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Real Estate Acquired - Additional Information (Detail) | 1 Months Ended | 12 Months Ended
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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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