Stockholders' Equity - Tax Effects Related to the Change in Each Component of Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Equity [Abstract]
Unrealized gains (losses) on available-for-sale securities, Before-Tax Amount	$ 1,632	$ 2,328	$ 1,174	$ 6,987
Unrealized gains (losses) on available-for-sale securities, Tax (Expense) Benefit	(424)	(908)	(305)	(2,725)
Unrealized gains (losses) on available-for-sale securities, Net-of-Tax Amount	1,208	1,420	869	4,262
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	(1,676)	(1,009)	(1,352)	(2,869)
Reclassification adjustment for amounts related to available-for-sale investments included in net income, Tax (Expense) Benefit	436	393	363	1,119
Reclassification adjustment for amounts related to available-for-sale investments included in net income, Net-of-Tax Amount	(1,240)	(616)	(989)	(1,750)
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 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	54	106	151	310
Reclassification adjustment for amounts related to defined benefit plan adjustments included in net income, Tax (Expense) Benefit	(17)	(33)	(47)	(96)
Reclassification adjustment for amounts related to defined benefit plan adjustments included in net income, Net-of-Tax Amount	37	73	104	214
Foreign currency translation adjustment, Before-Tax Amount	(451)	1,541	(3,033)	5,402
Foreign currency translation adjustment, Net-of-Tax Amount	(451)	1,541	(3,033)	5,402
Total Other Comprehensive Income (Loss), Before-Tax Amount	(441)	3,167	(6,280)	9,472
Total Other Comprehensive Income (Loss), Tax (Expense) Benefit	(5)	(607)	11	(1,540)
Other Comprehensive Income (Loss), net of tax	$ (446)	$ 2,560	$ (6,269)	$ 7,932

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