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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, 2013
Dec. 31, 2012
Payables And Accruals [Abstract]    
Accounts payable $ 11,474 $ 13,812
Accrued salaries and bonuses 142,847 160,495
Accrued payroll taxes and benefits 44,762 36,176
Accrued professional liabilities 17,224 17,466
Accrued contingent consideration 20,103 16,109
Other accrued liabilities 20,186 11,603
Accounts payable and accrued expenses, total $ 256,596 $ 255,661