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Summary of Accrued Expenses (Detail) - USD ($) $ in Thousands | Jun. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Payables And Accruals [Abstract] |  |
Salaries, wages, payroll taxes and benefits | $ 32,916 | $ 52,956
Workers' compensation liability | 75,072 | 77,348
Property, sales, use and other taxes | 9,158 | 11,644
Insurance, other than workers' compensation | 12,082 | 9,632
Accrued interest payable | 7,419 | 7,427
Other | 34,806 | 14,459
Accrued expenses | $ 171,453 | $ 173,466

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