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Accounts Payable and Accrued Expenses - Schedule of Accounts Payable and Accrued Expenses (Detail) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Payables and Accruals [Abstract]    
Accounts payable $ 36,645 $ 59,771
Accrued salaries and incentive compensation 213,974 184,849
Accrued payroll taxes and benefits 34,994 43,945
Accrued professional liabilities 37,729 50,607
Accrued interest 29,052 32,721
Other accrued expenses 41,724 51,290
Accounts payable and accrued expenses, total $ 394,118 $ 423,183