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Reclassifications Out of Accumulated Other Comprehensive Income to Statements of Operations (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Interest income (expense) | $ 2,365 | $ 690 | $ (1,337)
Amortization of Prior Service Credit |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Reclassifications, net of tax | 7 | 148 | 245
Accumulated Other Comprehensive Income (Loss) |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Reclassifications, net of tax | $ 2,372 | $ 838 | $ (1,092)

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