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Accounts Payable and Accrued Expenses - Schedule of Accounts Payable and Accrued Expenses (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Accrued And Other Current Liabilities [Line Items]    
Accounts payable $ 9,584 $ 13,812
Accrued salaries and bonuses 53,742 160,495
Accrued payroll taxes and benefits 29,236 36,176
Accrued contingent consideration 18,896 16,109
Accrued professional liabilities 17,865 17,466
Other accrued expenses 21,402 11,603
Accounts payable and accrued expenses, total $ 150,725 $ 255,661