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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