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Stockholders' Equity - Tax Effects Related to the Change in Each Component of Other Comprehensive Income (Detail) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2017 | Mar. 31, 2016
Equity [Abstract] |  |
Unrealized gains (losses) on available-for-sale securities, Before-Tax Amount | $ 2,656 | $ 1,244
Unrealized gains (losses) on available-for-sale securities, Tax (Expense) Benefit | (1,036) | (486)
Unrealized gains (losses) on available-for-sale securities, Net-of-Tax Amount | 1,620 | 758
Unrealized gains (losses) on cash flow hedges, Before-Tax Amount | 79 |
Unrealized gains (losses) on cash flow hedges, Net-of-Tax Amount | 79 |
Reclassification adjustment for amounts related to available-for-sale investments included in net income, Before-Tax Amount | (469) | (1,661)
Reclassification adjustment for amounts related to available-for-sale investments included in net income, Tax (Expense) Benefit | 184 | 648
Reclassification adjustment for amounts related to available-for-sale investments included in net income, Net-of-Tax Amount | (285) | (1,013)
Reclassification adjustment for amounts related to defined benefit plan adjustments included in net income, Before-Tax Amount | 80 | 65
Reclassification adjustment for amounts related to defined benefit plan adjustments included in net income, Tax (Expense) Benefit | (25) | (20)
Reclassification adjustment for amounts related to defined benefit plan adjustments included in net income, Net-of-Tax Amount | 55 | 45
Foreign currency translation adjustment, Before-Tax Amount | 1,242 | 1,228
Foreign currency translation adjustment, Net-of-Tax Amount | 1,242 | 1,228
Total Other Comprehensive Income (Loss), Before-Tax Amount | 3,588 | 876
Total Other Comprehensive Income (Loss), Tax (Expense) Benefit | (877) | 142
Other Comprehensive Income, net of tax | $ 2,711 | $ 1,018

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