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Related Party Transactions - Additional Information (Detail) |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Nov. 05, 2019 shares | Dec. 08, 2016 | May 31, 2018 shares | Aug. 31, 2016 USD ($) a shares | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
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% | 6.00% | 6.00%
Company contribution to a multi employer 401K plan at discretionary amount of employee's cash compensation, amount |  |  |  |  | $ 302,000 | $ 322,200 | $ 345,900
Deferred compensation, employee contribution, percentage |  |  |  |  | 2.00% |  |
Deferred compensation, employer contribution, percentage |  |  |  |  | 3 | 3 | 3
Deferred compensation, company contribution, amount |  |  |  |  | $ 241,300 | $ 345,200 | $ 282,500
Deferred compensation, cumulative unfunded liability |  |  |  |  | 2,900,000 | 3,100,000 |
Ancillary costs and expenses |  |  |  |  | 7,400,000 | 8,400,000 | 8,400,000
Liability due to the Saul Organization for the company's share of these ancillary costs and expenses |  |  |  |  | 782,700 | 918,700 |
Automatic renewal period |  | 12 months |  |  |  |  |
Insurance commissions and fees expense |  |  |  |  | 427,700 | $ 399,600 | $ 407,900
Contribution Agreement |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Number of partnership units issued in transaction (in shares) | shares | 1,416,071 |  |  |  |  |  |
Estimated reimbursement of costs incurred |  |  |  |  | $ 6,100,000 |  |
BF Saul Real Estate Investment Trust | Ashbrook Marketplace |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Area of real estate property (in square feet) | a |  |  |  | 13.7 |  |  |
Limited partnership units issued (in shares) | shares |  |  | 176,680 | 176,680 |  |  |
BF Saul Real Estate Investment Trust | Ashbrook Marketplace | Minimum |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Noncash financial or equity instrument consideration, future shares issued estimated value |  |  |  | $ 3,300,000 |  |  |
BF Saul Real Estate Investment Trust | Ashbrook Marketplace | Maximum |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Noncash financial or equity instrument consideration, future shares issued estimated value |  |  |  | $ 3,600,000 |  |  |

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