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Summary of Accrued Expenses (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2013
Dec. 31, 2012
Schedule of Accrued Liabilities [Line Items]    
Salaries, wages, payroll taxes and benefits $ 44,100 $ 55,430
Workers' compensation liability 69,580 68,441
Property, sales, use and other taxes 12,023 9,749
Insurance, other than workers' compensation 6,601 10,419
Accrued interest payable 14,527 7,664
Deferred revenue-current   1,523
Other 6,834 5,406
Accrued expenses $ 153,665 $ 158,632