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Income Taxes - Deferred Tax Assets and Liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Deferred income tax liabilities:      
Property and equipment $ (189,793) $ (185,007)  
Goodwill (69,059) (70,832)  
Other intangibles (36,565) (48,344)  
Other book/tax accounting method differences (61,095) (63,819)  
Total deferred income tax liabilities (356,512) (368,002)  
Deferred income tax assets:      
Accruals and reserves 25,070 20,835  
Accrued insurance 75,591 64,745  
Stock and incentive compensation and pension withdrawal liabilities 52,009 53,155  
Net operating loss carryforwards 27,255 19,353  
Other 10,894 10,194  
Subtotal 190,819 168,282  
Valuation allowance (16,141) (13,028) $ (13,300)
Total deferred income tax assets 174,678 155,254  
Total net deferred income tax liabilities $ (181,834) $ (212,748)