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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