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Summary of Accrued Expenses (Detail) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2013 | Dec. 31, 2012
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Schedule of Accrued Liabilities [Line Items] |  |
Salaries, wages, payroll taxes and benefits | $ 44,100 | $ 55,430
Workers' compensation liability | 69,580 | 68,441
Property, sales, use and other taxes | 12,023 | 9,749
Insurance, other than workers' compensation | 6,601 | 10,419
Accrued interest payable | 14,527 | 7,664
Deferred revenue-current |  | 1,523
Other | 6,834 | 5,406
Accrued expenses | $ 153,665 | $ 158,632

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