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Debt - Additional Information (Detail)
1 Months Ended 9 Months Ended
Jun. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
May 31, 2015
USD ($)
Debt Instrument [Line Items]      
Debt issuance costs $ 1,900,000    
Provisions in future incremental borrowings (up to) 150,000,000    
Amount available for dividend payments under restrictive covenants   $ 186,000  
Minimum percentage of senior secured term loan for interest rate protection   25.00%  
Maximum [Member]      
Debt Instrument [Line Items]      
Leverage ratio   3.00  
Minimum [Member]      
Debt Instrument [Line Items]      
Default in payment of principal (greater than)   $ 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  
Revolving Credit Facility [Member] | Interest Rate Option, LIBOR Based [Member]      
Debt Instrument [Line Items]      
Interest rate, margin added 2.75%    
Commitment fees on unused portion of facility 0.50%    
Revolving Credit Facility [Member] | Interest Rate Option, Base Rate Based [Member]      
Debt Instrument [Line Items]      
Interest rate, margin added 1.75%    
Revolving Credit Facility [Member] | Letter Of Credit Subfacility [Member]      
Debt Instrument [Line Items]      
Maximum borrowing capacity $ 10,000,000