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Tax Effect of Significant Temporary Differences Representing Deferred Tax Assets and Liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Schedule of Deferred Income Tax Assets and Liabilities [Line Items]    
Deferred tax assets, Current $ 47,148 $ 77,926
Deferred tax assets, Non-current 263,296 137,031
Allowance to reduce deferred tax asset to expected realizable value   (603)
Total deferred tax assets 310,444 214,354
Deferred tax liabilities, Non-current (946,272) (1,000,261)
Total deferred tax liabilities (956,981) (1,013,066)
Net deferred tax liability (646,537) (798,712)
Net Operating Loss Carryforwards    
Schedule of Deferred Income Tax Assets and Liabilities [Line Items]    
Deferred tax assets, Current 4,702 27,887
Deferred tax assets, Non-current 198,783 77,514
Workers Compensation Allowance    
Schedule of Deferred Income Tax Assets and Liabilities [Line Items]    
Deferred tax assets, Current 25,736 28,734
Other    
Schedule of Deferred Income Tax Assets and Liabilities [Line Items]    
Deferred tax assets, Current 16,710 21,305
Deferred tax assets, Non-current 19,137 20,441
Deferred tax liabilities, Current (10,709) (12,805)
Deferred tax liabilities, Non-current (16,789) (13,339)
AMT Credit    
Schedule of Deferred Income Tax Assets and Liabilities [Line Items]    
Deferred tax assets, Non-current 7,907  
Expense associated with employee stock options    
Schedule of Deferred Income Tax Assets and Liabilities [Line Items]    
Deferred tax assets, Non-current 14,443 14,591
Federal benefit of state deferred tax liabilities    
Schedule of Deferred Income Tax Assets and Liabilities [Line Items]    
Deferred tax assets, Non-current 23,026 24,485
Property and equipment basis difference    
Schedule of Deferred Income Tax Assets and Liabilities [Line Items]    
Deferred tax liabilities, Non-current $ (929,483) $ (986,922)