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Debt - Summary of Total Debt (Detail) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
Debt issuance costs $ (12,451) $ (13,203)
Total debt 666,572 671,756
Less: current portion of term credit facility 20,788 20,767
Less: current portion of debt issuance costs (2,959) (2,980)
Total long-term debt 645,784 650,989
5.750% Senior Notes, due August 2026 [Member] | Senior Notes [Member]    
Debt Instrument [Line Items]    
Total debt 400,000 400,000
Term Credit Facility [Member]    
Debt Instrument [Line Items]    
Total debt 279,023 284,959
Less: current portion of term credit facility $ 23,747 $ 23,747