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Summary of Accrued Expenses (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Schedule of Accrued Liabilities [Line Items]    
Salaries, wages, payroll taxes and benefits $ 58,692 $ 39,866
Workers' compensation liability 66,121 63,011
Property, sales, use and other taxes 11,850 6,682
Insurance, other than workers' compensation 6,012 12,648
Accrued interest payable 4,937 4,879
Deferred revenue - current 7,229 10,220
2009 Performance Unit Awards 3,640  
Other 6,148 10,009
Accrued expenses $ 164,629 $ 147,315