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Changes in Accumulated Other Comprehensive Income (Loss) (Parenthetical) (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Amounts reclassified from accumulated other comprehensive income (loss), tax $ (235) $ (92) $ (451)
Reclassification of unrealized gains on equity securities, net of tax (192) (21) (297)
Foreign currency translation adjustments, tax 0 0 0
Unrealized (losses) gains on marketable securities, tax 946 (521) 1,815
Retirement plans prior service benefit, tax (1,124) (1,081) (932)
Foreign Currency Translation Reclassification Adjustments      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Other comprehensive income (loss) before reclassifications, tax 0 0  
Amounts reclassified from accumulated other comprehensive income (loss), tax 0 0  
Other comprehensive income (loss), tax 0 0  
Reclassification of income tax effects from the Tax Reform Act, net of tax   0  
Unrealized (Losses) Gains on Marketable Securities      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Other comprehensive income (loss) before reclassifications, tax 1,659 (722)  
Amounts reclassified from accumulated other comprehensive income (loss), tax (192) (21) (297)
Other comprehensive income (loss), tax 1,467 (743)  
Reclassification of income tax effects from the Tax Reform Act, net of tax   (691)  
Amortization of Prior Service Credit      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Other comprehensive income (loss) before reclassifications, tax 0 0  
Amounts reclassified from accumulated other comprehensive income (loss), tax (43) (71) $ (154)
Other comprehensive income (loss), tax $ (43) (71)  
Reclassification of income tax effects from the Tax Reform Act, net of tax   (78)  
ASU 2016-01 | Foreign Currency Translation Reclassification Adjustments      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Reclassification of unrealized gains on equity securities, net of tax   0  
ASU 2016-01 | Unrealized (Losses) Gains on Marketable Securities      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Reclassification of unrealized gains on equity securities, net of tax   (902)  
ASU 2016-01 | Amortization of Prior Service Credit      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Reclassification of unrealized gains on equity securities, net of tax   $ 0