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Income Taxes - Schedule of Changes in Balance of Gross Unrecognized Tax Benefits (Detail) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2019
Income Tax Contingency [Line Items]
Beginning balance	$ 30,877	$ 31,593	$ 34,876	$ 34,876
Decrease—Lapse of statute of limitations			(4,309)	(4,309)
Increases	102	101	101
Foreign currency translation	(994)	(817)	925
Ending balance	29,985	30,877	31,593	29,985
Unrecognized Tax Benefits [Member]
Income Tax Contingency [Line Items]
Beginning balance	25,179	25,847	28,101	28,101
Decrease—Lapse of statute of limitations			(2,999)
Foreign currency translation	(810)	(668)	745
Ending balance	24,369	25,179	25,847	24,369
Interest And Penalties [Member]
Income Tax Contingency [Line Items]
Beginning balance	5,698	5,746	6,775	6,775
Decrease—Lapse of statute of limitations			(1,310)
Increases	102	101	101
Foreign currency translation	(184)	(149)	180
Ending balance	$ 5,616	$ 5,698	$ 5,746	$ 5,616

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Amount of decrease in unrecognized tax benefits resulting from lapses of applicable statutes of limitations.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15A
-Subparagraph (a)(4)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319

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Accrued for unrecognized tax benefits and interest/penalties related to a tax position claimed or expected to be claimed on a tax return.

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Amount of increase in unrecognized tax benefits and interest/penalties resulting from tax positions that have been or will be taken in current period tax return.

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Amount of increase in unrecognized tax benefits and interest/penalties resulting from foreign currency translation." through out the disclosure as per the table structure.

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