Accounts Payable and Accrued Expenses - Schedule of Accounts Payable and Accrued Expenses (Detail) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Payables and Accruals [Abstract]
Accounts payable	$ 31,636	$ 34,588
Accrued salaries and incentive compensation	65,711	193,112
Accrued payroll taxes and benefits	23,674	36,545
Accrued professional liabilities	29,034	32,039
Accrued interest	2,936	8,262
Other accrued expenses	54,044	46,252
Accounts payable and accrued expenses, total	$ 207,035	$ 350,798