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Tax Effect of Significant Temporary Differences Representing Deferred Tax Assets and Liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Schedule of Deferred Income Tax Assets and Liabilities [Line Items]    
Total deferred tax assets $ 359,073 $ 274,973
Total deferred tax liabilities (706,034) (921,510)
Net deferred tax liability (346,961) (646,537)
Net Operating Loss Carryforwards    
Schedule of Deferred Income Tax Assets and Liabilities [Line Items]    
Total deferred tax assets 285,542 203,485
Alternative Minimum Tax Credit    
Schedule of Deferred Income Tax Assets and Liabilities [Line Items]    
Total deferred tax assets 7,907 7,907
Scientific Research and Experimental Development Tax Credit    
Schedule of Deferred Income Tax Assets and Liabilities [Line Items]    
Total deferred tax assets 898  
Workers Compensation Allowance    
Schedule of Deferred Income Tax Assets and Liabilities [Line Items]    
Total deferred tax assets 19,662 26,157
Expense Associated with Stock Options and Restricted Stock    
Schedule of Deferred Income Tax Assets and Liabilities [Line Items]    
Total deferred tax assets 12,338 17,116
Federal benefit of state deferred tax liabilities    
Schedule of Deferred Income Tax Assets and Liabilities [Line Items]    
Total deferred tax assets 5,660 5,310
All Other    
Schedule of Deferred Income Tax Assets and Liabilities [Line Items]    
Total deferred tax assets 27,066 14,998
Total deferred tax liabilities (10,923) (9,538)
Property and equipment basis difference    
Schedule of Deferred Income Tax Assets and Liabilities [Line Items]    
Total deferred tax liabilities $ (695,111) $ (911,972)