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Income Taxes Deferred Income Tax Assets and Liabilities Recorded on Consolidated Balance Sheets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Deferred tax assets:        
Accrued employee benefits $ 21,463 $ 32,622    
Accrued expenses 0 10,065    
Operating loss carryovers(a) 459,644 91,934    
Pensions 64,799 96,635    
Tax credit carryovers 11,634 1,029    
Other 44,714 34,866    
Gross deferred tax assets 602,254 267,151    
Valuation allowance(a) (458,288) (69,900) $ (84,137) $ (30,768)
Deferred tax assets 143,966 197,251    
Deferred tax liabilities:        
Depreciation (334,162) (379,161)    
Intangibles (113,792) (99,969)    
Hedge of Net Investment of Foreign Subsidiary (17,028) (51,192)    
Other (24,265) (18,536)    
Deferred tax liabilities (489,247) (548,858)    
Noncurrent deferred tax assets 25,108 61,132    
Noncurrent deferred tax liabilities (370,389) (412,739)    
Deferred Tax Liabilities, Net $ (345,281) $ (351,607)