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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
	Mar. 31, 2019	Mar. 31, 2018
Equity [Abstract]
Unrealized gains (losses) on available-for-sale securities, Before-Tax Amount	$ 312	$ (347)
Unrealized gains (losses) on available-for-sale securities, Tax (Expense) Benefit	(81)	90
Unrealized gains (losses) on available-for-sale securities, Net-of-Tax Amount	231	(257)
Reclassification adjustment for amounts related to available-for-sale investments included in net income, Before-Tax Amount	(62)	73
Reclassification adjustment for amounts related to available-for-sale investments included in net income, Tax (Expense) Benefit	16	(8)
Reclassification adjustment for amounts related to available-for-sale investments included in net income, Net-of-Tax Amount	(46)	65
Reclassification adjustment for amounts related to cash flow hedges included in net income, Before-Tax Amount		(3,220)
Reclassification adjustment for amounts related to cash flow hedges included in net income, Net-of-Tax Amount		(3,220)
Reclassification adjustment for amounts related to defined benefit plan adjustments included in net income, Before-Tax Amount	175	90
Reclassification adjustment for amounts related to defined benefit plan adjustments included in net income, Tax (Expense) Benefit	(54)	(28)
Reclassification adjustment for amounts related to defined benefit plan adjustments included in net income, Net-of-Tax Amount	121	62
Foreign currency translation adjustment, Before-Tax Amount	(1,160)	842
Foreign currency translation adjustment, Net-of-Tax Amount	(1,160)	842
Total Other Comprehensive Income (Loss), Before-Tax Amount	(735)	(2,562)
Total Other Comprehensive Income (Loss), Tax (Expense) Benefit	(119)	54
Other Comprehensive Loss, net of tax	$ (854)	$ (2,508)

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