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Accounts Payable and Accrued Expenses - Schedule of Accounts Payable and Accrued Expenses (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2013 | Dec. 31, 2012
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Payables And Accruals [Abstract] |  |
Accounts payable | $ 18,605 | $ 13,812
Accrued salaries and bonuses | 189,439 | 160,495
Accrued payroll taxes and benefits | 43,403 | 36,176
Accrued professional liability risks | 19,324 | 17,466
Accrued contingent consideration | 19,833 | 16,109
Other accrued expenses | 18,150 | 11,603
Accounts payable and accrued expenses, total | $ 308,754 | $ 255,661

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