Saul Centers (BFS) 10-K 4 Mar 16 2015 FY Annual report Financial data

Document and Entity Information

Document and Entity Information - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Mar. 01, 2016	Jun. 30, 2015
Document And Entity Information [Abstract]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2015
Document Fiscal Year Focus	2,015
Document Fiscal Period Focus	FY
Trading Symbol	BFS
Entity Registrant Name	SAUL CENTERS INC
Entity Central Index Key	907,254
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	No
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		21,081,418
Entity Public Float			$ 575.9

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Real estate investments
Land	$ 424,837	$ 420,622
Buildings and equipment	1,114,357	1,109,276
Construction in progress	83,516	30,261
Total	1,622,710	1,560,159
Accumulated depreciation	(425,370)	(396,617)
Real estate investments, net	1,197,340	1,163,542
Cash and cash equivalents	10,003	12,128
Accounts receivable and accrued income, net	51,076	46,784
Deferred leasing costs, net	26,919	26,928
Prepaid expenses, net	4,663	4,093
Deferred debt costs, net	8,737	9,874
Other assets	5,407	3,638
Total assets	1,304,145	1,266,987
Liabilities
Mortgage notes payable	802,034	808,997
Revolving credit facility payable	28,000	43,000
Construction loan payable	45,208	5,391
Dividends and distributions payable	15,380	14,352
Accounts payable, accrued expenses and other liabilities	27,687	23,537
Deferred income	32,109	32,453
Total liabilities	950,418	927,730
Preferred stock, 1,000,000 shares authorized:
Cumulative Redeemable Preferred stock	180,000	180,000
Common stock, $0.01 par value, 30,000,000 shares authorized, 21,266,239 and 20,947,141 shares issued and outstanding, respectively	213	209
Additional paid-in capital	305,008	287,995
Accumulated deficit	(180,091)	(173,774)
Accumulated other comprehensive loss	(1,802)	(1,894)
Total Saul Centers, Inc. stockholders' equity	303,328	292,536
Noncontrolling interests	50,399	46,721
Total stockholders' equity	353,727	339,257
Total liabilities and stockholders' equity	$ 1,304,145	$ 1,266,987

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - $ / shares	Dec. 31, 2015	Dec. 31, 2014
Preferred stock, shares authorized	1,000,000	1,000,000
Cumulative Redeemable Preferred stock, shares issued	72,000	72,000
Cumulative Redeemable Preferred stock, shares outstanding	72,000	72,000
Common stock, par value (in usd per share)	$ 0.01	$ 0.01
Common stock, shares authorized	30,000,000	30,000,000
Common stock, shares issued	21,266,239	20,947,141
Common stock, shares outstanding	21,266,239	20,947,141

Consolidated Statements of Oper

Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Revenue
Base rent	$ 168,303	$ 164,599	$ 159,898
Expense recoveries	32,911	32,132	30,949
Percentage rent	1,608	1,492	1,575
Other	6,255	8,869	5,475
Total revenue	209,077	207,092	197,897
Operating expenses
Property operating expenses	26,565	26,479	24,559
Provision for credit losses	915	680	968
Real estate taxes	23,663	22,354	22,415
Interest expense and amortization of deferred debt costs	45,165	46,034	46,589
Depreciation and amortization of deferred leasing costs	43,270	41,203	49,130
General and administrative	16,353	16,961	14,951
Acquisition related costs	84	949	106
Predevelopment expenses	132	503	3,910
Total operating expenses	156,147	155,163	162,628
Operating income	52,930	51,929	35,269
Change in fair value of derivatives	(10)	(10)	(7)
Loss on early extinguishment of debt	0	0	(497)
Gains on sales of properties	11	6,069	0
Gain on casualty settlement	0	0	77
Net Income (loss)	52,931	57,988	34,842
Income attributable to noncontrolling interests	(10,463)	(11,045)	(3,970)
Net income attributable to Saul Centers, Inc.	42,468	46,943	30,872
Preferred stock redemption	0	(1,480)	(5,228)
Preferred dividends	(12,375)	(13,361)	(13,983)
Net income available to common stockholders	$ 30,093	$ 32,102	$ 11,661
Per share net income available to common stockholders
Basic (in dollars per share)	$ 1.42	$ 1.55	$ 0.57
Diluted (in dollars per share)	$ 1.42	$ 1.54	$ 0.57

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Statement of Comprehensive Income [Abstract]
Net income	$ 52,931	$ 57,988	$ 34,842
Other comprehensive income
Unrealized gain (loss) on cash flow hedge	124	(675)	2,897
Total comprehensive income	53,055	57,313	37,739
Comprehensive income attributable to noncontrolling interests	(10,495)	(10,874)	(4,706)
Total comprehensive income attributable to Saul Centers, Inc.	42,560	46,439	33,033
Preferred stock redemption	0	(1,480)	(5,228)
Preferred dividends	(12,375)	(13,361)	(13,983)
Total comprehensive income available to common stockholders	$ 30,185	$ 31,598	$ 13,822

Consolidated Statements of Stoc

Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Dividend Paid	Dividend Declared	Series A Preferred Stock	Series A Preferred StockDividend Paid	Series A Preferred StockDividend Declared	Series B Preferred Stock	Series B Preferred StockDividend Paid	Series C Preferred Stock	Series C Preferred StockDividend Paid	Series C Preferred StockDividend Declared	Preferred Stock	Preferred StockSeries A Preferred Stock	Preferred StockSeries B Preferred Stock	Preferred StockSeries C Preferred Stock	Common Stock	Additional Paid-in Capital	Additional Paid-in CapitalSeries A Preferred Stock	Additional Paid-in CapitalSeries B Preferred Stock	Additional Paid-in CapitalSeries C Preferred Stock	Accumulated Deficit	Accumulated DeficitDividend Paid	Accumulated DeficitDividend Declared	Accumulated DeficitSeries A Preferred Stock	Accumulated DeficitSeries A Preferred StockDividend Paid	Accumulated DeficitSeries A Preferred StockDividend Declared	Accumulated DeficitSeries B Preferred Stock	Accumulated DeficitSeries B Preferred StockDividend Paid	Accumulated DeficitSeries C Preferred StockDividend Paid	Accumulated DeficitSeries C Preferred StockDividend Declared	Accumulated Other Comprehensive (Loss)	Total Saul Centers, Inc.	Total Saul Centers, Inc.Dividend Paid	Total Saul Centers, Inc.Dividend Declared	Total Saul Centers, Inc.Series A Preferred Stock	Total Saul Centers, Inc.Series A Preferred StockDividend Paid	Total Saul Centers, Inc.Series A Preferred StockDividend Declared	Total Saul Centers, Inc.Series B Preferred Stock	Total Saul Centers, Inc.Series B Preferred StockDividend Paid	Total Saul Centers, Inc.Series C Preferred Stock	Total Saul Centers, Inc.Series C Preferred StockDividend Paid	Total Saul Centers, Inc.Series C Preferred StockDividend Declared	Noncontrolling Interests	Noncontrolling InterestsDividend Paid	Noncontrolling InterestsDividend Declared
Beginning Balance at Dec. 31, 2012	$ 307,289											$ 179,328				$ 201	$ 246,557				$ (154,830)										$ (3,553)	$ 267,703											$ 39,586
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of shares of Series C preferred stock									$ 135,193						$ 140,000					$ (4,807)																				$ 135,193
Redemption of preferred stock				$ (60,004)			$ (79,333)						$ (60,000)	$ (79,328)				$ 2,212	$ 3,007					$ (2,216)			$ (3,012)								$ (60,004)			$ (79,333)
Issuance of common stock:
Pursuant to dividend reinvestment plan	20,672															5	20,667															20,672
Exercise of employee stock options and issuance of directors' deferred stock	2,792																2,792															2,792
Issuance of partnership units pursuant to dividend reinvestment plan	4,144																																										4,144
Net income	34,842																				30,872											30,872											3,970
Change in unrealized loss on cash flow hedge	2,897																														2,161	2,161											736
Preferred stock distributions:
Preferred stock distributions					$ (3,213)	$ (800)		$ (1,468)		$ (6,095)	$ (2,406)														$ (3,213)	$ (800)		$ (1,468)	$ (6,095)	$ (2,406)						$ (3,213)	$ (800)		$ (1,468)		$ (6,095)	$ (2,406)
Common stock distributions		$ (29,455)																				$ (21,988)											$ (21,988)											$ (7,467)
Distributions payable preferred stock
Preferred stock distributions					(3,213)	(800)		$ (1,468)		(6,095)	(2,406)														(3,213)	(800)		$ (1,468)	(6,095)	(2,406)						(3,213)	(800)		$ (1,468)		(6,095)	(2,406)
Distributions payable common stock and distributions payable partnership units			$ (9,929)																				$ (7,408)											$ (7,408)											$ (2,521)
Ending Balance at Dec. 31, 2013	315,126											180,000				206	270,428				(172,564)										(1,392)	276,678											38,448
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of shares of Series C preferred stock									$ 39,260						$ 40,000					$ (740)																				$ 39,260
Redemption of preferred stock				$ (40,000)									$ (40,000)					$ 1,475						$ (1,475)											$ (40,000)
Issuance of common stock:
Pursuant to dividend reinvestment plan	9,264															2	9,262															9,264
Exercise of employee stock options and issuance of directors' deferred stock	7,571															1	7,570															7,571
Issuance of partnership units pursuant to dividend reinvestment plan	8,877																																										8,877
Net income	57,988																				46,943											46,943											11,045
Change in unrealized loss on cash flow hedge	(675)																														(502)	(502)											(173)
Preferred stock distributions:
Preferred stock distributions					(3,049)					(7,219)	(3,094)														(3,049)				(7,219)	(3,094)						(3,049)					(7,219)	(3,094)
Common stock distributions		(33,534)																				(24,937)											(24,937)											(8,597)
Distributions payable preferred stock
Preferred stock distributions					$ (3,049)					(7,219)	$ (3,094)														$ (3,049)				(7,219)	$ (3,094)						$ (3,049)					(7,219)	$ (3,094)
Distributions payable common stock and distributions payable partnership units			(11,258)																				(8,379)											(8,379)											(2,879)
Ending Balance at Dec. 31, 2014	339,257											180,000				209	287,995				(173,774)										(1,894)	292,536											46,721
Issuance of common stock:
Pursuant to dividend reinvestment plan	10,650															3	10,647															10,650
Exercise of employee stock options and issuance of directors' deferred stock	6,367															1	6,366															6,367
Issuance of partnership units pursuant to dividend reinvestment plan	5,673																																										5,673
Net income	52,931																				42,468											42,468											10,463
Change in unrealized loss on cash flow hedge	124																														92	92											32
Preferred stock distributions:
Preferred stock distributions						(3,093)				(9,282)																(3,093)			(9,282)								(3,093)				(9,282)
Common stock distributions		$ (36,614)																				$ (27,265)											$ (27,265)											$ (9,349)
Distributions payable preferred stock
Preferred stock distributions						$ (3,093)				$ (9,282)																$ (3,093)			$ (9,282)								$ (3,093)				$ (9,282)
Distributions payable common stock and distributions payable partnership units			$ (12,286)																				$ (9,145)											$ (9,145)											$ (3,141)
Ending Balance at Dec. 31, 2015	$ 353,727											$ 180,000				$ 213	$ 305,008				$ (180,091)										$ (1,802)	$ 303,328											$ 50,399

Consolidated Statements of Sto7

Consolidated Statements of Stockholders' Equity (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Pursuant to dividend reinvestment plan, shares	201,212	197,638	475,162
Exercise of employee stock options and issuance of directors' deferred stock, shares	117,886	172,887	56,002
Issuance of partnership units pursuant to dividend reinvestment plan, shares	107,037	196,183	88,309
Series A Preferred Stock
Redemption of preferred stock, shares		16,000	24,000
Series B Preferred Stock
Redemption of preferred stock, shares			31,731
Series C Preferred Stock
Issuance of common stock, shares		16,000	56,000
Dividend Declared
Distributions payable common stock (in usd per share)	$ 0.43	$ 0.40	$ 0.36
Distributions partnership units (in usd per share)	0.43	0.40	0.36
Dividend Declared | Series A Preferred Stock
Preferred stock (in usd per share)			50
Dividend Declared | Series C Preferred Stock
Preferred stock (in usd per share)	$ 42.97	$ 42.97	$ 42.97

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014		Dec. 31, 2013
Cash flows from operating activities:
Net income	$ 52,931	$ 57,988		$ 34,842
Adjustments to reconcile net income to net cash provided by operating activities:
Change in fair value of derivatives	10	10		7
Gains on sales of properties	(11)	(6,069)		0
Gain on casualty settlement	0	0		(77)
Depreciation and amortization of deferred leasing costs	43,270	41,203		49,130
Amortization of deferred debt costs	1,433	1,327		1,257
Non cash compensation costs of stock grants and options	1,434	1,240		1,145
Provision for credit losses	915	680		968
Increase in accounts receivable and accrued income	(5,207)	(3,320)		(3,669)
Additions to deferred leasing costs	(5,563)	(4,048)		(5,876)
Increase in prepaid expenses	(570)	(60)		(152)
(Increase) decrease in other assets	1,535	(694)		353
Increase (decrease) in accounts payable, accrued expenses and other liabilities	(937)	1,149		(3,286)
Decrease in deferred income	(344)	(2,838)		(1,115)
Net cash provided by operating activities	88,896	86,568		73,527
Cash flows from investing activities:
Acquisitions of real estate investments	(4,894)	(57,494)	[1]	(5,124)
Additions to real estate investments	(18,855)	(14,986)		(13,999)
Additions to development and redevelopment projects	(45,870)	(17,788)		(7,316)
Proceeds from sale of properties	32	6,679		0
Proceeds from casualty settlement	0	0		405
Net cash used in investing activities	(69,587)	(83,589)		(26,034)
Cash flows from financing activities:
Proceeds from mortgage notes payable	46,000	0	[1]	101,600
Repayments on mortgage notes payable	(52,963)	(22,071)		(71,308)
Proceeds from construction loans payable	39,817	5,391		0
Proceeds from revolving credit facility	20,000	90,000		142,000
Repayments on revolving credit facility	(35,000)	(47,000)		(180,000)
Additions to deferred debt costs	(296)	(1,264)		(3,219)
Proceeds from the issuance of:
Common stock	15,583	15,596		22,292
Partnership units	5,673	8,877		4,144
Preferred stock redemption costs	0	0		(9)
Distributions to:
Preferred stockholders	(12,375)	(13,474)		(14,561)
Common stockholders	(35,645)	(32,346)		(29,205)
Noncontrolling interests	(12,228)	(11,117)		(9,956)
Net cash used in financing activities	(21,434)	(8,148)		(42,329)
Net increase (decrease) in cash and cash equivalents	(2,125)	(5,169)		5,164
Cash and cash equivalents, beginning of year	12,128	17,297		12,133
Cash and cash equivalents, end of year	10,003	12,128		17,297
Supplemental disclosure of cash flow information:
Cash paid for interest	45,965	45,443		45,743
Notes Assumed		11,000
Series C Preferred Stock
Proceeds from the issuance of:
Series C preferred stock	0	39,260		135,221
Distributions to:
Preferred stockholders	(12,375)	(9,625)		(6,095)
Series A Preferred Stock
Proceeds from the issuance of:
Preferred stock redemption payments	0	(40,000)		(60,000)
Distributions to:
Preferred stockholders	0	(3,849)		(5,213)
Series B Preferred Stock
Proceeds from the issuance of:
Preferred stock redemption payments	0	0		(79,328)
Distributions to:
Preferred stockholders	$ 0	$ 0		$ (3,253)
[1]	The 2014 acquisition of real estate and proceeds from notes payable each exclude $11,000 in connection with the sale and leaseback of the Company's Olney property.

Organization, Formation, and Ba

Organization, Formation, and Basis of Presentation	12 Months Ended
	Dec. 31, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization, Formation, and Basis of Presentation	ORGANIZATION, FORMATION, AND BASIS OF PRESENTATION Organization Saul Centers, Inc. (“Saul Centers”) was incorporated under the Maryland General Corporation Law on June 10, 1993. Saul Centers operates as a real estate investment trust (a “REIT”) under the Internal Revenue Code of 1986, as amended (the “Code”). The Company is required to annually distribute at least 90% of its REIT taxable income (excluding net capital gains) to its stockholders and meet certain organizational and other requirements. Saul Centers has made and intends to continue to make regular quarterly distributions to its stockholders. Saul Centers, together with its wholly owned subsidiaries and the limited partnerships of which Saul Centers or one of its subsidiaries is the sole general partner, are referred to collectively as the “Company.” B. Francis Saul II serves as Chairman of the Board of Directors and Chief Executive Officer of Saul Centers. Formation and Structure of Company Saul Centers was formed to continue and expand the shopping center business previously owned and conducted by the B. F. Saul Real Estate Investment Trust, the B. F. Saul Company and certain other affiliated entities, each of which is controlled by B. Francis Saul II and his family members (collectively, the “Saul Organization”). On August 26, 1993, members of the Saul Organization transferred to Saul Holdings Limited Partnership, a newly formed Maryland limited partnership (the “Operating Partnership”), and two newly formed subsidiary limited partnerships (the “Subsidiary Partnerships,” and collectively with the Operating Partnership, the “Partnerships”), shopping center and mixed-used properties, and the management functions related to the transferred properties. Since its formation, the Company has developed and purchased additional properties. The following table lists the significant properties acquired, developed and/or disposed of by the Company since January 1, 2013 . Name of Property Location Type Year of Acquisition/ Development/ Disposal Acquisitions 1580 Rockville Pike Rockville, Maryland Shopping Center January 2014 1582 Rockville Pike Rockville, Maryland Shopping Center April 2014 750 N. Glebe Road Arlington, Virginia Shopping Center August 2014 730 N. Glebe Road Arlington, Virginia Shopping Center December 2014 1584 Rockville Pike Rockville, Maryland Shopping Center December 2014 726 N. Glebe Road Arlington, Virginia Shopping Center September 2015 Developments Park Van Ness Washington, DC Mixed-Use 2013-2015 Dispositions Giant Center Milford Mill, Maryland Shopping Center April 2014 As of December 31, 2015 , the Company’s properties (the “Current Portfolio Properties”) consisted of 50 shopping center properties (the “Shopping Centers”), six mixed-use properties, one of which was designated as held for sale, which are comprised of office, retail and multi-family residential uses (the “Mixed-Use Properties”) and three (non-operating) development properties. Basis of Presentation The accompanying financial statements are presented on the historical cost basis of the Saul Organization because of affiliated ownership and common management and because the assets and liabilities were the subject of a business combination with the Operating Partnership, the Subsidiary Partnerships and Saul Centers, all newly formed entities with no prior operations.

Summary of Significant Accounti

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2015
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES Nature of Operations The Company, which conducts all of its activities through its subsidiaries, the Operating Partnership and Subsidiary Partnerships, engages in the ownership, operation, management, leasing, acquisition, renovation, expansion, development and financing of community and neighborhood shopping centers and mixed-used properties, primarily in the Washington, DC/Baltimore metropolitan area. Because the properties are located primarily in the Washington, DC/Baltimore metropolitan area, a disproportionate economic downturn in the local economy would have a greater negative impact on our overall financial performance than on the overall financial performance of a company with a portfolio that is more geographically diverse. A majority of the Shopping Centers are anchored by several major tenants. As of December 31, 2015 , 31 of the Shopping Centers were anchored by a grocery store and offer primarily day-to-day necessities and services. Two retail tenants, Giant Food ( 4.4% ), a tenant at nine Shopping Centers, and Albertson's/Safeway ( 2.7% ), a tenant at nine Shopping Centers, individually accounted for 2.5% or more of the Company’s total revenue for the year ended December 31, 2015 . Principles of Consolidation The accompanying consolidated financial statements include the accounts of Saul Centers, its subsidiaries, and the Operating Partnership and Subsidiary Partnerships which are majority owned by Saul Centers. All significant intercompany balances and transactions have been eliminated in consolidation. Use of Estimates The preparation of financial statements in conformity with accounting principles generally accepted in the United States requires management to make certain 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 revenue and expenses during the reporting period. Actual results could differ from those estimates. Real Estate Investment Properties The Company purchases real estate investment properties from time to time and records assets acquired and liabilities assumed, including land, buildings, and intangibles related to in-place leases and customer relationships, based on their fair values. The fair value of buildings generally is determined as if the buildings were vacant upon acquisition and then subsequently leased at market rental rates and considers the present value of all cash flows expected to be generated by the property including an initial lease up period. From time to time the Company may purchase a property for future development purposes. The property may be improved with an existing structure that would be demolished as part of the development. In such cases, the fair value of the building may be determined based only on existing leases and not include estimated cash flows related to future leases. In certain circumstances, such as if the building is vacant and the Company intends to demolish the building in the near term, the entire purchase price will be allocated to land. The Company determines the fair value of above and below market intangibles associated with in-place leases by assessing the net effective rent and remaining term of the lease relative to market terms for similar leases at acquisition taking into consideration the remaining contractual lease period, renewal periods, and the likelihood of the tenant exercising its renewal options. The fair value of a below market lease component is recorded as deferred income and accreted as additional lease revenue over the remaining contractual lease period. If the fair value of the below market lease intangible includes fair value associated with a renewal option, such amounts are not accreted until the renewal option is exercised. If the renewal option is not exercised the value is recognized at that time. The fair value of above market lease intangibles is recorded as a deferred asset and is amortized as a reduction of lease revenue over the remaining contractual lease term. The Company determines the fair value of at-market in-place leases considering the cost of acquiring similar leases, the foregone rents associated with the lease-up period and carrying costs associated with the lease-up period. Intangible assets associated with at-market in-place leases are amortized as additional expense over the remaining contractual lease term. To the extent customer relationship intangibles are present in an acquisition, the fair values of the intangibles are amortized over the lives of the customer relationships. The Company has never recorded a customer relationship intangible asset. Acquisition-related transaction costs are either (a) expensed as incurred when related to business combinations or (b) capitalized to land and/or building when related to asset acquisitions. If there is an event or change in circumstance that indicates a potential impairment in the value of a real estate investment property, the Company prepares an analysis to determine whether the carrying value of the real estate investment property exceeds its estimated fair value. The Company considers both quantitative and qualitative factors including recurring operating losses, significant decreases in occupancy, and significant adverse changes in legal factors and business climate. If impairment indicators are present, the Company compares the projected cash flows of the property over its remaining useful life, on an undiscounted basis, to the carrying value of that property. The Company assesses its undiscounted projected cash flows based upon estimated capitalization rates, historic operating results and market conditions that may affect the property. If the carrying value is greater than the undiscounted projected cash flows, the Company would recognize an impairment loss equivalent to an amount required to adjust the carrying amount to its then estimated fair value. The fair value of any property is sensitive to the actual results of any of the aforementioned estimated factors, either individually or taken as a whole. Should the actual results differ from management’s projections, the valuation could be negatively or positively affected. The Company did not recognize an impairment loss on any of its real estate in 2015 , 2014 , or 2013 . Interest, real estate taxes, development related salary costs and other carrying costs are capitalized on projects under development and construction. Once construction is substantially completed and the assets are placed in service, their rental income, real estate tax expense, property operating expenses (consisting of payroll, repairs and maintenance, utilities, insurance and other property related expenses) and depreciation are included in current operations. Property operating expenses are charged to operations as incurred. Interest expense capitalized totaled $2.2 million , $0.7 million , and $ 0.2 million during 2015 , 2014 , and 2013 , respectively. Commercial development projects are considered substantially complete and available for occupancy upon completion of tenant improvements, but no later than one year from the cessation of major construction activity. Multi-family residential development projects are considered substantially complete and available for occupancy upon receipt of the certificate of occupancy from the appropriate licensing authority. Substantially completed portions of a project are accounted for as separate projects. Depreciation is calculated using the straight-line method and estimated useful lives of generally between 35 and 50 years for base buildings, or a shorter period if management determines that the building has a shorter useful life, and up to 20 years for certain other improvements that extend the useful lives. Leasehold improvements expenditures are capitalized when certain criteria are met, including when the Company supervises construction and will own the improvements. Tenant improvements are amortized, over the shorter of the lives of the related leases or the useful life of the improvement, using the straight-line method. Depreciation expense, which is included in Depreciation and amortization of deferred leasing costs in the Consolidated Statements of Operations, for the years ended December 31, 2015 , 2014 , and 2013 , was $37.7 million , $35.9 million , and $43.2 million , respectively. Repairs and maintenance expense totaled $11.6 million , $11.9 million , and $10.3 million for 2015 , 2014 , and 2013 , respectively, and is included in property operating expenses in the accompanying consolidated financial statements. Deferred Leasing Costs Deferred leasing costs consist of commissions paid to third-party leasing agents, internal direct costs such as employee compensation and payroll-related fringe benefits directly related to time spent performing leasing-related activities for successful commercial leases and amounts attributed to in place leases associated with acquired properties and are amortized, using the straight-line method, over the term of the lease or the remaining term of an acquired lease. Leasing related activities include evaluating the prospective tenant’s financial condition, evaluating and recording guarantees, collateral and other security arrangements, negotiating lease terms, preparing lease documents and closing the transaction. Unamortized deferred costs are charged to expense if the applicable lease is terminated prior to expiration of the initial lease term. Collectively, deferred leasing costs totaled $26.9 million and $26.9 million , net of accumulated amortization of approximately $26.6 million and $21.6 million , as of December 31, 2015 and 2014 , respectively. Amortization expense, which is included in Depreciation and amortization of deferred leasing costs in the Consolidated Statements of Operations, totaled approximately $5.6 million , $5.3 million , and $5.9 million , for the years ended December 31, 2015 , 2014 , and 2013 , respectively. Construction in Progress Construction in progress includes preconstruction and development costs of active projects. Preconstruction costs include legal, zoning and permitting costs and other project carrying costs incurred prior to the commencement of construction. Development costs include direct construction costs and indirect costs incurred subsequent to the start of construction such as architectural, engineering, construction management and carrying costs consisting of interest, real estate taxes and insurance. The following table shows the components of construction in progress. December 31, (in thousands) 2015 2014 Park Van Ness $ 77,245 $ 26,998 Other 6,271 3,263 Total $ 83,516 $ 30,261 Accounts Receivable and Accrued Income Accounts receivable primarily represent amounts currently due from tenants in accordance with the terms of the respective leases. Receivables are reviewed monthly and reserves are established with a charge to current period operations when, in the opinion of management, collection of the receivable is doubtful. Accounts receivable in the accompanying consolidated financial statements are shown net of an allowance for doubtful accounts of $1.3 million and $0.7 million , at December 31, 2015 and 2014 , respectively. (In thousands) Year ended December 31, 2015 2014 2013 Beginning Balance $ 677 $ 572 $ 1,208 Provision for Credit Losses 915 680 968 Charge-offs (329 ) (575 ) (1,604 ) Ending Balance $ 1,263 $ 677 $ 572 In addition to rents due currently, accounts receivable also includes $41.4 million and $38.7 million , at December 31, 2015 and 2014 , respectively, net of allowance for doubtful accounts totaling $0.5 million and $0.3 million , respectively, representing minimum rental income accrued on a straight-line basis to be paid by tenants over the remaining term of their respective leases. Assets Held for Sale The Company considers properties to be assets held for sale when all of the following criteria are met: • management commits to a plan to sell a property; • it is unlikely that the disposal plan will be significantly modified or discontinued; • the property is available for immediate sale in its present condition; • actions required to complete the sale of the property have been initiated; • sale of the property is probable and the Company expects the completed sale will occur within one year; and • the property is actively being marketed for sale at a price that is reasonable given its current market value. The Company must make a determination as to the point in time that it is probable that a sale will be consummated, which generally occurs when an executed sales contract has no contingencies and the prospective buyer has significant funds at risk to ensure performance. Upon designation as an asset held for sale, the Company records the carrying value of each property at the lower of its carrying value or its estimated fair value, less estimated costs to sell, and ceases depreciation. As of December 31, 2015 , the Company has classified as held-for-sale one operating property, comprising 197,127 square feet of gross leasable area. The book value of this property, which is included in Other Assets, was $3.4 million , net of accumulated depreciation of $7.0 million , which does not exceed its estimated fair value, less costs to sell, and liabilities were $0.2 million . Fair value was determined based on a third party appraisal. Cash and Cash Equivalents Cash and cash equivalents include short-term investments. Short-term investments include money market accounts and other investments which generally mature within three months, measured from the acquisition date, and/or are readily convertible to cash. Substantially all of the Company’s cash balances at December 31, 2015 are held in non-interest bearing accounts at various banks. From time to time the Company may maintain deposits with financial institutions in amounts in excess of federally insured limits. The Company has not experienced any losses on such deposits and believes it is not exposed to any significant credit risk on those deposits. Deferred Debt Costs Deferred debt costs consist of fees and costs incurred to obtain long-term financing, construction financing and the revolving line of credit. These fees and costs are being amortized on a straight-line basis over the terms of the respective loans or agreements, which approximates the effective interest method. Deferred debt costs totaled $8.7 million and $9.9 million , net of accumulated amortization of $6.2 million and $5.9 million at December 31, 2015 and 2014 , respectively. Deferred Income Deferred income consists of payments received from tenants prior to the time they are earned and recognized by the Company as revenue, including tenant prepayment of rent for future periods, real estate taxes when the taxing jurisdiction has a fiscal year differing from the calendar year reimbursements specified in the lease agreement and tenant construction work provided by the Company. In addition, deferred income includes the fair value of certain below market leases. Derivative Financial Instruments The Company may, when appropriate, employ derivative instruments, such as interest-rate swaps, to mitigate the risk of interest rate fluctuations. The Company does not enter into derivative or other financial instruments for trading or speculative purposes. Derivative financial instruments are carried at fair value as either assets or liabilities on the consolidated balance sheets. For those derivative instruments that qualify, the Company may designate the hedging instrument, based upon the exposure being hedged, as a fair value hedge or a cash flow hedge. Derivative instruments that are designated as a hedge are evaluated to ensure they continue to qualify for hedge accounting. The effective portion of any gain or loss on the hedge instruments is reported as a component of accumulated other comprehensive income (loss) and recognized in earnings within the same line item associated with the forecasted transaction in the same period or periods during which the hedged transaction affects earnings. Any ineffective portion of the change in fair value of a derivative instrument is immediately recognized in earnings. For derivative instruments that do not meet the criteria for hedge accounting, or that qualify and are not designated, changes in fair value are immediately recognized in earnings. Revenue Recognition Rental and interest income are accrued as earned except when doubt exists as to collectability, in which case the accrual is discontinued. Recognition of rental income commences when control of the space has been given to the tenant. When rental payments due under leases vary from a straight-line basis because of free rent periods or stepped increases, income is recognized on a straight-line basis. Expense recoveries represent a portion of property operating expenses billed to the tenants, including common area maintenance, real estate taxes and other recoverable costs. Expense recoveries are recognized in the period in which the expenses are incurred. Rental income based on a tenant’s revenue (“percentage rent”) is accrued when a tenant reports sales that exceed a specified breakpoint, pursuant to the terms of their respective leases. Income Taxes The Company made an election to be treated, and intends to continue operating so as to qualify, as a REIT under the Code, commencing with its taxable year ended December 31, 1993 . A REIT generally will not be subject to federal income taxation, provided that distributions to its stockholders equal or exceed its REIT taxable income and complies with certain other requirements. Therefore, no provision has been made for federal income taxes in the accompanying consolidated financial statements. As of December 31, 2015 , the Company had no material unrecognized tax benefits and there exist no potentially significant unrecognized tax benefits which are reasonably expected to occur within the next twelve months. The Company recognizes penalties and interest accrued related to unrecognized tax benefits, if any, as general and administrative expense. No penalties and interest have been accrued in years 2015 , 2014 , and 2013 . The tax basis of the Company’s real estate investments was approximately $1.1 billion and $1.2 billion as of December 31, 2015 and 2014 , respectively. With few exceptions, the Company is no longer subject to U.S. federal, state, and local tax examinations by tax authorities for years before 2012. Stock Based Employee Compensation, Deferred Compensation and Stock Plan for Directors The Company uses the fair value method to value and account for employee stock options. The fair value of options granted is determined at the time of each award using the Black-Scholes model, a widely used method for valuing stock based employee compensation, and the following assumptions: (1) Expected Volatility determined using the most recent trading history of the Company’s common stock (month-end closing prices) corresponding to the average expected term of the options; (2) Average Expected Term of the options is based on prior exercise history, scheduled vesting and the expiration date; (3) Expected Dividend Yield determined by management after considering the Company’s current and historic dividend yield rates, the Company’s yield in relation to other retail REITs and the Company’s market yield at the grant date; and (4) a Risk-free Interest Rate based upon the market yields of US Treasury obligations with maturities corresponding to the average expected term of the options at the grant date. The Company amortizes the value of options granted ratably over the vesting period and includes the amounts as compensation in general and administrative expenses. The Company has a stock plan, which was originally approved in 2004, amended in 2008 and 2013 and which expires in 2023, for the purpose of attracting and retaining executive officers, directors and other key personnel (the "Stock Plan"). Pursuant to the Stock Plan, the Compensation Committee established a Deferred Compensation Plan for Directors for the benefit of its directors and their beneficiaries, which replaced a previous Deferred Compensation and Stock Plan for Directors. A director may make an annual election to defer all or part of his or her director’s fees and has the option to have the fees paid in cash, in shares of common stock or in a combination of cash and shares of common stock upon separation from the Board. If the director elects to have fees paid in stock, fees earned during a calendar quarter are aggregated and divided by the common stock’s closing market price on the first trading day of the following quarter to determine the number of shares to be allocated to the director. As of December 31, 2015 , the directors’ deferred fee accounts comprise 241,949 shares. The Compensation Committee has also approved an annual award of shares of the Company’s common stock as additional compensation to each director serving on the Board of Directors as of the record date for the Annual Meeting of Stockholders. The shares are awarded as of each Annual Meeting of Shareholders, and their issuance may not be deferred. Each director was issued 200 shares for each of the years ended December 31, 2015 , 2014 , and 2013 . The shares were valued at the closing stock price on the dates the shares were awarded and included in general and administrative expenses in the total amounts of $143,000 , $112,900 , and $124,400 , for the years ended December 31, 2015 , 2014 , and 2013 , respectively. Noncontrolling Interest Saul Centers is the sole general partner of the Operating Partnership, owning a 74.2% common interest as of December 31, 2015 . Noncontrolling interest in the Operating Partnership is comprised of limited partnership units owned by the Saul Organization. Noncontrolling interest reflected on the accompanying consolidated balance sheets is increased for earnings allocated to limited partnership interests and distributions reinvested in additional units, and is decreased for limited partner distributions. Noncontrolling interest reflected on the consolidated statements of operations represents earnings allocated to limited partnership interests held by the Saul Organization. Per Share Data Per share data for net income (basic and diluted) is computed using weighted average shares of common stock. Convertible limited partnership units and employee stock options are the Company’s potentially dilutive securities. For all periods presented, the convertible limited partnership units are anti-dilutive. The treasury stock method was used to measure the effect of the dilution. December 31, (Shares in thousands) 2015 2014 2013 Weighted average common shares outstanding - Basic 21,127 20,772 20,364 Effect of dilutive options 69 49 37 Weighted average common shares outstanding - Diluted 21,196 20,821 20,401 Average share price $ 53.38 $ 49.09 $ 45.44 Non-dilutive options 111 107 113 Years non-dilutive options were issued 2007 and 2015 2007 and 2008 2007 and 2008 Legal Contingencies The Company is subject to various legal proceedings and claims that arise in the ordinary course of business, which are generally covered by insurance. Upon determination that a loss is probable to occur and can be reasonably estimated, the estimated amount of the loss is recorded in the financial statements. Recently Issued Accounting Standards In April 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2014-08, “Presentation of Financial Statements (Topic 205) and Property Plant and Equipment (Topic 360)” (“ASU 2014-08”). ASU 2014-08 changes the requirements for reporting discontinued operations such that disposals of components of an entity will be reported in discontinued operations if the disposal represents a strategic shift that has (or will have) a major effect on an entity’s operations. ASU 2014-08 also requires additional disclosures about discontinued operations. ASU 2014-08 is effective for annual periods beginning after December 15, 2014, and interim periods within those years and early adoption is permitted. The Company retrospectively adopted ASU 2014-08 on April 15, 2014. The adoption of ASU 2014-08 did not have a material impact on the Company’s financial condition or results of operations. In May 2014, the FASB issued ASU No. 2014-09, “Revenue from Contracts with Customers” (“ASU 2014-09”). ASU 2014-09 will replace most existing revenue recognition guidance and will require an entity to recognize the amount of revenue to which it expects to be entitled for the transfer of promised goods or services to customers. ASU 2014-09 is effective for annual periods beginning after December 15, 2016, and interim periods within those years and early adoption is not permitted. ASU 2014-09 must be applied retrospectively by either restating prior periods or by recognizing the cumulative effect as of the first date of application. We have not yet selected a transition method and are evaluating the impact that ASU 2014-09 will have on our consolidated financial statements and related disclosures. In April 2015, the FASB issued ASU No. 2015-03, “Interest - Imputation of Interest” (“ASU 2015-03”). ASU 2015-03 simplifies the presentation of debt issuance costs and will require an entity to deduct transaction costs from the carrying value of the related financial liability and not record those transaction costs as a separate asset. Recognition and measurement guidance for debt issuance costs are not affected by ASU 2015-03. ASU 2015-03 is effective for annual periods beginning after December 15, 2015, and interim periods within those years, and must be applied retrospectively by adjusting the balance sheet of each individual period presented. Adoption of ASU 2015-03 is not expected to have a material effect on our consolidated financial statements and related disclosures. In February 2016, the FASB issued ASU 2016-02, ‘‘Leases’’ (“ASU 2016-02”). ASU 2016-02 amends the existing accounting standards for lease accounting, including requiring lessees to recognize most leases on their balance sheets and making targeted changes to lessor accounting. ASU 2016-02 is effective for annual periods beginning after December 15, 2018, interim periods within those years, and requires a modified retrospective transition approach for all leases existing at the date of initial application, with an option to use certain practical expedients for those existing leases. We are evaluating the impact that ASU 2016-02 will have on our consolidated financial statements and related disclosures. Reclassifications Certain reclassifications have been made to prior years to conform to the presentation used for year ended December 31, 2015 .

