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Schedule of Tax Effects Allocated to Each Component of Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018
Components Of Other Comprehensive Income Loss [Line Items]
Foreign currency translation adjustment	$ 5,297		$ (5,046)		$ 10,302	$ (11,691)
Unrealized (loss) gain on cash flow hedging instruments	(709)		520		(1,444)	727
Income tax benefit (expense)	192		(140)		391	(196)
Unrealized (loss) gain on cash flow hedging instruments, net of tax	(517)		380		(1,053)	531
Reclassification of (gain) loss on cash flow hedging instruments into earnings	(176)		144		(551)	1,175
Income tax expense (benefit)	48		(39)		149	(317)
Reclassification of (gain) loss on cash flow hedging instruments into earnings, net of tax	(128)		105		(402)	858
Other comprehensive income (loss)	$ 4,652	$ 4,195	$ (4,561)	$ (5,741)	$ 8,847	$ (10,302)

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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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