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Related Party Transactions - Additional Information (Detail)
 1 Months Ended 12 Months Ended
Dec. 08, 2016
Aug. 31, 2016
USD ($)
a
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Sep. 04, 2012
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     $ 329,000 $ 400,000 $ 379,000  
Deferred compensation, employee contribution, percentage     2.00%      
Deferred compensation, employer contribution, percentage     3 3 3  
Deferred compensation, company contribution, amount     $ 250,800 $ 224,900 $ 192,800  
Deferred compensation, cumulative unfunded liability     2,100,000 1,800,000    
Ancillary costs and expenses     7,500,000 8,200,000 7,400,000  
Liability due to the Saul Organization for the company's share of these ancillary costs and expenses     829,000 655,000    
Automatic renewal period 12 months          
Insurance commissions and fees expense     $ 360,500 $ 443,500 427,300  
Monthly consulting fees           $ 60,000
Consulting fees         $ 495,000  
Initial purchase price   $ 8,800,000        
Area of real estate property (in square feet) | a   14.3