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Reclassifications Out of Accumulated Other Comprehensive Income to Statements of Operations (Parenthetical) (Detail) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2019 | Apr. 01, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Reclassifications, tax | $ 31 | $ (60)
Unrealized (Losses) Gains on Marketable Securities |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Reclassifications, tax | (20) | (78)
Amortization of Prior Service Credit |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Reclassifications, tax | $ (11) | $ (18)

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