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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, 2021
Jun. 30, 2021
Mar. 31, 2021
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Sep. 30, 2021
Sep. 30, 2020
Equity [Abstract]                
Unrealized gain (loss) on available-for-sale securities, Before-Tax Amount $ (38)     $ 668     $ (471) $ 600
Unrealized gain (loss) on available-for-sale securities, Tax (Expense) Benefit 9     (174)     113 (156)
Unrealized gain (loss) on available-for-sale securities, Net-of-Tax Amount (29)     494     (358) 444
Reclassification adjustment for amounts related to available-for-sale investments included in net income (loss), Before-Tax Amount (42)     (728)     13 1
Reclassification adjustment for amounts related to available-for-sale investments included in net income (loss), Tax (Expense) Benefit 10     189     (3)  
Reclassification adjustment for amounts related to available-for-sale investments included in net income (loss), Net-of-Tax Amount (32)     (539)     10 1
Reclassification adjustment for amounts related to defined benefit plan adjustments included in net income (loss), Before-Tax Amount 180     354     630 835
Reclassification adjustment for amounts related to defined benefit plan adjustments included in net income (loss), Tax (Expense) Benefit (56)     (110)     (195) (259)
Reclassification adjustment for amounts related to defined benefit plan adjustments included in net income (loss), Net-of-Tax Amount 124     244     435 576
Foreign currency translation adjustment, Before-Tax Amount (1,389)     2,469     (2,914) 2,718
Foreign currency translation adjustment, Net-of-Tax Amount (1,389)     2,469     (2,914) 2,718
Total Other Comprehensive Income (Loss), Before-Tax Amount (1,289)     2,763     (2,742) 4,154
Total Other Comprehensive Income (Loss), Tax (Expense) Benefit (37)     (95)     (85) (415)
Other Comprehensive Income (Loss), net of tax $ (1,326) $ 455 $ (1,956) $ 2,668 $ 2,463 $ (1,392) $ (2,827) $ 3,739