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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, 2019 | Mar. 31, 2019 | Jun. 30, 2018 | Mar. 31, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Equity [Abstract] |  |  |  |  |  |
Unrealized gains (losses) on available-for-sale securities, Before-Tax Amount | $ 243 |  | $ (111) |  | $ 555 | $ (458)
Unrealized gains (losses) on available-for-sale securities, Tax (Expense) Benefit | (63) |  | 29 |  | (144) | 119
Unrealized gains (losses) on available-for-sale securities, Net-of-Tax Amount | 180 |  | (82) |  | 411 | (339)
Reclassification adjustment for amounts related to available-for-sale investments included in net income (loss), Before-Tax Amount | (99) |  | 251 |  | (161) | 324
Reclassification adjustment for amounts related to available-for-sale investments included in net income (loss), Tax (Expense) Benefit | 26 |  | (65) |  | 42 | (73)
Reclassification adjustment for amounts related to available-for-sale investments included in net income (loss), Net-of-Tax Amount | (73) |  | 186 |  | (119) | 251
Reclassification adjustment for amounts reclassed to retained earnings related of the adoption of ASU 2016-01, Before-Tax Amount |  |  |  |  |  | (3,220)
Reclassification adjustment for amounts reclassed to retained earnings related of the adoption of ASU 2016-01, Net-of-Tax Amount |  |  |  |  |  | (3,220)
Reclassification adjustment for amounts related to defined benefit plan adjustments included in net income (loss), Before-Tax Amount | 217 |  | 7 |  | 393 | 97
Reclassification adjustment for amounts related to defined benefit plan adjustments included in net income (loss), Tax (Expense) Benefit | (67) |  | (2) |  | (122) | (30)
Reclassification adjustment for amounts related to defined benefit plan adjustments included in net income (loss), Net-of-Tax Amount | 150 |  | 5 |  | 271 | 67
Foreign currency translation adjustment, Before-Tax Amount | 533 |  | (3,424) |  | (627) | (2,582)
Foreign currency translation adjustment, Net-of-Tax Amount | 533 |  | (3,424) |  | (627) | (2,582)
Total Other Comprehensive Income (Loss), Before-Tax Amount | 894 |  | (3,277) |  | 160 | (5,839)
Total Other Comprehensive Income (Loss), Tax (Expense) Benefit | (104) |  | (38) |  | (224) | 16
Other Comprehensive Income (Loss), net of tax | $ 790 | $ (854) | $ (3,315) | $ (2,508) | $ (64) | $ (5,823)

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