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Long-Term Debt - Schedule of maturity profile of term loan outstanding net of debt amortization expense (Detail) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Debt Instrument [Line Items]    
Total $ 1,663,864 $ 1,340,908
Term Loan Credit Facility    
Debt Instrument [Line Items]    
2021 8,386  
2022 33,564  
2023 526,749  
Total $ 568,699 $ 593,850