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Real Estate Acquired - Additional Information (Detail)	1 Months Ended								12 Months Ended
	Sep. 30, 2015 USD ($)	Feb. 28, 2015 USD ($) a	Dec. 31, 2014 USD ($) property	Aug. 31, 2014 USD ($)	Apr. 30, 2014 USD ($)	Jan. 31, 2014 USD ($)	Dec. 31, 2013 USD ($) ft² Property	Aug. 31, 2013 USD ($) ft²	Dec. 31, 2015 USD ($) property	Dec. 31, 2014 USD ($) property	Dec. 31, 2013 USD ($) ft² Property
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

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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