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Accounts Payable and Accrued Expenses - Schedule of Accounts Payable and Accrued Expenses (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Payables and Accruals [Abstract] |  |
Accounts payable | $ 31,059 | $ 34,632
Accrued salaries and bonuses | 249,834 | 225,429
Accrued payroll taxes and benefits | 80,369 | 75,672
Accrued professional liabilities | 34,931 | 37,912
Accrued contingent consideration | 18,760 | 6,259
Accrued interest | 9,477 | 4,495
Other accrued expenses | 44,912 | 53,618
Accounts payable and accrued expenses, total | $ 469,342 | $ 438,017

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