Real Estate Acquired

Real Estate Acquired	12 Months Ended
	Dec. 31, 2015
Real Estate [Abstract]
Real Estate Acquired	REAL ESTATE ACQUIRED 1580, 1582 and 1584 Rockville Pike In January 2014, the Company purchased for $8.0 million 1580 Rockville Pike and incurred acquisition costs of $0.2 million . In April 2014, the Company purchased for $11.0 million 1582 Rockville Pike and incurred acquisition costs of $0.2 million . In December 2014, the company purchased for $6.2 million 1584 Rockville Pike and incurred acquisition costs of $0.2 million . These retail properties are contiguous with each other and the Company's property at 1500 Rockville Pike and are located in Rockville, Maryland. 726, 730 and 750 N. Glebe Road In August 2014, the Company purchased for $40.0 million , 750 N. Glebe Road and incurred acquisition costs of $0.4 million . In December 2014, the Company purchased for $2.8 million 730 N. Glebe Road and incurred acquisition costs of $40,400 . In September 2015, the Company purchased for $4.0 million 726 N. Glebe Road and incurred acquisition costs of $0.1 million . These retail properties are contiguous and are located in Arlington, Virginia. Kentlands pad In August 2013 , the Company purchased for $4.3 million , a retail pad with a 7,100 square foot restaurant located in Gaithersburg, Maryland , which is contiguous with and an expansion of the Company's other Kentlands assets, and incurred acquisition costs of $0.1 million . Hunt Club pad In December 2013, the Company purchased for $0.8 million , including acquisition costs, a retail pad with a 5,500 square foot vacant building located in Apopka, Florida, which is contiguous with and an expansion of the Company's other Hunt Club asset. Westview pad In February 2015 , the Company purchased for $0.9 million including acquisition costs, a 1.1 acre retail pad site in Frederick, Maryland, which is contiguous with and an expansion of the Company's other Westview asset. Allocation of Purchase Price of Real Estate Acquired The Company allocates the purchase price of real estate investment properties to various components, such as land, buildings and intangibles related to in-place leases and customer relationships, based on their fair values. See Note 2. Summary of Significant Accounting Policies-Real Estate Investment Properties. During 2015, the Company purchased one property at a cost of $4.0 million and incurred acquisition costs of $0.1 million . Of the total purchase price, $3.9 million was allocated to land and $0.1 million was allocated to building. No amounts were allocated to in-place, above-market or below-market leases. During 2014, the Company purchased five properties at an aggregate cost of $68.0 million , and incurred acquisition costs of $0.9 million . The purchase prices were allocated to the assets acquired and liabilities assumed based on their fair value as shown in the following table. (in thousands) 1580 Rockville Pike 1582 Rockville Pike 750 N. Glebe Road 730 N. Glebe Road 1584 Rockville Pike Total Land $ 9,600 $ 9,742 $ 38,224 $ 2,683 $ 5,798 $ 66,047 Buildings 2,200 828 1,327 78 440 4,873 In-place Leases 513 849 449 39 249 2,099 Above Market Rent — — — — — — Below Market Rent (4,313 ) (419 ) — — (337 ) (5,069 ) Total Purchase Price $ 8,000 $ 11,000 $ 40,000 $ 2,800 $ 6,150 $ 67,950 During 2013, the Company purchased two properties at a cost of $5.1 million and incurred acquisition costs of $106,000 . Of the total purchase price, $2.0 million was allocated to buildings and $3.1 million was allocated to land. No amounts were allocated to in-place, above-market, or below-market leases. The gross carrying amount of lease intangible assets included in deferred leasing costs as of December 31, 2015 and 2014 was $24.0 million and $24.0 million , respectively, and accumulated amortization was $19.2 million and $18.0 million , respectively. Amortization expense totaled $1.3 million , $1.3 million and $2.0 million , for the years ended December 31, 2015 , 2014 , and 2013 , respectively. The gross carrying amount of below market lease intangible liabilities included in deferred income as of December 31, 2015 and 2014 was $29.9 million and $29.9 million , respectively, and accumulated amortization was $13.7 million and $11.9 million , respectively. Accretion income totaled $1.8 million , $1.9 million , and $1.7 million , for the years ended December 31, 2015 , 2014 , and 2013 , respectively. The gross carrying amount of above market lease intangible assets included in accounts receivable as of December 31, 2015 and 2014 was $1.0 million and $1.0 million , respectively, and accumulated amortization was $998,200 and $996,700 , respectively. Amortization expense totaled $2,000 , $23,000 and $45,000 , for the years ended December 31, 2015 , 2014 and 2013 , respectively. As of December 31, 2015 , scheduled amortization of intangible assets and deferred income related to in place leases is as follows: (In thousands) Lease acquisition costs Above market leases Below market leases 2016 $ 988 $ 2 $ 1,719 2017 796 1 1,697 2018 737 1 1,615 2019 550 — 1,478 2020 417 — 1,397 Thereafter 1,322 — 8,236 Total $ 4,810 $ 4 $ 16,142

Noncontrolling Interests - Hold

Noncontrolling Interests - Holders of Convertible Limited Partnership Units in the Operating Partnership	12 Months Ended
	Dec. 31, 2015
Noncontrolling Interest [Abstract]
Noncontrolling Interests - Holders of Convertible Limited Partnership Units in the Operating Partnership	NONCONTROLLING INTERESTS - HOLDERS OF CONVERTIBLE LIMITED PARTNERSHIP UNITS IN THE OPERATING PARTNERSHIP The Saul Organization holds a 25.8% limited partnership interest in the Operating Partnership represented by 7,305,758 limited partnership units, as of December 31, 2015 . The units are convertible into shares of Saul Centers’ common stock, at the option of the unit holder, on a one -for-one basis provided that, in accordance with the Saul Centers, Inc. Articles of Incorporation, the rights may not be exercised at any time that the Saul Organization beneficially owns, directly or indirectly, in the aggregate more than 39.9% of the value of the outstanding common stock and preferred stock of Saul Centers (the “Equity Securities”). As of December 31, 2015 , 1,040,000 units were eligible for conversion. The impact of the Saul Organization’s 25.8% limited partnership interest in the Operating Partnership is reflected as Noncontrolling Interests in the accompanying consolidated financial statements. Fully converted partnership units and diluted weighted average shares outstanding for the years ended December 31, 2015 , 2014 , and 2013 , were 28,449,400 , 27,977,500 , and 27,330,100 , respectively.

Mortgage Notes Payable, Revolvi

Mortgage Notes Payable, Revolving Credit Facility, Interest Expense and Amortization of Deferred Debt Costs	12 Months Ended
	Dec. 31, 2015
Debt Disclosure [Abstract]
Mortgage Notes Payable, Revolving Credit Facility, Interest Expense and Amortization of Deferred Debt Costs	MORTGAGE NOTES PAYABLE, REVOLVING CREDIT FACILITY, INTEREST EXPENSE AND AMORTIZATION OF DEFERRED DEBT COSTS At December 31, 2015 , outstanding debt totaled $875.2 million , of which $832.4 million was fixed rate debt and $42.8 million was variable rate debt. The Company’s outstanding debt totaled $857.4 million at December 31, 2014 , of which $784.8 million was fixed rate debt and $72.6 million was variable rate debt. At December 31, 2015 , the Company had a $275.0 million unsecured revolving credit facility, which can be used for working capital, property acquisitions or development projects. The revolving credit facility matures on June 23, 2018, and may be extended by the Company for one additional year subject to the Company’s satisfaction of certain conditions. Saul Centers and certain consolidated subsidiaries of the Operating Partnership have guaranteed the payment obligations of the Operating Partnership under the revolving credit facility. Letters of credit may be issued under the revolving credit facility. On December 31, 2015 , based on the value of the Company's unencumbered properties, approximately $246.6 million was available under the line, $28.0 million was outstanding and approximately $448,000 was committed for letters of credit. The interest rate under the facility is variable and equals the sum of one-month LIBOR and a margin that is based on the Company’s leverage ratio and which can range from 145 basis points to 200 basis points. As of December 31, 2015 , the margin was 145 basis points. Saul Centers is a guarantor of the revolving credit facility, of which the Operating Partnership is the borrower, the Metro Pike Center bank loan (approximately $7.8 million of the $14.8 million outstanding at December 31, 2015 ) and all of the Park Van Ness construction-to-permanent loan. All other notes payable are non-recourse. On February 27, 2013 , the Company closed on a three -year $15.6 million mortgage loan secured by Metro Pike Center. The loan matures in 2017 , bears interest at a variable rate equal to the sum of one-month LIBOR and 165 basis points , requires monthly principal and interest payments based on a 25 -year amortization schedule and requires a final payment of $14.8 million at maturity. The loan may be extended for one additional year. Proceeds were used to pay-off the $15.9 million remaining balance of existing debt secured by Metro Pike Center, and to extinguish the related swap agreement. On February 27, 2013 , the Company closed on a three -year $15.0 million mortgage loan secured by Northrock. The loan was originally scheduled to mature in 2016 and was refinanced in 2015. The loan bore interest at a variable rate equal to the sum of one-month LIBOR and 165 basis points , required monthly principal and interest payments based on a 25 -year amortization schedule and required a final payment of $14.2 million at maturity. Proceeds were used to pay-off the $15.0 million remaining balance of existing debt secured by Northrock. On March 19, 2013 , the Company closed on a 15 -year, non-recourse $18.0 million mortgage loan secured by Hampshire Langley. The loan matures in 2028 , bears interest at a fixed rate of 4.04% , requires monthly principal and interest payments totaling $95,400 based on a 25 -year amortization schedule and requires a final payment of $9.5 million at maturity. On April 10, 2013 , the Company paid in full the $6.9 million remaining balance on the mortgage loan secured by Cruse Marketplace. On May 28, 2013 , the Company closed on a 15 -year, non-recourse $35.0 million mortgage loan secured by Beacon Center. The loan matures in 2028 , bears interest at a fixed rate of 3.51% , requires monthly principal and interest payments totaling $203,200 based on a 20 -year amortization schedule and requires a final payment of $11.4 million at maturity. On September 4, 2013 , the Company closed on a 15 -year, non-recourse $18.0 million mortgage loan secured by Seabreeze Plaza. The loan matures in 2028 , bears interest at a fixed rate of 3.99% , requires monthly principal and interest payments totaling $94,900 based on a 25 -year amortization schedule and requires a final payment of $9.5 million at maturity. Proceeds were used to pay off the $13.5 million remaining balance of existing debt secured by Seabreeze Plaza which was scheduled to mature in May 2014 and the Company incurred $497,000 of related debt extinguishment costs. On October 25, 2013 the Company closed on a $71.6 million construction-to-permanent loan which will partially finance the construction of Park Van Ness. The loan bears interest at 4.88% and during the construction period it will be fully recourse to Saul Centers and accrued interest will be funded by the loan. Following the completion of construction and lease-up, and upon achieving certain debt service coverage requirements, the loan will convert to a non-recourse, permanent mortgage at the same interest rate, with principal amortization computed based on a 25 -year schedule. On June 24, 2014, the Company amended and restated its revolving credit facility. The Company unsecured revolving credit facility, which can be used for working capital, property acquisitions, development projects or letters of credit was increased to $275.0 million . The revolving credit facility matures on June 23, 2018 , and may be extended by the Company for one additional year subject to the Company’s satisfaction of certain conditions. Saul Centers and certain consolidated subsidiaries of the Operating Partnership have guaranteed the payment obligations of the Operating Partnership under the revolving credit facility. Letters of credit may be issued under the revolving credit facility. The interest rate under the facility is variable and equals the sum of one-month LIBOR and a margin that is based on the Company’s leverage ratio, and which can range from 145 basis points to 200 basis points. On March 3, 2015 , the Company closed on a 15 -year, non-recourse $30.0 million mortgage loan secured by Shops at Fairfax and Boulevard. The loan matures in 2030 , bears interest at a fixed rate of 3.69% , requires monthly principal and interest payments totaling $153,300 based on a 25 -year amortization schedule and requires a final payment of $15.5 million at maturity. Proceeds were used to repay in full the $15.2 million remaining balance of existing debt secured by Shops at Fairfax and Boulevard and to reduce outstanding borrowings under the revolving credit facility. On April 1, 2015 , the Company closed on a 15 -year, non-recourse $16.0 million mortgage loan secured by Northrock. The loan matures in 2030 , bears interest at a fixed rate of 3.99% , requires monthly principal and interest payments totaling $84,400 based on a 25 -year amortization schedule and requires a final payment of $8.4 million at maturity. Proceeds were used to repay in full the $14.5 million remaining balance of existing debt secured by Northrock. The following is a summary of notes payable as of December 31, 2015 and 2014 . Notes Payable December 31, Interest Scheduled (Dollars in thousands) 2015 2014 Rate * Maturity * Fixed rate mortgages: $ — (a) $ 15,399 7.45 % Jun-2015 30,778 (b) 32,049 6.01 % Feb-2018 33,766 (c) 35,398 5.88 % Jan-2019 10,928 (d) 11,454 5.76 % May-2019 15,098 (e) 15,819 5.62 % Jul-2019 15,064 (f) 15,761 5.79 % Sep-2019 13,387 (g) 14,014 5.22 % Jan-2020 10,587 (h) 10,881 5.60 % May-2020 9,127 (i) 9,535 5.30 % Jun-2020 40,360 (j) 41,441 5.83 % Jul-2020 8,025 (k) 8,346 5.81 % Feb-2021 5,959 (l) 6,100 6.01 % Aug-2021 34,420 (m) 35,222 5.62 % Jun-2022 10,492 (n) 10,718 6.08 % Sep-2022 11,365 (o) 11,587 6.43 % Apr-2023 14,177 (p) 14,909 6.28 % Feb-2024 16,348 (q) 16,750 7.35 % Jun-2024 14,197 (r) 14,535 7.60 % Jun-2024 25,088 (s) 25,639 7.02 % Jul-2024 29,714 (t) 30,429 7.45 % Jul-2024 29,564 (u) 30,253 7.30 % Jan-2025 15,360 (v) 15,735 6.18 % Jan-2026 112,299 (w) 115,291 5.31 % Apr-2026 34,133 (x) 35,125 4.30 % Oct-2026 38,842 (y) 39,932 4.53 % Nov-2026 18,150 (z) 18,645 4.70 % Dec-2026 67,850 (aa) 69,397 5.84 % May-2027 16,826 (bb) 17,281 4.04 % Apr-2028 31,844 (cc) 33,140 3.51 % Jun-2028 17,011 (dd) 17,462 3.99 % Sep-2028 29,444 (ee) — 3.69 % Mar-2030 15,748 (ff) — 3.99 % Apr-2030 45,208 (gg) 5,391 4.88 % Sep-2032 11,282 (hh) 11,119 8.00 % Apr-2034 Total fixed rate 832,441 784,757 5.53 % 9.2 Years Variable rate loans: 28,000 (ii) 43,000 LIBOR + 1.45 % Jun-2018 — (jj) 14,525 LIBOR + 1.65 % Feb-2016 14,801 (kk) 15,106 LIBOR + 1.65 % Feb-2017 Total variable rate $ 42,801 $ 72,631 LIBOR + 1.94 % 2.0 Years Total notes payable $ 875,242 $ 857,388 5.35 % 8.9 Years * Interest rate and scheduled maturity data presented as of December 31, 2015 . Totals computed using weighted averages. (a) The loan was collateralized by Shops at Fairfax and Boulevard shopping centers and required equal monthly principal and interest payments totaling $156,000 based upon a weighted average 23 -year amortization schedule and a final payment of $15.2 million was due at loan maturity. In 2015 the loan was repaid in full and replaced with a new $ 30.0 million loan. See (ee) below. (b) The loan is collateralized by Washington Square and requires equal monthly principal and interest payments of $264,000 based upon a 27.5 -year amortization schedule and a final payment of $28.0 million at loan maturity. Principal of $1.3 million was amortized during 2015 . (c) The loan is collateralized by three shopping centers, Broadlands Village, The Glen and Kentlands Square I, and requires equal monthly principal and interest payments of $306,000 based upon a 25 -year amortization schedule and a final payment of $28.4 million at loan maturity. Principal of $1.6 million was amortized during 2015 . (d) The loan is collateralized by Olde Forte Village and requires equal monthly principal and interest payments of $98,000 based upon a 25 -year amortization schedule and a final payment of $9.0 million at loan maturity. Principal of $526,000 was amortized during 2015 . (e) The loan is collateralized by Countryside and requires equal monthly principal and interest payments of $133,000 based upon a 25 -year amortization schedule and a final payment of $12.3 million at loan maturity. Principal of $721,000 was amortized during 2015 . (f) The loan is collateralized by Briggs Chaney MarketPlace and requires equal monthly principal and interest payments of $133,000 based upon a 25 -year amortization schedule and a final payment of $12.2 million at loan maturity. Principal of $697,000 was amortized during 2015 . (g) The loan is collateralized by Shops at Monocacy and requires equal monthly principal and interest payments of $112,000 based upon a 25 -year amortization schedule and a final payment of $10.6 million at loan maturity. Principal of $627,000 was amortized during 2015 . (h) The loan is collateralized by Boca Valley Plaza and requires equal monthly principal and interest payments of $75,000 based upon a 30 -year amortization schedule and a final payment of $9.1 million at loan maturity. Principal of $294,000 was amortized during 2015 . (i) The loan is collateralized by Palm Springs Center and requires equal monthly principal and interest payments of $75,000 based upon a 25 -year amortization schedule and a final payment of $7.1 million at loan maturity. Principal of $408,000 was amortized during 2015 . (j) The loan and a corresponding interest-rate swap closed on June 29, 2010 and are collateralized by Thruway. On a combined basis, the loan and the interest-rate swap require equal monthly principal and interest payments of $289,000 based upon a 25 -year amortization schedule and a final payment of $34.8 million at loan maturity. Principal of $1,081,000 was amortized during 2015 . (k) The loan is collateralized by Jamestown Place and requires equal monthly principal and interest payments of $66,000 based upon a 25 -year amortization schedule and a final payment of $6.1 million at loan maturity. Principal of $321,000 was amortized during 2015 . (l) The loan is collateralized by Hunt Club Corners and requires equal monthly principal and interest payments of $42,000 based upon a 30 -year amortization schedule and a final payment of $5.0 million , at loan maturity. Principal of $141,000 was amortized during 2015 . (m) The loan is collateralized by Lansdowne Town Center and requires monthly principal and interest payments of $230,000 based on a 30 -year amortization schedule and a final payment of $28.2 million at loan maturity. Principal of $802,000 was amortized during 2015 . (n) The loan is collateralized by Orchard Park and requires equal monthly principal and interest payments of $73,000 based upon a 30 -year amortization schedule and a final payment of $8.6 million at loan maturity. Principal of $226,000 was amortized during 2015 . (o) The loan is collateralized by BJ’s Wholesale and requires equal monthly principal and interest payments of $80,000 based upon a 30 -year amortization schedule and a final payment of $9.3 million at loan maturity. Principal of $222,000 was amortized during 2015 . (p) The loan is collateralized by Great Falls shopping center. The loan consists of three notes which require equal monthly principal and interest payments of $138,000 based upon a weighted average 26 -year amortization schedule and a final payment of $6.3 million at maturity. Principal of $732,000 was amortized during 2015 . (q) The loan is collateralized by Leesburg Pike and requires equal monthly principal and interest payments of $135,000 based upon a 25 -year amortization schedule and a final payment of $11.5 million at loan maturity. Principal of $402,000 was amortized during 2015 . (r) The loan is collateralized by Village Center and requires equal monthly principal and interest payments of $119,000 based upon a 25 -year amortization schedule and a final payment of $10.1 million at loan maturity. Principal of $338,000 was amortized during 2015 . (s) The loan is collateralized by White Oak and requires equal monthly principal and interest payments of $193,000 based upon a 24.4 year weighted amortization schedule and a final payment of $18.5 million at loan maturity. The loan was previously collateralized by Van Ness Square. During 2012, the Company substituted White Oak as the collateral and borrowed an additional $10.5 million . Principal of $551,000 was amortized during 2015 . (t) The loan is collateralized by Avenel Business Park and requires equal monthly principal and interest payments of $246,000 based upon a 25 -year amortization schedule and a final payment of $20.9 million at loan maturity. Principal of $715,000 was amortized during 2015 . (u) The loan is collateralized by Ashburn Village and requires equal monthly principal and interest payments of $240,000 based upon a 25 -year amortization schedule and a final payment of $20.5 million at loan maturity. Principal of $689,000 was amortized during 2015 . (v) The loan is collateralized by Ravenwood and requires equal monthly principal and interest payments of $111,000 based upon a 25 -year amortization schedule and a final payment of $10.1 million at loan maturity. Principal of $375,000 was amortized during 2015 . (w) The loan is collateralized by Clarendon Center and requires equal monthly principal and interest payments of $753,000 based upon a 25 -year amortization schedule and a final payment of $70.5 million at loan maturity. Principal of $3.0 million was amortized during 2015 . (x) The loan is collateralized by Severna Park MarketPlace and requires equal monthly principal and interest payments of $207,000 based upon a 25 -year amortization schedule and a final payment of $20.3 million at loan maturity. Principal of $992,000 was amortized during 2015 . (y) The loan is collateralized by Kentlands Square II and requires equal monthly principal and interest payments of $240,000 based upon a 25 -year amortization schedule and a final payment of $23.1 million at loan maturity. Principal of $1,090,000 was amortized during 2015 . (z) The loan is collateralized by Cranberry Square and requires equal monthly principal and interest payments of $113,000 based upon a 25 -year amortization schedule and a final payment of $10.9 million at loan maturity. Principal of $495,000 was amortized during 2015 . (aa) The loan in the original amount of $73.0 million closed in May 2012, is collateralized by Seven Corners and requires equal monthly principal and interest payments of $463,200 based upon a 25 -year amortization schedule and a final payment of $42.3 million at loan maturity. Principal of $1.5 million was amortized during 2015 . (bb) The loan is collateralized by Hampshire Langley and requires equal monthly principal and interest payments of $95,400 based upon a 25 -year amortization schedule and a final payment of $9.5 million at loan maturity. Principal of $455,000 was amortized in 2015 . (cc) The loan is collateralized by Beacon Center and requires equal monthly principal and interest payments of $203,200 based upon a 20 -year amortization schedule and a final payment of $11.4 million at loan maturity. Principal of $1,296,000 was amortized in 2015 . (dd) The loan is collateralized by Seabreeze Plaza and requires equal monthly principal and interest payments of $94,900 based upon a 25 -year amortization schedule and a final payment of $9.5 million at loan maturity. Principal of $451,000 was amortized in 2015 . (ee) The loan is collateralized by Shops at Fairfax and Boulevard shopping centers and requires equal monthly principal and interest payments totaling $153,300 based upon a 25 -year amortization schedule and a final payment of $15.5 million at maturity. Principal of $556,000 was amortized in 2015. (ff) The loan is collateralized by Northrock and requires equal monthly principal and interest payments totaling $84,400 based upon a 25 -year amortization schedule and a final payment of $8.4 million at maturity. Principal of $252,000 was amortized in 2015. (gg) The loan is a $71.6 million construction-to-permanent facility that is collateralized by and will finance a portion of the construction costs of Park Van Ness. During the construction period, interest will be funded by the loan. After conversion to a permanent loan, monthly principal and interest payments totaling $413,500 will be required based upon a 25 -year amortization schedule. A final payment of $39.6 million will be due at maturity. (hh) The Company entered into a sale-leaseback transaction with its Olney property and is accounting for that transaction as a secured financing. The arrangement requires monthly payments of $60,400 which increase by 1.5% on May 1, 2015, and every May 1 thereafter. The arrangement provides for a final payment of $14.7 million and has an implicit interest rate of 8.0% . Negative amortization in 2015 totaled $163,000 . (ii) The loan is a $275.0 million unsecured revolving credit facility. Interest accrues at a rate equal to the sum of one-month LIBOR plus a spread of 145 basis points. The line may be extended at the Company’s option for one year with payment of a fee of 0.15% . Monthly payments, if required, are interest only and vary depending upon the amount outstanding and the applicable interest rate for any given month. (jj) The loan was collateralized by Northrock and required monthly principal and interest payments of approximately $47,000 and a final payment of $14.2 million at maturity. In 2015 the loan was repaid in full and replaced with a new $ 16.0 million loan. See (ff) above. (kk) The loan is collateralized by Metro Pike Center and requires monthly principal and interest payments of approximately $48,000 and a final payment of $14.8 million at loan maturity. Principal of $305,000 was amortized during 2015 . The carrying value of the properties collateralizing the mortgage notes payable totaled $856.8 million and $895.5 million , as of December 31, 2015 and 2014 , respectively. The Company’s credit facility requires the Company and its subsidiaries to maintain certain financial covenants, which are summarized below. The Company was in compliance as of December 31, 2015 . • maintain tangible net worth, as defined in the loan agreement, of at least $542.1 million plus 80% of the Company’s net equity proceeds received after March 2014; • limit the amount of debt as a percentage of gross asset value, as defined in the loan agreement, to less than 60% (leverage ratio); • limit the amount of debt so that interest coverage will exceed 2.0 x on a trailing four-quarter basis (interest expense coverage); and • limit the amount of debt so that interest, scheduled principal amortization and preferred dividend coverage exceeds 1.3 x on a trailing four-quarter basis (fixed charge coverage). Mortgage notes payable at each of December 31, 2015 and 2014 , totaling $51.0 million , are guaranteed by members of the Saul Organization. As of December 31, 2015 , the scheduled maturities of all debt including scheduled principal amortization for years ended December 31 are as follows: (in thousands) Balloon Payments Scheduled Principal Amortization Total 2016 $ — $ 24,655 $ 24,655 2017 14,430 25,798 40,228 2018 55,748 (a) 25,903 81,651 2019 60,793 24,616 85,409 2020 61,163 21,893 83,056 Thereafter 432,565 127,678 560,243 $ 624,699 $ 250,543 $ 875,242 (a) Includes $28.0 million outstanding under the line of credit. The components of interest expense are set forth below. (in thousands) Year ended December 31, 2015 2014 2013 Interest incurred $ 45,898 $ 45,396 $ 45,502 Amortization of deferred debt costs 1,433 1,327 1,257 Capitalized interest (2,166 ) (689 ) (170 ) Total $ 45,165 $ 46,034 $ 46,589 Deferred debt costs capitalized during the years ending December 31, 2015 , 2014 and 2013 totaled $0.3 million , $1.3 million and $3.2 million , respectively.

Lease Agreements

Lease Agreements	12 Months Ended
	Dec. 31, 2015
Leases [Abstract]
Lease Agreements	LEASE AGREEMENTS Lease income includes primarily base rent arising from noncancelable leases. Base rent (including straight-line rent) for the years ended December 31, 2015 , 2014 , and 2013 , amounted to $168.3 million , $164.6 million , and $159.9 million , respectively. Future contractual payments under noncancelable leases for years ended December 31 (which exclude the effect of straight-line rents), are as follows: (in thousands) 2016 $ 154,983 2017 140,786 2018 122,922 2019 100,845 2020 80,559 Thereafter 273,328 $ 873,423 The majority of the leases provide for rental increases and expense recoveries based on fixed annual increases or increases in the Consumer Price Index and increases in operating expenses. The expense recoveries generally are payable in equal installments throughout the year based on estimates, with adjustments made in the succeeding year. Expense recoveries for the years ended December 31, 2015 , 2014 , and 2013 , amounted to $32.9 million , $32.1 million , and $30.9 million , respectively. In addition, certain retail leases provide for percentage rent based on sales in excess of the minimum specified in the tenant’s lease. Percentage rent amounted to $1.6 million , $1.5 million , and $1.6 million , for the years ended December 31, 2015 , 2014 , and 2013 , respectively.

Long-Term Lease Obligations

Long-Term Lease Obligations	12 Months Ended
	Dec. 31, 2015
Leases [Abstract]
Long-Term Lease Obligations	LONG-TERM LEASE OBLIGATIONS Certain properties are subject to noncancelable long-term leases which apply to land underlying the Shopping Centers. Certain of the leases provide for periodic adjustments of the base annual rent and require the payment of real estate taxes on the underlying land. The leases will expire between 2058 and 2068 . Reflected in the accompanying consolidated financial statements is minimum ground rent expense of $176,000 , $176,000 , and $176,000 , for the years ended December 31, 2015 , 2014 , and 2013 , respectively. The future minimum rental commitments under these ground leases are as follows: Year ending December 31, (In thousands) 2016 2017 2018 2019 2020 Thereafter Total Beacon Center $ 60 $ 60 $ 60 $ 60 $ 60 $ 2,482 $ 2,782 Olney 56 56 56 57 62 3,697 3,984 Southdale 60 60 60 60 60 2,825 3,125 Total $ 176 $ 176 $ 176 $ 177 $ 182 $ 9,004 $ 9,891 In addition to the above, Flagship Center consists of two developed out parcels that are part of a larger adjacent community shopping center formerly owned by the Saul Organization and sold to an affiliate of a tenant in 1991. The Company has a 90 -year ground leasehold interest which commenced in September 1991 with a minimum rent of one dollar per year. Countryside shopping center was acquired in February 2004. Because of certain land use considerations, approximately 3.4% of the underlying land is held under a 99 -year ground lease. The lease requires the Company to pay minimum rent of one dollar per year as well as its pro-rata share of the real estate taxes. The Company’s corporate headquarters space is leased by a member of the Saul Organization. The lease commenced in March 2002, was extended in 2012 for five years, and provides for base rent increases of 3% per year, with payment of a pro-rata share of operating expenses over a base year amount. The Company and the Saul Organization entered into a Shared Services Agreement whereby each party pays an allocation of total rental payments based on a percentage proportionate to the number of employees employed by each party. The Company’s rent expense for the years ended December 31, 2015 , 2014 , and 2013 was $904,900 , $840,800 , and $850,600 , respectively. Expenses arising from the lease are included in general and administrative expense (see Note 9 – Related Party Transactions).

Stockholders' Equity and Noncon

Stockholders' Equity and Noncontrolling Interest	12 Months Ended
	Dec. 31, 2015
Noncontrolling Interest [Abstract]
Stockholders' Equity and Noncontrolling Interest	STOCKHOLDERS’ EQUITY AND NONCONTROLLING INTEREST The Consolidated Statements of Operations for the years ended December 31, 2015 , 2014 , and 2013 reflect noncontrolling interest of $10.5 million , $11.0 million , and $4.0 million , respectively, representing the Saul Organization’s share of the net income for the year. In November 2003, the Company sold 4,000,000 depositary shares, each representing 1/100th of a share of 8% Series A Cumulative Redeemable Preferred Stock (the "Series A Stock"). The depositary shares are redeemable, in whole or in part at the Company’s option, from time to time, at $25.00 per share. The depositary shares pay an annual dividend of $2.00 per share, equivalent to 8% of the $25.00 per share liquidation preference. The Series A preferred stock has no stated maturity, is not subject to any sinking fund or mandatory redemption and is not convertible into any other securities of the Company. Investors in the depositary shares generally have no voting rights, but will have limited voting rights if the Company fails to pay dividends for six or more quarters (whether or not declared or consecutive) and in certain other events. In March 2013, the Company redeemed 60% of its then-outstanding Series A Stock. In December 2014, the Company redeemed the remaining outstanding Series A Stock. Costs associated with the redemptions were charged against accumulated deficit in the respective periods. In March 2008, the Company sold 3,173,115 depositary shares, each representing 1/100th of a share of 9% Series B Cumulative Redeemable Preferred Stock (the "Series B Stock"). The depositary shares may be redeemed at the Company’s option, on or after March 15, 2013 , in whole or in part, at $25.00 per share. The depositary shares pay an annual dividend of $2.25 per share, equivalent to 9% of the $25.00 per share liquidation preference. The Series B preferred stock has no stated maturity, is not subject to any sinking fund or mandatory redemption and is not convertible into any other securities of the Company. Investors in the depositary shares generally have no voting rights, but will have limited voting rights if the Company fails to pay dividends for six or more quarters (whether or not declared or consecutive) and in certain other events. In March 2013, the Company redeemed all of its Series B Stock. Costs associated with the redemption were charged against accumulated deficit. On February 12, 2013, the Company sold, in an underwritten public offering, 5.6 million depositary shares, each representing 1/100 th of a share of 6.875% Series C Cumulative Redeemable Preferred Stock ("Series C Stock"), and received net cash proceeds of approximately $135.2 million . The depositary shares may be redeemed on or after February 12, 2018 at the Company’s option, in whole or in part, at the $25.00 liquidation preference plus accrued but unpaid dividends. The depositary shares pay an annual dividend of $1.71875 per share, equivalent to 6.875% of the $25.00 liquidation preference. The first dividend was paid on April 15, 2013 and covered the period from February 12, 2013 through March 31, 2013 . The Series C Stock has no stated maturity, is not subject to any sinking fund or mandatory redemption and is not convertible into any other securities of the Company except in connection with certain changes of control or delisting events. Investors in the depositary shares generally have no voting rights, but will have limited voting rights if the Company fails to pay dividends for six or more quarters (whether or not declared or consecutive) and in certain other events. On November 12, 2014 , the Company sold, in an underwritten public offering, 1.6 million depositary shares of Series C Stock and received net cash proceeds of approximately $39.3 million (the "Additional Series C Stock"). The terms of Additional Series C Stock are identical to the Series C Stock.

Related Party Transactions

Related Party Transactions	12 Months Ended
	Dec. 31, 2015
Related Party Transactions [Abstract]
Related Party Transactions	RELATED PARTY TRANSACTIONS The Chairman and Chief Executive Officer, the President and Chief Operating Officer, the Executive Vice President-Chief Legal and Administrative Officer and the Senior Vice President-Chief Accounting Officer of the Company are also officers of various members of the Saul Organization and their management time is shared with the Saul Organization. Their annual compensation is fixed by the Compensation Committee of the Board of Directors, with the exception of the Senior Vice President-Chief Accounting Officer whose share of annual compensation allocated to the Company is determined by the shared services agreement (described below). The Company participates in a multiemployer 401K plan with entities in the Saul Organization which covers those full-time employees who meet the requirements as specified in the plan. Company contributions, which are included in general and administrative expense or property operating expenses in the consolidated statements of operations, at the discretionary amount of up to six percent of the employee’s cash compensation, subject to certain limits, were $400,000 , $379,000 , and $369,000 , for 2015 , 2014 , and 2013 , respectively. All amounts deferred by employees and contributed by the Company are fully vested. The Company also participates in a multiemployer nonqualified deferred compensation plan with entities in the Saul Organization which covers those full-time employees who meet the requirements as specified in the plan. According to the plan, which can be modified or discontinued at any time, participating employees defer 2% of their compensation in excess of a specified amount. For the years ended December 31, 2015 , 2014 , and 2013 , the Company contributed three times the amount deferred by employees. The Company’s expense, included in general and administrative expense, totaled $224,900 , $192,800 , and $191,300 , for the years ended December 31, 2015 , 2014 , and 2013 , respectively. All amounts deferred by employees and the Company are fully vested. The cumulative unfunded liability under this plan was $1.8 million and $1.8 million , at December 31, 2015 and 2014 , respectively, and is included in accounts payable, accrued expenses and other liabilities in the consolidated balance sheets. The Company has entered into a shared services agreement (the “Agreement”) with the Saul Organization that provides for the sharing of certain personnel and ancillary functions such as computer hardware, software, and support services and certain direct and indirect administrative personnel. The method for determining the cost of the shared services is provided for in the Agreement and is based upon head count, estimates of usage or estimates of time incurred, as applicable. Senior management has determined that the final allocations of shared costs are reasonable. The terms of the Agreement and the payments made thereunder are reviewed annually by the Audit Committee of the Board of Directors, which consists entirely of independent directors. Billings by the Saul Organization for the Company’s share of these ancillary costs and expenses for the years ended December 31, 2015 , 2014 , and 2013 , which included rental expense for the Company’s headquarters lease (see Note 7. Long Term Lease Obligations), totaled $8.2 million , $7.4 million , and $6.3 million , respectively. The amounts are expensed when incurred and are primarily reported as general and administrative expenses or capitalized to specific development projects in these consolidated financial statements. As of December 31, 2015 and 2014 , accounts payable, accrued expenses and other liabilities included $655,000 and $543,000 , respectively, representing billings due to the Saul Organization for the Company’s share of these ancillary costs and expenses. The Company has entered into a shared third-party predevelopment cost agreement with the B. F. Saul Real Estate Investment Trust, a member of the Saul Organization (the “Predevelopment Agreement”). The Predevelopment Agreement, which expired on December 31, 2015 and was extended to December 31, 2016, relates to the sharing of third-party predevelopment costs incurred in connection with the planning of the future redevelopment of certain adjacent real estate assets in the Twinbrook area of Rockville, Maryland. The costs will be billed by the third-parties on a pro rata basis based on the acreage owned by each entity and neither party is obligated to advance funds to the other. The B. F. Saul Insurance Agency of Maryland, Inc., a subsidiary of the B. F. Saul Company and a member of the Saul Organization, is a general insurance agency that receives commissions and counter-signature fees in connection with the Company’s insurance program. Such commissions and fees amounted to approximately $443,500 , $427,300 , and $447,300 , for the years ended December 31, 2015 , 2014 , and 2013 , respectively. Effective as of September 4, 2012, the Company entered into a consulting agreement with B. F. Saul III, one of the Company’s former presidents, whereby Mr. Saul III provided certain consulting services to the Company as an independent contractor and was paid at a rate of $60,000 per month. The consulting agreement included certain noncompete, nonsolicitation and nondisclosure covenants, and expired in September 2014. During 2014 and 2013 such consulting fees totaled $495,000 and $720,000 , respectively.

