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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, 2014
Dec. 31, 2013
Payables And Accruals [Abstract]    
Accounts payable $ 17,855 $ 18,605
Accrued salaries and bonuses 65,747 189,439
Accrued payroll taxes and benefits 34,383 43,403
Accrued professional liabilities 18,596 19,324
Accrued contingent consideration 20,537 19,833
Other accrued expenses 20,970 18,150
Accounts payable and accrued expenses, total $ 178,088 $ 308,754