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Summary of Accrued Expenses (Detail) (USD $) In Thousands | Sep. 30, 2011 | Dec. 31, 2010
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Schedule of Accrued Liabilities [Line Items] |  |
Salaries, wages, payroll taxes and benefits | $ 37,425 | $ 39,866
Workers' compensation liability | 65,935 | 63,011
Property, sales, use and other taxes | 13,763 | 6,682
Insurance, other than workers' compensation | 6,018 | 12,648
Accrued interest payable | 8,609 | 4,879
Deferred revenue - current | 7,229 | 10,220
2009 Performance Unit Awards | 4,563 |
Other | 8,759 | 10,009
Accrued Liabilities, Current, Total | $ 152,301 | $ 147,315

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