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Income Taxes - Deferred Income Tax Assets (Liabilities) (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Income Tax Disclosure [Abstract] |  |
Tax credit carryforwards | $ 71,428 | $ 59,640
Research and development expenses | 41,862 | 58,340
Net operating loss carryforwards | 161,846 | 153,866
Interest expense | 108,069 | 80,774
Allowances and reserves | 92,372 | 100,896
Deferred compensation | 60,665 | 67,689
Postretirement benefits | 38,182 | 33,839
Intangible assets | 231,527 | 245,138
Lease liabilities | 74,600 | 77,948
Other | 42,058 | 33,619
Gross deferred income tax assets | 922,609 | 911,749
Intangible assets | (187,001) | (190,677)
Right-of-use assets | (66,404) | (68,082)
Other | (25,500) | (31,024)
Gross deferred income tax liabilities | (278,905) | (289,783)
Deferred income tax asset valuation allowances | (631,914) | (610,560)
Net deferred income tax assets | $ 11,790 | $ 11,406

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