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Subsequent Events - Additional Information (Detail) - USD ($)
 3 Months Ended
Dec. 31, 2016
May 24, 2016
Apr. 01, 2016
Mar. 31, 2016
Subsequent Event [Line Items]        
Accelerated cash payment aggregate amount       $ 5,000,000
Agreement [Member]        
Subsequent Event [Line Items]        
Restricted money market funds and restricted certificates of deposit, current       38,800,000
Accelerated cash payment aggregate amount       5,000,000
Scenario Forecast [Member]        
Subsequent Event [Line Items]        
Accelerated cash payment, remaining amount $ 2,500,000      
Scenario Forecast [Member] | Agreement [Member]        
Subsequent Event [Line Items]        
Accelerated cash payment, remaining amount $ 2,500,000      
Cash-Secured Letters of Credit [Member] | Wells Fargo [Member] | Agreement [Member]        
Subsequent Event [Line Items]        
Credit facility borrowing capacity       $ 37,300,000
Subsequent Event [Member]        
Subsequent Event [Line Items]        
Settlement amount of workers' compensation liability costs with third party     $ 9,500,000  
Quarterly payment due for settlement of workers' compensation liability costs with third party     593,250  
Accelerated cash payment   $ 2,500,000    
Subsequent Event [Member] | Agreement [Member]        
Subsequent Event [Line Items]        
Restricted money market funds and restricted certificates of deposit, current     44,000,000  
Accelerated cash payment   $ 2,500,000    
Subsequent Event [Member] | Cash-Secured Letters of Credit [Member] | Wells Fargo [Member] | Agreement [Member]        
Subsequent Event [Line Items]        
Credit facility borrowing capacity     $ 42,300,000