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Summary of Accrued Expenses (Detail) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2012 | Dec. 31, 2011
--- | --- | ---
Schedule of Accrued Liabilities [Line Items] |  |
Salaries, wages, payroll taxes and benefits | $ 43,713 | $ 58,692
Workers' compensation liability | 66,636 | 66,121
Property, sales, use and other taxes | 14,074 | 11,850
Insurance, other than workers' compensation | 8,022 | 6,012
Accrued interest payable | 11,544 | 4,937
Deferred revenue-current | 3,330 | 7,229
2009 Performance Unit Awards |  | 3,640
Other | 9,360 | 6,148
Accrued expenses | $ 156,679 | $ 164,629

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