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Income Taxes - Deferred Income Tax Assets (Liabilities) (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Income Tax Disclosure [Abstract]    
Tax credit carryforwards $ 222,353 $ 59,426
Allowances and reserves 176,248 204,661
Net operating loss carryforwards 139,544 165,522
Research and development expenses 92,443 193,908
Deferred compensation 49,616 78,245
Postretirement benefits 30,564 47,732
Intangible assets 6,096 9,160
Other 50,554 62,057
Gross deferred income tax assets 767,418 820,711
Intangible assets (175,921) (295,968)
Gross deferred income tax liabilities (175,921) (295,968)
Deferred income tax asset valuation allowances (579,245) (74,125)
Net deferred income tax assets $ 12,252 $ 450,618