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Summary of Accrued Expenses (Detail) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Payables And Accruals [Abstract]    
Salaries, wages, payroll taxes and benefits $ 23,259 $ 27,055
Workers' compensation liability 70,073 75,358
Property, sales, use and other taxes 11,082 9,061
Insurance, other than workers' compensation 9,392 12,817
Accrued interest payable 13,925 7,668
Other 26,497 29,652
Accrued expenses $ 154,228 $ 161,611