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Long-Term Debt - Components of Long-Term Debt (Detail) - USD ($)
$ in Thousands
Sep. 30, 2021
Mar. 17, 2021
Dec. 31, 2020
Nov. 13, 2020
Sep. 21, 2015
Debt Instrument [Line Items]          
Other long-term debt     $ 3,625    
Less: unamortized debt issuance costs, discount and premium $ (15,342)   (30,802)    
Long-term debt 1,429,345   3,122,426    
Less: current portion (15,938)   (153,478)    
Long-term debt 1,413,407   2,968,948    
Term Loan A [Member]          
Debt Instrument [Line Items]          
Senior Secured       $ 352,400  
New Credit Facility [Member] | Term Loan A [Member]          
Debt Instrument [Line Items]          
Senior Secured 419,687 $ 425,000      
New Credit Facility [Member] | Senior Secured Revolving Line of Credit [Member]          
Debt Instrument [Line Items]          
Senior Secured 100,000 $ 600,000      
Prior Credit Facility [Member] | Senior Secured Term A Loan [Member]          
Debt Instrument [Line Items]          
Senior Secured     311,733    
Prior Credit Facility [Member] | Senior Secured Term B Loans [Member]          
Debt Instrument [Line Items]          
Senior Secured     872,870    
5.625% Senior Notes Due 2023 [Member]          
Debt Instrument [Line Items]          
Senior Notes     650,000   $ 650,000
6.500% Senior Notes Due 2024 [Member]          
Debt Instrument [Line Items]          
Senior Notes     390,000    
5.500% Senior Notes due 2028 [Member]          
Debt Instrument [Line Items]          
Senior Notes 450,000   450,000    
5.000% Senior Notes due 2029 [Member]          
Debt Instrument [Line Items]          
Senior Notes $ 475,000   $ 475,000