Stock Option Plan

Stock Option Plan	12 Months Ended
	Dec. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock Option Plan	STOCK OPTION PLAN The Company established a stock option plan in 1993 (the “1993 Plan”) for the purpose of attracting and retaining executive officers and other key personnel. The 1993 Plan provides for grants of options to purchase up to 400,000 shares of common stock. The 1993 Plan authorizes the Compensation Committee of the Board of Directors to grant options at an exercise price which may not be less than the market value of the common stock on the date the option is granted. At the annual meeting of the Company’s stockholders in 2004, the stockholders approved the adoption of the 2004 stock plan for the purpose of attracting and retaining executive officers, directors and other key personnel. The 2004 stock plan was subsequently amended by the Company’s stockholders at the 2008 Annual Meeting and further amended at the 2013 Annual Meeting (the “Amended 2004 Plan”). The Amended 2004 Plan, which terminates in 2023, provides for grants of options to purchase up to 2,000,000 shares of common stock as well as grants of up to 200,000 shares of common stock to directors. The Amended 2004 Plan authorizes the Compensation Committee of the Board of Directors to grant options at an exercise price which may not be less than the market value of the common stock on the date the option is granted. Effective May 1, 2006 , the Compensation Committee granted options to purchase 30,000 shares (all nonqualified stock options) to twelve Company directors (the “2006 Options”), which were immediately exercisable and expire on April 30, 2016 . The exercise price of $40.35 per share was the closing market price of the Company’s common stock on the date of the award. Using the Black-Scholes model, the Company determined the total fair value of the 2006 Options to be $143,400 . Because the directors’ options vested immediately, the entire $143,400 was expensed as of the date of grant. No options were granted to the Company’s officers in 2006. Effective April 27, 2007 , the Compensation Committee granted options to purchase 165,000 shares ( 27,560 incentive stock options and 137,440 nonqualified stock options) to thirteen Company officers and twelve Company Directors (the “2007 options”), which expire on April 26, 2017 . The officers’ 2007 Options vest 25% per year over four years and are subject to early expiration upon termination of employment. The directors’ options were immediately exercisable. The exercise price of $54.17 per share was the closing market price of the Company’s common stock on the date of award. Using the Black-Scholes model, the Company determined the total fair value of the 2007 Options to be $1.5 million , of which $1.3 million and $285,300 were the values assigned to the officer options and director options, respectively. Because the directors’ options vested immediately, the entire $285,300 was expensed as of the date of grant. The expense for the officers’ options was recognized as compensation expense monthly during the four years the options vested. Effective April 25, 2008 , the Compensation Committee granted options to purchase 30,000 shares (all nonqualified stock options) to twelve Company directors (the “2008 Options”), which were immediately exercisable and expire on April 24, 2018 . The exercise price of $50.15 per share was the closing market price of the Company’s common stock on the date of the award. Using the Black-Scholes model, the Company determined the total fair value of the 2008 Options to be $254,700 . Because the directors’ options vested immediately, the entire $254,700 was expensed as of the date of grant. No options were granted to the Company’s officers in 2008. Effective April 24, 2009 , the Compensation Committee granted options to purchase 32,500 shares (all nonqualified stock options) to thirteen Company directors (the “2009 Options”), which were immediately exercisable and expire on April 23, 2019 . The exercise price of $32.68 per share was the closing market price of the Company’s common stock on the date of the award. Using the Black-Scholes model, the Company determined the total fair value of the 2009 Options to be $222,950 . Because the directors’ options vested immediately, the entire $222,950 was expensed as of the date of grant. No options were granted to the Company’s officers in 2009. Effective May 7, 2010 , the Compensation Committee granted options to purchase 32,500 shares (all nonqualified stock options) to thirteen Company directors (the “2010 Options”), which were immediately exercisable and expire on May 6, 2020 . The exercise price of $38.76 per share was the closing market price of the Company’s common stock on the date of the award. Using the Black-Scholes model, the Company determined the total fair value of the 2010 Options to be $287,950 . Because the directors’ options vested immediately, the entire $287,950 was expensed as of the date of grant. No options were granted to the Company’s officers in 2010. Effective May 13, 2011 , the Compensation Committee granted options to purchase 195,000 shares ( 65,300 incentive stock options and 129,700 nonqualified stock options) to fifteen Company officers and thirteen Company Directors (the “2011 options”), which expire on May 12, 2021 . The officers’ 2011 Options vest 25% per year over four years and are subject to early expiration upon termination of employment. The directors’ 2011 options were immediately exercisable. The exercise price of $41.82 per share was the closing market price of the Company’s common stock on the date of award. Using the Black-Scholes model, the Company determined the total fair value of the 2011 Options to be $1.6 million , of which $1.3 million and $297,375 were assigned to the officer options and director options, respectively. Because the directors’ options vested immediately, the entire $297,375 was expensed as of the date of grant. The expense for the officers’ options is being recognized as compensation expense monthly during the four years the options vest. Effective May 4, 2012 , the Compensation Committee granted options to purchase 277,500 shares ( 26,157 incentive stock options and 251,343 nonqualified stock options) to fifteen Company officers and fourteen Company Directors (the “2012 options”), which expire on May 3, 2022 . The officers’ 2012 Options vest 25% per year over four years and are subject to early expiration upon termination of employment. The directors’ 2012 Options were immediately exercisable. The exercise price of $39.29 per share was the closing market price of the Company’s common stock on the date of award. Using the Black-Scholes model, the Company determined the total fair value of the 2012 Options to be $1.7 million , of which $1.4 million and $257,250 were assigned to the officer options and director options, respectively. Because the directors’ options vested immediately, the entire $257,250 was expensed as of the date of grant. The expense for the officers’ options is being recognized as compensation expense monthly during the four years the options vest. Effective May 10, 2013 , the Compensation Committee granted options to purchase 237,500 shares ( 35,592 incentive stock options and 201,908 nonqualified stock options) to fifteen Company officers and fourteen Company Directors (the "2013 options"), which expire on May 9, 2023 . The officers' 2013 Options vest 25% per year over four years and are subject to early expiration upon termination of employment. The directors' 2013 options were immediately exercisable. The exercise price of $44.42 per share was the closing market price of the Company's common stock on the date of award. Using the Black-Scholes model, the Company determined the total fair value of the 2013 Options to be $1.5 million , of which $1.3 million and $0.3 million were assigned to the officer options and director options, respectively. Because the directors' options vested immediately, the entire $0.3 million was expensed as of the date of grant. The expense for the officers' options is being recognized as compensation expense monthly during the four years the option was vested. Effective May 9, 2014 , the Compensation Committee granted options to purchase 200,000 shares ( 29,300 incentive stock options and 170,700 nonqualified stock options) to eighteen Company officers and twelve Company Directors (the “2014 options”), which expire on May 8, 2024 . The officers’ 2014 Options vest 25% per year over four years and are subject to early expiration upon termination of employment. The directors’ 2014 Options were immediately exercisable. The exercise price of $47.03 per share was the closing market price of the Company’s common stock on the date of award. Using the Black-Scholes model, the Company determined the total fair value of the 2014 Options to be $1.3 million , of which $1.2 million and $109,500 were assigned to the officer options and director options, respectively. Because the directors’ options vested immediately, the entire $109,500 was expensed as of the date of grant. The expense for the officers’ options is being recognized as compensation expense monthly during the four years the options vest. Effective May 8, 2015 , the Compensation Committee granted options to purchase 225,000 shares ( 33,690 incentive stock options and 191,310 nonqualified stock options) to 19 Company officers and 14 Company Directors (the “2015 options”), which expire on May 7, 2025 . The officers’ 2015 Options vest 25% per year over four years and are subject to early expiration upon termination of employment. The directors’ 2015 Options were immediately exercisable. The exercise price of $51.07 per share was the closing market price of the Company’s common stock on the date of award. Using the Black-Scholes model, the Company determined the total fair value of the 2015 Options to be $1.6 million , of which $1.4 million and $125,300 were assigned to the officer options and director options, respectively. Because the directors’ options vested immediately, the entire $125,300 was expensed as of the date of grant. The expense for the officers’ options is being recognized as compensation expense monthly during the four years the options vest. The following table summarizes the amount and activity of each grant, the total value and variables used in the computation and the amount expensed and included in general and administrative expense in the Consolidated Statements of Operations for the years ended December 31, 2015 , 2014 and 2013 . SAUL CENTERS, INC. (Dollars in thousands, except per share data) Stock options issued Directors Grant date 5/1/2006 4/27/2007 4/25/2008 4/24/2009 5/7/2010 5/13/2011 5/4/2012 5/10/2013 5/9/2014 5/8/2015 Subtotals Total grant 30,000 30,000 30,000 32,500 32,500 32,500 35,000 35,000 30,000 35,000 322,500 Vested 30,000 30,000 30,000 32,500 32,500 32,500 35,000 35,000 30,000 35,000 322,500 Exercised 20,000 5,000 7,500 22,500 15,000 15,000 15,000 12,500 7,500 5,000 125,000 Forfeited 2,500 7,500 7,500 — 2,500 2,500 — — — — 22,500 Exercisable at December 31, 2015 7,500 17,500 15,000 10,000 15,000 15,000 20,000 22,500 22,500 30,000 175,000 Remaining unexercised 7,500 17,500 15,000 10,000 15,000 15,000 20,000 22,500 22,500 30,000 175,000 Exercise price $ 40.35 $ 54.17 $ 50.15 $ 32.68 $ 38.76 $ 41.82 $ 39.29 $ 44.42 $ 47.03 $ 51.07 Volatility 0.206 0.225 0.237 0.344 0.369 0.358 0.348 0.333 0.173 0.166 Expected life (years) 9.0 8.0 7.0 6.0 5.0 5.0 5.0 5.0 5.0 5.0 Assumed yield 5.93 % 4.39 % 4.09 % 4.54 % 4.23 % 4.16 % 4.61 % 4.53 % 4.48 % 4.54 % Risk-free rate 5.11 % 4.65 % 3.49 % 2.19 % 2.17 % 1.86 % 0.78 % 0.82 % 1.63 % 1.50 % Total value at grant date $ 144 $ 285 $ 255 $ 223 $ 288 $ 297 $ 257 $ 278 $ 110 $ 125 $ 2,262 Expensed in previous years 144 285 255 223 288 297 257 — — — 1,749 Expensed in 2013 — — — — — — — 278 — — 278 Expensed in 2014 — — — — — — — — 110 — 110 Expensed in 2015 — — — — — — — — — 125 125 Future expense — — — — — — — — — — — Officers Grant date 4/27/2007 5/13/2011 5/4/2012 5/10/2013 5/9/2014 5/8/2015 Subtotals Grand Totals Total grant 135,000 162,500 242,500 202,500 170,000 190,000 1,102,500 1,425,000 Vested 67,500 118,750 81,875 91,250 42,500 — 401,875 724,375 Exercised 14,097 58,754 40,625 24,375 3,125 — 140,976 265,976 Forfeited 67,500 43,750 135,000 30,000 — — 276,250 298,750 Exercisable at December 31, 2015 53,403 59,996 41,250 66,875 39,375 — 260,899 435,899 Remaining unexercised 53,403 59,996 66,875 148,125 166,875 190,000 685,274 860,274 Exercise price $ 54.17 $ 41.82 $ 39.29 $ 44.42 $ 47.03 $ 51.07 Volatility 0.233 0.330 0.315 0.304 0.306 0.298 Expected life (years) 6.5 8.0 8.0 8.0 7.0 7.0 Assumed yield 4.13 % 4.81 % 5.28 % 5.12 % 4.89 % 4.94 % Risk-free rate 4.61 % 2.75 % 1.49 % 1.49 % 2.17 % 1.89 % Gross value at grant date $ 1,339 $ 1,367 $ 1,518 $ 1,401 $ 1,350 $ 1,585 $ 8,560 $ 10,822 Estimated forfeitures 62 368 890 280 169 142 1,911 1,911 Expensed in previous years 1,277 457 105 — — — 1,839 3,588 Expensed in 2013 — 236 157 209 — — 602 880 Expensed in 2014 — 217 157 284 197 — 855 965 Expensed in 2015 — 89 157 269 295 241 1,051 1,176 Future expense — — 52 359 689 1,202 2,302 2,302 Weighted average term of remaining future expense 2.7 years The table below summarizes the option activity for the years 2015 , 2014 , and 2013 : 2015 2014 2013 Shares Weighted Shares Weighted Shares Weighted Outstanding at January 1 748,208 $ 44.79 753,625 $ 42.55 570,840 $ 41.04 Granted 225,000 51.07 200,000 47.03 237,500 44.42 Exercised (112,934 ) 43.67 (167,917 ) 37.71 (49,715 ) 33.15 Expired/Forfeited — — (37,500 ) 43.56 (5,000 ) 52.16 Outstanding December 31 860,274 46.58 748,208 44.79 753,625 42.55 Exercisable at December 31 435,899 380,708 44.85 413,000 42.42 The intrinsic value of options exercised in 2015 , 2014 , and 2013 , was $1.5 million , $2.0 million and $0.6 million , respectively. The intrinsic value of options outstanding and exercisable at year end 2015 was $4.2 million and $2.8 million , respectively. The intrinsic value measures the difference between the options’ exercise price and the closing share price quoted by the New York Stock Exchange as of the date of measurement. The date of exercise was the measurement date for shares exercised during the period. At December 31, 2015 , the final trading day of calendar 2015 , the closing price of $51.27 per share was used for the calculation of aggregate intrinsic value of options outstanding and exercisable at that date. At December 31, 2015 , 70,903 options issued in 2007 had an exercise price in excess of the market closing price and therefore had no intrinsic value. The weighted average remaining contractual life of the Company’s exercisable and outstanding options at December 31, 2015 are 5.7 and 7.1 years, respectively.

Non-Operating Items

Non-Operating Items	12 Months Ended
	Dec. 31, 2015
Other Income and Expenses [Abstract]
Non-Operating Items	NON-OPERATING ITEMS Gain on casualty settlement in 2013 reflects insurance proceeds received in excess of the carrying value of assets damaged during a hail storm at French Market in 2012. The insurance proceeds funded substantially all of the restoration of the damaged property.

Fair Value of Financial Instrum

Fair Value of Financial Instruments	12 Months Ended
	Dec. 31, 2015
Fair Value Disclosures [Abstract]
Fair Value of Financial Instruments	FAIR VALUE OF FINANCIAL INSTRUMENTS The carrying values of cash and cash equivalents, accounts receivable, accounts payable and accrued expenses are reasonable estimates of their fair value. The aggregate fair value of the notes payable with fixed-rate payment terms was determined using Level 3 data in a discounted cash flow approach, which is based upon management’s estimate of borrowing rates and loan terms currently available to the Company for fixed rate financing, and assuming long term interest rates of approximately 3.75% and 3.65% , would be approximately $832.4 million and $886.4 million as of December 31, 2015 and 2014 , respectively, compared to the carrying value of $892.9 million and $784.8 million at December 31, 2015 and 2014 , respectively. A change in any of the significant inputs may lead to a change in the Company’s fair value measurement of its debt. Effective June 30, 2011, the Company determined that one of its interest-rate swap arrangements was a highly effective hedge of the cash flows under one of its variable-rate mortgage loans and designated the swap as a cash flow hedge of that mortgage. The swap is carried at fair value with changes in fair value recognized either in income or comprehensive income depending on the effectiveness of the swap. The following chart summarizes the changes in fair value of the Company’s swaps for the indicated periods. (Dollars in thousands) Year ended December 31, 2015 2014 2013 Increase (decrease) in fair value: Recognized in earnings $ (10 ) $ (10 ) $ (7 ) Recognized in other comprehensive income 124 (675 ) 2,897 Total $ 114 $ (685 ) $ 2,890 The Company carries its interest rate swaps at fair value. The Company has determined the majority of the inputs used to value its derivative fall within Level 2 of the fair value hierarchy with the exception of the impact of counter-party risk, which was determined using Level 3 inputs and are not significant. Derivative instruments are classified within Level 2 of the fair value hierarchy because their values are determined using third-party pricing models which contain inputs that are derived from observable market data. Where possible, the values produced by the pricing models are verified by the market prices. Valuation models require a variety of inputs, including contractual terms, market prices, yield curves, credit spreads, measure of volatility, and correlations of such inputs. The swap agreement terminates on July 1, 2020 . As of December 31, 2015 , the fair value of the interest-rate swap was approximately $2.9 million and is included in “Accounts payable, accrued expenses and other liabilities” in the consolidated balance sheets. The decrease in value from inception of the swap designated as a cash flow hedge is reflected in “Other Comprehensive Income” in the Consolidated Statements of Comprehensive Income.

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2015
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	COMMITMENTS AND CONTINGENCIES Neither the Company nor the Current Portfolio Properties are subject to any material litigation, nor, to management’s knowledge, is any material litigation currently threatened against the Company, other than routine litigation and administrative proceedings arising in the ordinary course of business. Management believes that these items, individually or in the aggregate, will not have a material adverse impact on the Company or the Current Portfolio Properties.

Distributions

Distributions	12 Months Ended
	Dec. 31, 2015
Equity [Abstract]
Distributions	DISTRIBUTIONS In December 1995, the Company established a Dividend Reinvestment and Stock Purchase Plan (the “Plan”), to allow its stockholders and holders of limited partnership interests an opportunity to buy additional shares of common stock by reinvesting all or a portion of their dividends or distributions. The Plan provides for investing in newly issued shares of common stock at a 3% discount from market price without payment of any brokerage commissions, service charges or other expenses. All expenses of the Plan are paid by the Company. The Operating Partnership also maintains a similar dividend reinvestment plan that mirrors the Plan, which allows holders of limited partnership interests the opportunity to buy either additional limited partnership units or common stock shares of the Company. The Company paid common stock distributions of $1.69 per share in 2015 and $1.56 per share during 2014 and $1.44 per share during 2013 , Series A preferred stock dividends of $2.41 per depositary share during 2014 and $2.00 per depositary share in 2013 , Series B preferred stock dividends of $0.99 per depository share during 2013 , and Series C preferred stock dividends of $1.72 per depositary share during each of 2015 and 2014 and $1.09 per depositary share during 2013. Of the common stock dividends paid, $1.69 per share, $1.56 per share, and $0.96 per share, represented ordinary dividend income in 2015, 2014, and 2013, respectively, and $0.48 per share represented return of capital to the shareholders in 2013. All of the preferred stock dividends paid were considered ordinary dividend income. The following summarizes distributions paid during the years ended December 31, 2015 , 2014 , and 2013 , and includes activity in the Plan as well as limited partnership units issued from the reinvestment of unit distributions: Total Distributions to Dividend Reinvestments (Dollars in thousands, except per share amounts) Preferred Common Limited Common Discounted Limited Partnership Units Issued Average Unit Price Distributions during 2015 October 31 $ 3,094 $ 9,106 $ 3,129 47,313 $ 55.73 28,936 $ 55.73 July 31 3,094 9,081 3,115 56,003 50.30 32,041 50.30 April 30 3,094 9,055 3,104 54,921 50.21 25,264 50.21 January 31 3,093 8,403 2,880 42,975 56.74 20,796 56.74 Total 2015 $ 12,375 $ 35,645 $ 12,228 201,212 107,037 Distributions during 2014 October 31 $ 3,856 $ 8,348 $ 2,879 40,142 $ 52.71 July 31 3,206 8,314 2,879 57,696 46.79 April 30 3,206 8,269 2,838 60,212 44.14 104,831 $ 44.77 January 31 3,206 7,415 2,521 39,588 45.15 91,352 45.80 Total 2014 $ 13,474 $ 32,346 $ 11,117 197,638 196,183 Distributions during 2013 October 31 $ 3,206 $ 7,388 $ 2,489 48,836 $ 46.27 88,309 $ 46.93 July 31 3,206 7,327 2,489 138,019 45.21 April 30 4,364 7,272 2,489 142,839 42.85 January 31 3,785 7,218 2,489 145,468 41.67 Total 2013 $ 14,561 $ 29,205 $ 9,956 475,162 88,309 In December 2015 , the Board of Directors of the Company authorized a distribution of $0.43 per common share payable in January 2016, to holders of record on January 15, 2016 . As a result, $9.1 million was paid to common shareholders on January 29, 2016 . Also, $3.1 million was paid to limited partnership unitholders on January 29, 2016 ( $0.43 per Operating Partnership unit). The Board of Directors authorized preferred stock dividends of $0.4297 per Series C depositary share to holders of record on January 7, 2016 . As a result, $3.1 million was paid to preferred shareholders on January 15, 2016 . These amounts are reflected as a reduction of stockholders’ equity in the case of common stock and preferred stock dividends and noncontrolling interests deductions in the case of limited partner distributions and are included in dividends and distributions payable in the accompanying consolidated financial statements.

Interim Results (Unaudited)

Interim Results (Unaudited)	12 Months Ended
	Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract]
Interim Results (Unaudited)	INTERIM RESULTS (Unaudited) The following summary presents the results of operations of the Company for the quarterly periods of calendar years 2015 and 2014 . (In thousands, except per share amounts) 2015 1st Quarter 2nd Quarter 3rd Quarter 4th Quarter Revenue $ 52,088 $ 51,711 $ 52,376 $ 52,902 Operating income before loss on early extinguishment of debt, gain on casualty settlement, and noncontrolling interests 12,687 12,922 13,238 14,083 Gain on sales of properties — 11 — — Net income attributable to Saul Centers, Inc. 10,207 10,396 10,615 11,250 Net income available to common stockholders 7,113 7,302 7,522 8,156 Net income available to common stockholders per diluted share 0.33 0.35 0.36 0.38 (In thousands, except per share amounts) 2014 1st Quarter 2nd Quarter 3rd Quarter 4th Quarter Revenue $ 52,947 $ 52,286 $ 50,595 $ 51,264 Operating income before loss on early extinguishment of debt, gain on casualty settlement, and noncontrolling interests 12,713 14,423 12,479 12,314 Gain on sales of properties — 6,069 — — Net income attributable to Saul Centers, Inc. 10,287 16,054 10,106 10,496 Net income available to common stockholders 7,081 12,847 6,900 5,274 Net income available to common stockholders per diluted share 0.34 0.62 0.33 0.25

Business Segments

Business Segments	12 Months Ended
	Dec. 31, 2015
Segment Reporting [Abstract]
Business Segments	BUSINESS SEGMENTS The Company has two reportable business segments: Shopping Centers and Mixed-Use Properties. The accounting policies of the segments are the same as those described in the summary of significant accounting policies (see Note 2). The Company evaluates performance based upon income and cash flows from real estate for the combined properties in each segment. All of our properties within each segment generate similar types of revenues and expenses related to tenant rent, reimbursements and operating expenses. Although services are provided to a range of tenants, the types of services provided to them are similar within each segment. The properties in each portfolio have similar economic characteristics and the nature of the products and services provided to our tenants and the method to distribute such services are consistent throughout the portfolio. Certain reclassifications have been made to prior year information to conform to the 2015 presentation. SAUL CENTERS, INC. Notes to Consolidated Financial Statements (In thousands) Shopping Mixed-Use Corporate Consolidated As of or for the year ended December 31, 2015 Centers Properties and Other Totals Real estate rental operations: Revenue $ 156,110 $ 52,916 $ 51 $ 209,077 Expenses (33,877 ) (17,266 ) — (51,143 ) Income from real estate 122,233 35,650 51 157,934 Interest expense and amortization of deferred debt costs — — (45,165 ) (45,165 ) General and administrative — — (16,353 ) (16,353 ) Subtotal 122,233 35,650 (61,467 ) 96,416 Depreciation and amortization of deferred leasing costs (30,171 ) (13,099 ) — (43,270 ) Acquisition related costs (84 ) — — (84 ) Predevelopment expenses (57 ) (75 ) — (132 ) Change in fair value of derivatives — — (10 ) (10 ) Gain on sale of property 11 — — 11 Net income (loss) $ 91,932 $ 22,476 $ (61,477 ) $ 52,931 Capital investment $ 17,159 $ 52,460 $ — $ 69,619 Total assets $ 936,542 $ 356,400 $ 11,203 $ 1,304,145 As of or for the year ended December 31, 2014 Real estate rental operations: Revenue $ 154,385 $ 52,632 $ 75 $ 207,092 Expenses (33,781 ) (15,732 ) — (49,513 ) Income from real estate 120,604 36,900 75 157,579 Interest expense and amortization of deferred debt costs — — (46,034 ) (46,034 ) General and administrative — — (16,961 ) (16,961 ) Subtotal 120,604 36,900 (62,920 ) 94,584 Depreciation and amortization of deferred leasing costs (28,082 ) (13,121 ) — (41,203 ) Acquisition related costs (949 ) — — (949 ) Predevelopment expenses — (503 ) — (503 ) Change in fair value of derivatives — — (10 ) (10 ) Gain on sale of property 6,069 — — 6,069 Net income (loss) $ 97,642 $ 23,276 $ (62,930 ) $ 57,988 Capital investment $ 66,508 $ 23,760 $ — $ 90,268 Total assets $ 946,819 $ 307,901 $ 12,267 $ 1,266,987 SAUL CENTERS, INC. Notes to Consolidated Financial Statements (continued) (In thousands) Shopping Mixed-Use Corporate Consolidated As of or for the year ended December 31, 2013 Centers Properties and Other Totals Real estate rental operations: Revenue $ 145,219 $ 52,609 $ 69 $ 197,897 Expenses (30,729 ) (17,213 ) — (47,942 ) Income from real estate 114,490 35,396 69 149,955 Interest expense and amortization of deferred debt costs — — (46,589 ) (46,589 ) General and administrative — — (14,951 ) (14,951 ) Subtotal 114,490 35,396 (61,471 ) 88,415 Depreciation and amortization of deferred leasing costs (27,340 ) (21,790 ) — (49,130 ) Acquisition related costs (106 ) — — (106 ) Predevelopment expenses — (3,910 ) — (3,910 ) Loss on early extinguishment of debt — — (497 ) (497 ) Gain on casualty settlement 77 — — 77 Change in fair value of derivatives — — (7 ) (7 ) Net income (loss) $ 87,121 $ 9,696 $ (61,975 ) $ 34,842 Capital investment $ 18,232 $ 8,207 $ — $ 26,439 Total assets $ 888,109 $ 293,512 $ 17,054 $ 1,198,675

Subsequent Events

Subsequent Events	12 Months Ended
	Dec. 31, 2015
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events The Company has reviewed operating activities for the period subsequent to December 31, 2015 and prior to the date that financial settlements are issued, March 4, 2016 , and determined there are no subsequent events that are required to be disclosed.

Real Estate and Accumulated Dep

Real Estate and Accumulated Depreciation	12 Months Ended
	Dec. 31, 2015
SEC Schedule III, Real Estate and Accumulated Depreciation Disclosure [Abstract]
Real Estate and Accumulated Depreciation	SAUL CENTERS, INC. Real Estate and Accumulated Depreciation December 31, 2015 (Dollars in Thousands) Costs Buildings Capitalized Basis at Close of Period and Initial Basis Subsequent to Acquisition Land Buildings and Improvements Leasehold Interests Total Accumulated Depreciation Book Value Related Debt Date of Construction Date Acquired Improvements Depreciable Lives in Years Shopping Centers Ashburn Village, Ashburn, VA $ 11,431 $ 19,713 $ 6,764 $ 24,380 $ — $ 31,144 $ 11,578 $ 19,566 $ 29,564 1994 & 2000-6 3/94 40 Ashland Square Phase I, Dumfries, VA 1,178 7,503 1,178 7,503 — 8,681 1,108 7,573 — 2007, 2013 12/04 20 & 50 Beacon Center, Alexandria, VA 1,493 18,172 — 18,571 1,094 19,665 13,156 6,509 31,844 1960 & 1974 1/72 40 & 50 BJ’s Wholesale Club, Alexandria, VA 22,623 — 22,623 — — 22,623 — 22,623 11,365 3/08 — Boca Valley Plaza, Boca Raton, FL 16,720 1,434 5,735 12,419 — 18,154 3,877 14,277 10,587 2/04 40 Boulevard, Fairfax, VA 4,883 4,461 3,687 5,657 — 9,344 2,379 6,965 17,666 1969, 1999 & 2009 4/94 40 Briggs Chaney MarketPlace, Silver Spring, MD 27,037 3,497 9,789 20,745 — 30,534 6,684 23,850 15,064 4/04 40 Broadlands Village, Ashburn, VA 5,316 26,745 5,300 26,761 — 32,061 9,101 22,960 17,964 2002-3, 2004 & 2006 3/02 40 & 50 Countryside Marketplace, Sterling, VA 28,912 3,286 7,666 24,532 — 32,198 7,278 24,920 15,098 2/04 40 Cranberry Square, Westminster, MD 31,578 512 6,700 25,390 — 32,090 2,736 29,354 18,150 9/11 40 Cruse MarketPlace, Cumming, GA 12,226 239 3,901 8,564 — 12,465 2,531 9,934 — 3/04 40 Flagship Center, Rockville, MD 160 9 169 — — 169 — 169 — 1972 1/72 — French Market, Oklahoma City, OK 5,781 13,858 1,118 18,521 — 19,639 10,080 9,559 — 1972 & 1998 3/74 50 Germantown, Germantown, MD 3,576 990 2,034 2,532 — 4,566 2,154 2,412 — 1990 8/93 40 750/730/726 N. Glebe Road, Arlington, VA 46,312 1,994 44,831 3,475 — 48,306 697 47,609 — 08/14, 12/14, 09/15 3 & 2 The Glen, Woodbridge, VA 12,918 7,734 5,300 15,352 — 20,652 7,899 12,753 8,622 1993 & 2005 6/94 40 Great Eastern, District Heights, MD 4,993 10,678 3,785 11,886 — 15,671 8,023 7,648 — 1958 & 1960 1/72 40 Great Falls Center, Great Falls, VA 41,750 2,986 14,766 29,970 — 44,736 5,876 38,860 14,177 3/08 40 Hampshire Langley, Takoma, MD 3,159 3,350 1,856 4,653 — 6,509 3,484 3,025 16,826 1960 1/72 40 Hunt Club Corners, Apopka, FL 12,584 3,165 4,822 10,927 — 15,749 2,931 12,818 5,959 6/06, 12/12 40 Jamestown Place, Altamonte Springs, FL 14,055 1,161 4,455 10,761 — 15,216 2,829 12,387 8,025 11/05 40 Kentlands Square I, Gaithersburg, MD 14,379 328 5,006 9,701 — 14,707 3,206 11,501 7,180 2002 9/02 40 Kentlands Square II, Gaithersburg, MD 76,723 1,188 22,800 55,111 — 77,911 5,925 71,986 38,842 9/11, 9/13 40 Kentlands Place, Gaithersburg, MD 1,425 7,202 1,425 7,202 — 8,627 3,176 5,451 — 2005 1/04 50 Lansdowne Town Center, Leesburg, VA 6,545 36,364 6,546 36,363 — 42,909 11,352 31,557 34,420 2006 11/02 50 Leesburg Pike Plaza, Baileys Crossroads, VA 2,418 6,173 1,132 7,459 — 8,591 5,700 2,891 16,348 1965 2/66 40 Lumberton Plaza, Lumberton, NJ 4,400 11,170 950 14,620 — 15,570 12,109 3,461 — 1975 12/75 40 Metro Pike Center, Rockville, MD 33,123 3,090 26,064 10,149 — 36,213 973 35,240 14,801 12/10 40 Shops at Monocacy, Frederick, MD 9,541 13,926 9,260 14,207 — 23,467 4,635 18,832 13,387 2003-4 11/03 50 Northrock, Warrenton, VA 12,686 15,167 12,686 15,167 — 27,853 2,813 25,040 15,748 2009 01/08 50 Olde Forte Village, Ft. Washington, MD 15,933 6,514 5,409 17,038 — 22,447 6,112 16,335 10,928 2003-4 07/03 40 Olney, Olney, MD 1,884 1,706 — 3,590 — 3,590 3,275 315 11,282 1972 11/75 40 Orchard Park, Dunwoody, GA 19,377 814 7,751 12,440 — 20,191 2,703 17,488 10,492 7/07 40 Palm Springs Center, Altamonte Springs, FL 18,365 1,375 5,739 14,001 — 19,740 3,648 16,092 9,127 3/05 40 Ravenwood, Baltimore, MD 1,245 4,097 703 4,639 — 5,342 2,771 2,571 15,360 1959 & 2006 1/72 40 11503 Rockville Pike/5541 Nicholson Lane, Rockville, MD 26,561 — 22,113 4,448 — 26,561 584 25,977 — 10/10 40 1500/1580/1582/1584 Rockville Pike, Rockville, MD 51,149 906 43,863 8,192 — 52,055 3,281 48,774 — 12/12, 1/14, 4/14, 12/14 5, 10, 5, 4 Seabreeze Plaza, Palm Harbor, FL 24,526 1,525 8,665 17,386 — 26,051 4,566 21,485 17,011 11/05 40 Market Place at Sea Colony, Bethany Beach, DE 2,920 106 1,147 1,879 — 3,026 373 2,653 — 3/08 40 Seven Corners, Falls Church, VA 4,848 43,692 4,913 43,627 — 48,540 26,614 21,926 67,850 1956 & 1997 7/73 40 Severna Park Marketplace, Severna Park, MD 63,254 86 12,700 50,640 — 63,340 5,381 57,959 34,133 9/11 40 Shops at Fairfax, Fairfax, VA 2,708 9,924 992 11,640 — 12,632 7,259 5,373 11,778 1975 & 1999 6/75 50 Smallwood Village Center, Waldorf, MD 17,819 7,619 6,402 19,036 — 25,438 5,763 19,675 — 1/06 40 Southdale, Glen Burnie, MD 3,650 21,366 — 24,394 622 25,016 20,890 4,126 — 1962 & 1986 1/72 40 Southside Plaza, Richmond, VA 6,728 10,357 1,878 15,207 — 17,085 11,595 5,490 — 1958 1/72 40 South Dekalb Plaza, Atlanta, GA 2,474 4,130 703 5,901 — 6,604 4,491 2,113 — 1970 2/76 40 Thruway, Winston-Salem, NC 4,778 23,579 5,496 22,756 105 28,357 14,760 13,597 40,360 1955 & 1965 5/72 40 Village Center, Centreville, VA 16,502 1,971 7,851 10,622 — 18,473 6,003 12,470 14,197 1990 8/93 40 Westview Village, Frederick, MD 6,047 22,499 6,047 22,499 — 28,546 5,310 23,236 — 2009 11/07, 02/15 50 White Oak, Silver Spring, MD 6,277 5,357 4,649 6,985 — 11,634 5,758 5,876 25,088 1958 & 1967 1/72 40 Other Buildings / Improvements 221 221 221 95 126 — Total Shopping Centers 766,970 393,939 389,369 769,719 1,821 1,160,909 295,522 865,387 629,243 Mixed-Use Properties Avenel Business Park, Gaithersburg, MD 21,459 28,896 3,756 46,599 — 50,355 33,503 16,852 29,714 1981-2000 12/2/1984 35 & 40 Clarendon Center, Arlington, VA (1) 12,753 185,129 16,287 181,595 — 197,882 27,412 170,470 112,299 2010 7/73, 1/96 & 4/02 50 601 Pennsylvania Ave., Washington, DC 5,479 65,773 5,667 65,585 — 71,252 47,842 23,410 — 1986 7/73 35 Washington Square, Alexandria, VA 2,034 53,631 544 55,121 — 55,665 21,091 34,574 30,778 1952 & 2000 7/73 50 Total Mixed-Use Properties 41,725 333,429 26,254 348,900 — 375,154 129,848 245,306 172,791 Development Land Ashland Square Phase II, Manassas, VA 5,292 1,736 7,028 — — 7,028 — 7,028 — 12/04 New Market, New Market, MD 2,088 286 2,374 — — 2,374 — 2,374 — 9/05 Park Van Ness, Washington, DC 2,242 75,003 2,242 75,003 — 77,245 — 77,245 45,208 07/73 and 02/11 Total Development Land 9,622 77,025 11,644 75,003 — 86,647 — 86,647 45,208 Total $ 818,317 $ 804,393 $ 427,267 $ 1,193,622 $ 1,821 $ 1,622,710 $ 425,370 $ 1,197,340 $ 847,242 (1) Includes the North and South Blocks and Residential Depreciation and amortization related to the real estate investments reflected in the statements of operations is calculated over the estimated useful lives of the assets as follows: Base building Generally 35 - 50 years or a shorter period if management determines that the building has a shorter useful life. Building components Up to 20 years Tenant improvements The shorter of the term of the lease or the useful life of the improvements The aggregate remaining net basis of the real estate investments for federal income tax purposes was approximately $1.1 billion at December 31, 2015 . Depreciation and amortization are provided on the declining balance and straight-line methods over the estimated useful lives of the assets. The changes in total real estate investments and related accumulated depreciation for each of the years in the three year period ended December 31, 2015 are summarized as follows: (In thousands) 2015 2014 2013 Total real estate investments: Balance, beginning of year $ 1,560,159 $ 1,459,439 $ 1,466,068 Acquisitions 4,894 70,921 5,124 Improvements 70,067 34,417 21,991 Retirements (1,981 ) (4,618 ) (33,744 ) Transfers to assets held for sale (10,429 ) — — Balance, end of year $ 1,622,710 $ 1,560,159 $ 1,459,439 Total accumulated depreciation: Balance, beginning of year $ 396,617 $ 364,663 $ 353,305 Depreciation expense 37,698 35,933 43,204 Retirements (1,911 ) (3,979 ) (31,846 ) Transfers to assets held for sale (7,034 ) $ — — Balance, end of year $ 425,370 $ 396,617 $ 364,663

