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Debt - Additional Information (Detail)
1 Months Ended 3 Months Ended 9 Months Ended
Jun. 30, 2015
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2015
USD ($)
May. 31, 2015
USD ($)
Debt Instrument [Line Items]        
Debt Pre Payment Penalty     $ 11,600,000  
Debt issuance costs $ 1,900,000      
Provisions in future incremental borrowings   $ 150,000,000 150,000,000  
Minimum percentage of senior secured term loan for interest rate protection   25.00%    
Amount available for dividend payments under restrictive covenants   $ 148,000,000 148,000,000  
Maximum [Member]        
Debt Instrument [Line Items]        
Leverage ratio   3.00    
Minimum [Member]        
Debt Instrument [Line Items]        
Leverage ratio   1    
Default in payment of principal   $ 10,000,000 10,000,000  
Revolving Credit Facility [Member]        
Debt Instrument [Line Items]        
Maximum borrowing capacity $ 50,000,000      
Maximum borrowing capacity prior limit       $ 25,000,000
Outstanding balance on the revolving credit facility   $ 0 0  
Interest Rate Option, LIBOR Based [Member] | Revolving Credit Facility [Member]        
Debt Instrument [Line Items]        
Interest rate, margin added   2.75%    
Commitment fees on unused portion of facility   0.50%    
Interest Rate Option, Base Rate Based [Member] | Revolving Credit Facility [Member]        
Debt Instrument [Line Items]        
Interest rate, margin added   1.75%    
Letter Of Credit Subfacility [Member] | Revolving Credit Facility [Member]        
Debt Instrument [Line Items]        
Maximum borrowing capacity   $ 10,000,000 $ 10,000,000