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Credit Facility - Additional Information (Detail) - USD ($)
1 Months Ended 12 Months Ended
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Line of Credit Facility [Line Items]      
Letters of credit outstanding aggregate amount   $ 23,200,000  
GE Loan Agreement      
Line of Credit Facility [Line Items]      
Line of credit facility maximum borrowing capacity $ 75,000,000 $ 55,500,000 $ 67,100,000
Line of credit facility, maturity date   Mar. 27, 2019  
Amount of credit facility outstanding   $ 0 $ 0
Rate of credit facility   2.25%  
GE Loan Agreement | London Interbank Offered Rate (LIBOR)      
Line of Credit Facility [Line Items]      
Applicable margin spread over base rate 2.25%    
GE Loan Agreement | Base Rate      
Line of Credit Facility [Line Items]      
Applicable margin spread over base rate 1.25%    
GE Loan Agreement | Minimum      
Line of Credit Facility [Line Items]      
Fixed charge coverage ratio   120.00%  
Percentage of fee for unused amount of credit facility   0.25%  
GE Loan Agreement | Maximum      
Line of Credit Facility [Line Items]      
Percentage of fee for unused amount of credit facility   0.50%