Summary of Significant Accoun27

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2015
Accounting Policies [Abstract]
Nature of Operations	Nature of Operations The Company, which conducts all of its activities through its subsidiaries, the Operating Partnership and Subsidiary Partnerships, engages in the ownership, operation, management, leasing, acquisition, renovation, expansion, development and financing of community and neighborhood shopping centers and mixed-used properties, primarily in the Washington, DC/Baltimore metropolitan area. Because the properties are located primarily in the Washington, DC/Baltimore metropolitan area, a disproportionate economic downturn in the local economy would have a greater negative impact on our overall financial performance than on the overall financial performance of a company with a portfolio that is more geographically diverse. A majority of the Shopping Centers are anchored by several major tenants.
Principles of Consolidation	Principles of Consolidation The accompanying consolidated financial statements include the accounts of Saul Centers, its subsidiaries, and the Operating Partnership and Subsidiary Partnerships which are majority owned by Saul Centers. All significant intercompany balances and transactions have been eliminated in consolidation.
Use of Estimates	Use of Estimates The preparation of financial statements in conformity with accounting principles generally accepted in the United States requires management to make certain 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 revenue and expenses during the reporting period. Actual results could differ from those estimates.
Real Estate Investment Properties	Real Estate Investment Properties The Company purchases real estate investment properties from time to time and records assets acquired and liabilities assumed, including land, buildings, and intangibles related to in-place leases and customer relationships, based on their fair values. The fair value of buildings generally is determined as if the buildings were vacant upon acquisition and then subsequently leased at market rental rates and considers the present value of all cash flows expected to be generated by the property including an initial lease up period. From time to time the Company may purchase a property for future development purposes. The property may be improved with an existing structure that would be demolished as part of the development. In such cases, the fair value of the building may be determined based only on existing leases and not include estimated cash flows related to future leases. In certain circumstances, such as if the building is vacant and the Company intends to demolish the building in the near term, the entire purchase price will be allocated to land. The Company determines the fair value of above and below market intangibles associated with in-place leases by assessing the net effective rent and remaining term of the lease relative to market terms for similar leases at acquisition taking into consideration the remaining contractual lease period, renewal periods, and the likelihood of the tenant exercising its renewal options. The fair value of a below market lease component is recorded as deferred income and accreted as additional lease revenue over the remaining contractual lease period. If the fair value of the below market lease intangible includes fair value associated with a renewal option, such amounts are not accreted until the renewal option is exercised. If the renewal option is not exercised the value is recognized at that time. The fair value of above market lease intangibles is recorded as a deferred asset and is amortized as a reduction of lease revenue over the remaining contractual lease term. The Company determines the fair value of at-market in-place leases considering the cost of acquiring similar leases, the foregone rents associated with the lease-up period and carrying costs associated with the lease-up period. Intangible assets associated with at-market in-place leases are amortized as additional expense over the remaining contractual lease term. To the extent customer relationship intangibles are present in an acquisition, the fair values of the intangibles are amortized over the lives of the customer relationships. The Company has never recorded a customer relationship intangible asset. Acquisition-related transaction costs are either (a) expensed as incurred when related to business combinations or (b) capitalized to land and/or building when related to asset acquisitions. If there is an event or change in circumstance that indicates a potential impairment in the value of a real estate investment property, the Company prepares an analysis to determine whether the carrying value of the real estate investment property exceeds its estimated fair value. The Company considers both quantitative and qualitative factors including recurring operating losses, significant decreases in occupancy, and significant adverse changes in legal factors and business climate. If impairment indicators are present, the Company compares the projected cash flows of the property over its remaining useful life, on an undiscounted basis, to the carrying value of that property. The Company assesses its undiscounted projected cash flows based upon estimated capitalization rates, historic operating results and market conditions that may affect the property. If the carrying value is greater than the undiscounted projected cash flows, the Company would recognize an impairment loss equivalent to an amount required to adjust the carrying amount to its then estimated fair value. The fair value of any property is sensitive to the actual results of any of the aforementioned estimated factors, either individually or taken as a whole. Should the actual results differ from management’s projections, the valuation could be negatively or positively affected. The Company did not recognize an impairment loss on any of its real estate in 2015 , 2014 , or 2013 . Interest, real estate taxes, development related salary costs and other carrying costs are capitalized on projects under development and construction. Once construction is substantially completed and the assets are placed in service, their rental income, real estate tax expense, property operating expenses (consisting of payroll, repairs and maintenance, utilities, insurance and other property related expenses) and depreciation are included in current operations. Property operating expenses are charged to operations as incurred. Interest expense capitalized totaled $2.2 million , $0.7 million , and $ 0.2 million during 2015 , 2014 , and 2013 , respectively. Commercial development projects are considered substantially complete and available for occupancy upon completion of tenant improvements, but no later than one year from the cessation of major construction activity. Multi-family residential development projects are considered substantially complete and available for occupancy upon receipt of the certificate of occupancy from the appropriate licensing authority. Substantially completed portions of a project are accounted for as separate projects. Depreciation is calculated using the straight-line method and estimated useful lives of generally between 35 and 50 years for base buildings, or a shorter period if management determines that the building has a shorter useful life, and up to 20 years for certain other improvements that extend the useful lives. Leasehold improvements expenditures are capitalized when certain criteria are met, including when the Company supervises construction and will own the improvements. Tenant improvements are amortized, over the shorter of the lives of the related leases or the useful life of the improvement, using the straight-line method.
Deferred Leasing Costs	Deferred Leasing Costs Deferred leasing costs consist of commissions paid to third-party leasing agents, internal direct costs such as employee compensation and payroll-related fringe benefits directly related to time spent performing leasing-related activities for successful commercial leases and amounts attributed to in place leases associated with acquired properties and are amortized, using the straight-line method, over the term of the lease or the remaining term of an acquired lease. Leasing related activities include evaluating the prospective tenant’s financial condition, evaluating and recording guarantees, collateral and other security arrangements, negotiating lease terms, preparing lease documents and closing the transaction. Unamortized deferred costs are charged to expense if the applicable lease is terminated prior to expiration of the initial lease term.
Construction in Progress	Construction in Progress Construction in progress includes preconstruction and development costs of active projects. Preconstruction costs include legal, zoning and permitting costs and other project carrying costs incurred prior to the commencement of construction. Development costs include direct construction costs and indirect costs incurred subsequent to the start of construction such as architectural, engineering, construction management and carrying costs consisting of interest, real estate taxes and insurance.
Accounts Receivable and Accrued Income	Accounts Receivable and Accrued Income Accounts receivable primarily represent amounts currently due from tenants in accordance with the terms of the respective leases. Receivables are reviewed monthly and reserves are established with a charge to current period operations when, in the opinion of management, collection of the receivable is doubtful.
Assets Held For Sale	Assets Held for Sale The Company considers properties to be assets held for sale when all of the following criteria are met: • management commits to a plan to sell a property; • it is unlikely that the disposal plan will be significantly modified or discontinued; • the property is available for immediate sale in its present condition; • actions required to complete the sale of the property have been initiated; • sale of the property is probable and the Company expects the completed sale will occur within one year; and • the property is actively being marketed for sale at a price that is reasonable given its current market value. The Company must make a determination as to the point in time that it is probable that a sale will be consummated, which generally occurs when an executed sales contract has no contingencies and the prospective buyer has significant funds at risk to ensure performance. Upon designation as an asset held for sale, the Company records the carrying value of each property at the lower of its carrying value or its estimated fair value, less estimated costs to sell, and ceases depreciation. As of December 31, 2015 , the Company has classified as held-for-sale one operating property, comprising 197,127 square feet of gross leasable area. The book value of this property, which is included in Other Assets, was $3.4 million , net of accumulated depreciation of $7.0 million , which does not exceed its estimated fair value, less costs to sell, and liabilities were $0.2 million . Fair value was determined based on a third party appraisal.
Cash and Cash Equivalents	Cash and Cash Equivalents Cash and cash equivalents include short-term investments. Short-term investments include money market accounts and other investments which generally mature within three months, measured from the acquisition date, and/or are readily convertible to cash. Substantially all of the Company’s cash balances at December 31, 2015 are held in non-interest bearing accounts at various banks. From time to time the Company may maintain deposits with financial institutions in amounts in excess of federally insured limits. The Company has not experienced any losses on such deposits and believes it is not exposed to any significant credit risk on those deposits.
Deferred Debt Costs	Deferred Debt Costs Deferred debt costs consist of fees and costs incurred to obtain long-term financing, construction financing and the revolving line of credit. These fees and costs are being amortized on a straight-line basis over the terms of the respective loans or agreements, which approximates the effective interest method.
Deferred Income	Deferred Income Deferred income consists of payments received from tenants prior to the time they are earned and recognized by the Company as revenue, including tenant prepayment of rent for future periods, real estate taxes when the taxing jurisdiction has a fiscal year differing from the calendar year reimbursements specified in the lease agreement and tenant construction work provided by the Company. In addition, deferred income includes the fair value of certain below market leases.
Derivative Financial Instruments	Derivative Financial Instruments The Company may, when appropriate, employ derivative instruments, such as interest-rate swaps, to mitigate the risk of interest rate fluctuations. The Company does not enter into derivative or other financial instruments for trading or speculative purposes. Derivative financial instruments are carried at fair value as either assets or liabilities on the consolidated balance sheets. For those derivative instruments that qualify, the Company may designate the hedging instrument, based upon the exposure being hedged, as a fair value hedge or a cash flow hedge. Derivative instruments that are designated as a hedge are evaluated to ensure they continue to qualify for hedge accounting. The effective portion of any gain or loss on the hedge instruments is reported as a component of accumulated other comprehensive income (loss) and recognized in earnings within the same line item associated with the forecasted transaction in the same period or periods during which the hedged transaction affects earnings. Any ineffective portion of the change in fair value of a derivative instrument is immediately recognized in earnings. For derivative instruments that do not meet the criteria for hedge accounting, or that qualify and are not designated, changes in fair value are immediately recognized in earnings.
Revenue Recognition	Revenue Recognition Rental and interest income are accrued as earned except when doubt exists as to collectability, in which case the accrual is discontinued. Recognition of rental income commences when control of the space has been given to the tenant. When rental payments due under leases vary from a straight-line basis because of free rent periods or stepped increases, income is recognized on a straight-line basis. Expense recoveries represent a portion of property operating expenses billed to the tenants, including common area maintenance, real estate taxes and other recoverable costs. Expense recoveries are recognized in the period in which the expenses are incurred. Rental income based on a tenant’s revenue (“percentage rent”) is accrued when a tenant reports sales that exceed a specified breakpoint, pursuant to the terms of their respective leases.
Income Taxes	Income Taxes The Company made an election to be treated, and intends to continue operating so as to qualify, as a REIT under the Code, commencing with its taxable year ended December 31, 1993 . A REIT generally will not be subject to federal income taxation, provided that distributions to its stockholders equal or exceed its REIT taxable income and complies with certain other requirements. Therefore, no provision has been made for federal income taxes in the accompanying consolidated financial statements. As of December 31, 2015 , the Company had no material unrecognized tax benefits and there exist no potentially significant unrecognized tax benefits which are reasonably expected to occur within the next twelve months. The Company recognizes penalties and interest accrued related to unrecognized tax benefits, if any, as general and administrative expense.
Stock Based Employee Compensation, Deferred Compensation and Stock Plan for Directors	Stock Based Employee Compensation, Deferred Compensation and Stock Plan for Directors The Company uses the fair value method to value and account for employee stock options. The fair value of options granted is determined at the time of each award using the Black-Scholes model, a widely used method for valuing stock based employee compensation, and the following assumptions: (1) Expected Volatility determined using the most recent trading history of the Company’s common stock (month-end closing prices) corresponding to the average expected term of the options; (2) Average Expected Term of the options is based on prior exercise history, scheduled vesting and the expiration date; (3) Expected Dividend Yield determined by management after considering the Company’s current and historic dividend yield rates, the Company’s yield in relation to other retail REITs and the Company’s market yield at the grant date; and (4) a Risk-free Interest Rate based upon the market yields of US Treasury obligations with maturities corresponding to the average expected term of the options at the grant date. The Company amortizes the value of options granted ratably over the vesting period and includes the amounts as compensation in general and administrative expenses. The Company has a stock plan, which was originally approved in 2004, amended in 2008 and 2013 and which expires in 2023, for the purpose of attracting and retaining executive officers, directors and other key personnel (the "Stock Plan"). Pursuant to the Stock Plan, the Compensation Committee established a Deferred Compensation Plan for Directors for the benefit of its directors and their beneficiaries, which replaced a previous Deferred Compensation and Stock Plan for Directors. A director may make an annual election to defer all or part of his or her director’s fees and has the option to have the fees paid in cash, in shares of common stock or in a combination of cash and shares of common stock upon separation from the Board. If the director elects to have fees paid in stock, fees earned during a calendar quarter are aggregated and divided by the common stock’s closing market price on the first trading day of the following quarter to determine the number of shares to be allocated to the director. As of December 31, 2015 , the directors’ deferred fee accounts comprise 241,949 shares. The Compensation Committee has also approved an annual award of shares of the Company’s common stock as additional compensation to each director serving on the Board of Directors as of the record date for the Annual Meeting of Stockholders. The shares are awarded as of each Annual Meeting of Shareholders, and their issuance may not be deferred.
Noncontrolling Interest	Noncontrolling Interest Saul Centers is the sole general partner of the Operating Partnership, owning a 74.2% common interest as of December 31, 2015 . Noncontrolling interest in the Operating Partnership is comprised of limited partnership units owned by the Saul Organization. Noncontrolling interest reflected on the accompanying consolidated balance sheets is increased for earnings allocated to limited partnership interests and distributions reinvested in additional units, and is decreased for limited partner distributions. Noncontrolling interest reflected on the consolidated statements of operations represents earnings allocated to limited partnership interests held by the Saul Organization.
Per Share Data	Per Share Data Per share data for net income (basic and diluted) is computed using weighted average shares of common stock. Convertible limited partnership units and employee stock options are the Company’s potentially dilutive securities. For all periods presented, the convertible limited partnership units are anti-dilutive. The treasury stock method was used to measure the effect of the dilution.
Legal Contingencies	Legal Contingencies The Company is subject to various legal proceedings and claims that arise in the ordinary course of business, which are generally covered by insurance. Upon determination that a loss is probable to occur and can be reasonably estimated, the estimated amount of the loss is recorded in the financial statements.
Recently Issued Accounting Standards	Recently Issued Accounting Standards In April 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2014-08, “Presentation of Financial Statements (Topic 205) and Property Plant and Equipment (Topic 360)” (“ASU 2014-08”). ASU 2014-08 changes the requirements for reporting discontinued operations such that disposals of components of an entity will be reported in discontinued operations if the disposal represents a strategic shift that has (or will have) a major effect on an entity’s operations. ASU 2014-08 also requires additional disclosures about discontinued operations. ASU 2014-08 is effective for annual periods beginning after December 15, 2014, and interim periods within those years and early adoption is permitted. The Company retrospectively adopted ASU 2014-08 on April 15, 2014. The adoption of ASU 2014-08 did not have a material impact on the Company’s financial condition or results of operations. In May 2014, the FASB issued ASU No. 2014-09, “Revenue from Contracts with Customers” (“ASU 2014-09”). ASU 2014-09 will replace most existing revenue recognition guidance and will require an entity to recognize the amount of revenue to which it expects to be entitled for the transfer of promised goods or services to customers. ASU 2014-09 is effective for annual periods beginning after December 15, 2016, and interim periods within those years and early adoption is not permitted. ASU 2014-09 must be applied retrospectively by either restating prior periods or by recognizing the cumulative effect as of the first date of application. We have not yet selected a transition method and are evaluating the impact that ASU 2014-09 will have on our consolidated financial statements and related disclosures. In April 2015, the FASB issued ASU No. 2015-03, “Interest - Imputation of Interest” (“ASU 2015-03”). ASU 2015-03 simplifies the presentation of debt issuance costs and will require an entity to deduct transaction costs from the carrying value of the related financial liability and not record those transaction costs as a separate asset. Recognition and measurement guidance for debt issuance costs are not affected by ASU 2015-03. ASU 2015-03 is effective for annual periods beginning after December 15, 2015, and interim periods within those years, and must be applied retrospectively by adjusting the balance sheet of each individual period presented. Adoption of ASU 2015-03 is not expected to have a material effect on our consolidated financial statements and related disclosures. In February 2016, the FASB issued ASU 2016-02, ‘‘Leases’’ (“ASU 2016-02”). ASU 2016-02 amends the existing accounting standards for lease accounting, including requiring lessees to recognize most leases on their balance sheets and making targeted changes to lessor accounting. ASU 2016-02 is effective for annual periods beginning after December 15, 2018, interim periods within those years, and requires a modified retrospective transition approach for all leases existing at the date of initial application, with an option to use certain practical expedients for those existing leases. We are evaluating the impact that ASU 2016-02 will have on our consolidated financial statements and related disclosures.
Reclassifications	Reclassifications Certain reclassifications have been made to prior years to conform to the presentation used for year ended December 31, 2015 .

Organization, Formation, and 28

Organization, Formation, and Basis of Presentation (Tables)	12 Months Ended
	Dec. 31, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Properties Acquired and/or Developed	The following table lists the significant properties acquired, developed and/or disposed of by the Company since January 1, 2013 . Name of Property Location Type Year of Acquisition/ Development/ Disposal Acquisitions 1580 Rockville Pike Rockville, Maryland Shopping Center January 2014 1582 Rockville Pike Rockville, Maryland Shopping Center April 2014 750 N. Glebe Road Arlington, Virginia Shopping Center August 2014 730 N. Glebe Road Arlington, Virginia Shopping Center December 2014 1584 Rockville Pike Rockville, Maryland Shopping Center December 2014 726 N. Glebe Road Arlington, Virginia Shopping Center September 2015 Developments Park Van Ness Washington, DC Mixed-Use 2013-2015 Dispositions Giant Center Milford Mill, Maryland Shopping Center April 2014

Summary of Significant Accoun29

Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2015
Accounting Policies [Abstract]
Schedule of Construction in Progress	The following table shows the components of construction in progress. December 31, (in thousands) 2015 2014 Park Van Ness $ 77,245 $ 26,998 Other 6,271 3,263 Total $ 83,516 $ 30,261
Allowance for Doubtful Accounts	Accounts receivable in the accompanying consolidated financial statements are shown net of an allowance for doubtful accounts of $1.3 million and $0.7 million , at December 31, 2015 and 2014 , respectively. (In thousands) Year ended December 31, 2015 2014 2013 Beginning Balance $ 677 $ 572 $ 1,208 Provision for Credit Losses 915 680 968 Charge-offs (329 ) (575 ) (1,604 ) Ending Balance $ 1,263 $ 677 $ 572
Basic and Diluted Shares Outstanding	December 31, (Shares in thousands) 2015 2014 2013 Weighted average common shares outstanding - Basic 21,127 20,772 20,364 Effect of dilutive options 69 49 37 Weighted average common shares outstanding - Diluted 21,196 20,821 20,401 Average share price $ 53.38 $ 49.09 $ 45.44 Non-dilutive options 111 107 113 Years non-dilutive options were issued 2007 and 2015 2007 and 2008 2007 and 2008

Real Estate Acquired (Tables)

Real Estate Acquired (Tables)	12 Months Ended
	Dec. 31, 2015
Real Estate [Abstract]
Allocation of Purchase Prices to Acquired Assets and Liabilities	The purchase prices were allocated to the assets acquired and liabilities assumed based on their fair value as shown in the following table. (in thousands) 1580 Rockville Pike 1582 Rockville Pike 750 N. Glebe Road 730 N. Glebe Road 1584 Rockville Pike Total Land $ 9,600 $ 9,742 $ 38,224 $ 2,683 $ 5,798 $ 66,047 Buildings 2,200 828 1,327 78 440 4,873 In-place Leases 513 849 449 39 249 2,099 Above Market Rent — — — — — — Below Market Rent (4,313 ) (419 ) — — (337 ) (5,069 ) Total Purchase Price $ 8,000 $ 11,000 $ 40,000 $ 2,800 $ 6,150 $ 67,950
Amortization of Intangible Assets and Deferred Income Related to in Place Leases	As of December 31, 2015 , scheduled amortization of intangible assets and deferred income related to in place leases is as follows: (In thousands) Lease acquisition costs Above market leases Below market leases 2016 $ 988 $ 2 $ 1,719 2017 796 1 1,697 2018 737 1 1,615 2019 550 — 1,478 2020 417 — 1,397 Thereafter 1,322 — 8,236 Total $ 4,810 $ 4 $ 16,142

Mortgage Notes Payable, Revol31

Mortgage Notes Payable, Revolving Credit Facility, Interest Expense and Amortization of Deferred Debt Costs (Tables)	12 Months Ended
	Dec. 31, 2015
Debt Disclosure [Abstract]
Summary of Notes payable	The following is a summary of notes payable as of December 31, 2015 and 2014 . Notes Payable December 31, Interest Scheduled (Dollars in thousands) 2015 2014 Rate * Maturity * Fixed rate mortgages: $ — (a) $ 15,399 7.45 % Jun-2015 30,778 (b) 32,049 6.01 % Feb-2018 33,766 (c) 35,398 5.88 % Jan-2019 10,928 (d) 11,454 5.76 % May-2019 15,098 (e) 15,819 5.62 % Jul-2019 15,064 (f) 15,761 5.79 % Sep-2019 13,387 (g) 14,014 5.22 % Jan-2020 10,587 (h) 10,881 5.60 % May-2020 9,127 (i) 9,535 5.30 % Jun-2020 40,360 (j) 41,441 5.83 % Jul-2020 8,025 (k) 8,346 5.81 % Feb-2021 5,959 (l) 6,100 6.01 % Aug-2021 34,420 (m) 35,222 5.62 % Jun-2022 10,492 (n) 10,718 6.08 % Sep-2022 11,365 (o) 11,587 6.43 % Apr-2023 14,177 (p) 14,909 6.28 % Feb-2024 16,348 (q) 16,750 7.35 % Jun-2024 14,197 (r) 14,535 7.60 % Jun-2024 25,088 (s) 25,639 7.02 % Jul-2024 29,714 (t) 30,429 7.45 % Jul-2024 29,564 (u) 30,253 7.30 % Jan-2025 15,360 (v) 15,735 6.18 % Jan-2026 112,299 (w) 115,291 5.31 % Apr-2026 34,133 (x) 35,125 4.30 % Oct-2026 38,842 (y) 39,932 4.53 % Nov-2026 18,150 (z) 18,645 4.70 % Dec-2026 67,850 (aa) 69,397 5.84 % May-2027 16,826 (bb) 17,281 4.04 % Apr-2028 31,844 (cc) 33,140 3.51 % Jun-2028 17,011 (dd) 17,462 3.99 % Sep-2028 29,444 (ee) — 3.69 % Mar-2030 15,748 (ff) — 3.99 % Apr-2030 45,208 (gg) 5,391 4.88 % Sep-2032 11,282 (hh) 11,119 8.00 % Apr-2034 Total fixed rate 832,441 784,757 5.53 % 9.2 Years Variable rate loans: 28,000 (ii) 43,000 LIBOR + 1.45 % Jun-2018 — (jj) 14,525 LIBOR + 1.65 % Feb-2016 14,801 (kk) 15,106 LIBOR + 1.65 % Feb-2017 Total variable rate $ 42,801 $ 72,631 LIBOR + 1.94 % 2.0 Years Total notes payable $ 875,242 $ 857,388 5.35 % 8.9 Years * Interest rate and scheduled maturity data presented as of December 31, 2015 . Totals computed using weighted averages. (a) The loan was collateralized by Shops at Fairfax and Boulevard shopping centers and required equal monthly principal and interest payments totaling $156,000 based upon a weighted average 23 -year amortization schedule and a final payment of $15.2 million was due at loan maturity. In 2015 the loan was repaid in full and replaced with a new $ 30.0 million loan. See (ee) below. (b) The loan is collateralized by Washington Square and requires equal monthly principal and interest payments of $264,000 based upon a 27.5 -year amortization schedule and a final payment of $28.0 million at loan maturity. Principal of $1.3 million was amortized during 2015 . (c) The loan is collateralized by three shopping centers, Broadlands Village, The Glen and Kentlands Square I, and requires equal monthly principal and interest payments of $306,000 based upon a 25 -year amortization schedule and a final payment of $28.4 million at loan maturity. Principal of $1.6 million was amortized during 2015 . (d) The loan is collateralized by Olde Forte Village and requires equal monthly principal and interest payments of $98,000 based upon a 25 -year amortization schedule and a final payment of $9.0 million at loan maturity. Principal of $526,000 was amortized during 2015 . (e) The loan is collateralized by Countryside and requires equal monthly principal and interest payments of $133,000 based upon a 25 -year amortization schedule and a final payment of $12.3 million at loan maturity. Principal of $721,000 was amortized during 2015 . (f) The loan is collateralized by Briggs Chaney MarketPlace and requires equal monthly principal and interest payments of $133,000 based upon a 25 -year amortization schedule and a final payment of $12.2 million at loan maturity. Principal of $697,000 was amortized during 2015 . (g) The loan is collateralized by Shops at Monocacy and requires equal monthly principal and interest payments of $112,000 based upon a 25 -year amortization schedule and a final payment of $10.6 million at loan maturity. Principal of $627,000 was amortized during 2015 . (h) The loan is collateralized by Boca Valley Plaza and requires equal monthly principal and interest payments of $75,000 based upon a 30 -year amortization schedule and a final payment of $9.1 million at loan maturity. Principal of $294,000 was amortized during 2015 . (i) The loan is collateralized by Palm Springs Center and requires equal monthly principal and interest payments of $75,000 based upon a 25 -year amortization schedule and a final payment of $7.1 million at loan maturity. Principal of $408,000 was amortized during 2015 . (j) The loan and a corresponding interest-rate swap closed on June 29, 2010 and are collateralized by Thruway. On a combined basis, the loan and the interest-rate swap require equal monthly principal and interest payments of $289,000 based upon a 25 -year amortization schedule and a final payment of $34.8 million at loan maturity. Principal of $1,081,000 was amortized during 2015 . (k) The loan is collateralized by Jamestown Place and requires equal monthly principal and interest payments of $66,000 based upon a 25 -year amortization schedule and a final payment of $6.1 million at loan maturity. Principal of $321,000 was amortized during 2015 . (l) The loan is collateralized by Hunt Club Corners and requires equal monthly principal and interest payments of $42,000 based upon a 30 -year amortization schedule and a final payment of $5.0 million , at loan maturity. Principal of $141,000 was amortized during 2015 . (m) The loan is collateralized by Lansdowne Town Center and requires monthly principal and interest payments of $230,000 based on a 30 -year amortization schedule and a final payment of $28.2 million at loan maturity. Principal of $802,000 was amortized during 2015 . (n) The loan is collateralized by Orchard Park and requires equal monthly principal and interest payments of $73,000 based upon a 30 -year amortization schedule and a final payment of $8.6 million at loan maturity. Principal of $226,000 was amortized during 2015 . (o) The loan is collateralized by BJ’s Wholesale and requires equal monthly principal and interest payments of $80,000 based upon a 30 -year amortization schedule and a final payment of $9.3 million at loan maturity. Principal of $222,000 was amortized during 2015 . (p) The loan is collateralized by Great Falls shopping center. The loan consists of three notes which require equal monthly principal and interest payments of $138,000 based upon a weighted average 26 -year amortization schedule and a final payment of $6.3 million at maturity. Principal of $732,000 was amortized during 2015 . (q) The loan is collateralized by Leesburg Pike and requires equal monthly principal and interest payments of $135,000 based upon a 25 -year amortization schedule and a final payment of $11.5 million at loan maturity. Principal of $402,000 was amortized during 2015 . (r) The loan is collateralized by Village Center and requires equal monthly principal and interest payments of $119,000 based upon a 25 -year amortization schedule and a final payment of $10.1 million at loan maturity. Principal of $338,000 was amortized during 2015 . (s) The loan is collateralized by White Oak and requires equal monthly principal and interest payments of $193,000 based upon a 24.4 year weighted amortization schedule and a final payment of $18.5 million at loan maturity. The loan was previously collateralized by Van Ness Square. During 2012, the Company substituted White Oak as the collateral and borrowed an additional $10.5 million . Principal of $551,000 was amortized during 2015 . (t) The loan is collateralized by Avenel Business Park and requires equal monthly principal and interest payments of $246,000 based upon a 25 -year amortization schedule and a final payment of $20.9 million at loan maturity. Principal of $715,000 was amortized during 2015 . (u) The loan is collateralized by Ashburn Village and requires equal monthly principal and interest payments of $240,000 based upon a 25 -year amortization schedule and a final payment of $20.5 million at loan maturity. Principal of $689,000 was amortized during 2015 . (v) The loan is collateralized by Ravenwood and requires equal monthly principal and interest payments of $111,000 based upon a 25 -year amortization schedule and a final payment of $10.1 million at loan maturity. Principal of $375,000 was amortized during 2015 . (w) The loan is collateralized by Clarendon Center and requires equal monthly principal and interest payments of $753,000 based upon a 25 -year amortization schedule and a final payment of $70.5 million at loan maturity. Principal of $3.0 million was amortized during 2015 . (x) The loan is collateralized by Severna Park MarketPlace and requires equal monthly principal and interest payments of $207,000 based upon a 25 -year amortization schedule and a final payment of $20.3 million at loan maturity. Principal of $992,000 was amortized during 2015 . (y) The loan is collateralized by Kentlands Square II and requires equal monthly principal and interest payments of $240,000 based upon a 25 -year amortization schedule and a final payment of $23.1 million at loan maturity. Principal of $1,090,000 was amortized during 2015 . (z) The loan is collateralized by Cranberry Square and requires equal monthly principal and interest payments of $113,000 based upon a 25 -year amortization schedule and a final payment of $10.9 million at loan maturity. Principal of $495,000 was amortized during 2015 . (aa) The loan in the original amount of $73.0 million closed in May 2012, is collateralized by Seven Corners and requires equal monthly principal and interest payments of $463,200 based upon a 25 -year amortization schedule and a final payment of $42.3 million at loan maturity. Principal of $1.5 million was amortized during 2015 . (bb) The loan is collateralized by Hampshire Langley and requires equal monthly principal and interest payments of $95,400 based upon a 25 -year amortization schedule and a final payment of $9.5 million at loan maturity. Principal of $455,000 was amortized in 2015 . (cc) The loan is collateralized by Beacon Center and requires equal monthly principal and interest payments of $203,200 based upon a 20 -year amortization schedule and a final payment of $11.4 million at loan maturity. Principal of $1,296,000 was amortized in 2015 . (dd) The loan is collateralized by Seabreeze Plaza and requires equal monthly principal and interest payments of $94,900 based upon a 25 -year amortization schedule and a final payment of $9.5 million at loan maturity. Principal of $451,000 was amortized in 2015 . (ee) The loan is collateralized by Shops at Fairfax and Boulevard shopping centers and requires equal monthly principal and interest payments totaling $153,300 based upon a 25 -year amortization schedule and a final payment of $15.5 million at maturity. Principal of $556,000 was amortized in 2015. (ff) The loan is collateralized by Northrock and requires equal monthly principal and interest payments totaling $84,400 based upon a 25 -year amortization schedule and a final payment of $8.4 million at maturity. Principal of $252,000 was amortized in 2015. (gg) The loan is a $71.6 million construction-to-permanent facility that is collateralized by and will finance a portion of the construction costs of Park Van Ness. During the construction period, interest will be funded by the loan. After conversion to a permanent loan, monthly principal and interest payments totaling $413,500 will be required based upon a 25 -year amortization schedule. A final payment of $39.6 million will be due at maturity. (hh) The Company entered into a sale-leaseback transaction with its Olney property and is accounting for that transaction as a secured financing. The arrangement requires monthly payments of $60,400 which increase by 1.5% on May 1, 2015, and every May 1 thereafter. The arrangement provides for a final payment of $14.7 million and has an implicit interest rate of 8.0% . Negative amortization in 2015 totaled $163,000 . (ii) The loan is a $275.0 million unsecured revolving credit facility. Interest accrues at a rate equal to the sum of one-month LIBOR plus a spread of 145 basis points. The line may be extended at the Company’s option for one year with payment of a fee of 0.15% . Monthly payments, if required, are interest only and vary depending upon the amount outstanding and the applicable interest rate for any given month. (jj) The loan was collateralized by Northrock and required monthly principal and interest payments of approximately $47,000 and a final payment of $14.2 million at maturity. In 2015 the loan was repaid in full and replaced with a new $ 16.0 million loan. See (ff) above. (kk) The loan is collateralized by Metro Pike Center and requires monthly principal and interest payments of approximately $48,000 and a final payment of $14.8 million at loan maturity. Principal of $305,000 was amortized during 2015 .
Scheduled Maturities of All Debt, Including Scheduled Principal Amortization	As of December 31, 2015 , the scheduled maturities of all debt including scheduled principal amortization for years ended December 31 are as follows: (in thousands) Balloon Payments Scheduled Principal Amortization Total 2016 $ — $ 24,655 $ 24,655 2017 14,430 25,798 40,228 2018 55,748 (a) 25,903 81,651 2019 60,793 24,616 85,409 2020 61,163 21,893 83,056 Thereafter 432,565 127,678 560,243 $ 624,699 $ 250,543 $ 875,242 (a) Includes $28.0 million outstanding under the line of credit.
Interest Expense and Amortization of Deferred Debt Costs	The components of interest expense are set forth below. (in thousands) Year ended December 31, 2015 2014 2013 Interest incurred $ 45,898 $ 45,396 $ 45,502 Amortization of deferred debt costs 1,433 1,327 1,257 Capitalized interest (2,166 ) (689 ) (170 ) Total $ 45,165 $ 46,034 $ 46,589

Lease Agreements (Tables)

Lease Agreements (Tables)	12 Months Ended
	Dec. 31, 2015
Leases [Abstract]
Future Contractual Payments Under Noncancelable Leases	Future contractual payments under noncancelable leases for years ended December 31 (which exclude the effect of straight-line rents), are as follows: (in thousands) 2016 $ 154,983 2017 140,786 2018 122,922 2019 100,845 2020 80,559 Thereafter 273,328 $ 873,423

Long-Term Lease Obligations (Ta

Long-Term Lease Obligations (Tables)	12 Months Ended
	Dec. 31, 2015
Leases [Abstract]
Future Minimum Rental Commitments Under Ground Leases	The future minimum rental commitments under these ground leases are as follows: Year ending December 31, (In thousands) 2016 2017 2018 2019 2020 Thereafter Total Beacon Center $ 60 $ 60 $ 60 $ 60 $ 60 $ 2,482 $ 2,782 Olney 56 56 56 57 62 3,697 3,984 Southdale 60 60 60 60 60 2,825 3,125 Total $ 176 $ 176 $ 176 $ 177 $ 182 $ 9,004 $ 9,891

Stock Option Plan (Tables)

