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Accounts Payable and Accrued Expenses - Schedule of Accounts Payable and Accrued Expenses (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Payables and Accruals [Abstract]    
Accounts payable $ 59,771 $ 35,410
Accrued salaries and incentive compensation 184,849 193,631
Accrued payroll taxes and benefits 43,945 54,768
Accrued professional liabilities 50,607 44,699
Accrued interest 32,721 32,910
Other accrued expenses 51,264 49,219
Accounts payable and accrued expenses, total $ 423,157 $ 410,637