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Subsequent Events - Additional Information (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2016
May. 24, 2016
Jan. 01, 2016
Dec. 31, 2015
Subsequent Event [Line Items]        
Quarterly payments on medical costs containment start date       Apr. 01, 2016
Quarterly payments on medical costs containment end date       Jan. 01, 2018
Scenario Forecast [Member]        
Subsequent Event [Line Items]        
Accelerated cash payment $ 5,000,000      
Subsequent Event [Member]        
Subsequent Event [Line Items]        
Settlement amount of workers' compensation liability costs with third party     $ 10,000,000  
Payments on medical costs containment     $ 1,250,000  
Accelerated cash payment   $ 2,500,000