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Income Taxes - Deferred Income Tax Assets (Liabilities) (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Income Tax Disclosure [Abstract]    
Tax credit carryforwards $ 64,895 $ 222,353
Research and development expenses 76,906 92,443
Net operating loss carryforwards 187,741 139,544
Allowances and reserves 94,168 178,930
Deferred compensation 63,641 49,616
Postretirement benefits 24,666 30,564
Intangible assets 419 6,096
Other 48,262 50,554
Gross deferred income tax assets 560,698 770,100
Intangible assets (196,012) (175,921)
Other (15,782) 0
Gross deferred income tax liabilities (211,794) (175,921)
Deferred income tax asset valuation allowances (365,820) (580,937)
Net deferred income tax (liabilities) $ (16,916)  
Net deferred income tax assets   $ 13,242