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Summary of Accrued Expenses (Detail) (USD $)
In Thousands
Sep. 30, 2011
Dec. 31, 2010
Schedule of Accrued Liabilities [Line Items]  
Salaries, wages, payroll taxes and benefits$ 37,425$ 39,866
Workers' compensation liability65,93563,011
Property, sales, use and other taxes13,7636,682
Insurance, other than workers' compensation6,01812,648
Accrued interest payable8,6094,879
Deferred revenue - current7,22910,220
2009 Performance Unit Awards4,563 
Other8,75910,009
Accrued Liabilities, Current, Total$ 152,301$ 147,315