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Goodwill and Intangible Assets - Schedule of estimated future amortization expenses (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]    
2021 $ 195,704  
2022 193,094  
2023 189,512  
2024 188,549  
2025 183,401  
Thereafter 602,536  
Total amortization expense $ 1,552,796 $ 1,700,596