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Accounts Payable and Accrued Expenses - Schedule of Accounts Payable and Accrued Expenses (Detail) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Payables and Accruals [Abstract]    
Accounts payable $ 59,069 $ 59,771
Accrued salaries and incentive compensation 76,882 184,849
Accrued payroll taxes and benefits 46,913 43,945
Accrued professional liabilities 48,878 50,607
Accrued interest 13,751 32,721
Other accrued expenses 60,917 51,290
Accounts payable and accrued expenses, total $ 306,410 $ 423,183