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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, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2020	Sep. 30, 2019
Components Of Other Comprehensive Income Loss [Line Items]
Foreign currency translation adjustment	$ 5,514			$ (3,038)			$ (6,592)	$ 7,264
Unrealized (loss) gain on cash flow hedging instruments	(570)			351			1,297	(1,093)
Income tax benefit (expense)	154			(96)			(349)	295
Unrealized (loss) gain on cash flow hedging instruments, net of tax	(416)			255			948	(798)
Reclassification of gain on cash flow hedging instruments into earnings	(697)			(191)			(946)	(742)
Income tax expense	188			51			255	200
Reclassification of gain on cash flow hedging instruments into earnings, net of tax	(509)			(140)			(691)	(542)
Other comprehensive income (loss)	$ 4,589	$ 8,356	$ (19,280)	$ (2,923)	$ 4,652	$ 4,195	$ (6,335)	$ 5,924

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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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