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Summary of Accrued Expenses (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Payables And Accruals [Abstract]    
Salaries, wages, payroll taxes and benefits $ 58,160 $ 50,438
Workers' compensation liability 83,772 80,751
Property, sales, use and other taxes 25,318 29,332
Insurance, other than workers' compensation 9,531 10,816
Accrued interest payable 15,774 7,558
Accrued merger and integration 2,403 16,101
Other 40,988 31,628
Accrued expenses $ 235,946 $ 226,624