Stock Option Plan (Tables)	12 Months Ended
	Dec. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock Options Issued	The following table summarizes the amount and activity of each grant, the total value and variables used in the computation and the amount expensed and included in general and administrative expense in the Consolidated Statements of Operations for the years ended December 31, 2015 , 2014 and 2013 . SAUL CENTERS, INC. (Dollars in thousands, except per share data) Stock options issued Directors Grant date 5/1/2006 4/27/2007 4/25/2008 4/24/2009 5/7/2010 5/13/2011 5/4/2012 5/10/2013 5/9/2014 5/8/2015 Subtotals Total grant 30,000 30,000 30,000 32,500 32,500 32,500 35,000 35,000 30,000 35,000 322,500 Vested 30,000 30,000 30,000 32,500 32,500 32,500 35,000 35,000 30,000 35,000 322,500 Exercised 20,000 5,000 7,500 22,500 15,000 15,000 15,000 12,500 7,500 5,000 125,000 Forfeited 2,500 7,500 7,500 — 2,500 2,500 — — — — 22,500 Exercisable at December 31, 2015 7,500 17,500 15,000 10,000 15,000 15,000 20,000 22,500 22,500 30,000 175,000 Remaining unexercised 7,500 17,500 15,000 10,000 15,000 15,000 20,000 22,500 22,500 30,000 175,000 Exercise price $ 40.35 $ 54.17 $ 50.15 $ 32.68 $ 38.76 $ 41.82 $ 39.29 $ 44.42 $ 47.03 $ 51.07 Volatility 0.206 0.225 0.237 0.344 0.369 0.358 0.348 0.333 0.173 0.166 Expected life (years) 9.0 8.0 7.0 6.0 5.0 5.0 5.0 5.0 5.0 5.0 Assumed yield 5.93 % 4.39 % 4.09 % 4.54 % 4.23 % 4.16 % 4.61 % 4.53 % 4.48 % 4.54 % Risk-free rate 5.11 % 4.65 % 3.49 % 2.19 % 2.17 % 1.86 % 0.78 % 0.82 % 1.63 % 1.50 % Total value at grant date $ 144 $ 285 $ 255 $ 223 $ 288 $ 297 $ 257 $ 278 $ 110 $ 125 $ 2,262 Expensed in previous years 144 285 255 223 288 297 257 — — — 1,749 Expensed in 2013 — — — — — — — 278 — — 278 Expensed in 2014 — — — — — — — — 110 — 110 Expensed in 2015 — — — — — — — — — 125 125 Future expense — — — — — — — — — — — Officers Grant date 4/27/2007 5/13/2011 5/4/2012 5/10/2013 5/9/2014 5/8/2015 Subtotals Grand Totals Total grant 135,000 162,500 242,500 202,500 170,000 190,000 1,102,500 1,425,000 Vested 67,500 118,750 81,875 91,250 42,500 — 401,875 724,375 Exercised 14,097 58,754 40,625 24,375 3,125 — 140,976 265,976 Forfeited 67,500 43,750 135,000 30,000 — — 276,250 298,750 Exercisable at December 31, 2015 53,403 59,996 41,250 66,875 39,375 — 260,899 435,899 Remaining unexercised 53,403 59,996 66,875 148,125 166,875 190,000 685,274 860,274 Exercise price $ 54.17 $ 41.82 $ 39.29 $ 44.42 $ 47.03 $ 51.07 Volatility 0.233 0.330 0.315 0.304 0.306 0.298 Expected life (years) 6.5 8.0 8.0 8.0 7.0 7.0 Assumed yield 4.13 % 4.81 % 5.28 % 5.12 % 4.89 % 4.94 % Risk-free rate 4.61 % 2.75 % 1.49 % 1.49 % 2.17 % 1.89 % Gross value at grant date $ 1,339 $ 1,367 $ 1,518 $ 1,401 $ 1,350 $ 1,585 $ 8,560 $ 10,822 Estimated forfeitures 62 368 890 280 169 142 1,911 1,911 Expensed in previous years 1,277 457 105 — — — 1,839 3,588 Expensed in 2013 — 236 157 209 — — 602 880 Expensed in 2014 — 217 157 284 197 — 855 965 Expensed in 2015 — 89 157 269 295 241 1,051 1,176 Future expense — — 52 359 689 1,202 2,302 2,302 Weighted average term of remaining future expense 2.7 years
Summary of Option Activity	The table below summarizes the option activity for the years 2015 , 2014 , and 2013 : 2015 2014 2013 Shares Weighted Shares Weighted Shares Weighted Outstanding at January 1 748,208 $ 44.79 753,625 $ 42.55 570,840 $ 41.04 Granted 225,000 51.07 200,000 47.03 237,500 44.42 Exercised (112,934 ) 43.67 (167,917 ) 37.71 (49,715 ) 33.15 Expired/Forfeited — — (37,500 ) 43.56 (5,000 ) 52.16 Outstanding December 31 860,274 46.58 748,208 44.79 753,625 42.55 Exercisable at December 31 435,899 380,708 44.85 413,000 42.42

Fair Value of Financial Instr35

Fair Value of Financial Instruments (Tables)	12 Months Ended
	Dec. 31, 2015
Fair Value Disclosures [Abstract]
Changes in Fair Value of Swaps	The following chart summarizes the changes in fair value of the Company’s swaps for the indicated periods. (Dollars in thousands) Year ended December 31, 2015 2014 2013 Increase (decrease) in fair value: Recognized in earnings $ (10 ) $ (10 ) $ (7 ) Recognized in other comprehensive income 124 (675 ) 2,897 Total $ 114 $ (685 ) $ 2,890

Distributions (Tables)

Distributions (Tables)	12 Months Ended
	Dec. 31, 2015
Equity [Abstract]
Summary of Distributions Paid Including Activity in Plan as well as Limited Partnership Units Issued from Reinvestment of Unit Distributions	The following summarizes distributions paid during the years ended December 31, 2015 , 2014 , and 2013 , and includes activity in the Plan as well as limited partnership units issued from the reinvestment of unit distributions: Total Distributions to Dividend Reinvestments (Dollars in thousands, except per share amounts) Preferred Common Limited Common Discounted Limited Partnership Units Issued Average Unit Price Distributions during 2015 October 31 $ 3,094 $ 9,106 $ 3,129 47,313 $ 55.73 28,936 $ 55.73 July 31 3,094 9,081 3,115 56,003 50.30 32,041 50.30 April 30 3,094 9,055 3,104 54,921 50.21 25,264 50.21 January 31 3,093 8,403 2,880 42,975 56.74 20,796 56.74 Total 2015 $ 12,375 $ 35,645 $ 12,228 201,212 107,037 Distributions during 2014 October 31 $ 3,856 $ 8,348 $ 2,879 40,142 $ 52.71 July 31 3,206 8,314 2,879 57,696 46.79 April 30 3,206 8,269 2,838 60,212 44.14 104,831 $ 44.77 January 31 3,206 7,415 2,521 39,588 45.15 91,352 45.80 Total 2014 $ 13,474 $ 32,346 $ 11,117 197,638 196,183 Distributions during 2013 October 31 $ 3,206 $ 7,388 $ 2,489 48,836 $ 46.27 88,309 $ 46.93 July 31 3,206 7,327 2,489 138,019 45.21 April 30 4,364 7,272 2,489 142,839 42.85 January 31 3,785 7,218 2,489 145,468 41.67 Total 2013 $ 14,561 $ 29,205 $ 9,956 475,162 88,309

Interim Results (Unaudited) (Ta

Interim Results (Unaudited) (Tables)	12 Months Ended
	Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract]
Summary of Results of Operations for Quarterly Periods	The following summary presents the results of operations of the Company for the quarterly periods of calendar years 2015 and 2014 . (In thousands, except per share amounts) 2015 1st Quarter 2nd Quarter 3rd Quarter 4th Quarter Revenue $ 52,088 $ 51,711 $ 52,376 $ 52,902 Operating income before loss on early extinguishment of debt, gain on casualty settlement, and noncontrolling interests 12,687 12,922 13,238 14,083 Gain on sales of properties — 11 — — Net income attributable to Saul Centers, Inc. 10,207 10,396 10,615 11,250 Net income available to common stockholders 7,113 7,302 7,522 8,156 Net income available to common stockholders per diluted share 0.33 0.35 0.36 0.38 (In thousands, except per share amounts) 2014 1st Quarter 2nd Quarter 3rd Quarter 4th Quarter Revenue $ 52,947 $ 52,286 $ 50,595 $ 51,264 Operating income before loss on early extinguishment of debt, gain on casualty settlement, and noncontrolling interests 12,713 14,423 12,479 12,314 Gain on sales of properties — 6,069 — — Net income attributable to Saul Centers, Inc. 10,287 16,054 10,106 10,496 Net income available to common stockholders 7,081 12,847 6,900 5,274 Net income available to common stockholders per diluted share 0.34 0.62 0.33 0.25

Business Segments (Tables)

Business Segments (Tables)	12 Months Ended
	Dec. 31, 2015
Segment Reporting [Abstract]
Business Segments	SAUL CENTERS, INC. Notes to Consolidated Financial Statements (In thousands) Shopping Mixed-Use Corporate Consolidated As of or for the year ended December 31, 2015 Centers Properties and Other Totals Real estate rental operations: Revenue $ 156,110 $ 52,916 $ 51 $ 209,077 Expenses (33,877 ) (17,266 ) — (51,143 ) Income from real estate 122,233 35,650 51 157,934 Interest expense and amortization of deferred debt costs — — (45,165 ) (45,165 ) General and administrative — — (16,353 ) (16,353 ) Subtotal 122,233 35,650 (61,467 ) 96,416 Depreciation and amortization of deferred leasing costs (30,171 ) (13,099 ) — (43,270 ) Acquisition related costs (84 ) — — (84 ) Predevelopment expenses (57 ) (75 ) — (132 ) Change in fair value of derivatives — — (10 ) (10 ) Gain on sale of property 11 — — 11 Net income (loss) $ 91,932 $ 22,476 $ (61,477 ) $ 52,931 Capital investment $ 17,159 $ 52,460 $ — $ 69,619 Total assets $ 936,542 $ 356,400 $ 11,203 $ 1,304,145 As of or for the year ended December 31, 2014 Real estate rental operations: Revenue $ 154,385 $ 52,632 $ 75 $ 207,092 Expenses (33,781 ) (15,732 ) — (49,513 ) Income from real estate 120,604 36,900 75 157,579 Interest expense and amortization of deferred debt costs — — (46,034 ) (46,034 ) General and administrative — — (16,961 ) (16,961 ) Subtotal 120,604 36,900 (62,920 ) 94,584 Depreciation and amortization of deferred leasing costs (28,082 ) (13,121 ) — (41,203 ) Acquisition related costs (949 ) — — (949 ) Predevelopment expenses — (503 ) — (503 ) Change in fair value of derivatives — — (10 ) (10 ) Gain on sale of property 6,069 — — 6,069 Net income (loss) $ 97,642 $ 23,276 $ (62,930 ) $ 57,988 Capital investment $ 66,508 $ 23,760 $ — $ 90,268 Total assets $ 946,819 $ 307,901 $ 12,267 $ 1,266,987 SAUL CENTERS, INC. Notes to Consolidated Financial Statements (continued) (In thousands) Shopping Mixed-Use Corporate Consolidated As of or for the year ended December 31, 2013 Centers Properties and Other Totals Real estate rental operations: Revenue $ 145,219 $ 52,609 $ 69 $ 197,897 Expenses (30,729 ) (17,213 ) — (47,942 ) Income from real estate 114,490 35,396 69 149,955 Interest expense and amortization of deferred debt costs — — (46,589 ) (46,589 ) General and administrative — — (14,951 ) (14,951 ) Subtotal 114,490 35,396 (61,471 ) 88,415 Depreciation and amortization of deferred leasing costs (27,340 ) (21,790 ) — (49,130 ) Acquisition related costs (106 ) — — (106 ) Predevelopment expenses — (3,910 ) — (3,910 ) Loss on early extinguishment of debt — — (497 ) (497 ) Gain on casualty settlement 77 — — 77 Change in fair value of derivatives — — (7 ) (7 ) Net income (loss) $ 87,121 $ 9,696 $ (61,975 ) $ 34,842 Capital investment $ 18,232 $ 8,207 $ — $ 26,439 Total assets $ 888,109 $ 293,512 $ 17,054 $ 1,198,675

Organization, Formation And Bas

Organization, Formation And Basis of Presentation - Additional Information (Detail)	Dec. 31, 2015partnershipproperty
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Distribution of REIT taxable income (excluding net capital gains) to its stockholders	90.00%
Number of partnerships | partnership	2
Number of real estate properties, held for sale	1
Shopping Centers
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Number of real estate properties	50
Mixed-Use Properties
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Number of real estate properties	6
Non-operating Development Properties
Organization, Consolidation and Presentation of Financial Statements Disclosure [Line Items]
Number of real estate properties	3

Summary of Significant Accoun40

Summary of Significant Accounting Policies - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2015USD ($)ft²tenantstorepropertyshares	Dec. 31, 2014USD ($)shares	Dec. 31, 2013USD ($)shares	Dec. 31, 2012USD ($)
Significant Accounting Policies [Line Items]
Number of shopping centers | store	31
Number of tenants | tenant	2
Interest expense capitalized	$ 2,166,000	$ 689,000	$ 170,000
Depreciation expense and amortization of leasehold improvements	37,698,000	35,933,000	43,204,000
Repairs and maintenance expense	11,600,000	11,900,000	10,300,000
Deferred leasing costs, net	26,919,000	26,928,000
Accumulated amortization deferred leasing cost	26,600,000	21,600,000
Amortization expense deferred leasing cost	5,600,000	5,300,000	5,900,000
Allowance for doubtful accounts receivables	1,263,000	677,000	572,000	$ 1,208,000
Accounts receivable, net representing rental income accrued	41,400,000	38,700,000
Allowance for doubtful accounts receivables representing rental income accrued	500,000	300,000
Real estate held-for-sale	3,400,000
Real estate, accumulated depreciation	425,370,000	396,617,000	364,663,000	$ 353,305,000
Real estate, costs to sell and liabilities	200,000
Deferred debt costs, net	8,737,000	9,874,000
Accumulated amortization deferred leasing cost	6,200,000	5,900,000
Accrued penalties and interest	0	0	$ 0
Tax basis of the company's real estate investments	$ 1,100,000,000	$ 1,200,000,000
Shares issued to directors, shares | shares	117,886	172,887	56,002
Percentage of ownership in operating partnership	74.20%
Options
Significant Accounting Policies [Line Items]
Antidilutive options (in shares) | shares	111,000	107,000	113,000
Director
Significant Accounting Policies [Line Items]
Shares credited to deferred fee accounts | shares	241,949
Shares issued to directors, shares | shares	200	200	200
Shares issued to directors, value	$ 143,000	$ 112,900	$ 124,400
Minimum
Significant Accounting Policies [Line Items]
Percentage of total revenue	2.50%
Giant Food
Significant Accounting Policies [Line Items]
Percentage of total revenue	4.40%
Number of shopping centers | store	9
Safeway
Significant Accounting Policies [Line Items]
Percentage of total revenue	2.70%
Number of shopping centers | store	9
Building | Minimum
Significant Accounting Policies [Line Items]
Estimated useful life	35 years
Building | Maximum
Significant Accounting Policies [Line Items]
Estimated useful life	50 years
Building Improvements | Maximum
Significant Accounting Policies [Line Items]
Estimated useful life	20 years
Property Held-for-sale
Significant Accounting Policies [Line Items]
Number of Real Estate Properties | property	1
Net rentable area | ft²	197,127
Real estate, accumulated depreciation	$ 7,000,000

Summary of Significant Accoun41

Summary of Significant Accounting Policies - Construction in Progress (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Construction in progress	$ 83,516	$ 30,261
Park Van Ness
Property, Plant and Equipment [Line Items]
Construction in progress	77,245	26,998
Other
Property, Plant and Equipment [Line Items]
Construction in progress	$ 6,271	$ 3,263

Summary of Significant Accoun42

Summary of Significant Accounting Policies - Allowance for Doubtful Accounts (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Allowance for Doubtful Accounts Receivable [Roll Forward]
Beginning Balance	$ 677	$ 572	$ 1,208
Provision for Credit Losses	915	680	968
Charge-offs	(329)	(575)	(1,604)
Ending Balance	$ 1,263	$ 677	$ 572

Summary of Significant Accoun43

Summary of Significant Accounting Policies - Basic and Diluted Shares Outstanding (Detail) - $ / shares shares in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Weighted average common shares outstanding - basic	21,127	20,772	20,364
Effect of dilutive options (in shares)	69	49	37
Weighted average common shares outstanding - diluted	21,196	20,821	20,401
Average share price (in usd per share)	$ 53.38	$ 49.09	$ 45.44
Options
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Antidilutive options (in shares)	111	107	113

Real Estate Acquired - Addition

Real Estate Acquired - Additional Information (Detail)	1 Months Ended								12 Months Ended
	Sep. 30, 2015USD ($)	Feb. 28, 2015USD ($)a	Dec. 31, 2014USD ($)property	Aug. 31, 2014USD ($)	Apr. 30, 2014USD ($)	Jan. 31, 2014USD ($)	Dec. 31, 2013USD ($)ft²Property	Aug. 31, 2013USD ($)ft²	Dec. 31, 2015USD ($)property	Dec. 31, 2014USD ($)property	Dec. 31, 2013USD ($)ft²Property
Business Acquisition [Line Items]
Aggregate cost									$ 4,000,000	$ 68,000,000	$ 5,100,000
Property acquisition costs			$ 900,000				$ 106,000		$ 100,000	$ 900,000	$ 106,000
Number of properties acquired | property			5						1	5
Number of properties acquired | Property							2				2
Purchase price allocated to buildings			$ 4,873,000				$ 2,000,000		$ 100,000	$ 4,873,000	$ 2,000,000
Purchase price allocated to land			66,047,000				3,100,000		3,900,000	66,047,000	3,100,000
Purchase price allocated to below market lease			5,069,000							5,069,000
Below market lease, carrying amount			29,900,000						29,900,000	29,900,000
Below market lease, accumulated amortization			11,900,000						13,700,000	11,900,000
Accretion income, intangible liabilities									1,800,000	1,900,000	1,700,000
In-Place Leases
Business Acquisition [Line Items]
Purchase price allocated to leases			2,099,000							2,099,000
Above Market Leases
Business Acquisition [Line Items]
Purchase price allocated to leases			0							0
Intangible assets gross carrying amount			1,000,000						1,000,000	1,000,000
Intangible assets, accumulated amortization			996,700						998,200	996,700
Amortization expense of intangible assets									2,000	23,000	45,000
Lease Acquisition Costs
Business Acquisition [Line Items]
Intangible assets gross carrying amount			24,000,000						24,000,000	24,000,000
Intangible assets, accumulated amortization			18,000,000						19,200,000	18,000,000
Amortization expense of intangible assets									$ 1,300,000	1,300,000	$ 2,000,000
1580 Rockville Pike
Business Acquisition [Line Items]
Aggregate cost						$ 8,000,000
Property acquisition costs						$ 200,000
Purchase price allocated to buildings			2,200,000							2,200,000
Purchase price allocated to land			9,600,000							9,600,000
Purchase price allocated to below market lease			4,313,000							4,313,000
1580 Rockville Pike | In-Place Leases
Business Acquisition [Line Items]
Purchase price allocated to leases			513,000							513,000
1580 Rockville Pike | Above Market Leases
Business Acquisition [Line Items]
Purchase price allocated to leases			0							0
1582 Rockville Pike
Business Acquisition [Line Items]
Aggregate cost					$ 11,000,000
Property acquisition costs					$ 200,000
Purchase price allocated to buildings			828,000							828,000
Purchase price allocated to land			9,742,000							9,742,000
Purchase price allocated to below market lease			419,000							419,000
1582 Rockville Pike | In-Place Leases
Business Acquisition [Line Items]
Purchase price allocated to leases			849,000							849,000
1582 Rockville Pike | Above Market Leases
Business Acquisition [Line Items]
Purchase price allocated to leases			0							0
1584 Rockville Pike
Business Acquisition [Line Items]
Aggregate cost			6,200,000
Property acquisition costs			200,000							200,000
Purchase price allocated to buildings			440,000							440,000
Purchase price allocated to land			5,798,000							5,798,000
Purchase price allocated to below market lease			337,000							337,000
1584 Rockville Pike | In-Place Leases
Business Acquisition [Line Items]
Purchase price allocated to leases			249,000							249,000
1584 Rockville Pike | Above Market Leases
Business Acquisition [Line Items]
Purchase price allocated to leases			0							0
750 N. Glebe Road
Business Acquisition [Line Items]
Aggregate cost				$ 40,000,000
Property acquisition costs				$ 400,000
Purchase price allocated to buildings			1,327,000							1,327,000
Purchase price allocated to land			38,224,000							38,224,000
Purchase price allocated to below market lease			0							0
750 N. Glebe Road | In-Place Leases
Business Acquisition [Line Items]
Purchase price allocated to leases			449,000							449,000
750 N. Glebe Road | Above Market Leases
Business Acquisition [Line Items]
Purchase price allocated to leases			0							0
730 N. Glebe Road
Business Acquisition [Line Items]
Aggregate cost			2,800,000
Property acquisition costs			40,400							40,400
Purchase price allocated to buildings			78,000							78,000
Purchase price allocated to land			2,683,000							2,683,000
Purchase price allocated to below market lease			0							0
730 N. Glebe Road | In-Place Leases
Business Acquisition [Line Items]
Purchase price allocated to leases			39,000							39,000
730 N. Glebe Road | Above Market Leases
Business Acquisition [Line Items]
Purchase price allocated to leases			$ 0							$ 0
726 N Glebe Road
Business Acquisition [Line Items]
Aggregate cost	$ 4,000,000
Property acquisition costs	$ 100,000
Kentlands Pad
Business Acquisition [Line Items]
Aggregate cost								$ 4,300,000
Property acquisition costs								$ 100,000
Area of real estate property (in square feet) | ft²								7,100
Hunt Club Pad
Business Acquisition [Line Items]
Aggregate cost							$ 800,000
Area of real estate property (in square feet) | ft²							5,500				5,500
Westview Pad
Business Acquisition [Line Items]
Aggregate cost		$ 900,000
Area of real estate property (in square feet) | a		1.1

Real Estate Acquired - Allocati

Real Estate Acquired - Allocation of Purchase Prices to Acquired Assets and Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Business Acquisition [Line Items]
Land	$ 3,900	$ 66,047	$ 3,100
Buildings	$ 100	4,873	$ 2,000
Below Market Rent		(5,069)
Total Purchase Price		67,950
In-Place Leases
Business Acquisition [Line Items]
Intangible assets		2,099
Above Market Rents
Business Acquisition [Line Items]
Intangible assets		0
1580 Rockville Pike
Business Acquisition [Line Items]
Land		9,600
Buildings		2,200
Below Market Rent		(4,313)
Total Purchase Price		8,000
1580 Rockville Pike | In-Place Leases
Business Acquisition [Line Items]
Intangible assets		513
1580 Rockville Pike | Above Market Rents
Business Acquisition [Line Items]
Intangible assets		0
1582 Rockville Pike
Business Acquisition [Line Items]
Land		9,742
Buildings		828
Below Market Rent		(419)
Total Purchase Price		11,000
1582 Rockville Pike | In-Place Leases
Business Acquisition [Line Items]
Intangible assets		849
1582 Rockville Pike | Above Market Rents
Business Acquisition [Line Items]
Intangible assets		0
750 N. Glebe Road
Business Acquisition [Line Items]
Land		38,224
Buildings		1,327
Below Market Rent		0
Total Purchase Price		40,000
750 N. Glebe Road | In-Place Leases
Business Acquisition [Line Items]
Intangible assets		449
750 N. Glebe Road | Above Market Rents
Business Acquisition [Line Items]
Intangible assets		0
730 N. Glebe Road
Business Acquisition [Line Items]
Land		2,683
Buildings		78
Below Market Rent		0
Total Purchase Price		2,800
730 N. Glebe Road | In-Place Leases
Business Acquisition [Line Items]
Intangible assets		39
730 N. Glebe Road | Above Market Rents
Business Acquisition [Line Items]
Intangible assets		0
1584 Rockville Pike
Business Acquisition [Line Items]
Land		5,798
Buildings		440
Below Market Rent		(337)
Total Purchase Price		6,150
1584 Rockville Pike | In-Place Leases
Business Acquisition [Line Items]
Intangible assets		249
1584 Rockville Pike | Above Market Rents
Business Acquisition [Line Items]
Intangible assets		$ 0

Real Estate Acquired - Amortiza

Real Estate Acquired - Amortization of Intangible Assets and Deferred Income Related to in Place Leases (Detail) $ in Thousands	Dec. 31, 2015USD ($)
Below market leases
2,016	$ 1,719
2,017	1,697
2,018	1,615
2,019	1,478
2,020	1,397
Thereafter	8,236
Total	16,142
Lease Acquisition Costs
Finite-Lived Intangible Assets [Line Items]
2,016	988
2,017	796
2,018	737
2,019	550
2,020	417
Thereafter	1,322
Total	4,810
Above Market Leases
Finite-Lived Intangible Assets [Line Items]
2,016	2
2,017	1
2,018	1
2,019	0
2,020	0
Thereafter	0
Total	$ 4

Noncontrolling Interest - Holde

Noncontrolling Interest - Holders of Convertible Limited Partnership Units in Operating Partnership - Additional Information (Detail) - Noncontrolling Interests - shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Noncontrolling Interest [Line Items]
Percentage of ownership interest of noncontrolling interest	25.80%
Limited partnership units	7,305,758
Limited partnership units, conversion ratio	100.00%
Outstanding stock percent that should be acquired for rights to be exercised	39.90%
Limited partnership units convertible in to shares of common stock, eligible for conversion	1,040,000
Fully converted partnership units and diluted weighted average shares outstanding	28,449,400	27,977,500	27,330,100

Mortgage Notes Payable, Revol48

Mortgage Notes Payable, Revolving Credit Facility, Interest Expense and Amortization of Deferred Debt Costs - Additional Information (Detail) - USD ($)

Apr. 01, 2015

Mar. 03, 2015

Jun. 24, 2014

Oct. 25, 2013

Sep. 04, 2013

May. 28, 2013

Apr. 10, 2013

Mar. 19, 2013

Feb. 27, 2013

Dec. 31, 2015

Dec. 31, 2014

Dec. 31, 2013

Debt Instrument [Line Items]

Outstanding debt

$ 875,200,000

Fixed rate mortgages

802,034,000

$ 808,997,000

Debt outstanding

875,242,000

857,400,000

Debt outstanding with fixed-rate

784,800,000

Debt outstanding with variable-rate

72,600,000

Line of credit facility, maximum borrowing capacity

246,552,000

Outstanding line of credit

28,000,000

43,000,000

Letter of credit facility

448,000

Guarantor obligations, maximum exposure

51,000,000

$ 51,000,000

Long-term debt

$ 250,543,000

Debt instrument fixed interest rate

3.75%

3.65%

Capitalization of debt issuance cost

$ 300,000

$ 1,300,000

$ 3,200,000

Metro Pike Center

Debt Instrument [Line Items]

Interest rate spread on LIBOR

1.65%

Debt instrument amount

$ 15,600,000

Principal amortization period

25 years

Debt instrument required final principal payment

$ 14,800,000

Debt instrument, term

3 years

Existing loan extension period

1 year

Repayment of debt

$ 15,900,000

Northrock

Debt Instrument [Line Items]

Interest rate spread on LIBOR

1.65%

Debt instrument amount

$ 15,000,000

Principal amortization period

25 years

Debt instrument required final principal payment

$ 14,200,000

Debt instrument, term

3 years

Repayment of debt

$ 15,000,000

Cruse Market Place

Debt Instrument [Line Items]

Repayment of debt

$ 6,900,000

4.04% due April 2028 | Hampshire Langley

Debt Instrument [Line Items]

Debt instrument amount

$ 18,000,000

Debt instrument required periodic principal and interest payment

95,400

Debt instrument required final principal payment

$ 9,500,000

Debt instrument fixed interest rate

4.04%

Debt instrument, term

15 years

3.51% due June 2028 | Beacon Center

Debt Instrument [Line Items]

Debt instrument amount

$ 35,000,000

Debt instrument required periodic principal and interest payment

$ 203,200

Principal amortization period

20 years

Debt instrument required final principal payment

$ 11,400,000

Debt instrument fixed interest rate

3.51%

Debt instrument, term

15 years

3.99% due September 2028 | Seabreeze Plaza

Debt Instrument [Line Items]

Debt instrument amount

$ 18,000,000

Debt instrument fixed interest rate

3.99%

Debt instrument, term

15 years

Repayment of debt

$ 13,500,000

Payments of debt extinguishment costs

497,000

4.88% due September 2032 | Park Van Ness

Debt Instrument [Line Items]

Principal amortization period

25 years

Debt instrument fixed interest rate

4.88%

Unsecured Revolving Credit Facility

Debt Instrument [Line Items]

Line of credit facility, maximum borrowing capacity

$ 275,000,000

Extension in line of credit facility period

1 year

1 year

Interest rate spread on LIBOR

1.45%

Fixed Rate Mortgage Notes Payable

Debt Instrument [Line Items]

Fixed rate mortgages

$ 832,441,000

784,757,000

Debt instrument fixed interest rate

[1]

5.53%

Fixed Rate Mortgage Notes Payable | Metro Pike Center Bank Loan

Debt Instrument [Line Items]

Guarantor obligations, maximum exposure

$ 7,800,000

Fixed Rate Mortgage Notes Payable | 5.84% due May 2027

Debt Instrument [Line Items]

Fixed rate mortgages

$ 67,850,000

[2]

69,397,000

Debt instrument fixed interest rate

[1]

5.84%

Fixed Rate Mortgage Notes Payable | 5.84% due May 2027 | Seven Corners Shopping Center

Debt Instrument [Line Items]

Debt instrument amount

$ 73,000,000

Debt instrument required periodic principal and interest payment

$ 463,200

Principal amortization period

25 years

Debt instrument required final principal payment

$ 42,300,000

Fixed Rate Mortgage Notes Payable | 4.04% due April 2028

Debt Instrument [Line Items]

Fixed rate mortgages

$ 16,826,000

[3]

17,281,000

Debt instrument fixed interest rate

[1]

4.04%

Fixed Rate Mortgage Notes Payable | 4.04% due April 2028 | Hampshire Langley

Debt Instrument [Line Items]

Debt instrument required periodic principal and interest payment

$ 95,400

Principal amortization period

25 years

Debt instrument required final principal payment

9,500,000

Fixed Rate Mortgage Notes Payable | 3.51% due June 2028

Debt Instrument [Line Items]

Fixed rate mortgages

$ 31,844,000

[4]

33,140,000

Debt instrument fixed interest rate

[1]

3.51%

Fixed Rate Mortgage Notes Payable | 3.51% due June 2028 | Beacon Center

Debt Instrument [Line Items]

Debt instrument required periodic principal and interest payment

$ 203,200

Principal amortization period

20 years

Debt instrument required final principal payment

$ 11,400,000

Fixed Rate Mortgage Notes Payable | 3.99% due September 2028

Debt Instrument [Line Items]

Fixed rate mortgages

$ 17,011,000

[5]

17,462,000

Debt instrument fixed interest rate

[1]

3.99%

Fixed Rate Mortgage Notes Payable | 3.99% due September 2028 | Seabreeze Plaza

Debt Instrument [Line Items]

Debt instrument required periodic principal and interest payment

$ 94,900

$ 94,900

Principal amortization period

25 years

25 years

Debt instrument required final principal payment

$ 9,500,000

$ 9,500,000

Fixed Rate Mortgage Notes Payable | 4.88% due September 2032

Debt Instrument [Line Items]

Fixed rate mortgages

$ 45,208,000

[6]

5,391,000

Debt instrument fixed interest rate

[1]

4.88%

Fixed Rate Mortgage Notes Payable | 4.88% due September 2032 | Park Van Ness

Debt Instrument [Line Items]

Debt instrument amount

$ 71,600,000

$ 71,600,000

Debt instrument required periodic principal and interest payment

$ 413,500

Principal amortization period

25 years

Debt instrument required final principal payment

$ 39,600,000

Variable Rate Loans Payable

Debt Instrument [Line Items]

Variable rate loans

$ 42,801,000

72,631,000

Interest rate spread on LIBOR

[1]

1.94%

Variable Rate Loans Payable | Unsecured Revolving Credit Facility

Debt Instrument [Line Items]

Variable rate loans

$ 28,000,000

[7]

43,000,000

Line of credit facility, maximum borrowing capacity

$ 275,000,000

Interest rate spread on LIBOR

[1]

1.45%

Variable Rate Loans Payable | Northrock Loan

Debt Instrument [Line Items]

Variable rate loans

$ 0

[8]

14,525,000

Interest rate spread on LIBOR

[1]

1.65%

Variable Rate Loans Payable | Northrock Loan | Northrock

Debt Instrument [Line Items]

Debt instrument required periodic principal and interest payment

$ 47,000

Debt instrument required final principal payment

14,200,000

Variable Rate Loans Payable | Metro Pike Center Bank Loan

Debt Instrument [Line Items]

Variable rate loans

$ 14,801,000

[9]

15,106,000

Interest rate spread on LIBOR

[1]

1.65%

Variable Rate Loans Payable | Metro Pike Center Bank Loan | Metro Pike Center

Debt Instrument [Line Items]

Debt instrument required periodic principal and interest payment

$ 48,000

Debt instrument required final principal payment

14,800,000

Debt Covenant

Debt Instrument [Line Items]

Carrying value of properties collateralized

$ 856,800,000

$ 895,500,000

Debt covenant, percentage of net proceeds of additional equity issuance

80.00%

Credit agreement leverage ratio

60.00%

Interest coverage ratio required minimum

2

Required fixed charge coverage ratio

1.3

Minimum | Unsecured Revolving Credit Facility

Debt Instrument [Line Items]

Interest rate spread on LIBOR

1.45%

Minimum | Debt Covenant

Debt Instrument [Line Items]

Debt covenant required net assets

$ 542,100,000

Maximum | Unsecured Revolving Credit Facility

Debt Instrument [Line Items]

Interest rate spread on LIBOR

2.00%

Shops at Fairfax and Boulevard

Debt Instrument [Line Items]

Debt instrument amount

$ 30,000,000

Debt instrument fixed interest rate

3.69%

Debt instrument, term

15 years

Shops at Fairfax and Boulevard | Fixed Rate Mortgage Notes Payable

Debt Instrument [Line Items]

Debt instrument required periodic principal and interest payment

$ 153,300

Debt instrument required final principal payment

$ 15,500,000

Debt instrument amortization period

25 years

Long-term debt

$ 15,200,000

Northrock

Debt Instrument [Line Items]

Debt instrument amount

$ 16,000,000

Debt instrument fixed interest rate

3.99%

Debt instrument, term

15 years

Northrock | Fixed Rate Mortgage Notes Payable

Debt Instrument [Line Items]

Debt instrument required periodic principal and interest payment

$ 84,400

Debt instrument required final principal payment

$ 8,400,000

Debt instrument amortization period

25 years

Long-term debt

$ 14,500,000

[1]

Interest rate and scheduled maturity data presented as of December 31, 2015. Totals computed using weighted averages.

[2]

The loan in the original amount of $73.0 million closed in May 2012, is collateralized by Seven Corners and requires equal monthly principal and interest payments of $463,200 based upon a 25-year amortization schedule and a final payment of $42.3 million at loan maturity. Principal of $1.5 million was amortized during 2015.

[3]

The loan is collateralized by Hampshire Langley and requires equal monthly principal and interest payments of $95,400 based upon a 25 -year amortization schedule and a final payment of $9.5 million at loan maturity. Principal of $455,000 was amortized in 2015.

[4]

The loan is collateralized by Beacon Center and requires equal monthly principal and interest payments of $203,200 based upon a 20-year amortization schedule and a final payment of $11.4 million at loan maturity. Principal of $1,296,000 was amortized in 2015.

[5]

The loan is collateralized by Seabreeze Plaza and requires equal monthly principal and interest payments of $94,900 based upon a 25-year amortization schedule and a final payment of $9.5 million at loan maturity. Principal of $451,000 was amortized in 2015.

[6]

The loan is a $71.6 million construction-to-permanent facility that is collateralized by and will finance a portion of the construction costs of Park Van Ness. During the construction period, interest will be funded by the loan. After conversion to a permanent loan, monthly principal and interest payments totaling $413,500 will be required based upon a 25-year amortization schedule. A final payment of $39.6 million will be due at maturity.

[7]

The loan is a $275.0 million unsecured revolving credit facility. Interest accrues at a rate equal to the sum of one-month LIBOR plus a spread of 145 basis points. The line may be extended at the Company’s option for one year with payment of a fee of 0.15%. Monthly payments, if required, are interest only and vary depending upon the amount outstanding and the applicable interest rate for any given month.

[8]

The loan was collateralized by Northrock and required monthly principal and interest payments of approximately $47,000 and a final payment of $14.2 million at maturity. In 2015 the loan was repaid in full and replaced with a new $16.0 million loan. See (ff) above.

[9]

The loan is collateralized by Metro Pike Center and requires monthly principal and interest payments of approximately $48,000 and a final payment of $14.8 million at loan maturity. Principal of $305,000 was amortized during 2015.

