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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