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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, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Equity [Abstract] |  |  |  |
Unrealized gains (losses) on available-for-sale securities, Before-Tax Amount | $ (111) | $ 2,003 | $ (458) | $ 4,659
Unrealized gains (losses) on available-for-sale securities, Tax (Expense) Benefit | 29 | (781) | 119 | (1,817)
Unrealized gains (losses) on available-for-sale securities, Net-of-Tax Amount | (82) | 1,222 | (339) | 2,842
Unrealized gains (losses) on cash flow hedges, Before-Tax Amount |  | (571) |  | (492)
Unrealized gains (losses) on cash flow hedges, Net-of-Tax Amount |  | (571) |  | (492)
Reclassification adjustment for amounts related to available-for-sale investments included in net income, Before-Tax Amount | 251 | (1,391) | 324 | (1,860)
Reclassification adjustment for amounts related to available-for-sale investments included in net income, Tax (Expense) Benefit | (65) | 542 | (73) | 726
Reclassification adjustment for amounts related to available-for-sale investments included in net income, Net-of-Tax Amount | 186 | (849) | 251 | (1,134)
Reclassification adjustment for amounts reclassed to retained earnings related to the adoption of ASU 2016-01, Before-Tax Amount |  |  | (3,220) |
Reclassification adjustment for amounts reclassed to retained earnings related to the adoption of ASU 2016-01, Net-of-Tax Amount |  |  | (3,220) |
Reclassification adjustment for amounts related to cash flow hedges included in net income, Before-Tax Amount |  | 154 |  | 154
Reclassification adjustment for amounts related to cash flow hedges included in net income, Net-of-Tax Amount |  | 154 |  | 154
Reclassification adjustment for amounts related to defined benefit plan adjustments included in net income, Before-Tax Amount | 7 | 124 | 97 | 204
Reclassification adjustment for amounts related to defined benefit plan adjustments included in net income, Tax (Expense) Benefit | (2) | (38) | (30) | (63)
Reclassification adjustment for amounts related to defined benefit plan adjustments included in net income, Net-of-Tax Amount | 5 | 86 | 67 | 141
Foreign currency translation adjustment, Before-Tax Amount | (3,424) | 2,619 | (2,582) | 3,861
Foreign currency translation adjustment, Net-of-Tax Amount | (3,424) | 2,619 | (2,582) | 3,861
Total Other Comprehensive Income (Loss), Before-Tax Amount | (3,277) | 2,938 | (5,839) | 6,526
Total Other Comprehensive Income (Loss), Tax (Expense) Benefit | (38) | (277) | 16 | (1,154)
Other Comprehensive Income (Loss), net of tax | $ (3,315) | $ 2,661 | $ (5,823) | $ 5,372

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