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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, 2014
Dec. 31, 2013
Payables And Accruals [Abstract]    
Accounts payable $ 25,386 $ 18,605
Accrued salaries and bonuses 118,378 189,439
Accrued payroll taxes and benefits 42,901 43,403
Accrued professional liabilities 19,635 19,324
Accrued contingent consideration 14,545 19,833
Other accrued expenses 20,921 18,150
Accounts payable and accrued expenses, total $ 241,766 $ 308,754