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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 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Equity [Abstract]        
Unrealized gains (losses) on available-for-sale securities, Before-Tax Amount $ 2,003 $ 789 $ 4,659 $ 2,031
Unrealized gains (losses) on available-for-sale securities, Tax (Expense) Benefit (781) (308) (1,817) (792)
Unrealized gains (losses) on available-for-sale securities, Net-of-Tax Amount 1,222 481 2,842 1,239
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 (1,391) (1,059) (1,860) (2,720)
Reclassification adjustment for amounts related to available-for-sale investments included in net income, Tax (Expense) Benefit 542 413 726 1,061
Reclassification adjustment for amounts related to available-for-sale investments included in net income, Net-of-Tax Amount (849) (646) (1,134) (1,659)
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 124 33 204 98
Reclassification adjustment for amounts related to defined benefit plan adjustments included in net income, Tax (Expense) Benefit (38) (11) (63) (31)
Reclassification adjustment for amounts related to defined benefit plan adjustments included in net income, Net-of-Tax Amount 86 22 141 67
Foreign currency translation adjustment, Before-Tax Amount 2,619 (601) 3,861 627
Foreign currency translation adjustment, Net-of-Tax Amount 2,619 (601) 3,861 627
Total Other Comprehensive Income (Loss), Before-Tax Amount 2,938 (838) 6,526 36
Total Other Comprehensive Income (Loss), Tax (Expense) Benefit (277) 94 (1,154) 238
Other Comprehensive Income (Loss), net of tax $ 2,661 $ (744) $ 5,372 $ 274