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Accounts Payable and Accrued Expenses - Schedule of Accounts Payable and Accrued Expenses (Detail) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Payables and Accruals [Abstract]    
Accounts payable $ 27,339 $ 28,474
Accrued salaries and bonuses 191,470 220,635
Accrued payroll taxes and benefits 73,455 67,830
Accrued professional liabilities 37,325 28,972
Accrued contingent consideration 6,276 6,566
Accrued interest 14,244 4,511
Other accrued expenses 52,200 50,950
Accounts payable and accrued expenses, total $ 402,309 $ 407,938