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Income Taxes - Deferred Tax Assets and Liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Deferred income tax liabilities:      
Property and equipment $ (214,902) $ (189,793)  
Goodwill (83,097) (69,059)  
Other intangibles (33,566) (36,565)  
Other book/tax accounting method differences (41,241) (61,095)  
Total deferred income tax liabilities (372,806) (356,512)  
Deferred income tax assets:      
Accruals and reserves 21,681 25,070  
Accrued insurance 79,630 75,591  
Stock and incentive compensation and pension withdrawal liabilities 58,744 52,009  
Net operating loss carryforwards 37,362 27,255  
Other 7,546 10,894  
Subtotal 204,963 190,819  
Valuation allowance (14,991) (16,141) $ (13,000)
Total deferred income tax assets 189,972 174,678  
Total net deferred income tax liabilities $ (182,834) $ (181,834)