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Summary of Accrued Expenses (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Schedule of Accrued Liabilities [Line Items]    
Salaries, wages, payroll taxes and benefits $ 54,822 $ 45,836
Workers' compensation liability 77,933 74,975
Property, sales, use and other taxes 12,226 12,367
Insurance, other than workers' compensation 10,654 10,129
Accrued interest payable 7,585 7,604
Other 9,355 9,546
Accrued expenses $ 172,575 $ 160,457