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Summary of Accrued Expenses (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Schedule of Accrued Liabilities [Line Items]    
Salaries, wages, payroll taxes and benefits $ 39,276 $ 55,430
Workers' compensation liability 66,755 68,441
Property, sales, use and other taxes 7,211 9,749
Insurance, other than workers' compensation 6,104 10,419
Accrued interest payable 14,518 7,664
Deferred revenue-current   1,523
Other 7,653 5,406
Accrued expenses $ 141,517 $ 158,632