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v3.20.2

Related Party Transactions (Details) |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Nov. 05, 2019 USD ($) a $ / shares shares | May 09, 2018 shares | Aug. 31, 2016 a | Jun. 30, 2021 USD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2019 USD ($) | Dec. 31, 2019 USD ($)
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 |  |  |  |  | $ 200,900 | $ 180,100 |
Deferred compensation, employee contribution, percentage |  |  |  |  | 2.00% |  |
Deferred compensation, company contribution, amount |  |  |  |  | $ 109,400 | $ 113,200 |
Deferred compensation, company contribution, percentage |  |  |  |  | 3 | 3 |
Deferred compensation, cumulative unfunded liability |  |  |  |  | $ 3,300,000 |  | $ 3,100,000
Ancillary costs and expenses |  |  |  |  | 4,200,000 | $ 4,400,000 |
Liability due to The Saul Organization for the Company's share of these ancillary costs and expenses |  |  |  |  | $ 740,300 |  | $ 918,700
Percentage of annual increase in base rent |  |  |  |  | 3.00% |  |
Rent expense |  |  |  |  | $ 407,600 | 386,100 |
Insurance commissions and fees expense |  |  |  |  | $ 224,400 | $ 172,800 |
Contribution Agreement |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Number of partnership units issued in transaction (in shares) | shares | 1,416,071 |  |  |  |  |  |
Value of units issued (in dollars per share) | $ / shares | $ 56.00 |  |  |  |  |  |
Value assigned to units issued | $ 79,300,000 |  |  |  |  |  |
BF Saul Real Estate Investment Trust | Land Contributed In Contribution Agreement [Member] |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Area of land | a | 6.8 |  |  |  |  |  |
BF Saul Real Estate Investment Trust | Leasehold Interest Contributed In Contribution Agreement [Member] |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Area of land | a | 1.3 |  |  |  |  |  |
Ashbrook Marketplace | BF Saul Real Estate Investment Trust |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Area of real estate acquired (in acres) | a |  |  | 13.7 |  |  |  |
Limited partnership units issued for purchase (in shares) | shares |  | 176,680 |  |  |  |  |
Minimum | Subsequent Event | Forecast | Ashbrook Marketplace | BF Saul Real Estate Investment Trust |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Partnership units potentially issuable |  |  |  | $ 3,500,000 |  |  |
Maximum | Subsequent Event | Forecast | Ashbrook Marketplace | BF Saul Real Estate Investment Trust |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |
Partnership units potentially issuable |  |  |  | $ 4,000,000.0 |  |  |

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