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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
Mar. 31, 2018
Mar. 31, 2017
Equity [Abstract]    
Unrealized gains (losses) on available-for-sale securities, Before-Tax Amount $ (347) $ 2,656
Unrealized gains (losses) on available-for-sale securities, Tax (Expense) Benefit 90 (1,036)
Unrealized gains (losses) on available-for-sale securities, Net-of-Tax Amount (257) 1,620
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 73 (469)
Reclassification adjustment for amounts related to available-for-sale investments included in net income, Tax (Expense) Benefit (8) 184
Reclassification adjustment for amounts related to available-for-sale investments included in net income, Net-of-Tax Amount 65 (285)
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 defined benefit plan adjustments included in net income, Before-Tax Amount 90 80
Reclassification adjustment for amounts related to defined benefit plan adjustments included in net income, Tax (Expense) Benefit (28) (25)
Reclassification adjustment for amounts related to defined benefit plan adjustments included in net income, Net-of-Tax Amount 62 55
Foreign currency translation adjustment, Before-Tax Amount 842 1,242
Foreign currency translation adjustment, Net-of-Tax Amount 842 1,242
Total Other Comprehensive Income (Loss), Before-Tax Amount (2,562) 3,588
Total Other Comprehensive Income (Loss), Tax (Expense) Benefit 54 (877)
Other Comprehensive Income (Loss), net of tax $ (2,508) $ 2,711