Mortgage Notes Payable, Revol49

Mortgage Notes Payable, Revolving Credit Facility, Interest Expense and Amortization of Deferred Debt Costs - Summary of Notes Payable (Detail) - USD ($) $ in Thousands		Feb. 27, 2013	Dec. 31, 2015		Dec. 31, 2014
Notes Payable [Line Items]
Fixed rate mortgages			$ 802,034		$ 808,997
Interest rate			3.75%		3.65%
Scheduled maturity period	[1]		8 years 10 months 7 days
Total notes payable			$ 875,242		$ 857,388
Interest rate during period	[1]		5.35%
Fixed Rate Mortgage Notes Payable
Notes Payable [Line Items]
Fixed rate mortgages			$ 832,441		784,757
Interest rate	[1]		5.53%
Scheduled maturity period	[1]		9 years 2 months 14 days
Fixed Rate Mortgage Notes Payable | 7.45% due June 2015
Notes Payable [Line Items]
Fixed rate mortgages			$ 0	[2]	15,399
Interest rate	[1]		7.45%
Fixed Rate Mortgage Notes Payable | 6.01% due February 2018
Notes Payable [Line Items]
Fixed rate mortgages			$ 30,778	[3]	32,049
Interest rate	[1]		6.01%
Fixed Rate Mortgage Notes Payable | 5.88% due January 2019
Notes Payable [Line Items]
Fixed rate mortgages			$ 33,766	[4]	35,398
Interest rate	[1]		5.88%
Fixed Rate Mortgage Notes Payable | 5.76% due May 2019
Notes Payable [Line Items]
Fixed rate mortgages			$ 10,928	[5]	11,454
Interest rate	[1]		5.76%
Fixed Rate Mortgage Notes Payable | 5.62% due July 2019
Notes Payable [Line Items]
Fixed rate mortgages			$ 15,098	[6]	15,819
Interest rate	[1]		5.62%
Fixed Rate Mortgage Notes Payable | 5.79% due September 2019
Notes Payable [Line Items]
Fixed rate mortgages			$ 15,064	[7]	15,761
Interest rate	[1]		5.79%
Fixed Rate Mortgage Notes Payable | 5.22% due January 2020
Notes Payable [Line Items]
Fixed rate mortgages			$ 13,387	[8]	14,014
Interest rate	[1]		5.22%
Fixed Rate Mortgage Notes Payable | 5.60% due May 2020
Notes Payable [Line Items]
Fixed rate mortgages			$ 10,587	[9]	10,881
Interest rate	[1]		5.60%
Fixed Rate Mortgage Notes Payable | 5.30% due June 2020
Notes Payable [Line Items]
Fixed rate mortgages			$ 9,127	[10]	9,535
Interest rate	[1]		5.30%
Fixed Rate Mortgage Notes Payable | 5.83% due July 2020
Notes Payable [Line Items]
Fixed rate mortgages			$ 40,360	[11]	41,441
Interest rate	[1]		5.83%
Fixed Rate Mortgage Notes Payable | 5.81% due February 2021
Notes Payable [Line Items]
Fixed rate mortgages			$ 8,025	[12]	8,346
Interest rate	[1]		5.81%
Fixed Rate Mortgage Notes Payable | 6.01% due August 2021
Notes Payable [Line Items]
Fixed rate mortgages			$ 5,959	[13]	6,100
Interest rate	[1]		6.01%
Fixed Rate Mortgage Notes Payable | 5.62% due June 2022
Notes Payable [Line Items]
Fixed rate mortgages			$ 34,420	[14]	35,222
Interest rate	[1]		5.62%
Fixed Rate Mortgage Notes Payable | 6.08% due September 2022
Notes Payable [Line Items]
Fixed rate mortgages			$ 10,492	[15]	10,718
Interest rate	[1]		6.08%
Fixed Rate Mortgage Notes Payable | 6.43% due April 2023
Notes Payable [Line Items]
Fixed rate mortgages			$ 11,365	[16]	11,587
Interest rate	[1]		6.43%
Fixed Rate Mortgage Notes Payable | 6.28% due February 2024
Notes Payable [Line Items]
Fixed rate mortgages			$ 14,177	[17]	14,909
Interest rate	[1]		6.28%
Fixed Rate Mortgage Notes Payable | 7.35% due June 2024
Notes Payable [Line Items]
Fixed rate mortgages			$ 16,348	[18]	16,750
Interest rate	[1]		7.35%
Fixed Rate Mortgage Notes Payable | 7.60% due June 2024
Notes Payable [Line Items]
Fixed rate mortgages			$ 14,197	[19]	14,535
Interest rate	[1]		7.60%
Fixed Rate Mortgage Notes Payable | 7.02% due July 2024
Notes Payable [Line Items]
Fixed rate mortgages			$ 25,088	[20]	25,639
Interest rate	[1]		7.02%
Fixed Rate Mortgage Notes Payable | 7.45% due July 2024
Notes Payable [Line Items]
Fixed rate mortgages			$ 29,714	[21]	30,429
Interest rate	[1]		7.45%
Fixed Rate Mortgage Notes Payable | 7.30% due January 2025
Notes Payable [Line Items]
Fixed rate mortgages			$ 29,564	[22]	30,253
Interest rate	[1]		7.30%
Fixed Rate Mortgage Notes Payable | 6.18% due January 2026
Notes Payable [Line Items]
Fixed rate mortgages			$ 15,360	[23]	15,735
Interest rate	[1]		6.18%
Fixed Rate Mortgage Notes Payable | 5.31% due April 2026
Notes Payable [Line Items]
Fixed rate mortgages			$ 112,299	[24]	115,291
Interest rate	[1]		5.31%
Fixed Rate Mortgage Notes Payable | 4.30% due October 2026
Notes Payable [Line Items]
Fixed rate mortgages			$ 34,133	[25]	35,125
Interest rate	[1]		4.30%
Fixed Rate Mortgage Notes Payable | 4.53% due November 2026
Notes Payable [Line Items]
Fixed rate mortgages			$ 38,842	[26]	39,932
Interest rate	[1]		4.53%
Fixed Rate Mortgage Notes Payable | 4.70% due December 2026
Notes Payable [Line Items]
Fixed rate mortgages			$ 18,150	[27]	18,645
Interest rate	[1]		4.70%
Fixed Rate Mortgage Notes Payable | 5.84% due May 2027
Notes Payable [Line Items]
Fixed rate mortgages			$ 67,850	[28]	69,397
Interest rate	[1]		5.84%
Fixed Rate Mortgage Notes Payable | 4.04% due April 2028
Notes Payable [Line Items]
Fixed rate mortgages			$ 16,826	[29]	17,281
Interest rate	[1]		4.04%
Fixed Rate Mortgage Notes Payable | 3.51% due June 2028
Notes Payable [Line Items]
Fixed rate mortgages			$ 31,844	[30]	33,140
Interest rate	[1]		3.51%
Fixed Rate Mortgage Notes Payable | 3.99% due September 2028
Notes Payable [Line Items]
Fixed rate mortgages			$ 17,011	[31]	17,462
Interest rate	[1]		3.99%
Fixed Rate Mortgage Notes Payable | 3.69% Due March 2030
Notes Payable [Line Items]
Fixed rate mortgages			$ 29,444	[32]	0
Interest rate	[1]		3.69%
Fixed Rate Mortgage Notes Payable | 3.99% Due April 2030
Notes Payable [Line Items]
Fixed rate mortgages			$ 15,748	[33]	0
Interest rate	[1]		3.99%
Fixed Rate Mortgage Notes Payable | 4.88% due September 2032
Notes Payable [Line Items]
Fixed rate mortgages			$ 45,208	[34]	5,391
Interest rate	[1]		4.88%
Fixed Rate Mortgage Notes Payable | 8.00% due April 2034
Notes Payable [Line Items]
Fixed rate mortgages			$ 11,282	[35]	11,119
Interest rate	[1]		8.00%
Variable Rate Loans Payable
Notes Payable [Line Items]
Variable rate loans			$ 42,801		72,631
Interest rate spread on LIBOR	[1]		1.94%
Scheduled maturity period	[1]		1 year 11 months 15 days
Variable Rate Loans Payable | Revolving credit facility
Notes Payable [Line Items]
Variable rate loans			$ 28,000	[36]	43,000
Interest rate spread on LIBOR	[1]		1.45%
Variable Rate Loans Payable | Northrock Loan
Notes Payable [Line Items]
Variable rate loans			$ 0	[37]	14,525
Interest rate spread on LIBOR	[1]		1.65%
Variable Rate Loans Payable | Metro Pike Center Bank Loan
Notes Payable [Line Items]
Variable rate loans			$ 14,801	[38]	$ 15,106
Interest rate spread on LIBOR	[1]		1.65%
Northrock
Notes Payable [Line Items]
Interest rate spread on LIBOR		1.65%
[1]	Interest rate and scheduled maturity data presented as of December 31, 2015. Totals computed using weighted averages.
[2]	The loan was collateralized by Shops at Fairfax and Boulevard shopping centers and required equal monthly principal and interest payments totaling $156,000 based upon a weighted average 23-year amortization schedule and a final payment of $15.2 million was due at loan maturity. In 2015 the loan was repaid in full and replaced with a new $30.0 million loan. See (ee) below.
[3]	The loan is collateralized by Washington Square and requires equal monthly principal and interest payments of $264,000 based upon a 27.5-year amortization schedule and a final payment of $28.0 million at loan maturity. Principal of $1.3 million was amortized during 2015.
[4]	The loan is collateralized by three shopping centers, Broadlands Village, The Glen and Kentlands Square I, and requires equal monthly principal and interest payments of $306,000 based upon a 25-year amortization schedule and a final payment of $28.4 million at loan maturity. Principal of $1.6 million was amortized during 2015.
[5]	The loan is collateralized by Olde Forte Village and requires equal monthly principal and interest payments of $98,000 based upon a 25-year amortization schedule and a final payment of $9.0 million at loan maturity. Principal of $526,000 was amortized during 2015.
[6]	The loan is collateralized by Countryside and requires equal monthly principal and interest payments of $133,000 based upon a 25-year amortization schedule and a final payment of $12.3 million at loan maturity. Principal of $721,000 was amortized during 2015.
[7]	The loan is collateralized by Briggs Chaney MarketPlace and requires equal monthly principal and interest payments of $133,000 based upon a 25-year amortization schedule and a final payment of $12.2 million at loan maturity. Principal of $697,000 was amortized during 2015.
[8]	The loan is collateralized by Shops at Monocacy and requires equal monthly principal and interest payments of $112,000 based upon a 25-year amortization schedule and a final payment of $10.6 million at loan maturity. Principal of $627,000 was amortized during 2015.
[9]	The loan is collateralized by Boca Valley Plaza and requires equal monthly principal and interest payments of $75,000 based upon a 30-year amortization schedule and a final payment of $9.1 million at loan maturity. Principal of $294,000 was amortized during 2015.
[10]	The loan is collateralized by Palm Springs Center and requires equal monthly principal and interest payments of $75,000 based upon a 25-year amortization schedule and a final payment of $7.1 million at loan maturity. Principal of $408,000 was amortized during 2015.
[11]	The loan and a corresponding interest-rate swap closed on June 29, 2010 and are collateralized by Thruway. On a combined basis, the loan and the interest-rate swap require equal monthly principal and interest payments of $289,000 based upon a 25-year amortization schedule and a final payment of $34.8 million at loan maturity. Principal of $1,081,000 was amortized during 2015.
[12]	The loan is collateralized by Jamestown Place and requires equal monthly principal and interest payments of $66,000 based upon a 25-year amortization schedule and a final payment of $6.1 million at loan maturity. Principal of $321,000 was amortized during 2015.
[13]	The loan is collateralized by Hunt Club Corners and requires equal monthly principal and interest payments of $42,000 based upon a 30-year amortization schedule and a final payment of $5.0 million, at loan maturity. Principal of $141,000 was amortized during 2015.
[14]	The loan is collateralized by Lansdowne Town Center and requires monthly principal and interest payments of $230,000 based on a 30-year amortization schedule and a final payment of $28.2 million at loan maturity. Principal of $802,000 was amortized during 2015.
[15]	The loan is collateralized by Orchard Park and requires equal monthly principal and interest payments of $73,000 based upon a 30-year amortization schedule and a final payment of $8.6 million at loan maturity. Principal of $226,000 was amortized during 2015.
[16]	The loan is collateralized by BJ’s Wholesale and requires equal monthly principal and interest payments of $80,000 based upon a 30-year amortization schedule and a final payment of $9.3 million at loan maturity. Principal of $222,000 was amortized during 2015.
[17]	The loan is collateralized by Great Falls shopping center. The loan consists of three notes which require equal monthly principal and interest payments of $138,000 based upon a weighted average 26-year amortization schedule and a final payment of $6.3 million at maturity. Principal of $732,000 was amortized during 2015.
[18]	The loan is collateralized by Leesburg Pike and requires equal monthly principal and interest payments of $135,000 based upon a 25-year amortization schedule and a final payment of $11.5 million at loan maturity. Principal of $402,000 was amortized during 2015.
[19]	The loan is collateralized by Village Center and requires equal monthly principal and interest payments of $119,000 based upon a 25-year amortization schedule and a final payment of $10.1 million at loan maturity. Principal of $338,000 was amortized during 2015.
[20]	The loan is collateralized by White Oak and requires equal monthly principal and interest payments of $193,000 based upon a 24.4 year weighted amortization schedule and a final payment of $18.5 million at loan maturity. The loan was previously collateralized by Van Ness Square. During 2012, the Company substituted White Oak as the collateral and borrowed an additional $10.5 million. Principal of $551,000 was amortized during 2015.
[21]	The loan is collateralized by Avenel Business Park and requires equal monthly principal and interest payments of $246,000 based upon a 25-year amortization schedule and a final payment of $20.9 million at loan maturity. Principal of $715,000 was amortized during 2015.
[22]	The loan is collateralized by Ashburn Village and requires equal monthly principal and interest payments of $240,000 based upon a 25-year amortization schedule and a final payment of $20.5 million at loan maturity. Principal of $689,000 was amortized during 2015.
[23]	The loan is collateralized by Ravenwood and requires equal monthly principal and interest payments of $111,000 based upon a 25-year amortization schedule and a final payment of $10.1 million at loan maturity. Principal of $375,000 was amortized during 2015.
[24]	The loan is collateralized by Clarendon Center and requires equal monthly principal and interest payments of $753,000 based upon a 25-year amortization schedule and a final payment of $70.5 million at loan maturity. Principal of $3.0 million was amortized during 2015.
[25]	The loan is collateralized by Severna Park MarketPlace and requires equal monthly principal and interest payments of $207,000 based upon a 25-year amortization schedule and a final payment of $20.3 million at loan maturity. Principal of $992,000 was amortized during 2015.
[26]	The loan is collateralized by Kentlands Square II and requires equal monthly principal and interest payments of $240,000 based upon a 25-year amortization schedule and a final payment of $23.1 million at loan maturity. Principal of $1,090,000 was amortized during 2015.
[27]	The loan is collateralized by Cranberry Square and requires equal monthly principal and interest payments of $113,000 based upon a 25-year amortization schedule and a final payment of $10.9 million at loan maturity. Principal of $495,000 was amortized during 2015.
[28]	The loan in the original amount of $73.0 million closed in May 2012, is collateralized by Seven Corners and requires equal monthly principal and interest payments of $463,200 based upon a 25-year amortization schedule and a final payment of $42.3 million at loan maturity. Principal of $1.5 million was amortized during 2015.
[29]	The loan is collateralized by Hampshire Langley and requires equal monthly principal and interest payments of $95,400 based upon a 25 -year amortization schedule and a final payment of $9.5 million at loan maturity. Principal of $455,000 was amortized in 2015.
[30]	The loan is collateralized by Beacon Center and requires equal monthly principal and interest payments of $203,200 based upon a 20-year amortization schedule and a final payment of $11.4 million at loan maturity. Principal of $1,296,000 was amortized in 2015.
[31]	The loan is collateralized by Seabreeze Plaza and requires equal monthly principal and interest payments of $94,900 based upon a 25-year amortization schedule and a final payment of $9.5 million at loan maturity. Principal of $451,000 was amortized in 2015.
[32]	The loan is collateralized by Shops at Fairfax and Boulevard shopping centers and requires equal monthly principal and interest payments totaling $153,300 based upon a 25-year amortization schedule and a final payment of $15.5 million at maturity. Principal of $556,000 was amortized in 2015.
[33]	The loan is collateralized by Northrock and requires equal monthly principal and interest payments totaling $84,400 based upon a 25-year amortization schedule and a final payment of $8.4 million at maturity. Principal of $252,000 was amortized in 2015.
[34]	The loan is a $71.6 million construction-to-permanent facility that is collateralized by and will finance a portion of the construction costs of Park Van Ness. During the construction period, interest will be funded by the loan. After conversion to a permanent loan, monthly principal and interest payments totaling $413,500 will be required based upon a 25-year amortization schedule. A final payment of $39.6 million will be due at maturity.
[35]	The Company entered into a sale-leaseback transaction with its Olney property and is accounting for that transaction as a secured financing. The arrangement requires monthly payments of $60,400 which increase by 1.5% on May 1, 2015, and every May 1 thereafter. The arrangement provides for a final payment of $14.7 million and has an implicit interest rate of 8.0%. Negative amortization in 2015 totaled $163,000.
[36]	The loan is a $275.0 million unsecured revolving credit facility. Interest accrues at a rate equal to the sum of one-month LIBOR plus a spread of 145 basis points. The line may be extended at the Company’s option for one year with payment of a fee of 0.15%. Monthly payments, if required, are interest only and vary depending upon the amount outstanding and the applicable interest rate for any given month.
[37]	The loan was collateralized by Northrock and required monthly principal and interest payments of approximately $47,000 and a final payment of $14.2 million at maturity. In 2015 the loan was repaid in full and replaced with a new $16.0 million loan. See (ff) above.
[38]	The loan is collateralized by Metro Pike Center and requires monthly principal and interest payments of approximately $48,000 and a final payment of $14.8 million at loan maturity. Principal of $305,000 was amortized during 2015.

Mortgage Notes Payable, Revol50

Mortgage Notes Payable, Revolving Credit Facility, Interest Expense and Amortization of Deferred Debt Costs - Summary of Notes Payable (Additional Information) (Detail)		Oct. 25, 2013USD ($)	Sep. 04, 2013USD ($)	May. 28, 2013USD ($)	Mar. 19, 2013USD ($)	Feb. 27, 2013USD ($)	Dec. 31, 2015USD ($)noteStore	Dec. 31, 2014	Dec. 31, 2012USD ($)
Notes Payable [Line Items]
Interest rate							3.75%	3.65%
Line of credit facility, maximum borrowing capacity							$ 246,552,000
Northrock
Notes Payable [Line Items]
Amortization period						25 years
Debt instrument final payment						$ 14,200,000
Debt instrument amount						$ 15,000,000
Interest rate spread on LIBOR						1.65%
Metro Pike Center
Notes Payable [Line Items]
Amortization period						25 years
Debt instrument final payment						$ 14,800,000
Debt instrument amount						$ 15,600,000
Interest rate spread on LIBOR						1.65%
4.04% due April 2028 | Hampshire Langley
Notes Payable [Line Items]
Principal and interest payments					$ 95,400
Debt instrument final payment					9,500,000
Debt instrument amount					$ 18,000,000
3.51% due June 2028 | Beacon Center
Notes Payable [Line Items]
Principal and interest payments				$ 203,200
Amortization period				20 years
Debt instrument final payment				$ 11,400,000
Debt instrument amount				$ 35,000,000
3.99% due September 2028 | Seabreeze Plaza
Notes Payable [Line Items]
Debt instrument amount			$ 18,000,000
4.88% due September 2032 | Park Van Ness
Notes Payable [Line Items]
Amortization period		25 years
Fixed Rate Mortgage Notes Payable
Notes Payable [Line Items]
Interest rate	[1]						5.53%
Fixed Rate Mortgage Notes Payable | 7.45% due June 2015
Notes Payable [Line Items]
Interest rate	[1]						7.45%
Fixed Rate Mortgage Notes Payable | 7.45% due June 2015 | Shops at Fairfax and Boulevard
Notes Payable [Line Items]
Principal and interest payments							$ 156,000
Amortization period							23 years
Debt instrument final payment							$ 15,200,000
Fixed Rate Mortgage Notes Payable | 6.01% due February 2018
Notes Payable [Line Items]
Interest rate	[1]						6.01%
Fixed Rate Mortgage Notes Payable | 6.01% due February 2018 | Washington Square
Notes Payable [Line Items]
Principal and interest payments							$ 264,000
Amortization period							27 years 6 months
Debt instrument final payment							$ 28,000,000
Amortization of principal							$ 1,300,000
Fixed Rate Mortgage Notes Payable | 5.88% due January 2019
Notes Payable [Line Items]
Interest rate	[1]						5.88%
Fixed Rate Mortgage Notes Payable | 5.88% due January 2019 | Broadlands Village, The Glen and Kentlands Square I
Notes Payable [Line Items]
Principal and interest payments							$ 306,000
Amortization period							25 years
Debt instrument final payment							$ 28,400,000
Amortization of principal							$ 1,600,000
Number of shopping centers | Store							3
Fixed Rate Mortgage Notes Payable | 5.76% due May 2019
Notes Payable [Line Items]
Interest rate	[1]						5.76%
Fixed Rate Mortgage Notes Payable | 5.76% due May 2019 | Olde Forte Village
Notes Payable [Line Items]
Principal and interest payments							$ 98,000
Amortization period							25 years
Debt instrument final payment							$ 9,000,000
Amortization of principal							$ 526,000
Fixed Rate Mortgage Notes Payable | 5.62% due July 2019
Notes Payable [Line Items]
Interest rate	[1]						5.62%
Fixed Rate Mortgage Notes Payable | 5.62% due July 2019 | Countryside
Notes Payable [Line Items]
Principal and interest payments							$ 133,000
Amortization period							25 years
Debt instrument final payment							$ 12,300,000
Amortization of principal							$ 721,000
Fixed Rate Mortgage Notes Payable | 5.79% due September 2019
Notes Payable [Line Items]
Interest rate	[1]						5.79%
Fixed Rate Mortgage Notes Payable | 5.79% due September 2019 | Briggs Chancy MarketPlace
Notes Payable [Line Items]
Principal and interest payments							$ 133,000
Amortization period							25 years
Debt instrument final payment							$ 12,200,000
Amortization of principal							$ 697,000
Fixed Rate Mortgage Notes Payable | 5.22% due January 2020
Notes Payable [Line Items]
Interest rate	[1]						5.22%
Fixed Rate Mortgage Notes Payable | 5.22% due January 2020 | Shops at Monocacy
Notes Payable [Line Items]
Principal and interest payments							$ 112,000
Amortization period							25 years
Debt instrument final payment							$ 10,600,000
Amortization of principal							$ 627,000
Fixed Rate Mortgage Notes Payable | 5.60% due May 2020
Notes Payable [Line Items]
Interest rate	[1]						5.60%
Fixed Rate Mortgage Notes Payable | 5.60% due May 2020 | Boca Valley Plaza
Notes Payable [Line Items]
Principal and interest payments							$ 75,000
Amortization period							30 years
Debt instrument final payment							$ 9,100,000
Amortization of principal							$ 294,000
Fixed Rate Mortgage Notes Payable | 5.30% due June 2020
Notes Payable [Line Items]
Interest rate	[1]						5.30%
Fixed Rate Mortgage Notes Payable | 5.30% due June 2020 | Palm Springs Center
Notes Payable [Line Items]
Principal and interest payments							$ 75,000
Amortization period							25 years
Debt instrument final payment							$ 7,100,000
Amortization of principal							$ 408,000
Fixed Rate Mortgage Notes Payable | 5.83% due July 2020
Notes Payable [Line Items]
Interest rate	[1]						5.83%
Fixed Rate Mortgage Notes Payable | 5.83% due July 2020 | Thruway
Notes Payable [Line Items]
Principal and interest payments							$ 289,000
Amortization period							25 years
Debt instrument final payment							$ 34,800,000
Amortization of principal							$ 1,081,000
Fixed Rate Mortgage Notes Payable | 5.81% due February 2021
Notes Payable [Line Items]
Interest rate	[1]						5.81%
Fixed Rate Mortgage Notes Payable | 5.81% due February 2021 | Jamestown Place
Notes Payable [Line Items]
Principal and interest payments							$ 66,000
Amortization period							25 years
Debt instrument final payment							$ 6,100,000
Amortization of principal							$ 321,000
Fixed Rate Mortgage Notes Payable | 6.01% due August 2021
Notes Payable [Line Items]
Interest rate	[1]						6.01%
Fixed Rate Mortgage Notes Payable | 6.01% due August 2021 | Hunt Club Corners
Notes Payable [Line Items]
Principal and interest payments							$ 42,000
Amortization period							30 years
Debt instrument final payment							$ 5,000,000
Amortization of principal							$ 141,000
Fixed Rate Mortgage Notes Payable | 5.62% due June 2022
Notes Payable [Line Items]
Interest rate	[1]						5.62%
Fixed Rate Mortgage Notes Payable | 5.62% due June 2022 | Landsowne Town Center
Notes Payable [Line Items]
Principal and interest payments							$ 230,000
Amortization period							30 years
Debt instrument final payment							$ 28,200,000
Amortization of principal							$ 802,000
Fixed Rate Mortgage Notes Payable | 6.08% due September 2022
Notes Payable [Line Items]
Interest rate	[1]						6.08%
Fixed Rate Mortgage Notes Payable | 6.08% due September 2022 | Orchard Park
Notes Payable [Line Items]
Principal and interest payments							$ 73,000
Amortization period							30 years
Debt instrument final payment							$ 8,600,000
Amortization of principal							$ 226,000
Fixed Rate Mortgage Notes Payable | 6.43% due April 2023
Notes Payable [Line Items]
Interest rate	[1]						6.43%
Fixed Rate Mortgage Notes Payable | 6.43% due April 2023 | BJs Wholesale
Notes Payable [Line Items]
Principal and interest payments							$ 80,000
Amortization period							30 years
Debt instrument final payment							$ 9,300,000
Amortization of principal							$ 222,000
Fixed Rate Mortgage Notes Payable | 6.28% due February 2024
Notes Payable [Line Items]
Interest rate	[1]						6.28%
Fixed Rate Mortgage Notes Payable | 6.28% due February 2024 | Great Falls Shopping Center
Notes Payable [Line Items]
Principal and interest payments							$ 138,000
Amortization period							26 years
Debt instrument final payment							$ 6,300,000
Amortization of principal							$ 732,000
Number of notes | note							3
Fixed Rate Mortgage Notes Payable | 7.35% due June 2024
Notes Payable [Line Items]
Interest rate	[1]						7.35%
Fixed Rate Mortgage Notes Payable | 7.35% due June 2024 | Leesburg Pike
Notes Payable [Line Items]
Principal and interest payments							$ 135,000
Amortization period							25 years
Debt instrument final payment							$ 11,500,000
Amortization of principal							$ 402,000
Fixed Rate Mortgage Notes Payable | 7.60% due June 2024
Notes Payable [Line Items]
Interest rate	[1]						7.60%
Fixed Rate Mortgage Notes Payable | 7.60% due June 2024 | Village Center
Notes Payable [Line Items]
Principal and interest payments							$ 119,000
Amortization period							25 years
Debt instrument final payment							$ 10,100,000
Amortization of principal							$ 338,000
Fixed Rate Mortgage Notes Payable | 7.02% due July 2024
Notes Payable [Line Items]
Interest rate	[1]						7.02%
Fixed Rate Mortgage Notes Payable | 7.02% due July 2024 | White Oak Shopping Center
Notes Payable [Line Items]
Principal and interest payments							$ 193,000
Amortization period							24 years 4 months 24 days
Debt instrument final payment							$ 18,500,000
Amortization of principal							$ 551,000
Debt instrument amount									$ 10,500,000
Fixed Rate Mortgage Notes Payable | 7.45% due July 2024
Notes Payable [Line Items]
Interest rate	[1]						7.45%
Fixed Rate Mortgage Notes Payable | 7.45% due July 2024 | Avenel Business Park
Notes Payable [Line Items]
Principal and interest payments							$ 246,000
Amortization period							25 years
Debt instrument final payment							$ 20,900,000
Amortization of principal							$ 715,000
Fixed Rate Mortgage Notes Payable | 7.30% due January 2025
Notes Payable [Line Items]
Interest rate	[1]						7.30%
Fixed Rate Mortgage Notes Payable | 7.30% due January 2025 | Ashburn Village
Notes Payable [Line Items]
Principal and interest payments							$ 240,000
Amortization period							25 years
Debt instrument final payment							$ 20,500,000
Amortization of principal							$ 689,000
Fixed Rate Mortgage Notes Payable | 6.18% due January 2026
Notes Payable [Line Items]
Interest rate	[1]						6.18%
Fixed Rate Mortgage Notes Payable | 6.18% due January 2026 | Ravenwood
Notes Payable [Line Items]
Principal and interest payments							$ 111,000
Amortization period							25 years
Debt instrument final payment							$ 10,100,000
Amortization of principal							$ 375,000
Fixed Rate Mortgage Notes Payable | 5.31% due April 2026
Notes Payable [Line Items]
Interest rate	[1]						5.31%
Fixed Rate Mortgage Notes Payable | 5.31% due April 2026 | Clarendon Center
Notes Payable [Line Items]
Principal and interest payments							$ 753,000
Amortization period							25 years
Debt instrument final payment							$ 70,500,000
Amortization of principal							$ 3,000,000
Fixed Rate Mortgage Notes Payable | 4.30% due October 2026
Notes Payable [Line Items]
Interest rate	[1]						4.30%
Fixed Rate Mortgage Notes Payable | 4.30% due October 2026 | Severna Park Market Place
Notes Payable [Line Items]
Principal and interest payments							$ 207,000
Amortization period							25 years
Debt instrument final payment							$ 20,300,000
Amortization of principal							$ 992,000
Fixed Rate Mortgage Notes Payable | 4.53% due November 2026
Notes Payable [Line Items]
Interest rate	[1]						4.53%
Fixed Rate Mortgage Notes Payable | 4.53% due November 2026 | Kentlands Square II
Notes Payable [Line Items]
Principal and interest payments							$ 240,000
Amortization period							25 years
Debt instrument final payment							$ 23,100,000
Amortization of principal							$ 1,090,000
Fixed Rate Mortgage Notes Payable | 4.70% due December 2026
Notes Payable [Line Items]
Interest rate	[1]						4.70%
Fixed Rate Mortgage Notes Payable | 4.70% due December 2026 | Cranberry Square
Notes Payable [Line Items]
Principal and interest payments							$ 113,000
Amortization period							25 years
Debt instrument final payment							$ 10,900,000
Amortization of principal							$ 495,000
Fixed Rate Mortgage Notes Payable | 5.84% due May 2027
Notes Payable [Line Items]
Interest rate	[1]						5.84%
Fixed Rate Mortgage Notes Payable | 5.84% due May 2027 | Seven Corners
Notes Payable [Line Items]
Principal and interest payments							$ 463,200
Amortization period							25 years
Debt instrument final payment							$ 42,300,000
Amortization of principal							1,500,000
Debt instrument amount							$ 73,000,000
Fixed Rate Mortgage Notes Payable | 4.04% due April 2028
Notes Payable [Line Items]
Interest rate	[1]						4.04%
Fixed Rate Mortgage Notes Payable | 4.04% due April 2028 | Hampshire Langley
Notes Payable [Line Items]
Principal and interest payments							$ 95,400
Amortization period					25 years
Debt instrument final payment							9,500,000
Amortization of principal							$ 455,000
Fixed Rate Mortgage Notes Payable | 3.51% due June 2028
Notes Payable [Line Items]
Interest rate	[1]						3.51%
Fixed Rate Mortgage Notes Payable | 3.51% due June 2028 | Beacon Center
Notes Payable [Line Items]
Principal and interest payments							$ 203,200
Amortization period							20 years
Debt instrument final payment							$ 11,400,000
Amortization of principal							$ 1,296,000
Fixed Rate Mortgage Notes Payable | 3.99% due September 2028
Notes Payable [Line Items]
Interest rate	[1]						3.99%
Fixed Rate Mortgage Notes Payable | 3.99% due September 2028 | Seabreeze Plaza
Notes Payable [Line Items]
Principal and interest payments			$ 94,900				$ 94,900
Amortization period			25 years				25 years
Debt instrument final payment			$ 9,500,000				$ 9,500,000
Amortization of principal							$ 451,000
Fixed Rate Mortgage Notes Payable | 3.69% Due March 2030
Notes Payable [Line Items]
Interest rate	[1]						3.69%
Fixed Rate Mortgage Notes Payable | 3.69% Due March 2030 | Shops at Fairfax and Boulevard
Notes Payable [Line Items]
Principal and interest payments							$ 153,300
Amortization period							25 years
Debt instrument final payment							$ 15,500,000
Amortization of principal							556,000
Debt instrument amount							$ 30,000,000
Fixed Rate Mortgage Notes Payable | 3.99% Due April 2030
Notes Payable [Line Items]
Interest rate	[1]						3.99%
Fixed Rate Mortgage Notes Payable | 3.99% Due April 2030 | Northrock
Notes Payable [Line Items]
Principal and interest payments							$ 84,400
Amortization period							25 years
Debt instrument final payment							$ 8,400,000
Amortization of principal							252,000
Debt instrument amount							$ 16,000,000
Fixed Rate Mortgage Notes Payable | 4.88% due September 2032
Notes Payable [Line Items]
Interest rate	[1]						4.88%
Fixed Rate Mortgage Notes Payable | 4.88% due September 2032 | Park Van Ness
Notes Payable [Line Items]
Principal and interest payments							$ 413,500
Amortization period							25 years
Debt instrument final payment							$ 39,600,000
Debt instrument amount		$ 71,600,000					$ 71,600,000
Fixed Rate Mortgage Notes Payable | 8.00% due April 2034
Notes Payable [Line Items]
Interest rate	[1]						8.00%
Fixed Rate Mortgage Notes Payable | 8.00% due April 2034 | Olney
Notes Payable [Line Items]
Principal and interest payments							$ 60,400
Debt instrument final payment							$ 14,700,000
Fixed rate increase on note							1.50%
Interest rate							8.00%
Amortization of debt discount (premium)							$ (163,000)
Variable Rate Loans Payable
Notes Payable [Line Items]
Interest rate spread on LIBOR	[1]						1.94%
Variable Rate Loans Payable | Revolving credit facility
Notes Payable [Line Items]
Line of credit facility, maximum borrowing capacity							$ 275,000,000
Debt maturity extension period							1 year
Debt instrument fee							0.15%
Interest rate spread on LIBOR	[1]						1.45%
Debt instrument frequency of periodic payment							Monthly
Variable Rate Loans Payable | Northrock Loan
Notes Payable [Line Items]
Interest rate spread on LIBOR	[1]						1.65%
Variable Rate Loans Payable | Northrock Loan | Northrock
Notes Payable [Line Items]
Principal and interest payments							$ 47,000
Debt instrument final payment							$ 14,200,000
Variable Rate Loans Payable | Metro Pike Center Bank Loan
Notes Payable [Line Items]
Interest rate spread on LIBOR	[1]						1.65%
Variable Rate Loans Payable | Metro Pike Center Bank Loan | Metro Pike Center
Notes Payable [Line Items]
Principal and interest payments							$ 48,000
Debt instrument final payment							14,800,000
Amortization of principal							$ 305,000
[1]	Interest rate and scheduled maturity data presented as of December 31, 2015. Totals computed using weighted averages.

Mortgage Notes Payable, Revol51

Mortgage Notes Payable, Revolving Credit Facility, Interest Expense and Amortization of Deferred Debt Costs - Scheduled Maturities of All Debt, Including Scheduled Principal Amortization (Detail) - USD ($) $ in Thousands		Dec. 31, 2015	Dec. 31, 2014
Balloon Payments
2,016		$ 0
2,017		14,430
2,018	[1]	55,748
2,019		60,793
2,020		61,163
Thereafter		432,565
Balloon Payments		624,699
Outstanding line of credit		28,000	$ 43,000
Scheduled Principal Amortization
2,016		24,655
2,017		25,798
2,018		25,903
2,019		24,616
2,020		21,893
Thereafter		127,678
Scheduled Principal Amortization		250,543
Total
2,016		24,655
2,017		40,228
2,018		81,651
2,019		85,409
2,020		83,056
Thereafter		560,243
Total		$ 875,242	$ 857,400
[1]	Includes $28.0 million outstanding under the line of credit.

