dividends Payable [Line Items]	'
Distribution per Share	0.4453125
Senior Common Stock [Member] | Subsequent Event A [Member]	'
Dividends Payable [Line Items]	'
Payment Date	7-Nov-14
Distribution per Share	0.0875
Senior Common Stock [Member] | Subsequent Event B [Member]	'
Dividends Payable [Line Items]	'
Payment Date	5-Dec-14
Distribution per Share	0.0875
Senior Common Stock [Member] | Subsequent Event C [Member]	'
Dividends Payable [Line Items]	'
Payment Date	8-Jan-15
Distribution per Share	0.0875
Senior Common Stock [Member] | Subsequent Event [Member]	'
Dividends Payable [Line Items]	'
Distribution per Share	0.2625

Subsequent_Events_Additional_I

Subsequent Events - Additional Information (Detail) (USD $)	0 Months Ended		9 Months Ended			0 Months Ended			0 Months Ended
	Jul. 07, 2014	Jun. 11, 2014	Sep. 30, 2014	Sep. 30, 2013	Jul. 25, 2014	Oct. 16, 2014	Oct. 22, 2014	Oct. 22, 2014	Oct. 22, 2014	Oct. 27, 2014
						Subsequent Event [Member]	Subsequent Event [Member]	Subsequent Event [Member]	Subsequent Event [Member]	Subsequent Event [Member]
						Richmond, Virginia [Member]	Canton, North Carolina [Member]	Canton, North Carolina [Member]	Canton, North Carolina [Member]	South Hadley Massachusetts [Member]
						Option		sqft	Previous Lease [Member]
Subsequent Event [Line Items]	'	'	'	'	'	'	'	'	'	'
Lease Term	'	'	'	'	'	'3 years	'	'	'	'
Lease early termination option description	'	'	'	'	'	'The tenant has an early termination option at any time after July 31, 2016.	'	'	'	'
Lease description	'	'	'	'	'	'The tenant is subject to a termination payment of 0.03 if they exercise this option.	'	'	'	'
Termination payment	'	'	'	'	'	$30,000	'	'	'	'
Annualized straight line rent escalations	'	'	'	'	'	200,000	1,400,000	'	600,000	300,000
Number of options for renewal of lease	'	'	'	'	'	1	'	'	'	2
Lease renewal period	'	'	'	'	'	'3 years	'	'	'	'
Leasing commissions paid	200,000	'	898,000	1,008,000	'	100,000	'	'	'	'
Tenant improvements payable	'	'	3,300,000	'	'	0	'	'	'	'
Finance for expansion project on property	'	'	'	'	$5,600,000	'	'	$5,500,000	'	'
Area of additional real estate property	'	'	'	'	'	'	'	150,000	'	'
Lease expiration period, month and year	'	'	'2016-11	'2021-08	'	'	'2024-07	'	'	'2015-01
Extended additional period of lease	'	'3 years	'	'	'	'	'10 years	'	'	'2 years
Extended lease expiration date	'	'	'	'	'	'	'2034-09	'	'	'2017-01
Number of years under additional periods for lease renewal option	'	'	'	'	'	'	'	'	'	'1 year