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Stockholders' Equity - Tax Effects Related to the Change in Each Component of Other Comprehensive Income (Loss) (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2020
Sep. 30, 2019
Equity [Abstract]                
Unrealized gain (loss) on available-for-sale securities, Before-Tax Amount $ 668     $ (53)     $ 600 $ 503
Unrealized gain (loss) on available-for-sale securities, Tax (Expense) Benefit (174)     14     (156) (131)
Unrealized gain (loss) on available-for-sale securities, Net-of-Tax Amount 494     (39)     444 372
Reclassification adjustment for amounts related to available-for-sale investments included in net income (loss), Before-Tax Amount (728)     32     1 (128)
Reclassification adjustment for amounts related to available-for-sale investments included in net income (loss), Tax (Expense) Benefit 189     (8)       33
Reclassification adjustment for amounts related to available-for-sale investments included in net income (loss), Net-of-Tax Amount (539)     24     1 (95)
Reclassification adjustment for amounts related to defined benefit plan adjustments included in net income (loss), Before-Tax Amount 354     130     835 523
Reclassification adjustment for amounts related to defined benefit plan adjustments included in net income (loss), Tax (Expense) Benefit (110)     (40)     (259) (162)
Reclassification adjustment for amounts related to defined benefit plan adjustments included in net income (loss), Net-of-Tax Amount 244     90     576 361
Foreign currency translation adjustment, Before-Tax Amount 2,469     (2,486)     2,718 (3,113)
Foreign currency translation adjustment, Net-of-Tax Amount 2,469     (2,486)     2,718 (3,113)
Total Other Comprehensive Income (Loss), Before-Tax Amount 2,763     (2,377)     4,154 (2,215)
Total Other Comprehensive Income (Loss), Tax (Expense) Benefit (95)     (34)     (415) (260)
Other Comprehensive Income (Loss), net of tax $ 2,668 $ 2,463 $ (1,392) $ (2,411) $ 790 $ (854) $ 3,739 $ (2,475)