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Accounts Payable and Accrued Expenses - Schedule of Accounts Payable and Accrued Expenses (Detail) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Payables and Accruals [Abstract]    
Accounts payable $ 23,346 $ 21,969
Accrued salaries and bonuses 184,450 233,499
Accrued payroll taxes and benefits 64,938 58,979
Accrued professional liabilities 26,988 25,995
Accrued contingent consideration 7,086 13,565
Accrued uncertain tax positions   7,000
Accrued interest 14,884 2,655
Other accrued expenses 41,599 32,145
Accounts payable and accrued expenses, total $ 363,291 $ 395,807