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Schedule of Tax Effects Allocated to Each Component of Other Comprehensive (Loss) Income (Detail) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2019	Sep. 30, 2018
Components Of Other Comprehensive Income Loss [Line Items]
Foreign currency translation adjustment	$ (3,038)			$ 4,269			$ 7,264	$ (7,422)
Unrealized gain (loss) on cash flow hedging instruments	351			316			(1,093)	1,043
Income tax (expense) benefit	(96)			(85)			295	(281)
Unrealized gain (loss) on cash flow hedging instruments, net of tax	255			231			(798)	762
Reclassification of gain on cash flow hedging instruments into earnings	(191)			(1,253)			(742)	(78)
Income tax expense	51			338			200	21
Reclassification of gain on cash flow hedging instruments into earnings, net of tax	(140)			(915)			(542)	(57)
Other comprehensive (loss) income	$ (2,923)	$ 4,652	$ 4,195	$ 3,585	$ (4,561)	$ (5,741)	$ 5,924	$ (6,717)

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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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