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Income Taxes Deferred Income Tax Assets and Liabilities Recorded on Consolidated Balance Sheets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Deferred tax assets:        
Accrued employee benefits $ 21,878 $ 17,462    
Operating loss carryovers(a) 1,321,942 1,134,410    
Pensions 78,683 64,230    
Tax credit carryovers 1,582 1,497    
Other 57,370 64,955    
Gross deferred tax assets 1,481,455 1,282,554    
Valuation allowance(a) (1,326,204) (1,148,268) $ (1,213,750) $ (458,288)
Deferred tax assets 155,251 134,286    
Deferred tax liabilities:        
Depreciation (348,700) (349,264)    
Intangibles (91,645) (88,934)    
Hedge of net investment of foreign subsidiary (13,514) (23,498)    
Other (75,927) (55,173)    
Deferred tax liabilities (529,786) (516,869)    
Deferred Tax Liabilities, Net (374,535) (382,583)    
Noncurrent deferred tax assets 20,317 15,275    
Noncurrent deferred tax liabilities 394,852 397,858    
Deferred Tax Liabilities, Net $ 374,535 $ 382,583