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Accounts Payable and Accrued Expenses - Schedule of Accounts Payable and Accrued Expenses (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Payables and Accruals [Abstract]    
Accounts payable $ 22,174 $ 18,605
Accrued salaries and bonuses 170,855 189,439
Accrued payroll taxes and benefits 51,585 44,131
Accrued professional liabilities 18,693 19,324
Accrued contingent consideration 14,916 19,833
Other accrued expenses 22,098 17,422
Accounts payable and accrued expenses, total $ 300,321 $ 308,754