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Accounts Payable and Accrued Expenses - Schedule of Accounts Payable and Accrued Expenses (Detail) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
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Payables and Accruals [Abstract] |  |
Accounts payable | $ 28,474 | $ 21,969
Accrued salaries and bonuses | 220,635 | 233,499
Accrued payroll taxes and benefits | 67,830 | 58,979
Accrued professional liabilities | 28,972 | 25,995
Accrued contingent consideration | 6,566 | 13,565
Accrual for uncertain tax positions |  | 7,000
Accrued interest | 4,511 | 2,655
Other accrued expenses | 50,950 | 32,145
Accounts payable and accrued expenses, total | $ 407,938 | $ 395,807

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