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Income Taxes - Deferred Income Tax Assets (Liabilities) (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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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

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