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Related Party Transactions - Additional Information (Detail) |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 08, 2016 | Aug. 31, 2016 USD ($) a | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Sep. 04, 2012 USD ($)
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 |  |  | $ 329,000 | $ 400,000 | $ 379,000 |
Deferred compensation, employee contribution, percentage |  |  | 2.00% |  |  |
Deferred compensation, employer contribution, percentage |  |  | 3 | 3 | 3 |
Deferred compensation, company contribution, amount |  |  | $ 250,800 | $ 224,900 | $ 192,800 |
Deferred compensation, cumulative unfunded liability |  |  | 2,100,000 | 1,800,000 |  |
Ancillary costs and expenses |  |  | 7,500,000 | 8,200,000 | 7,400,000 |
Liability due to the Saul Organization for the company's share of these ancillary costs and expenses |  |  | 829,000 | 655,000 |  |
Automatic renewal period | 12 months |  |  |  |  |
Insurance commissions and fees expense |  |  | $ 360,500 | $ 443,500 | 427,300 |
Monthly consulting fees |  |  |  |  |  | $ 60,000
Consulting fees |  |  |  |  | $ 495,000 |
Initial purchase price |  | $ 8,800,000 |  |  |  |
Area of real estate property (in square feet) | a |  | 14.3 |  |  |  |

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