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Long-Term Debt - Components of Long-Term Debt (Detail) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Sep. 21, 2015
Debt Instrument [Line Items]      
Other long-term debt $ 5,676 $ 5,953  
Less: unamortized debt issuance costs, discount and premium (39,453) (41,128)  
Long-term debt 3,258,212 3,193,487  
Less: current portion (36,503) (34,112)  
Long-term debt 3,221,709 3,159,375  
Amended and Restated Senior Credit Facility [Member] | Senior Secured Term A Loans [Member]      
Debt Instrument [Line Items]      
Senior Secured 361,000 365,750  
Amended and Restated Senior Credit Facility [Member] | Senior Secured Term B Loans [Member]      
Debt Instrument [Line Items]      
Senior Secured 1,369,416 1,372,912  
Amended and Restated Senior Credit Facility [Member] | Senior Secured Revolving Line of Credit [Member]      
Debt Instrument [Line Items]      
Senior Secured 71,573    
6.125% Senior Notes Due 2021 [Member]      
Debt Instrument [Line Items]      
Senior Notes 150,000 150,000  
5.125% Senior Notes Due 2022 [Member]      
Debt Instrument [Line Items]      
Senior Notes 300,000 300,000  
5.625% Senior Notes Due 2023 [Member]      
Debt Instrument [Line Items]      
Senior Notes 650,000 650,000 $ 650,000
6.500% Senior Notes Due 2024 [Member]      
Debt Instrument [Line Items]      
Senior Notes $ 390,000 $ 390,000