XML 69 R55.htm IDEA: XBRL DOCUMENT 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