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Beginning Balance, Annual Activity and Ending Balance of Accumulated Other Comprehensive Loss (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
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	$ 333,848	$ 329,118	$ 329,230	$ 320,231	$ 314,158	$ 305,314	$ 329,230	$ 305,314
FX translation	(1,080)	657	(1,769)	638	(898)	672	(2,192)	412
Balance	337,986	333,848	329,118	$ 328,624	$ 320,231	$ 314,158	337,986	$ 328,624
Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance	(5,619)	(6,276)	(4,507)				(4,507)
FX translation	(1,080)	657	(1,769)
Balance	$ (6,699)	$ (5,619)	$ (6,276)				$ (6,699)

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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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