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Accounts Payable and Accrued Expenses - Schedule of Accounts Payable and Accrued Expenses (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Payables And Accruals [Abstract]    
Accounts payable $ 11,740 $ 13,812
Accrued salaries and bonuses 100,580 160,495
Accrued payroll taxes and benefits 37,742 36,176
Accrued professional liabilities 18,771 17,466
Accrued contingent consideration 16,376 16,109
Other accrued expenses 18,945 11,603
Accounts payable and accrued expenses, total $ 204,154 $ 255,661