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Debt - Summary of Long term Debt, Net of Current Portion (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Debt Disclosure [Line Items]    
Debt carrying amount $ 2,153,618 $ 3,229,582
Less: current portion 63,745 27,655
Less: debt issuance costs 60,545 29,840
Long-term debt, net of current portion 2,029,328 3,172,087
New Term Loan Facility [Member]    
Debt Disclosure [Line Items]    
Debt carrying amount 1,325,000  
Notes [Member]    
Debt Disclosure [Line Items]    
Debt carrying amount 775,000  
First Lien Term Loan    
Debt Disclosure [Line Items]    
Debt carrying amount   2,467,529
Second Lien Term Loan    
Debt Disclosure [Line Items]    
Debt carrying amount   760,000
New Revolving Credit Facility [Member]    
Debt Disclosure [Line Items]    
Debt carrying amount 50,000  
Notes Payable And Deferred Obligations [Member]    
Debt Disclosure [Line Items]    
Debt carrying amount $ 3,618 $ 2,053