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Related Party Transactions (Details) |  | 1 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Dec. 08, 2016 | Aug. 31, 2016 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($) | Dec. 31, 2016 USD ($)
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 |  |  | $ 270,600 | $ 255,000 |
Deferred compensation, employee contribution, percentage |  |  | 2.00% |  |
Deferred compensation, company contribution, amount |  |  | $ 154,300 | $ 129,000 |
Deferred compensation, company contribution, percentage |  |  | 3 | 3 |
Deferred compensation, cumulative unfunded liability |  |  | $ 2,300,000 |  | $ 2,100,000
Ancillary costs and expenses |  |  | 6,300,000 | $ 5,500,000 |
Liability due to The Saul Organization for the Company's share of these ancillary costs and expenses |  |  | $ 744,200 |  | $ 860,700
Purchases from related party |  | $ 8,800,000 |  |  |
Percentage of annual increase in base rent |  |  | 3.00% |  |
Rent expense |  |  | $ 578,200 | 617,100 |
Insurance commissions and fees expense |  |  | $ 173,800 | $ 279,100 |
BF Saul Real Estate Investment Trust | Affiliated Entity |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Automatic renewal period | 12 months |  |  |  |

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