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Accounts Payable and Accrued Expenses - Schedule of Accounts Payable and Accrued Expenses (Detail) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
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Payables and Accruals [Abstract] |  |
Accounts payable | $ 31,696 | $ 31,857
Accrued salaries and incentive compensation | 150,014 | 197,831
Accrued payroll taxes and benefits | 35,366 | 34,983
Accrued professional liabilities | 30,169 | 32,232
Accrued interest | 3,204 | 8,921
Other accrued expenses | 52,134 | 68,401
Accounts payable and accrued expenses, total | $ 302,583 | $ 374,225

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