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Reclassifications Out of Accumulated Other Comprehensive Income (Loss) to Statements of Operations (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Interest income (expense) | $ (301) | $ 995 | $ 2,365
Unrealized Gains on Marketable Securities |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Interest income (expense) | (301) | 995 | 2,365
Reclassifications, net of tax | (301) | 995 |
Amortization of Prior Service Credit |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Reclassifications, net of tax | 7 | 7 | 7
Accumulated Other Comprehensive Income (Loss) |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Reclassifications, net of tax | $ (294) | $ 1,002 | $ 2,372

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