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Summary of Accrued Expenses (Detail) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2012 | Dec. 31, 2011
--- | --- | ---
Schedule of Accrued Liabilities [Line Items] |  |
Salaries, wages, payroll taxes and benefits | $ 49,198 | $ 58,692
Workers' compensation liability | 66,214 | 66,121
Property, sales, use and other taxes | 13,776 | 11,850
Insurance, other than workers' compensation | 8,789 | 6,012
Accrued interest payable | 5,196 | 4,937
Deferred revenue - current | 5,137 | 7,229
2009 Performance Unit Awards |  | 3,640
Other | 5,072 | 6,148
Accrued expenses | $ 153,382 | $ 164,629

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