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Accounts Payable and Accrued Expenses - Schedule of Accounts Payable and Accrued Expenses (Detail) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Payables and Accruals [Abstract]    
Accounts payable $ 34,361 $ 59,771
Accrued salaries and incentive compensation 181,043 184,849
Accrued payroll taxes and benefits 39,399 43,945
Accrued professional liabilities 40,190 50,607
Accrued interest 13,562 32,721
Other accrued expenses 67,284 51,290
Accounts payable and accrued expenses, total $ 375,839 $ 423,183