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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 | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Equity [Abstract] |  |  |  |
Unrealized gains (losses) on available-for-sale securities, Before-Tax Amount | $ 2,328 | $ 1,685 | $ 6,987 | $ 3,716
Unrealized gains (losses) on available-for-sale securities, Tax (Expense) Benefit | (908) | (657) | (2,725) | (1,449)
Unrealized gains (losses) on available-for-sale securities, Net-of-Tax Amount | 1,420 | 1,028 | 4,262 | 2,267
Unrealized gains (losses) on cash flow hedges, Before-Tax Amount | (184) |  | (897) |
Unrealized gains (losses) on cash flow hedges, Tax (Expense) Benefit | 57 |  | 278 |
Unrealized gains (losses) on cash flow hedges, Net-of-Tax Amount | (127) |  | (619) |
Reclassification adjustment for amounts related to available-for-sale investments included in net income, Before-Tax Amount | (1,009) | (1,262) | (2,869) | (3,982)
Reclassification adjustment for amounts related to available-for-sale investments included in net income, Tax (Expense) Benefit | 393 | 492 | 1,119 | 1,553
Reclassification adjustment for amounts related to available-for-sale investments included in net income, Net-of-Tax Amount | (616) | (770) | (1,750) | (2,429)
Reclassification adjustment for amounts related to cash flow hedges included in net income, Before-Tax Amount | 385 |  | 539 |
Reclassification adjustment for amounts related to cash flow hedges included in net income, Tax (Expense) Benefit | (116) |  | (116) |
Reclassification adjustment for amounts related to cash flow hedges included in net income, Net-of-Tax Amount | 269 |  | 423 |
Reclassification adjustment for amounts related to defined benefit plan adjustments included in net income, Before-Tax Amount | 106 | 51 | 310 | 149
Reclassification adjustment for amounts related to defined benefit plan adjustments included in net income, Tax (Expense) Benefit | (33) | (15) | (96) | (46)
Reclassification adjustment for amounts related to defined benefit plan adjustments included in net income, Net-of-Tax Amount | 73 | 36 | 214 | 103
Foreign currency translation adjustment, Before-Tax Amount | 1,541 | 575 | 5,402 | 1,202
Foreign currency translation adjustment, Net-of-Tax Amount | 1,541 | 575 | 5,402 | 1,202
Total Other Comprehensive Income (Loss), Before-Tax Amount | 3,167 | 1,049 | 9,472 | 1,085
Total Other Comprehensive Income (Loss), Tax (Expense) Benefit | (607) | (180) | (1,540) | 58
Other Comprehensive Income, net of tax | $ 2,560 | $ 869 | $ 7,932 | $ 1,143

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