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Schedule of Tax Effects Allocated to 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
Components Of Other Comprehensive Income Loss [Line Items]
Foreign currency translation adjustment	$ 4,269	$ 9,385	$ (7,422)	$ 17,310
Unrealized gain (loss) on cash flow hedging instruments	316	(1,280)	1,043	(1,399)
Income tax (expense) benefit	(85)	346	(281)	378
Unrealized gain (loss) on cash flow hedging instruments, net of tax	231	(934)	762	(1,021)
Reclassification of (gain) loss on cash flow hedging instruments into earnings	(1,253)	88	(78)	(1,092)
Income tax expense (benefit)	338	(24)	21	295
Reclassification of (gain) loss on cash flow hedging instruments into earnings, net of tax	(915)	64	(57)	(797)
Unrealized gain on equity securities		20		25
Income tax expense		(7)		(9)
Unrealized gain on equity securities, net of tax		13		16
Other comprehensive income (loss)	$ 3,585	$ 8,528	$ (6,717)	$ 15,508

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Amount after tax and reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.

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