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Long-Term Debt - Components of Long-Term Debt (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Sep. 21, 2015
Debt Instrument [Line Items]      
Other long-term debt $ 3,625 $ 4,821  
Less: unamortized debt issuance costs, discount and premium (30,802) (31,400)  
Long-term debt 3,122,426 3,149,099  
Less: current portion (153,478) (43,679)  
Long-term debt 2,968,948 3,105,420  
Amended and Restated Senior Credit Facility [Member] | Senior Secured Term A Loan [Member]      
Debt Instrument [Line Items]      
Senior Secured 311,733 346,750  
Amended and Restated Senior Credit Facility [Member] | Senior Secured Term B Loans [Member]      
Debt Instrument [Line Items]      
Senior Secured 872,870 1,338,928  
6.125% Senior Notes Due 2021 [Member]      
Debt Instrument [Line Items]      
Senior Notes   150,000  
5.125% Senior Notes Due 2022 [Member]      
Debt Instrument [Line Items]      
Senior Notes   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  
5.500% Senior Notes due 2028 [Member]      
Debt Instrument [Line Items]      
Senior Notes 450,000    
5.000% Senior Notes due 2029 [Member]      
Debt Instrument [Line Items]      
Senior Notes $ 475,000