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Summary of Accrued Expenses (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Schedule of Accrued Liabilities [Line Items]    
Salaries, wages, payroll taxes and benefits $ 55,430 $ 58,692
Workers' compensation liability 68,441 66,121
Property, sales, use and other taxes 9,749 11,850
Insurance, other than workers' compensation 10,419 6,012
Accrued interest payable 7,664 4,937
Deferred revenue - current 1,523 7,229
2009 Performance Unit Awards   3,640
Other 5,406 6,148
Accrued expenses $ 158,632 $ 164,629