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Real Estate Acquired - Additional Information (Detail) | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Aug. 31, 2016 USD ($) | Sep. 30, 2015 USD ($) | Feb. 28, 2015 USD ($) a | Dec. 31, 2014 USD ($) property | Aug. 31, 2014 USD ($) | Apr. 30, 2014 USD ($) | Jan. 31, 2014 USD ($) | Dec. 31, 2016 USD ($) property | Dec. 31, 2016 USD ($) property | Dec. 31, 2015 USD ($) property | Dec. 31, 2014 USD ($) property
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Aggregate cost |  |  |  |  |  |  |  |  | $ 10,300,000 |  | $ 68,000,000
Rent expense |  |  |  |  |  |  |  |  | 843,300 | $ 904,900 | 840,800
Property acquisition costs |  |  |  | $ 900,000 |  |  |  | $ 60,400 | $ 60,400 |  | $ 900,000
Number of properties acquired | property |  |  |  | 5 |  |  |  | 2 | 2 | 1 | 5
Purchase price allocated to land |  |  |  | $ 66,047,000 |  |  |  | $ 9,432,000 | $ 9,432,000 |  | $ 66,047,000
Purchase price allocated to buildings |  |  |  | 4,873,000 |  |  |  | 874,000 | 874,000 |  | 4,873,000
Below market lease, carrying amount |  |  |  |  |  |  |  | 29,900,000 | 29,900,000 | $ 29,900,000 |
Below market lease, accumulated amortization |  |  |  |  |  |  |  | 15,500,000 | 15,500,000 | 13,700,000 |
Accretion income, intangible liabilities |  |  |  |  |  |  |  |  | 1,800,000 | 1,800,000 | 1,900,000
Lease acquisition costs |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Intangible assets gross carrying amount |  |  |  |  |  |  |  | 24,100,000 | 24,100,000 | 24,000,000 |
Intangible assets, accumulated amortization |  |  |  |  |  |  |  | 20,500,000 | 20,500,000 | 19,200,000 |
Amortization expense |  |  |  |  |  |  |  |  | $ 1,200,000 | 1,300,000 | 1,300,000
Weighted-average amortization period |  |  |  |  |  |  |  |  | 3 years 6 months |  |
Above Market Rent |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Intangible assets gross carrying amount |  |  |  |  |  |  |  | 1,000,000 | $ 1,000,000 | 1,000,000 |
Intangible assets, accumulated amortization |  |  |  |  |  |  |  | 999,700 | 999,700 | 998,200 |
Amortization expense |  |  |  |  |  |  |  |  | $ 1,500 | 1,500 | 22,500
Weighted-average amortization period |  |  |  |  |  |  |  |  | 1 year |  |
Below Market Leases |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Weighted-average amortization period |  |  |  |  |  |  |  |  | 5 years 10 months 24 days |  |
1580 Rockville Pike |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Aggregate cost |  |  |  |  |  |  | $ 8,000,000 |  |  |  |
Property acquisition costs |  |  |  |  |  |  | $ 200,000 |  |  |  |
Purchase price allocated to land |  |  |  | 9,600,000 |  |  |  |  |  |  | 9,600,000
Purchase price allocated to buildings |  |  |  | 2,200,000 |  |  |  |  |  |  | 2,200,000
1582 Rockville Pike |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Aggregate cost |  |  |  |  |  | $ 11,000,000 |  |  |  |  |
Property acquisition costs |  |  |  |  |  | $ 200,000 |  |  |  |  |
Purchase price allocated to land |  |  |  | 9,742,000 |  |  |  |  |  |  | 9,742,000
Purchase price allocated to buildings |  |  |  | 828,000 |  |  |  |  |  |  | 828,000
1584 Rockville Pike |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Aggregate cost |  |  |  | 6,200,000 |  |  |  |  |  |  |
Property acquisition costs |  |  |  |  |  |  |  |  |  | 200,000 |
Purchase price allocated to land |  |  |  | 5,798,000 |  |  |  |  |  |  | 5,798,000
Purchase price allocated to buildings |  |  |  | 440,000 |  |  |  |  |  |  | 440,000
750 N. Glebe Road |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Aggregate cost |  |  |  |  | $ 40,000,000 |  |  |  |  |  |
Property acquisition costs |  |  |  |  | $ 400,000 |  |  |  |  |  |
Purchase price allocated to land |  |  |  | 38,224,000 |  |  |  |  |  |  | 38,224,000
Purchase price allocated to buildings |  |  |  | 1,327,000 |  |  |  |  |  |  | 1,327,000
730 N. Glebe Road |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Aggregate cost |  |  |  | 2,800,000 |  |  |  |  |  |  |
Property acquisition costs |  |  |  |  |  |  |  |  |  | 40,400 |
Purchase price allocated to land |  |  |  | 2,683,000 |  |  |  |  |  |  | 2,683,000
Purchase price allocated to buildings |  |  |  | $ 78,000 |  |  |  |  |  |  | $ 78,000
726 N Glebe Road |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Aggregate cost |  | $ 4,000,000 |  |  |  |  |  |  |  | 4,000,000 |
Property acquisition costs |  | $ 100,000 |  |  |  |  |  |  |  | 100,000 |
Purchase price allocated to land |  |  |  |  |  |  |  |  |  | 3,900,000 |
Purchase price allocated to buildings |  |  |  |  |  |  |  |  |  | $ 100,000 |
700 N. Glebe Road |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Aggregate cost | $ 7,200,000 |  |  |  |  |  |  |  |  |  |
Purchase price allocated to land |  |  |  |  |  |  |  | 7,236,000 | $ 7,236,000 |  |
Purchase price allocated to buildings |  |  |  |  |  |  |  | 0 | 0 |  |
Westview Pad |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Aggregate cost |  |  | $ 900,000 |  |  |  |  |  |  |  |
Area of real estate property (in square feet) | a |  |  | 1.1 |  |  |  |  |  |  |  |
Thruway Pad |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Aggregate cost | 3,100,000 |  |  |  |  |  |  |  |  |  |
Property acquisition costs | $ 60,000 |  |  |  |  |  |  |  |  |  |
Purchase price allocated to land |  |  |  |  |  |  |  | 2,196,000 | 2,196,000 |  |
Purchase price allocated to buildings |  |  |  |  |  |  |  | 874,000 | 874,000 |  |
Beacon Center |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Aggregate cost |  |  |  |  |  |  |  | 22,500,000 |  |  |
Rent expense |  |  |  |  |  |  |  |  | 60,000 |  |
Mortgage loans on real estate, period increase (decrease) |  |  |  |  |  |  |  | 11,250,000 |  |  |
Southdale |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Aggregate cost |  |  |  |  |  |  |  | $ 15,000,000 |  |  |
Rent expense |  |  |  |  |  |  |  |  | $ 60,000 |  |

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