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Accounts Payable and Accrued Expenses - Schedule of Accounts Payable and Accrued Expenses (Detail) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
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Payables and Accruals [Abstract] |  |
Accounts payable | $ 32,149 | $ 31,059
Accrued salaries and bonuses | 105,565 | 242,888
Accrued payroll taxes and benefits | 52,385 | 78,415
Accrued professional liabilities | 41,198 | 34,931
Accrued contingent consideration | 15,069 | 18,760
Accrued interest | 26,516 | 9,477
Other accrued expenses | 40,075 | 33,037
Accounts payable and accrued expenses, total | $ 312,957 | $ 448,567

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