Mortgage Notes Payable, Revol52

Mortgage Notes Payable, Revolving Credit Facility, Interest Expense and Amortization of Deferred Debt Costs - Interest Expense and Amortization of Deferred Debt Costs (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Debt Disclosure [Abstract]
Interest incurred	$ 45,898	$ 45,396	$ 45,502
Amortization of deferred debt costs	1,433	1,327	1,257
Capitalized interest	(2,166)	(689)	(170)
Total	$ 45,165	$ 46,034	$ 46,589

Lease Agreements - Additional I

Lease Agreements - Additional Information (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Leases [Abstract]
Base rent (including straight-line rent)	$ 168,303	$ 164,599	$ 159,898
Expense recoveries	32,911	32,132	30,949
Percentage rent	$ 1,608	$ 1,492	$ 1,575

Lease Agreements - Future Contr

Lease Agreements - Future Contractual Payments Under Noncancelable Leases (Detail) $ in Thousands	Dec. 31, 2015USD ($)
Leases [Abstract]
2,016	$ 154,983
2,017	140,786
2,018	122,922
2,019	100,845
2,020	80,559
Thereafter	273,328
Total future contractual payments	$ 873,423

Long Term Lease Obligations - A

Long Term Lease Obligations - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2015USD ($)property	Dec. 31, 2014USD ($)	Dec. 31, 2013USD ($)	Dec. 31, 2012
Leases Disclosure [Line Items]
Minimum rental obligations	$ 176,000	$ 176,000	$ 176,000
Lease extension period				5 years
Percentage of annual increase in base rent				3.00%
Rent expense	$ 904,900	$ 840,800	$ 850,600
90-year Ground Leasehold Interest
Leases Disclosure [Line Items]
Ground leasehold interest period	90 years
Minimum annual lease rent over lease term	$ 1
99-year Ground Lease
Leases Disclosure [Line Items]
Ground leasehold interest period	99 years
Minimum annual lease rent over lease term	$ 1
Percent of underlying land held under a 99-year ground lease	3.40%
Flagship Center
Leases Disclosure [Line Items]
Number of developed parcels | property	2
Minimum
Leases Disclosure [Line Items]
Lease expiration year	2,058
Maximum
Leases Disclosure [Line Items]
Lease expiration year	2,068

Long-Term Lease Obligations - F

Long-Term Lease Obligations - Future Minimum Rental Commitments Under Ground Leases (Detail) $ in Thousands	Dec. 31, 2015USD ($)
Leases Future Minimum Payments [Line Items]
2,016	$ 176
2,017	176
2,018	176
2,019	177
2,020	182
Thereafter	9,004
Total	9,891
Beacon Center
Leases Future Minimum Payments [Line Items]
2,016	60
2,017	60
2,018	60
2,019	60
2,020	60
Thereafter	2,482
Total	2,782
Olney
Leases Future Minimum Payments [Line Items]
2,016	56
2,017	56
2,018	56
2,019	57
2,020	62
Thereafter	3,697
Total	3,984
Southdale
Leases Future Minimum Payments [Line Items]
2,016	60
2,017	60
2,018	60
2,019	60
2,020	60
Thereafter	2,825
Total	$ 3,125

Stockholders' Equity and Nonc57

Stockholders' Equity and Noncontrolling Interest - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	Nov. 12, 2014	Feb. 12, 2013	Mar. 31, 2013	Mar. 31, 2008	Nov. 30, 2003	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Class of Stock [Line Items]
Income attributable to noncontrolling interests						$ 10,463	$ 11,045	$ 3,970
Series A Preferred Stock
Class of Stock [Line Items]
Number of depositary shares sold					4,000,000
Dividend rate on preferred stock					8.00%
Depositary shares, redeemable price (in usd per share)					$ 25
Annual dividend on depositary shares					2
Cumulative redeemable preferred stock liquidation preference					$ 25
Percentage of redeemable preferred stock			60.00%
Depository shares to cumulative redeemable preferred stock ratio					1.00%
Series B Preferred Stock
Class of Stock [Line Items]
Number of depositary shares sold				3,173,115
Dividend rate on preferred stock				9.00%
Depositary shares, redeemable price (in usd per share)				$ 25
Annual dividend on depositary shares				2.25
Cumulative redeemable preferred stock liquidation preference				$ 25
Depository shares to cumulative redeemable preferred stock ratio				1.00%
Series C Preferred Stock
Class of Stock [Line Items]
Number of depositary shares sold	1,600,000	5,600,000
Dividend rate on preferred stock		6.875%
Annual dividend on depositary shares		$ 1.71875
Cumulative redeemable preferred stock liquidation preference		$ 25
Percentage of redeemable preferred stock		6.875%
Depository shares to cumulative redeemable preferred stock ratio		1.00%
Series C preferred stock	$ 39,260	$ 135,200				$ 0	$ 39,260	$ 135,221

Related Party Transactions - Ad

Related Party Transactions - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2015USD ($)	Dec. 31, 2014USD ($)	Dec. 31, 2013USD ($)	Sep. 04, 2012USD ($)
Related Party Transactions [Abstract]
Company contribution to a multi employer 401K plan at discretionary amount of employee's cash compensation, maximum percentage	6.00%
Company contribution to a multi employer 401K plan at discretionary amount of employee's cash compensation, amount	$ 400,000	$ 379,000	$ 369,000
Deferred compensation, employee contribution, percentage	2.00%
Deferred compensation, employer contribution, percentage	3	3	3
Deferred compensation, company contribution, amount	$ 224,900	$ 192,800	$ 191,300
Deferred compensation, cumulative unfunded liability	1,800,000	1,800,000
Ancillary costs and expenses	8,200,000	7,400,000	6,300,000
Liability due to the Saul Organization for the company's share of these ancillary costs and expenses	655,000	543,000
Insurance commissions and fees expense	$ 443,500	427,300	447,300
Monthly consulting fees				$ 60,000
Consulting fees		$ 495,000	$ 720,000

Stock Option Plan - Additional

Stock Option Plan - Additional Information (Detail)

May. 08, 2015USD ($)person$ / sharesshares

May. 09, 2014USD ($)person$ / sharesshares

May. 10, 2013USD ($)person$ / sharesshares

May. 04, 2012USD ($)person$ / sharesshares

May. 13, 2011USD ($)person$ / sharesshares

May. 07, 2010USD ($)person$ / sharesshares

Apr. 24, 2009USD ($)person$ / sharesshares

Apr. 25, 2008USD ($)person$ / sharesshares

Apr. 27, 2007USD ($)person$ / sharesshares

May. 01, 2006USD ($)person$ / sharesshares

Dec. 31, 2015USD ($)$ / shares

Dec. 31, 2014$ / shares

Dec. 31, 2013$ / shares

Dec. 31, 2004shares

Dec. 31, 1993shares

Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]

Exercise price of options (in usd per share) | $ / shares

$ 51.07

$ 47.03

$ 44.42

Fair value stock option grant | $

$ 10,822,000

the 1993 Plan | Stock Options

Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]

Authorized shares for a grant

400,000

Amended 2004 Plan | Stock Options

Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]

Authorized shares for a grant

2,000,000

Amended 2004 Plan | Stock Options | Director

Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]

Authorized shares for a grant

200,000

2006 Options

Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]

Exercise price of options (in usd per share) | $ / shares

$ 40.35

Fair value stock option grant | $

$ 143,400

2006 Options | Director

Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]

Number of individuals granted options | person

12

2006 Options | Stock Options | Officer

Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]

Options granted to purchase stocks (in shares)

0

2006 Options | Stock Options | Director

Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]

Options granted to purchase stocks (in shares)

30,000

2007 Options

Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]

Exercise price of options (in usd per share) | $ / shares

$ 54.17

Fair value stock option grant | $

$ 1,500,000

2007 Options | Officer

Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]

Number of individuals granted options | person

13

Options vested (in percent)

25.00%

Fair value stock option grant | $

$ 1,300,000

2007 Options | Director

Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]

Number of individuals granted options | person

12

Fair value stock option grant | $

$ 285,300

2007 Options | Stock Options

Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]

Options granted to purchase stocks (in shares)

165,000

2007 Options | Stock Options | Officer

Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]

Option vesting period

4 years

2007 Options | Incentive Stock Option

Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]

Options granted to purchase stocks (in shares)

27,560

2007 Options | Nonqualified Stock Options

Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]

Options granted to purchase stocks (in shares)

137,440

2008 Options

Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]

Exercise price of options (in usd per share) | $ / shares

$ 50.15

Fair value stock option grant | $

$ 254,700

2008 Options | Director

Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]

Number of individuals granted options | person

12

2008 Options | Stock Options | Officer

Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]

Options granted to purchase stocks (in shares)

0

2008 Options | Stock Options | Director

Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]

Options granted to purchase stocks (in shares)

30,000

2009 Options

Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]

Exercise price of options (in usd per share) | $ / shares

$ 32.68

Fair value stock option grant | $

$ 222,950

2009 Options | Director

Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]

Number of individuals granted options | person

13

2009 Options | Stock Options | Officer

Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]

Options granted to purchase stocks (in shares)

0

2009 Options | Stock Options | Director

Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]

Options granted to purchase stocks (in shares)

32,500

2010 Options

Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]

Exercise price of options (in usd per share) | $ / shares

$ 38.76

Fair value stock option grant | $

$ 287,950

2010 Options | Director

Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]

Number of individuals granted options | person

13

2010 Options | Stock Options | Officer

Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]

Options granted to purchase stocks (in shares)

0

2010 Options | Stock Options | Director

Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]

Options granted to purchase stocks (in shares)

32,500

2011 Options

Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]

Exercise price of options (in usd per share) | $ / shares

$ 41.82

Fair value stock option grant | $

$ 1,600,000

2011 Options | Officer

Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]

Number of individuals granted options | person

15

Options vested (in percent)

25.00%

Fair value stock option grant | $

$ 1,300,000

2011 Options | Director

Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]

Number of individuals granted options | person

13

Fair value stock option grant | $

$ 297,375

2011 Options | Stock Options

Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]

Options granted to purchase stocks (in shares)

195,000

2011 Options | Stock Options | Officer

Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]

Option vesting period

4 years

2011 Options | Incentive Stock Option

Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]

Options granted to purchase stocks (in shares)

65,300

2011 Options | Nonqualified Stock Options

Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]

Options granted to purchase stocks (in shares)

129,700

2012 Options

Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]

Exercise price of options (in usd per share) | $ / shares

$ 39.29

Fair value stock option grant | $

$ 1,700,000

2012 Options | Officer

Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]

Number of individuals granted options | person

15

Options vested (in percent)

25.00%

Fair value stock option grant | $

$ 1,400,000

2012 Options | Director

Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]

Number of individuals granted options | person

14

Fair value stock option grant | $

$ 257,250

2012 Options | Stock Options

Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]

Options granted to purchase stocks (in shares)

277,500

2012 Options | Stock Options | Officer

Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]

Option vesting period

4 years

2012 Options | Incentive Stock Option

Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]

Options granted to purchase stocks (in shares)

26,157

2012 Options | Nonqualified Stock Options

Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]

Options granted to purchase stocks (in shares)

251,343

2013 Options

Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]

Number of individuals granted options | person

15

Exercise price of options (in usd per share) | $ / shares

$ 44.42

Fair value stock option grant | $

$ 1,500,000

2013 Options | Officer

Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]

Options vested (in percent)

25.00%

Fair value stock option grant | $

$ 1,300,000

2013 Options | Director

Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]

Number of individuals granted options | person

14

Fair value stock option grant | $

$ 300,000

2013 Options | Stock Options

Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]

Options granted to purchase stocks (in shares)

237,500

2013 Options | Stock Options | Officer

Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]

Option vesting period

4 years

2013 Options | Incentive Stock Option

Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]

Options granted to purchase stocks (in shares)

35,592

2013 Options | Nonqualified Stock Options

Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]

Options granted to purchase stocks (in shares)

201,908

2014 Options

Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]

Exercise price of options (in usd per share) | $ / shares

$ 47.03

Fair value stock option grant | $

$ 1,300,000

2014 Options | Officer

Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]

Number of individuals granted options | person

18

Options vested (in percent)

25.00%

Fair value stock option grant | $

$ 1,200,000

2014 Options | Director

Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]

Number of individuals granted options | person

12

Fair value stock option grant | $

$ 109,500

2014 Options | Stock Options

Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]

Options granted to purchase stocks (in shares)

200,000

2014 Options | Stock Options | Officer

Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]

Option vesting period

4 years

2014 Options | Incentive Stock Option

Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]

Options granted to purchase stocks (in shares)

29,300

2014 Options | Nonqualified Stock Options

Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]

Options granted to purchase stocks (in shares)

170,700

2015 Options

Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]

Exercise price of options (in usd per share) | $ / shares

$ 51.07

Fair value stock option grant | $

$ 1,600,000

2015 Options | Officer

Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]

Number of individuals granted options | person

19

Options vested (in percent)

25.00%

Fair value stock option grant | $

$ 1,400,000

2015 Options | Director

Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]

Number of individuals granted options | person

14

Fair value stock option grant | $

$ 125,300

2015 Options | Stock Options

Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]

Options granted to purchase stocks (in shares)

225,000

2015 Options | Stock Options | Officer

Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]

Option vesting period

4 years

2015 Options | Incentive Stock Option

Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]

Options granted to purchase stocks (in shares)

33,690

2015 Options | Nonqualified Stock Options

Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]

Options granted to purchase stocks (in shares)

191,310

Stock Option Plan - Stock Optio

Stock Option Plan - Stock Options Issued (Detail)	12 Months Ended
	Dec. 31, 2015USD ($)$ / sharesshares	Dec. 31, 2014USD ($)$ / sharesshares	Dec. 31, 2013USD ($)$ / sharesshares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total grant (in shares) | shares	1,425,000
Vested (in shares) | shares	724,375
Exercised (in shares) | shares	265,976
Forfeited (in shares) | shares	298,750
Exercisable at December 31 (in shares) | shares	435,899	380,708	413,000
Remaining unexercised (in shares) | shares	860,274
Exercise price (in usd per share) | $ / shares	$ 43.67	$ 37.71	$ 33.15
Total value at grant date	$ 10,822,000
Estimated forfeitures	1,911,000
Expensed in previous years	3,588,000
Future expense	2,302,000
Expensed in 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated share based compensation	880,000
Expensed in 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated share based compensation	965,000
Expensed in 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated share based compensation	1,176,000
Directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated share based compensation	$ 143,000	$ 112,900	$ 124,400
Directors | 5/1/2006
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total grant (in shares) | shares	30,000
Vested (in shares) | shares	30,000
Exercised (in shares) | shares	20,000
Forfeited (in shares) | shares	2,500
Exercisable at December 31 (in shares) | shares	7,500
Remaining unexercised (in shares) | shares	7,500
Exercise price (in usd per share) | $ / shares	$ 40.35
Volatility	0.206
Expected life (years)	9 years
Assumed yield	5.93%
Risk-free rate	5.11%
Total value at grant date	$ 144,000
Expensed in previous years	144,000
Future expense	0
Directors | 5/1/2006 | Expensed in 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated share based compensation	0
Directors | 5/1/2006 | Expensed in 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated share based compensation	0
Directors | 5/1/2006 | Expensed in 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated share based compensation	$ 0
Directors | 4/27/2007
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total grant (in shares) | shares	30,000
Vested (in shares) | shares	30,000
Exercised (in shares) | shares	5,000
Forfeited (in shares) | shares	7,500
Exercisable at December 31 (in shares) | shares	17,500
Remaining unexercised (in shares) | shares	17,500
Exercise price (in usd per share) | $ / shares	$ 54.17
Volatility	0.225
Expected life (years)	8 years
Assumed yield	4.39%
Risk-free rate	4.65%
Total value at grant date	$ 285,000
Expensed in previous years	285,000
Future expense	0
Directors | 4/27/2007 | Expensed in 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated share based compensation	0
Directors | 4/27/2007 | Expensed in 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated share based compensation	0
Directors | 4/27/2007 | Expensed in 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated share based compensation	$ 0
Directors | 4/25/2008
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total grant (in shares) | shares	30,000
Vested (in shares) | shares	30,000
Exercised (in shares) | shares	7,500
Forfeited (in shares) | shares	7,500
Exercisable at December 31 (in shares) | shares	15,000
Remaining unexercised (in shares) | shares	15,000
Exercise price (in usd per share) | $ / shares	$ 50.15
Volatility	0.237
Expected life (years)	7 years
Assumed yield	4.09%
Risk-free rate	3.49%
Total value at grant date	$ 255,000
Expensed in previous years	255,000
Future expense	0
Directors | 4/25/2008 | Expensed in 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated share based compensation	0
Directors | 4/25/2008 | Expensed in 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated share based compensation	0
Directors | 4/25/2008 | Expensed in 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated share based compensation	$ 0
Directors | 4/24/2009
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total grant (in shares) | shares	32,500
Vested (in shares) | shares	32,500
Exercised (in shares) | shares	22,500
Forfeited (in shares) | shares	0
Exercisable at December 31 (in shares) | shares	10,000
Remaining unexercised (in shares) | shares	10,000
Exercise price (in usd per share) | $ / shares	$ 32.68
Volatility	0.344
Expected life (years)	6 years
Assumed yield	4.54%
Risk-free rate	2.19%
Total value at grant date	$ 223,000
Expensed in previous years	223,000
Future expense	0
Directors | 4/24/2009 | Expensed in 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated share based compensation	0
Directors | 4/24/2009 | Expensed in 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated share based compensation	0
Directors | 4/24/2009 | Expensed in 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated share based compensation	$ 0
Directors | 5/7/2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total grant (in shares) | shares	32,500
Vested (in shares) | shares	32,500
Exercised (in shares) | shares	15,000
Forfeited (in shares) | shares	2,500
Exercisable at December 31 (in shares) | shares	15,000
Remaining unexercised (in shares) | shares	15,000
Exercise price (in usd per share) | $ / shares	$ 38.76
Volatility	0.369
Expected life (years)	5 years
Assumed yield	4.23%
Risk-free rate	2.17%
Total value at grant date	$ 288,000
Expensed in previous years	288,000
Future expense	0
Directors | 5/7/2010 | Expensed in 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated share based compensation	0
Directors | 5/7/2010 | Expensed in 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated share based compensation	0
Directors | 5/7/2010 | Expensed in 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated share based compensation	$ 0
Directors | 5/13/2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total grant (in shares) | shares	32,500
Vested (in shares) | shares	32,500
Exercised (in shares) | shares	15,000
Forfeited (in shares) | shares	2,500
Exercisable at December 31 (in shares) | shares	15,000
Remaining unexercised (in shares) | shares	15,000
Exercise price (in usd per share) | $ / shares	$ 41.82
Volatility	0.358
Expected life (years)	5 years
Assumed yield	4.16%
Risk-free rate	1.86%
Total value at grant date	$ 297,000
Expensed in previous years	297,000
Future expense	0
Directors | 5/13/2011 | Expensed in 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated share based compensation	0
Directors | 5/13/2011 | Expensed in 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated share based compensation	0
Directors | 5/13/2011 | Expensed in 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated share based compensation	$ 0
Directors | 5/4/2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total grant (in shares) | shares	35,000
Vested (in shares) | shares	35,000
Exercised (in shares) | shares	15,000
Forfeited (in shares) | shares	0
Exercisable at December 31 (in shares) | shares	20,000
Remaining unexercised (in shares) | shares	20,000
Exercise price (in usd per share) | $ / shares	$ 39.29
Volatility	0.348
Expected life (years)	5 years
Assumed yield	4.61%
Risk-free rate	0.78%
Total value at grant date	$ 257,000
Expensed in previous years	257,000
Future expense	0
Directors | 5/4/2012 | Expensed in 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated share based compensation	0
Directors | 5/4/2012 | Expensed in 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated share based compensation	0
Directors | 5/4/2012 | Expensed in 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated share based compensation	$ 0
Directors | 5/10/2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total grant (in shares) | shares	35,000
Vested (in shares) | shares	35,000
Exercised (in shares) | shares	12,500
Forfeited (in shares) | shares	0
Exercisable at December 31 (in shares) | shares	22,500
Remaining unexercised (in shares) | shares	22,500
Exercise price (in usd per share) | $ / shares	$ 44.42
Volatility	0.333
Expected life (years)	5 years
Assumed yield	4.53%
Risk-free rate	0.82%
Total value at grant date	$ 278,000
Expensed in previous years	0
Future expense	0
Directors | 5/10/2013 | Expensed in 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated share based compensation	278,000
Directors | 5/10/2013 | Expensed in 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated share based compensation	0
Directors | 5/10/2013 | Expensed in 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated share based compensation	$ 0
Directors | 5/9/2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total grant (in shares) | shares	30,000
Vested (in shares) | shares	30,000
Exercised (in shares) | shares	7,500
Forfeited (in shares) | shares	0
Exercisable at December 31 (in shares) | shares	22,500
Remaining unexercised (in shares) | shares	22,500
Exercise price (in usd per share) | $ / shares	$ 47.03
Volatility	0.173
Expected life (years)	5 years
Assumed yield	4.48%
Risk-free rate	1.63%
Total value at grant date	$ 110,000
Expensed in previous years	0
Future expense	0
Directors | 5/9/2014 | Expensed in 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated share based compensation	0
Directors | 5/9/2014 | Expensed in 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated share based compensation	110,000
Directors | 5/9/2014 | Expensed in 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated share based compensation	$ 0
Directors | 5/8/2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total grant (in shares) | shares	35,000
Vested (in shares) | shares	35,000
Exercised (in shares) | shares	5,000
Forfeited (in shares) | shares	0
Exercisable at December 31 (in shares) | shares	30,000
Remaining unexercised (in shares) | shares	30,000
Exercise price (in usd per share) | $ / shares	$ 51.07
Volatility	0.166
Expected life (years)	5 years
Assumed yield	4.54%
Risk-free rate	1.50%
Total value at grant date	$ 125,000
Expensed in previous years	0
Future expense	0
Directors | 5/8/2015 | Expensed in 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated share based compensation	0
Directors | 5/8/2015 | Expensed in 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated share based compensation	0
Directors | 5/8/2015 | Expensed in 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated share based compensation	$ 125,000
Directors | Subtotals
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total grant (in shares) | shares	322,500
Vested (in shares) | shares	322,500
Exercised (in shares) | shares	125,000
Forfeited (in shares) | shares	22,500
Exercisable at December 31 (in shares) | shares	175,000
Remaining unexercised (in shares) | shares	175,000
Total value at grant date	$ 2,262,000
Expensed in previous years	1,749,000
Future expense	0
Directors | Subtotals | Expensed in 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated share based compensation	278,000
Directors | Subtotals | Expensed in 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated share based compensation	110,000
Directors | Subtotals | Expensed in 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated share based compensation	$ 125,000
Officers | 4/27/2007
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total grant (in shares) | shares	135,000
Vested (in shares) | shares	67,500
Exercised (in shares) | shares	14,097
Forfeited (in shares) | shares	67,500
Exercisable at December 31 (in shares) | shares	53,403
Remaining unexercised (in shares) | shares	53,403
Exercise price (in usd per share) | $ / shares	$ 54.17
Volatility	0.233
Expected life (years)	6 years 6 months
Assumed yield	4.13%
Risk-free rate	4.61%
Total value at grant date	$ 1,339,000
Estimated forfeitures	62,000
Expensed in previous years	1,277,000
Future expense	$ 0
Weighted average term of remaining future expense	2 years 7 months 25 days
Officers | 4/27/2007 | Expensed in 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated share based compensation	$ 0
Officers | 4/27/2007 | Expensed in 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated share based compensation	0
Officers | 4/27/2007 | Expensed in 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated share based compensation	$ 0
Officers | 5/13/2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total grant (in shares) | shares	162,500
Vested (in shares) | shares	118,750
Exercised (in shares) | shares	58,754
Forfeited (in shares) | shares	43,750
Exercisable at December 31 (in shares) | shares	59,996
Remaining unexercised (in shares) | shares	59,996
Exercise price (in usd per share) | $ / shares	$ 41.82
Volatility	0.330
Expected life (years)	8 years
Assumed yield	4.81%
Risk-free rate	2.75%
Total value at grant date	$ 1,367,000
Estimated forfeitures	368,000
Expensed in previous years	457,000
Future expense	0
Officers | 5/13/2011 | Expensed in 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated share based compensation	236,000
Officers | 5/13/2011 | Expensed in 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated share based compensation	217,000
Officers | 5/13/2011 | Expensed in 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated share based compensation	$ 89,000
Officers | 5/4/2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total grant (in shares) | shares	242,500
Vested (in shares) | shares	81,875
Exercised (in shares) | shares	40,625
Forfeited (in shares) | shares	135,000
Exercisable at December 31 (in shares) | shares	41,250
Remaining unexercised (in shares) | shares	66,875
Exercise price (in usd per share) | $ / shares	$ 39.29
Volatility	0.315
Expected life (years)	8 years
Assumed yield	5.28%
Risk-free rate	1.49%
Total value at grant date	$ 1,518,000
Estimated forfeitures	890,000
Expensed in previous years	105,000
Future expense	52,000
Officers | 5/4/2012 | Expensed in 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated share based compensation	157,000
Officers | 5/4/2012 | Expensed in 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated share based compensation	157,000
Officers | 5/4/2012 | Expensed in 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated share based compensation	$ 157,000
Officers | 5/10/2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total grant (in shares) | shares	202,500
Vested (in shares) | shares	91,250
Exercised (in shares) | shares	24,375
Forfeited (in shares) | shares	30,000
Exercisable at December 31 (in shares) | shares	66,875
Remaining unexercised (in shares) | shares	148,125
Exercise price (in usd per share) | $ / shares	$ 44.42
Volatility	0.304
Expected life (years)	8 years
Assumed yield	5.12%
Risk-free rate	1.49%
Total value at grant date	$ 1,401,000
Estimated forfeitures	280,000
Expensed in previous years	0
Future expense	359,000
Officers | 5/10/2013 | Expensed in 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated share based compensation	209,000
Officers | 5/10/2013 | Expensed in 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated share based compensation	284,000
Officers | 5/10/2013 | Expensed in 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated share based compensation	$ 269,000
Officers | 5/9/2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total grant (in shares) | shares	170,000
Vested (in shares) | shares	42,500
Exercised (in shares) | shares	3,125
Forfeited (in shares) | shares	0
Exercisable at December 31 (in shares) | shares	39,375
Remaining unexercised (in shares) | shares	166,875
Exercise price (in usd per share) | $ / shares	$ 47.03
Volatility	0.306
Expected life (years)	7 years
Assumed yield	4.89%
Risk-free rate	2.17%
Total value at grant date	$ 1,350,000
Estimated forfeitures	169,000
Expensed in previous years	0
Future expense	689,000
Officers | 5/9/2014 | Expensed in 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated share based compensation	0
Officers | 5/9/2014 | Expensed in 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated share based compensation	197,000
Officers | 5/9/2014 | Expensed in 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated share based compensation	$ 295,000
Officers | 5/8/2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total grant (in shares) | shares	190,000
Vested (in shares) | shares	0
Exercised (in shares) | shares	0
Forfeited (in shares) | shares	0
Exercisable at December 31 (in shares) | shares	0
Remaining unexercised (in shares) | shares	190,000
Exercise price (in usd per share) | $ / shares	$ 51.07
Volatility	0.298
Expected life (years)	7 years
Assumed yield	4.94%
Risk-free rate	1.89%
Total value at grant date	$ 1,585,000
Estimated forfeitures	142,000
Expensed in previous years	0
Future expense	1,202,000
Officers | 5/8/2015 | Expensed in 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated share based compensation	0
Officers | 5/8/2015 | Expensed in 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated share based compensation	0
Officers | 5/8/2015 | Expensed in 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated share based compensation	$ 241,000
Officers | Subtotals
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total grant (in shares) | shares	1,102,500
Vested (in shares) | shares	401,875
Exercised (in shares) | shares	140,976
Forfeited (in shares) | shares	276,250
Exercisable at December 31 (in shares) | shares	260,899
Remaining unexercised (in shares) | shares	685,274
Total value at grant date	$ 8,560,000
Estimated forfeitures	1,911,000
Expensed in previous years	1,839,000
Future expense	2,302,000
Officers | Subtotals | Expensed in 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated share based compensation	602,000
Officers | Subtotals | Expensed in 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated share based compensation	855,000
Officers | Subtotals | Expensed in 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Allocated share based compensation	$ 1,051,000

Stock Option Plan - Summary of

Stock Option Plan - Summary of Option Activity (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Shares
Outstanding at January 1 (in shares)	748,208	753,625	570,840
Granted (in shares)	225,000	200,000	237,500
Exercised (in shares)	(112,934)	(167,917)	(49,715)
Expired/Forfeited (in shares)	0	(37,500)	(5,000)
Outstanding December 31 (in shares)	860,274	748,208	753,625
Options exercisable (in shares)	435,899	380,708	413,000
Weighted Average Exercise Price
Outstanding at January 1 (in usd per share)	$ 44.79	$ 42.55	$ 41.04
Granted (in usd per share)	51.07	47.03	44.42
Exercised (in usd per share)	43.67	37.71	33.15
Expired/Forfeited (in usd per share)	0	43.56	52.16
Outstanding December 31 (in usd per share)	$ 46.58	44.79	42.55
Exercisable at December 31 (in usd per share)		$ 44.85	$ 42.42
Intrinsic value of options exercised	$ 1,500,000	$ 2,000,000	$ 600,000
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Intrinsic value of options outstanding	$ 4,200,000
Options exercisable (in shares)	435,899	380,708	413,000
Intrinsic value of options exercisable	$ 2,800,000
Closing price (in usd per share)	$ 51.27
Weighted average remaining life of options exercisable	5 years 8 months 3 days
Weighted average remaining life of options outstanding	7 years 22 days
Options Issued in 2007
Shares
Options exercisable (in shares)	70,903
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Intrinsic value of options outstanding	$ 0
Options exercisable (in shares)	70,903

Fair Value of Financial Instr62

Fair Value of Financial Instruments - Additional Information (Detail) $ in Millions	Dec. 31, 2015USD ($)	Dec. 31, 2014USD ($)	Jun. 30, 2011instrument
Fair Value of Financial Instruments [Line Items]
Interest rate	3.75%	3.65%
Notes payable, fair value	$ 832.4	$ 886.4
Notes payable, carrying value	892.9	$ 784.8
Interest Rate Swap
Fair Value of Financial Instruments [Line Items]
Fair value of derivative liability	$ 2.9
Cash Flow Hedging | Designated as Hedging Instrument | Interest Rate Swap
Fair Value of Financial Instruments [Line Items]
Derivative, number of instruments held | instrument			1

Fair Value of Financial Instr63

Fair Value of Financial Instruments - Changes in Fair Value of Swaps (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Increase (decrease) in fair value:
Recognized in earnings	$ (10)	$ (10)	$ (7)
Recognized in other comprehensive income	124	(675)	2,897
Total	$ 114	$ (685)	$ 2,890

Distributions - Additional Info

Distributions - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	Jan. 29, 2016	Jan. 15, 2016	Jan. 07, 2016	Dec. 31, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Dividends [Line Items]
Common stock issued, discount rate					3.00%
Common stock distributions (in usd per share)					$ 1.69	$ 1.56	$ 1.44
Dividends declared per common share outstanding (in usd per share)				$ 0.43
Distribution to limited partnership unitholders					$ 12,228	$ 11,117	$ 9,956
Dividend Income
Dividends [Line Items]
Common stock distributions (in usd per share)					$ 1.69	$ 1.56	$ 0.96
Return on Invested Capital
Dividends [Line Items]
Common stock distributions (in usd per share)							0.48
Series A Preferred Stock
Dividends [Line Items]
Preferred stock dividend (in usd per share)						2.41	2
Series B Preferred Stock
Dividends [Line Items]
Preferred stock dividend (in usd per share)							0.99
Series C Preferred Stock
Dividends [Line Items]
Preferred stock dividend (in usd per share)					$ 1.72	$ 1.72	$ 1.09
Subsequent Event
Dividends [Line Items]
Common stock dividend paid	$ 9,100
Distribution to limited partnership unitholders	$ 3,100
Distribution to limited partnership unitholders (in usd per share)	$ 0.43
Subsequent Event | Series C Preferred Stock
Dividends [Line Items]
Dividends declared per preferred share outstanding (in usd per share)			$ 0.4297
Preferred stock distributions		$ 3,100

Distributions - Summary of Dist

Distributions - Summary of Distributions Paid Including Activity in Plan as well as Limited Partnership Units Issued from Reinvestment of Unit Distributions (Detail) - USD ($) $ / shares in Units, $ in Thousands	Oct. 31, 2015	Jul. 31, 2015	Apr. 30, 2015	Jan. 31, 2015	Oct. 31, 2014	Jul. 31, 2014	Apr. 30, 2014	Jan. 31, 2014	Oct. 31, 2013	Apr. 30, 2013	Jan. 31, 2013	Jul. 31, 2013	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Dividends [Line Items]
Preferred Stockholders													$ 12,375	$ 13,474	$ 14,561
Common Stockholders													35,645	32,346	29,205
Limited Partnership Unitholders													$ 12,228	$ 11,117	$ 9,956
Dividend Reinvestments, Common Stock Issued (in shares)													201,212	197,638	475,162
Dividend Reinvestments, Limited Partnership Units Issued (in shares)													107,037	196,183	88,309
October 31
Dividends [Line Items]
Preferred Stockholders	$ 3,094				$ 3,856				$ 3,206
Common Stockholders	9,106				8,348				7,388
Limited Partnership Unitholders	$ 3,129				$ 2,879				$ 2,489
Dividend Reinvestments, Common Stock Issued (in shares)	47,313				40,142				48,836
Dividend Reinvestments, Discounted Share Price (in usd per share)	$ 55.73				$ 52.71				$ 46.27
Dividend Reinvestments, Limited Partnership Units Issued (in shares)	28,936								88,309
Dividend Reinvestments, Average Unit Price (in usd per share)	$ 55.73								$ 46.93
July 31
Dividends [Line Items]
Preferred Stockholders		$ 3,094				$ 3,206						$ 3,206
Common Stockholders		9,081				8,314						7,327
Limited Partnership Unitholders		$ 3,115				$ 2,879						$ 2,489
Dividend Reinvestments, Common Stock Issued (in shares)		56,003				57,696						138,019
Dividend Reinvestments, Discounted Share Price (in usd per share)		$ 50.30				$ 46.79						$ 45.21
Dividend Reinvestments, Limited Partnership Units Issued (in shares)		32,041
Dividend Reinvestments, Average Unit Price (in usd per share)		$ 50.30
April 30
Dividends [Line Items]
Preferred Stockholders			$ 3,094				$ 3,206			$ 4,364
Common Stockholders			9,055				8,269			7,272
Limited Partnership Unitholders			$ 3,104				$ 2,838			$ 2,489
Dividend Reinvestments, Common Stock Issued (in shares)			54,921				60,212			142,839
Dividend Reinvestments, Discounted Share Price (in usd per share)			$ 50.21				$ 44.14			$ 42.85
Dividend Reinvestments, Limited Partnership Units Issued (in shares)			25,264				104,831
Dividend Reinvestments, Average Unit Price (in usd per share)			$ 50.21				$ 44.77
January 31
Dividends [Line Items]
Preferred Stockholders				$ 3,093				$ 3,206			$ 3,785
Common Stockholders				8,403				7,415			7,218
Limited Partnership Unitholders				$ 2,880				$ 2,521			$ 2,489
Dividend Reinvestments, Common Stock Issued (in shares)				42,975				39,588			145,468
Dividend Reinvestments, Discounted Share Price (in usd per share)				$ 56.74				$ 45.15			$ 41.67
Dividend Reinvestments, Limited Partnership Units Issued (in shares)				20,796				91,352
Dividend Reinvestments, Average Unit Price (in usd per share)								$ 45.80					$ 56.74

Interim Results (Unaudited) - S

Interim Results (Unaudited) - Summary of Results of Operations for Quarterly Periods (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Quarterly Financial Information Disclosure [Abstract]
Revenue	$ 52,902	$ 52,376	$ 51,711	$ 52,088	$ 51,264	$ 50,595	$ 52,286	$ 52,947	$ 209,077	$ 207,092	$ 197,897
Operating income before loss on early extinguishment of debt, gain on casualty settlement, and noncontrolling interests	14,083	13,238	12,922	12,687	12,314	12,479	14,423	12,713	52,930	51,929	35,269
Gains on sales of properties	0	0	11	0	0	0	6,069	0	11	6,069	0
Net income attributable to Saul Centers, Inc.	11,250	10,615	10,396	10,207	10,496	10,106	16,054	10,287	42,468	46,943	30,872
Net income available to common stockholders	$ 8,156	$ 7,522	$ 7,302	$ 7,113	$ 5,274	$ 6,900	$ 12,847	$ 7,081	$ 30,093	$ 32,102	$ 11,661
Net income available to common stockholders per diluted share (in dollars per share)	$ 0.38	$ 0.36	$ 0.35	$ 0.33	$ 0.25	$ 0.33	$ 0.62	$ 0.34	$ 1.42	$ 1.54	$ 0.57

Business Segments - Additional

Business Segments - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2015segment
Segment Reporting [Abstract]
Number of reportable business segments	2

Business Segments (Detail)

