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Summary of Accrued Expenses (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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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

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