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Debt - Principal Payments Due for Debt (Detail) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Debt Disclosure [Abstract]    
2022 $ 1,229,000  
2023 538,960  
2024 1,112,467  
2025 1,522,180  
Thereafter 6,253,730  
Total $ 10,656,337 $ 8,934,187