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Accounts Payable and Accrued Expenses - Schedule of Accounts Payable and Accrued Expenses (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Accrued And Other Current Liabilities [Line Items]    
Accounts payable $ 13,812 $ 12,264
Accrued salaries and bonuses 160,495 147,613
Accrued payroll taxes and benefits 36,176 29,443
Accrued professional liability risks 17,466 13,218
Accrued contingent consideration 16,109 12,089
Accrual for uncertain tax positions   3,242
Other accrued expenses 11,603 16,666
Accounts payable and accrued expenses, total $ 255,661 $ 234,535