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Income Taxes - Deferred Income Tax Assets (Liabilities) (Detail) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Income Tax Disclosure [Abstract] |  |
Tax credit carryforwards | $ 59,640 | $ 64,895
Research and development expenses | 58,340 | 76,906
Net operating loss carryforwards | 234,640 | 187,741
Allowances and reserves | 100,896 | 94,168
Deferred compensation | 67,689 | 63,641
Postretirement benefits | 33,839 | 24,666
Intangible assets | 245,138 | 419
Other | 43,485 | 48,262
Gross deferred income tax assets | 843,667 | 560,698
Intangible assets | (190,677) | (196,012)
Other | (31,024) | (15,782)
Gross deferred income tax liabilities | (221,701) | (211,794)
Deferred income tax asset valuation allowances | (610,560) | (365,820)
Net deferred income tax assets | $ 11,406 |
Net deferred income tax liabilities |  | $ (16,916)

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