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Debt - Details of Debt (Detail) - USD ($)
$ in Thousands
9 Months Ended
Dec. 06, 2017
Feb. 21, 2017
Sep. 30, 2018
Dec. 31, 2017
Debt Instrument [Line Items]        
Amended and Restated Credit Agreement     $ 269,536  
Less: Original issue discount (net of amortization)     (1,442) $ (1,681)
Less: Debt issuance costs     (4,024) (4,580)
Total debt     264,070 265,312
Less: Current portion of long-term debt     (1,670) (1,702)
Long-term debt     262,400 263,610
Amended and Restated Credit Agreement | London Interbank Offered Rate (LIBOR)        
Debt Instrument [Line Items]        
Debt, variable interest rate (as a percent) 2.25% 2.50%    
Term Loan Facility | Amended and Restated Credit Agreement        
Debt Instrument [Line Items]        
Amended and Restated Credit Agreement     $ 269,536 $ 271,573
Term Loan Facility | Amended and Restated Credit Agreement | London Interbank Offered Rate (LIBOR)        
Debt Instrument [Line Items]        
Floor rate     0.75%  
Debt, variable interest rate (as a percent)     2.25%