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Related Party Transactions - Additional Information (Detail)
 12 Months Ended
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
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 $ 400,000 $ 379,000 $ 369,000  
Deferred compensation, employee contribution, percentage 2.00%      
Deferred compensation, employer contribution, percentage 3 3 3  
Deferred compensation, company contribution, amount $ 224,900 $ 192,800 $ 191,300  
Deferred compensation, cumulative unfunded liability 1,800,000 1,800,000    
Ancillary costs and expenses 8,200,000 7,400,000 6,300,000  
Liability due to the Saul Organization for the company's share of these ancillary costs and expenses 655,000 543,000    
Insurance commissions and fees expense $ 443,500 427,300 447,300  
Monthly consulting fees       $ 60,000
Consulting fees   $ 495,000 $ 720,000