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Beginning Balance, Annual Activity and Ending Balance of Foreign Currency Translation Adjustment Included as Component of Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	$ 369,371	$ 360,046	$ 360,736				$ 360,736
FX translation	(3,459)	2,914	(2,503)	$ (83)			(3,048)	$ (8,822)
Balance	368,341	369,371	360,046				368,341
Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(8,911)	(11,825)	(9,322)	(14,437)	$ (14,761)	$ (5,698)	(9,322)	(5,698)
FX translation	(3,459)	2,914	(2,503)	(83)	324	(9,063)
Balance	$ (12,370)	$ (8,911)	$ (11,825)	$ (14,520)	$ (14,437)	$ (14,761)	$ (12,370)	$ (14,520)

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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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Amount of stockholders' equity (deficit), net of receivables from officers, directors, owners, and affiliates of the entity, attributable to both the parent and noncontrolling interests. Amount excludes temporary equity. Alternate caption for the concept is permanent equity.

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