Business Segments (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Segment Reporting Information [Line Items]
Revenue	$ 52,902	$ 52,376	$ 51,711	$ 52,088	$ 51,264	$ 50,595	$ 52,286	$ 52,947	$ 209,077	$ 207,092	$ 197,897
Expenses									(51,143)	(49,513)	(47,942)
Income from real estate									157,934	157,579	149,955
Interest expense and amortization of deferred debt costs									(45,165)	(46,034)	(46,589)
General and administrative									(16,353)	(16,961)	(14,951)
Subtotal									96,416	94,584	88,415
Depreciation and amortization of deferred leasing costs									(43,270)	(41,203)	(49,130)
Acquisition related costs									(84)	(949)	(106)
Predevelopment expenses									(132)	(503)	(3,910)
Loss on early extinguishment of debt									0	0	(497)
Gain on casualty settlement									0	0	77
Change in fair value of derivatives									(10)	(10)	(7)
Gain on sale of property	0	$ 0	$ 11	$ 0	0	$ 0	$ 6,069	$ 0	11	6,069	0
Net Income (loss)									52,931	57,988	34,842
Capital investment									69,619	90,268	26,439
Total assets	1,304,145				1,266,987				1,304,145	1,266,987	1,198,675
Shopping Centers
Segment Reporting Information [Line Items]
Revenue									156,110	154,385	145,219
Expenses									(33,877)	(33,781)	(30,729)
Income from real estate									122,233	120,604	114,490
Interest expense and amortization of deferred debt costs									0	0	0
General and administrative									0	0	0
Subtotal									122,233	120,604	114,490
Depreciation and amortization of deferred leasing costs									(30,171)	(28,082)	(27,340)
Acquisition related costs									(84)	(949)	(106)
Predevelopment expenses									(57)	0	0
Loss on early extinguishment of debt											0
Gain on casualty settlement											77
Change in fair value of derivatives									0	0	0
Gain on sale of property									11	6,069
Net Income (loss)									91,932	97,642	87,121
Capital investment									17,159	66,508	18,232
Total assets	936,542				946,819				936,542	946,819	888,109
Mixed-Use Properties
Segment Reporting Information [Line Items]
Revenue									52,916	52,632	52,609
Expenses									(17,266)	(15,732)	(17,213)
Income from real estate									35,650	36,900	35,396
Interest expense and amortization of deferred debt costs									0	0	0
General and administrative									0	0	0
Subtotal									35,650	36,900	35,396
Depreciation and amortization of deferred leasing costs									(13,099)	(13,121)	(21,790)
Acquisition related costs									0	0	0
Predevelopment expenses									(75)	(503)	(3,910)
Loss on early extinguishment of debt											0
Gain on casualty settlement											0
Change in fair value of derivatives									0	0	0
Gain on sale of property									0	0
Net Income (loss)									22,476	23,276	9,696
Capital investment									52,460	23,760	8,207
Total assets	356,400				307,901				356,400	307,901	293,512
Corporate and Other
Segment Reporting Information [Line Items]
Revenue									51	75	69
Expenses									0	0	0
Income from real estate									51	75	69
Interest expense and amortization of deferred debt costs									(45,165)	(46,034)	(46,589)
General and administrative									(16,353)	(16,961)	(14,951)
Subtotal									(61,467)	(62,920)	(61,471)
Depreciation and amortization of deferred leasing costs									0	0	0
Acquisition related costs									0	0	0
Predevelopment expenses									0	0	0
Loss on early extinguishment of debt											(497)
Gain on casualty settlement											0
Change in fair value of derivatives									(10)	(10)	(7)
Gain on sale of property									0	0
Net Income (loss)									(61,477)	(62,930)	(61,975)
Capital investment									0	0	0
Total assets	$ 11,203				$ 12,267				$ 11,203	$ 12,267	$ 17,054

Real Estate and Accumulated D69

Real Estate and Accumulated Depreciation (Detail) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Real Estate Properties [Line Items]
Initial Basis		$ 818,317
Cost Capitalized Subsequent to Acquisition		804,393
Basis at Close of Period, Land		427,267
Basis at Close of Period, Building and Improvements		1,193,622
Basis at Close of Period, Leasehold Interests		1,821
Total		1,622,710	$ 1,560,159	$ 1,459,439	$ 1,466,068
Accumulated Depreciation		425,370	396,617	$ 364,663	$ 353,305
Book Value		1,197,340	1,163,542
Related Debt		802,034	808,997
Development Land, Related Debt		45,208	$ 5,391
Total, Related Debt		847,242
Shopping Centers
Real Estate Properties [Line Items]
Initial Basis		766,970
Cost Capitalized Subsequent to Acquisition		393,939
Basis at Close of Period, Land		389,369
Basis at Close of Period, Building and Improvements		769,719
Basis at Close of Period, Leasehold Interests		1,821
Total		1,160,909
Accumulated Depreciation		295,522
Book Value		865,387
Related Debt		629,243
Shopping Centers | Ashburn Village, Ashburn, VA
Real Estate Properties [Line Items]
Initial Basis		11,431
Cost Capitalized Subsequent to Acquisition		19,713
Basis at Close of Period, Land		6,764
Basis at Close of Period, Building and Improvements		24,380
Basis at Close of Period, Leasehold Interests		0
Total		31,144
Accumulated Depreciation		11,578
Book Value		19,566
Related Debt		$ 29,564
Buildings and Improvements Depreciable Lives in Years		40 years
Shopping Centers | Ashland Square Phase I, Dumfries, VA
Real Estate Properties [Line Items]
Initial Basis		$ 1,178
Cost Capitalized Subsequent to Acquisition		7,503
Basis at Close of Period, Land		1,178
Basis at Close of Period, Building and Improvements		7,503
Basis at Close of Period, Leasehold Interests		0
Total		8,681
Accumulated Depreciation		1,108
Book Value		7,573
Related Debt		$ 0
Shopping Centers | Ashland Square Phase I, Dumfries, VA | Minimum
Real Estate Properties [Line Items]
Buildings and Improvements Depreciable Lives in Years		20 years
Shopping Centers | Ashland Square Phase I, Dumfries, VA | Maximum
Real Estate Properties [Line Items]
Buildings and Improvements Depreciable Lives in Years		50 years
Shopping Centers | Beacon Center, Alexandria, VA
Real Estate Properties [Line Items]
Initial Basis		$ 1,493
Cost Capitalized Subsequent to Acquisition		18,172
Basis at Close of Period, Land		0
Basis at Close of Period, Building and Improvements		18,571
Basis at Close of Period, Leasehold Interests		1,094
Total		19,665
Accumulated Depreciation		13,156
Book Value		6,509
Related Debt		$ 31,844
Shopping Centers | Beacon Center, Alexandria, VA | Minimum
Real Estate Properties [Line Items]
Buildings and Improvements Depreciable Lives in Years		40 years
Shopping Centers | Beacon Center, Alexandria, VA | Maximum
Real Estate Properties [Line Items]
Buildings and Improvements Depreciable Lives in Years		50 years
Shopping Centers | BJ’s Wholesale Club, Alexandria, VA
Real Estate Properties [Line Items]
Initial Basis		$ 22,623
Cost Capitalized Subsequent to Acquisition		0
Basis at Close of Period, Land		22,623
Basis at Close of Period, Building and Improvements		0
Basis at Close of Period, Leasehold Interests		0
Total		22,623
Accumulated Depreciation		0
Book Value		22,623
Related Debt		$ 11,365
Buildings and Improvements Depreciable Lives in Years		0 years
Shopping Centers | Boca Valley Plaza, Boca Raton, FL
Real Estate Properties [Line Items]
Initial Basis		$ 16,720
Cost Capitalized Subsequent to Acquisition		1,434
Basis at Close of Period, Land		5,735
Basis at Close of Period, Building and Improvements		12,419
Basis at Close of Period, Leasehold Interests		0
Total		18,154
Accumulated Depreciation		3,877
Book Value		14,277
Related Debt		$ 10,587
Buildings and Improvements Depreciable Lives in Years		40 years
Shopping Centers | Boulevard, Fairfax, VA
Real Estate Properties [Line Items]
Initial Basis		$ 4,883
Cost Capitalized Subsequent to Acquisition		4,461
Basis at Close of Period, Land		3,687
Basis at Close of Period, Building and Improvements		5,657
Basis at Close of Period, Leasehold Interests		0
Total		9,344
Accumulated Depreciation		2,379
Book Value		6,965
Related Debt		$ 17,666
Buildings and Improvements Depreciable Lives in Years		40 years
Shopping Centers | Briggs Chaney MarketPlace, Silver Spring, MD
Real Estate Properties [Line Items]
Initial Basis		$ 27,037
Cost Capitalized Subsequent to Acquisition		3,497
Basis at Close of Period, Land		9,789
Basis at Close of Period, Building and Improvements		20,745
Basis at Close of Period, Leasehold Interests		0
Total		30,534
Accumulated Depreciation		6,684
Book Value		23,850
Related Debt		$ 15,064
Buildings and Improvements Depreciable Lives in Years		40 years
Shopping Centers | Broadlands Village, Ashburn, VA
Real Estate Properties [Line Items]
Initial Basis		$ 5,316
Cost Capitalized Subsequent to Acquisition		26,745
Basis at Close of Period, Land		5,300
Basis at Close of Period, Building and Improvements		26,761
Basis at Close of Period, Leasehold Interests		0
Total		32,061
Accumulated Depreciation		9,101
Book Value		22,960
Related Debt		$ 17,964
Shopping Centers | Broadlands Village, Ashburn, VA | Minimum
Real Estate Properties [Line Items]
Buildings and Improvements Depreciable Lives in Years		40 years
Shopping Centers | Broadlands Village, Ashburn, VA | Maximum
Real Estate Properties [Line Items]
Buildings and Improvements Depreciable Lives in Years		50 years
Shopping Centers | Countryside Marketplace, Sterling, VA
Real Estate Properties [Line Items]
Initial Basis		$ 28,912
Cost Capitalized Subsequent to Acquisition		3,286
Basis at Close of Period, Land		7,666
Basis at Close of Period, Building and Improvements		24,532
Basis at Close of Period, Leasehold Interests		0
Total		32,198
Accumulated Depreciation		7,278
Book Value		24,920
Related Debt		$ 15,098
Buildings and Improvements Depreciable Lives in Years		40 years
Shopping Centers | Cranberry Square, Westminster, MD
Real Estate Properties [Line Items]
Initial Basis		$ 31,578
Cost Capitalized Subsequent to Acquisition		512
Basis at Close of Period, Land		6,700
Basis at Close of Period, Building and Improvements		25,390
Basis at Close of Period, Leasehold Interests		0
Total		32,090
Accumulated Depreciation		2,736
Book Value		29,354
Related Debt		$ 18,150
Buildings and Improvements Depreciable Lives in Years		40 years
Shopping Centers | Cruse MarketPlace, Cumming, GA
Real Estate Properties [Line Items]
Initial Basis		$ 12,226
Cost Capitalized Subsequent to Acquisition		239
Basis at Close of Period, Land		3,901
Basis at Close of Period, Building and Improvements		8,564
Basis at Close of Period, Leasehold Interests		0
Total		12,465
Accumulated Depreciation		2,531
Book Value		9,934
Related Debt		$ 0
Buildings and Improvements Depreciable Lives in Years		40 years
Shopping Centers | Flagship Center, Rockville, MD
Real Estate Properties [Line Items]
Initial Basis		$ 160
Cost Capitalized Subsequent to Acquisition		9
Basis at Close of Period, Land		169
Basis at Close of Period, Building and Improvements		0
Basis at Close of Period, Leasehold Interests		0
Total		169
Accumulated Depreciation		0
Book Value		169
Related Debt		$ 0
Buildings and Improvements Depreciable Lives in Years		0 years
Shopping Centers | French Market, Oklahoma City, OK
Real Estate Properties [Line Items]
Initial Basis		$ 5,781
Cost Capitalized Subsequent to Acquisition		13,858
Basis at Close of Period, Land		1,118
Basis at Close of Period, Building and Improvements		18,521
Basis at Close of Period, Leasehold Interests		0
Total		19,639
Accumulated Depreciation		10,080
Book Value		9,559
Related Debt		$ 0
Buildings and Improvements Depreciable Lives in Years		50 years
Shopping Centers | Germantown, Germantown, MD
Real Estate Properties [Line Items]
Initial Basis		$ 3,576
Cost Capitalized Subsequent to Acquisition		990
Basis at Close of Period, Land		2,034
Basis at Close of Period, Building and Improvements		2,532
Basis at Close of Period, Leasehold Interests		0
Total		4,566
Accumulated Depreciation		2,154
Book Value		2,412
Related Debt		$ 0
Buildings and Improvements Depreciable Lives in Years		40 years
Shopping Centers | 750/730/726 N. Glebe Road, Arlington, VA
Real Estate Properties [Line Items]
Initial Basis		$ 46,312
Cost Capitalized Subsequent to Acquisition		1,994
Basis at Close of Period, Land		44,831
Basis at Close of Period, Building and Improvements		3,475
Basis at Close of Period, Leasehold Interests		0
Total		48,306
Accumulated Depreciation		697
Book Value		47,609
Related Debt		$ 0
Shopping Centers | 750/730/726 N. Glebe Road, Arlington, VA | Minimum
Real Estate Properties [Line Items]
Buildings and Improvements Depreciable Lives in Years		2 years
Shopping Centers | 750/730/726 N. Glebe Road, Arlington, VA | Maximum
Real Estate Properties [Line Items]
Buildings and Improvements Depreciable Lives in Years		3 years
Shopping Centers | The Glen, Woodbridge, VA
Real Estate Properties [Line Items]
Initial Basis		$ 12,918
Cost Capitalized Subsequent to Acquisition		7,734
Basis at Close of Period, Land		5,300
Basis at Close of Period, Building and Improvements		15,352
Basis at Close of Period, Leasehold Interests		0
Total		20,652
Accumulated Depreciation		7,899
Book Value		12,753
Related Debt		$ 8,622
Buildings and Improvements Depreciable Lives in Years		40 years
Shopping Centers | Great Eastern, District Heights, MD
Real Estate Properties [Line Items]
Initial Basis		$ 4,993
Cost Capitalized Subsequent to Acquisition		10,678
Basis at Close of Period, Land		3,785
Basis at Close of Period, Building and Improvements		11,886
Basis at Close of Period, Leasehold Interests		0
Total		15,671
Accumulated Depreciation		8,023
Book Value		7,648
Related Debt		$ 0
Buildings and Improvements Depreciable Lives in Years		40 years
Shopping Centers | Great Falls Center, Great Falls, VA
Real Estate Properties [Line Items]
Initial Basis		$ 41,750
Cost Capitalized Subsequent to Acquisition		2,986
Basis at Close of Period, Land		14,766
Basis at Close of Period, Building and Improvements		29,970
Basis at Close of Period, Leasehold Interests		0
Total		44,736
Accumulated Depreciation		5,876
Book Value		38,860
Related Debt		$ 14,177
Buildings and Improvements Depreciable Lives in Years		40 years
Shopping Centers | Hampshire Langley, Takoma, MD
Real Estate Properties [Line Items]
Initial Basis		$ 3,159
Cost Capitalized Subsequent to Acquisition		3,350
Basis at Close of Period, Land		1,856
Basis at Close of Period, Building and Improvements		4,653
Basis at Close of Period, Leasehold Interests		0
Total		6,509
Accumulated Depreciation		3,484
Book Value		3,025
Related Debt		$ 16,826
Buildings and Improvements Depreciable Lives in Years		40 years
Shopping Centers | Hunt Club Corners, Apopka, FL
Real Estate Properties [Line Items]
Initial Basis		$ 12,584
Cost Capitalized Subsequent to Acquisition		3,165
Basis at Close of Period, Land		4,822
Basis at Close of Period, Building and Improvements		10,927
Basis at Close of Period, Leasehold Interests		0
Total		15,749
Accumulated Depreciation		2,931
Book Value		12,818
Related Debt		$ 5,959
Buildings and Improvements Depreciable Lives in Years		40 years
Shopping Centers | Jamestown Place, Altamonte Springs, FL
Real Estate Properties [Line Items]
Initial Basis		$ 14,055
Cost Capitalized Subsequent to Acquisition		1,161
Basis at Close of Period, Land		4,455
Basis at Close of Period, Building and Improvements		10,761
Basis at Close of Period, Leasehold Interests		0
Total		15,216
Accumulated Depreciation		2,829
Book Value		12,387
Related Debt		$ 8,025
Buildings and Improvements Depreciable Lives in Years		40 years
Shopping Centers | Kentlands Square I, Gaithersburg, MD
Real Estate Properties [Line Items]
Initial Basis		$ 14,379
Cost Capitalized Subsequent to Acquisition		328
Basis at Close of Period, Land		5,006
Basis at Close of Period, Building and Improvements		9,701
Basis at Close of Period, Leasehold Interests		0
Total		14,707
Accumulated Depreciation		3,206
Book Value		11,501
Related Debt		$ 7,180
Buildings and Improvements Depreciable Lives in Years		40 years
Shopping Centers | Kentlands Square II, Gaithersburg, MD
Real Estate Properties [Line Items]
Initial Basis		$ 76,723
Cost Capitalized Subsequent to Acquisition		1,188
Basis at Close of Period, Land		22,800
Basis at Close of Period, Building and Improvements		55,111
Basis at Close of Period, Leasehold Interests		0
Total		77,911
Accumulated Depreciation		5,925
Book Value		71,986
Related Debt		$ 38,842
Buildings and Improvements Depreciable Lives in Years		40 years
Shopping Centers | Kentlands Place, Gaithersburg, MD
Real Estate Properties [Line Items]
Initial Basis		$ 1,425
Cost Capitalized Subsequent to Acquisition		7,202
Basis at Close of Period, Land		1,425
Basis at Close of Period, Building and Improvements		7,202
Basis at Close of Period, Leasehold Interests		0
Total		8,627
Accumulated Depreciation		3,176
Book Value		5,451
Related Debt		$ 0
Buildings and Improvements Depreciable Lives in Years		50 years
Shopping Centers | Lansdowne Town Center, Leesburg, VA
Real Estate Properties [Line Items]
Initial Basis		$ 6,545
Cost Capitalized Subsequent to Acquisition		36,364
Basis at Close of Period, Land		6,546
Basis at Close of Period, Building and Improvements		36,363
Basis at Close of Period, Leasehold Interests		0
Total		42,909
Accumulated Depreciation		11,352
Book Value		31,557
Related Debt		$ 34,420
Buildings and Improvements Depreciable Lives in Years		50 years
Shopping Centers | Leesburg Pike Plaza, Baileys Crossroads, VA
Real Estate Properties [Line Items]
Initial Basis		$ 2,418
Cost Capitalized Subsequent to Acquisition		6,173
Basis at Close of Period, Land		1,132
Basis at Close of Period, Building and Improvements		7,459
Basis at Close of Period, Leasehold Interests		0
Total		8,591
Accumulated Depreciation		5,700
Book Value		2,891
Related Debt		$ 16,348
Buildings and Improvements Depreciable Lives in Years		40 years
Shopping Centers | Lumberton Plaza, Lumberton, NJ
Real Estate Properties [Line Items]
Initial Basis		$ 4,400
Cost Capitalized Subsequent to Acquisition		11,170
Basis at Close of Period, Land		950
Basis at Close of Period, Building and Improvements		14,620
Basis at Close of Period, Leasehold Interests		0
Total		15,570
Accumulated Depreciation		12,109
Book Value		3,461
Related Debt		$ 0
Buildings and Improvements Depreciable Lives in Years		40 years
Shopping Centers | Metro Pike Center, Rockville, MD
Real Estate Properties [Line Items]
Initial Basis		$ 33,123
Cost Capitalized Subsequent to Acquisition		3,090
Basis at Close of Period, Land		26,064
Basis at Close of Period, Building and Improvements		10,149
Basis at Close of Period, Leasehold Interests		0
Total		36,213
Accumulated Depreciation		973
Book Value		35,240
Related Debt		$ 14,801
Buildings and Improvements Depreciable Lives in Years		40 years
Shopping Centers | Shops at Monocacy, Frederick, MD
Real Estate Properties [Line Items]
Initial Basis		$ 9,541
Cost Capitalized Subsequent to Acquisition		13,926
Basis at Close of Period, Land		9,260
Basis at Close of Period, Building and Improvements		14,207
Basis at Close of Period, Leasehold Interests		0
Total		23,467
Accumulated Depreciation		4,635
Book Value		18,832
Related Debt		$ 13,387
Buildings and Improvements Depreciable Lives in Years		50 years
Shopping Centers | Northrock, Warrenton, VA
Real Estate Properties [Line Items]
Initial Basis		$ 12,686
Cost Capitalized Subsequent to Acquisition		15,167
Basis at Close of Period, Land		12,686
Basis at Close of Period, Building and Improvements		15,167
Basis at Close of Period, Leasehold Interests		0
Total		27,853
Accumulated Depreciation		2,813
Book Value		25,040
Related Debt		$ 15,748
Buildings and Improvements Depreciable Lives in Years		50 years
Shopping Centers | Olde Forte Village, Ft. Washington, MD
Real Estate Properties [Line Items]
Initial Basis		$ 15,933
Cost Capitalized Subsequent to Acquisition		6,514
Basis at Close of Period, Land		5,409
Basis at Close of Period, Building and Improvements		17,038
Basis at Close of Period, Leasehold Interests		0
Total		22,447
Accumulated Depreciation		6,112
Book Value		16,335
Related Debt		$ 10,928
Buildings and Improvements Depreciable Lives in Years		40 years
Shopping Centers | Olney, Olney, MD
Real Estate Properties [Line Items]
Initial Basis		$ 1,884
Cost Capitalized Subsequent to Acquisition		1,706
Basis at Close of Period, Land		0
Basis at Close of Period, Building and Improvements		3,590
Basis at Close of Period, Leasehold Interests		0
Total		3,590
Accumulated Depreciation		3,275
Book Value		315
Related Debt		$ 11,282
Buildings and Improvements Depreciable Lives in Years		40 years
Shopping Centers | Orchard Park, Dunwoody, GA
Real Estate Properties [Line Items]
Initial Basis		$ 19,377
Cost Capitalized Subsequent to Acquisition		814
Basis at Close of Period, Land		7,751
Basis at Close of Period, Building and Improvements		12,440
Basis at Close of Period, Leasehold Interests		0
Total		20,191
Accumulated Depreciation		2,703
Book Value		17,488
Related Debt		$ 10,492
Buildings and Improvements Depreciable Lives in Years		40 years
Shopping Centers | Palm Springs Center, Altamonte Springs, FL
Real Estate Properties [Line Items]
Initial Basis		$ 18,365
Cost Capitalized Subsequent to Acquisition		1,375
Basis at Close of Period, Land		5,739
Basis at Close of Period, Building and Improvements		14,001
Basis at Close of Period, Leasehold Interests		0
Total		19,740
Accumulated Depreciation		3,648
Book Value		16,092
Related Debt		$ 9,127
Buildings and Improvements Depreciable Lives in Years		40 years
Shopping Centers | Ravenwood, Baltimore, MD
Real Estate Properties [Line Items]
Initial Basis		$ 1,245
Cost Capitalized Subsequent to Acquisition		4,097
Basis at Close of Period, Land		703
Basis at Close of Period, Building and Improvements		4,639
Basis at Close of Period, Leasehold Interests		0
Total		5,342
Accumulated Depreciation		2,771
Book Value		2,571
Related Debt		$ 15,360
Buildings and Improvements Depreciable Lives in Years		40 years
Shopping Centers | 11503 Rockville Pike/5541 Nicholson Lane, Rockville, MD
Real Estate Properties [Line Items]
Initial Basis		$ 26,561
Cost Capitalized Subsequent to Acquisition		0
Basis at Close of Period, Land		22,113
Basis at Close of Period, Building and Improvements		4,448
Basis at Close of Period, Leasehold Interests		0
Total		26,561
Accumulated Depreciation		584
Book Value		25,977
Related Debt		$ 0
Buildings and Improvements Depreciable Lives in Years		40 years
Shopping Centers | 1500/1580/1582/1584 Rockville Pike, Rockville, MD
Real Estate Properties [Line Items]
Initial Basis		$ 51,149
Cost Capitalized Subsequent to Acquisition		906
Basis at Close of Period, Land		43,863
Basis at Close of Period, Building and Improvements		8,192
Basis at Close of Period, Leasehold Interests		0
Total		52,055
Accumulated Depreciation		3,281
Book Value		48,774
Related Debt		0
Shopping Centers | Seabreeze Plaza, Palm Harbor, FL
Real Estate Properties [Line Items]
Initial Basis		24,526
Cost Capitalized Subsequent to Acquisition		1,525
Basis at Close of Period, Land		8,665
Basis at Close of Period, Building and Improvements		17,386
Basis at Close of Period, Leasehold Interests		0
Total		26,051
Accumulated Depreciation		4,566
Book Value		21,485
Related Debt		$ 17,011
Buildings and Improvements Depreciable Lives in Years		40 years
Shopping Centers | Market Place at Sea Colony, Bethany Beach, DE
Real Estate Properties [Line Items]
Initial Basis		$ 2,920
Cost Capitalized Subsequent to Acquisition		106
Basis at Close of Period, Land		1,147
Basis at Close of Period, Building and Improvements		1,879
Basis at Close of Period, Leasehold Interests		0
Total		3,026
Accumulated Depreciation		373
Book Value		2,653
Related Debt		$ 0
Buildings and Improvements Depreciable Lives in Years		40 years
Shopping Centers | Seven Corners, Falls Church, VA
Real Estate Properties [Line Items]
Initial Basis		$ 4,848
Cost Capitalized Subsequent to Acquisition		43,692
Basis at Close of Period, Land		4,913
Basis at Close of Period, Building and Improvements		43,627
Basis at Close of Period, Leasehold Interests		0
Total		48,540
Accumulated Depreciation		26,614
Book Value		21,926
Related Debt		$ 67,850
Buildings and Improvements Depreciable Lives in Years		40 years
Shopping Centers | Severna Park Marketplace, Severna Park, MD
Real Estate Properties [Line Items]
Initial Basis		$ 63,254
Cost Capitalized Subsequent to Acquisition		86
Basis at Close of Period, Land		12,700
Basis at Close of Period, Building and Improvements		50,640
Basis at Close of Period, Leasehold Interests		0
Total		63,340
Accumulated Depreciation		5,381
Book Value		57,959
Related Debt		$ 34,133
Buildings and Improvements Depreciable Lives in Years		40 years
Shopping Centers | Shops at Fairfax, Fairfax, VA
Real Estate Properties [Line Items]
Initial Basis		$ 2,708
Cost Capitalized Subsequent to Acquisition		9,924
Basis at Close of Period, Land		992
Basis at Close of Period, Building and Improvements		11,640
Basis at Close of Period, Leasehold Interests		0
Total		12,632
Accumulated Depreciation		7,259
Book Value		5,373
Related Debt		$ 11,778
Buildings and Improvements Depreciable Lives in Years		50 years
Shopping Centers | Smallwood Village Center, Waldorf, MD
Real Estate Properties [Line Items]
Initial Basis		$ 17,819
Cost Capitalized Subsequent to Acquisition		7,619
Basis at Close of Period, Land		6,402
Basis at Close of Period, Building and Improvements		19,036
Basis at Close of Period, Leasehold Interests		0
Total		25,438
Accumulated Depreciation		5,763
Book Value		19,675
Related Debt		$ 0
Buildings and Improvements Depreciable Lives in Years		40 years
Shopping Centers | Southdale, Glen Burnie, MD
Real Estate Properties [Line Items]
Initial Basis		$ 3,650
Cost Capitalized Subsequent to Acquisition		21,366
Basis at Close of Period, Land		0
Basis at Close of Period, Building and Improvements		24,394
Basis at Close of Period, Leasehold Interests		622
Total		25,016
Accumulated Depreciation		20,890
Book Value		4,126
Related Debt		$ 0
Buildings and Improvements Depreciable Lives in Years		40 years
Shopping Centers | Southside Plaza, Richmond, VA
Real Estate Properties [Line Items]
Initial Basis		$ 6,728
Cost Capitalized Subsequent to Acquisition		10,357
Basis at Close of Period, Land		1,878
Basis at Close of Period, Building and Improvements		15,207
Basis at Close of Period, Leasehold Interests		0
Total		17,085
Accumulated Depreciation		11,595
Book Value		5,490
Related Debt		$ 0
Buildings and Improvements Depreciable Lives in Years		40 years
Shopping Centers | South Dekalb Plaza, Atlanta, GA
Real Estate Properties [Line Items]
Initial Basis		$ 2,474
Cost Capitalized Subsequent to Acquisition		4,130
Basis at Close of Period, Land		703
Basis at Close of Period, Building and Improvements		5,901
Basis at Close of Period, Leasehold Interests		0
Total		6,604
Accumulated Depreciation		4,491
Book Value		2,113
Related Debt		$ 0
Buildings and Improvements Depreciable Lives in Years		40 years
Shopping Centers | Thruway, Winston-Salem, NC
Real Estate Properties [Line Items]
Initial Basis		$ 4,778
Cost Capitalized Subsequent to Acquisition		23,579
Basis at Close of Period, Land		5,496
Basis at Close of Period, Building and Improvements		22,756
Basis at Close of Period, Leasehold Interests		105
Total		28,357
Accumulated Depreciation		14,760
Book Value		13,597
Related Debt		$ 40,360
Buildings and Improvements Depreciable Lives in Years		40 years
Shopping Centers | Village Center, Centreville, VA
Real Estate Properties [Line Items]
Initial Basis		$ 16,502
Cost Capitalized Subsequent to Acquisition		1,971
Basis at Close of Period, Land		7,851
Basis at Close of Period, Building and Improvements		10,622
Basis at Close of Period, Leasehold Interests		0
Total		18,473
Accumulated Depreciation		6,003
Book Value		12,470
Related Debt		$ 14,197
Buildings and Improvements Depreciable Lives in Years		40 years
Shopping Centers | Westview Village, Frederick, MD
Real Estate Properties [Line Items]
Initial Basis		$ 6,047
Cost Capitalized Subsequent to Acquisition		22,499
Basis at Close of Period, Land		6,047
Basis at Close of Period, Building and Improvements		22,499
Basis at Close of Period, Leasehold Interests		0
Total		28,546
Accumulated Depreciation		5,310
Book Value		23,236
Related Debt		$ 0
Buildings and Improvements Depreciable Lives in Years		50 years
Shopping Centers | White Oak, Silver Spring, MD
Real Estate Properties [Line Items]
Initial Basis		$ 6,277
Cost Capitalized Subsequent to Acquisition		5,357
Basis at Close of Period, Land		4,649
Basis at Close of Period, Building and Improvements		6,985
Basis at Close of Period, Leasehold Interests		0
Total		11,634
Accumulated Depreciation		5,758
Book Value		5,876
Related Debt		$ 25,088
Buildings and Improvements Depreciable Lives in Years		40 years
Shopping Centers | Other Buildings / Improvements
Real Estate Properties [Line Items]
Cost Capitalized Subsequent to Acquisition		$ 221
Basis at Close of Period, Building and Improvements		221
Total		221
Accumulated Depreciation		95
Book Value		126
Related Debt		0
Mixed-Use Properties
Real Estate Properties [Line Items]
Initial Basis		41,725
Cost Capitalized Subsequent to Acquisition		333,429
Basis at Close of Period, Land		26,254
Basis at Close of Period, Building and Improvements		348,900
Basis at Close of Period, Leasehold Interests		0
Total		375,154
Accumulated Depreciation		129,848
Book Value		245,306
Related Debt		$ 172,791
Mixed-Use Properties | 1500/1580/1582/1584 Rockville Pike, Rockville, MD | Acquisition Date One
Real Estate Properties [Line Items]
Buildings and Improvements Depreciable Lives in Years		5 years
Mixed-Use Properties | 1500/1580/1582/1584 Rockville Pike, Rockville, MD | Acquisition Date Two
Real Estate Properties [Line Items]
Buildings and Improvements Depreciable Lives in Years		10 years
Mixed-Use Properties | 1500/1580/1582/1584 Rockville Pike, Rockville, MD | Acquisition Date Three
Real Estate Properties [Line Items]
Buildings and Improvements Depreciable Lives in Years		5 years
Mixed-Use Properties | 1500/1580/1582/1584 Rockville Pike, Rockville, MD | Acquisition Date Four
Real Estate Properties [Line Items]
Buildings and Improvements Depreciable Lives in Years		4 years
Mixed-Use Properties | Avenel Business Park, Gaithersburg, MD
Real Estate Properties [Line Items]
Initial Basis		$ 21,459
Cost Capitalized Subsequent to Acquisition		28,896
Basis at Close of Period, Land		3,756
Basis at Close of Period, Building and Improvements		46,599
Basis at Close of Period, Leasehold Interests		0
Total		50,355
Accumulated Depreciation		33,503
Book Value		16,852
Related Debt		$ 29,714
Mixed-Use Properties | Avenel Business Park, Gaithersburg, MD | Minimum
Real Estate Properties [Line Items]
Buildings and Improvements Depreciable Lives in Years		35 years
Mixed-Use Properties | Avenel Business Park, Gaithersburg, MD | Maximum
Real Estate Properties [Line Items]
Buildings and Improvements Depreciable Lives in Years		40 years
Mixed-Use Properties | Clarendon Center, Arlington, VA (1)
Real Estate Properties [Line Items]
Initial Basis	[1]	$ 12,753
Cost Capitalized Subsequent to Acquisition	[1]	185,129
Basis at Close of Period, Land	[1]	16,287
Basis at Close of Period, Building and Improvements	[1]	181,595
Basis at Close of Period, Leasehold Interests	[1]	0
Total	[1]	197,882
Accumulated Depreciation	[1]	27,412
Book Value	[1]	170,470
Related Debt	[1]	$ 112,299
Buildings and Improvements Depreciable Lives in Years		50 years
Mixed-Use Properties | 601 Pennsylvania Ave., Washington, DC
Real Estate Properties [Line Items]
Initial Basis		$ 5,479
Cost Capitalized Subsequent to Acquisition		65,773
Basis at Close of Period, Land		5,667
Basis at Close of Period, Building and Improvements		65,585
Basis at Close of Period, Leasehold Interests		0
Total		71,252
Accumulated Depreciation		47,842
Book Value		23,410
Related Debt		$ 0
Buildings and Improvements Depreciable Lives in Years		35 years
Mixed-Use Properties | Washington Square, Alexandria, VA
Real Estate Properties [Line Items]
Initial Basis		$ 2,034
Cost Capitalized Subsequent to Acquisition		53,631
Basis at Close of Period, Land		544
Basis at Close of Period, Building and Improvements		55,121
Basis at Close of Period, Leasehold Interests		0
Total		55,665
Accumulated Depreciation		21,091
Book Value		34,574
Related Debt		$ 30,778
Buildings and Improvements Depreciable Lives in Years		50 years
Development Land
Real Estate Properties [Line Items]
Initial Basis		$ 9,622
Cost Capitalized Subsequent to Acquisition		77,025
Basis at Close of Period, Land		11,644
Basis at Close of Period, Building and Improvements		75,003
Basis at Close of Period, Leasehold Interests		0
Total		86,647
Accumulated Depreciation		0
Book Value		86,647
Development Land, Related Debt		45,208
Development Land | Ashland Square Phase II, Manassas, VA
Real Estate Properties [Line Items]
Initial Basis		5,292
Cost Capitalized Subsequent to Acquisition		1,736
Basis at Close of Period, Land		7,028
Basis at Close of Period, Building and Improvements		0
Basis at Close of Period, Leasehold Interests		0
Total		7,028
Accumulated Depreciation		0
Book Value		7,028
Development Land, Related Debt		0
Development Land | New Market, New Market, MD
Real Estate Properties [Line Items]
Initial Basis		2,088
Cost Capitalized Subsequent to Acquisition		286
Basis at Close of Period, Land		2,374
Basis at Close of Period, Building and Improvements		0
Basis at Close of Period, Leasehold Interests		0
Total		2,374
Accumulated Depreciation		0
Book Value		2,374
Development Land, Related Debt		0
Development Land | Park Van Ness, Washington, DC
Real Estate Properties [Line Items]
Initial Basis		2,242
Cost Capitalized Subsequent to Acquisition		75,003
Basis at Close of Period, Land		2,242
Basis at Close of Period, Building and Improvements		75,003
Basis at Close of Period, Leasehold Interests		0
Total		77,245
Accumulated Depreciation		0
Book Value		77,245
Development Land, Related Debt		$ 45,208
[1]	Includes the North and South Blocks and Residential

Real Estate and Accumulated D70

Real Estate and Accumulated Depreciation - Additional Information (Detail) - USD ($) $ in Billions	Dec. 31, 2015	Dec. 31, 2014
SEC Schedule III, Real Estate and Accumulated Depreciation Disclosure [Abstract]
Real estate investments for federal income tax	$ 1.1	$ 1.2

Real Estate and Accumulated D71

Real Estate and Accumulated Depreciation - Estimated Useful Lives of Assets (Detail)	12 Months Ended
	Dec. 31, 2015
Base Building | Minimum
Property Plant and Equipment Estimated Useful Lives [Line Items]
Estimated useful life	35 years
Base Building | Maximum
Property Plant and Equipment Estimated Useful Lives [Line Items]
Estimated useful life	50 years
Building Components | Maximum
Property Plant and Equipment Estimated Useful Lives [Line Items]
Estimated useful life	20 years

Real Estate and Accumulated D72

Real Estate and Accumulated Depreciation - Changes in Total Real Estate Investments and Related Accumulated Depreciation (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Total real estate investments:
Balance, beginning of year	$ 1,560,159	$ 1,459,439	$ 1,466,068
Acquisitions	4,894	70,921	5,124
Improvements	70,067	34,417	21,991
Retirements	(1,981)	(4,618)	(33,744)
Transfers to assets held for sale	(10,429)	0	0
Balance, end of year	1,622,710	1,560,159	1,459,439
Total accumulated depreciation:
Balance, beginning of year	396,617	364,663	353,305
Depreciation expense	37,698	35,933	43,204
Retirements	(1,911)	(3,979)	(31,846)
Transfers to assets held for sale	(7,034)	0	0
Balance, end of year	$ 425,370	$ 396,617	$ 364,663