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Income Taxes - Deferred Tax Assets and Liabilities (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Deferred income tax liabilities -      
Property and equipment $ (218,739) $ (205,977)  
Goodwill (58,643) (48,201)  
Other intangibles (42,604) (46,661)  
Book/tax accounting method difference (50,764) (54,768)  
Total deferred income tax liabilities (370,750) (355,607)  
Deferred income tax assets -      
Accruals and reserves 64,944 42,966  
Accrued insurance 59,640 53,163  
Deferred revenue 15,336 16,259  
Net operating loss carryforwards 20,828 17,115  
Other 26,229 20,540  
Subtotal 186,977 150,043  
Valuation allowance (15,644) (9,344) (8,800)
Total deferred income tax assets 171,333 140,699  
Total net deferred income tax liabilities $ (199,417) $ (214,908)