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Income Taxes - Deferred Income Tax Assets (Liabilities) (Detail) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
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Income Tax Disclosure [Abstract] |  |
Allowances and reserves | $ 204,661 | $ 211,538
Research and development expenses | 193,908 | 191,057
Loss carryforwards | 165,522 | 150,270
Deferred compensation | 78,245 | 98,832
Tax credit carryforwards | 59,426 | 50,309
Postretirement benefits | 47,732 | 48,648
Intangible assets | 9,160 | 14,035
Other | 62,057 | 71,453
Gross deferred income tax assets | 820,711 | 836,142
Intangible assets | (295,968) | (305,818)
Other | 0 | (2,905)
Gross deferred income tax liabilities | (295,968) | (308,723)
Deferred income tax asset valuation allowances | (74,125) | (77,334)
Net deferred income tax assets | $ 450,618 | $ 450,085

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