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v3.10.0.1

Related Party Transactions - Additional Information (Detail) |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
May 09, 2018 shares | Dec. 08, 2016 | May 31, 2018 a shares | Aug. 31, 2016 a | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Related Party Transaction [Line Items] |  |  |  |  |  |  |
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 |  |  |  |  | $ 345,900 | $ 349,500 | $ 329,000
Deferred compensation, employee contribution, percentage |  |  |  |  | 2.00% |  |
Deferred compensation, employer contribution, percentage |  |  |  |  | 3 | 3 | 3
Deferred compensation, company contribution, amount |  |  |  |  | $ 282,500 | $ 228,500 | $ 250,800
Deferred compensation, cumulative unfunded liability |  |  |  |  | 2,700,000 | 2,400,000 |
Ancillary costs and expenses |  |  |  |  | 8,400,000 | 8,100,000 | 7,200,000
Liability due to the Saul Organization for the company's share of these ancillary costs and expenses |  |  |  |  | 933,400 | 993,200 |
Automatic renewal period |  | 12 months |  |  |  |  |
Insurance commissions and fees expense |  |  |  |  | $ 407,900 | $ 288,400 | $ 360,500
Area of real estate property (in square feet) | a |  |  | 13,700 | 13,700 |  |  |
Ashbrook Marketplace | BF Saul Real Estate Investment Trust |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Limited partnership units issued (in shares) | shares | 176,680 |  | 176,680 |  |  |  |

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