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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Mar. 31, 2021 | Jun. 30, 2020 | Mar. 31, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Equity [Abstract] |  |  |  |  |  |
Unrealized gain (loss) on available-for-sale securities, Before-Tax Amount | $ (358) |  | $ 1,191 |  | $ (433) | $ (68)
Unrealized gain (loss) on available-for-sale securities, Tax (Expense) Benefit | 86 |  | (310) |  | 104 | 18
Unrealized gain (loss) on available-for-sale securities, Net-of-Tax Amount | (272) |  | 881 |  | (329) | (50)
Reclassification adjustment for amounts related to available-for-sale investments included in net income (loss), Before-Tax Amount | 233 |  | (686) |  | 55 | 730
Reclassification adjustment for amounts related to available-for-sale investments included in net income (loss), Tax (Expense) Benefit | (56) |  | 178 |  | (13) | (190)
Reclassification adjustment for amounts related to available-for-sale investments included in net income (loss), Net-of-Tax Amount | 177 |  | (508) |  | 42 | 540
Reclassification adjustment for amounts related to defined benefit plan adjustments included in net income (loss), Before-Tax Amount | 307 |  | 277 |  | 451 | 481
Reclassification adjustment for amounts related to defined benefit plan adjustments included in net income (loss), Tax (Expense) Benefit | (95) |  | (86) |  | (140) | (149)
Reclassification adjustment for amounts related to defined benefit plan adjustments included in net income (loss), Net-of-Tax Amount | 212 |  | 191 |  | 311 | 332
Foreign currency translation adjustment, Before-Tax Amount | 338 |  | 1,899 |  | (1,525) | 249
Foreign currency translation adjustment, Net-of-Tax Amount | 338 |  | 1,899 |  | (1,525) | 249
Total Other Comprehensive Income (Loss), Before-Tax Amount | 520 |  | 2,681 |  | (1,452) | 1,392
Total Other Comprehensive Income (Loss), Tax (Expense) Benefit | (65) |  | (218) |  | (49) | (321)
Other Comprehensive Income (Loss), net of tax | $ 455 | $ (1,956) | $ 2,463 | $ (1,392) | $ (1,501) | $ 1,071

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