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Income Taxes - Deferred Income Tax Assets (Liabilities) (Detail) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
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Income Tax Disclosure [Abstract] |  |
Research and development expenses | $ 191,057 | $ 189,694
Loss carryforwards | 150,270 | 172,347
Deferred compensation | 211,538 | 233,434
Tax credit carryforwards | 98,832 | 91,530
Deferred Tax Assets, Tax Credit Carryforwards, Other | 50,309 | 54,674
Postretirement benefits | 48,648 | 50,235
Intangible assets | 14,035 | 30,803
Other | 71,453 | 68,604
Gross deferred income tax assets | 836,142 | 891,321
Intangible assets | (305,818) | (298,444)
Other | (2,905) | (3,868)
Gross deferred income tax liabilities | (308,723) | (302,312)
Deferred income tax asset valuation allowances | (77,334) | (133,297)
Net deferred income tax assets | $ 450,085 | $ 455,712

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