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Reclassifications Out of Accumulated Other Comprehensive Income (Loss) to Statements of Operations (Detail) - USD ($)
$ in Thousands
 12 Months Ended
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