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Stockholders' Equity - Tax Effects Related to the Change in Each Component of Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Equity [Abstract]
Unrealized gains (losses) on available-for-sale securities, Before-Tax Amount	$ (111)	$ 2,003	$ (458)	$ 4,659
Unrealized gains (losses) on available-for-sale securities, Tax (Expense) Benefit	29	(781)	119	(1,817)
Unrealized gains (losses) on available-for-sale securities, Net-of-Tax Amount	(82)	1,222	(339)	2,842
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	251	(1,391)	324	(1,860)
Reclassification adjustment for amounts related to available-for-sale investments included in net income, Tax (Expense) Benefit	(65)	542	(73)	726
Reclassification adjustment for amounts related to available-for-sale investments included in net income, Net-of-Tax Amount	186	(849)	251	(1,134)
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		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	7	124	97	204
Reclassification adjustment for amounts related to defined benefit plan adjustments included in net income, Tax (Expense) Benefit	(2)	(38)	(30)	(63)
Reclassification adjustment for amounts related to defined benefit plan adjustments included in net income, Net-of-Tax Amount	5	86	67	141
Foreign currency translation adjustment, Before-Tax Amount	(3,424)	2,619	(2,582)	3,861
Foreign currency translation adjustment, Net-of-Tax Amount	(3,424)	2,619	(2,582)	3,861
Total Other Comprehensive Income (Loss), Before-Tax Amount	(3,277)	2,938	(5,839)	6,526
Total Other Comprehensive Income (Loss), Tax (Expense) Benefit	(38)	(277)	16	(1,154)
Other Comprehensive Income (Loss), net of tax	$ (3,315)	$ 2,661	$ (5,823)	$ 5,372

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