Income Taxes - Changes in Valuation Allowance for Deferred Tax Assets (Detail) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning balance	$ 29,167	$ 29,894	$ 27,181
Amounts from acquisitions	25,283	5,053	0
Amounts recognized into income	716	(11,995)	(710)
Current increase	28,431	6,557	4,513
Impact of foreign currency exchange	(976)	342	1,090
Ending balance	$ 84,573	$ 29,167	$ 29,894

Deferred Tax Assets, Valuation Allowance, Amounts From Acquisitions

No definition available.

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- Definition

Deferred Tax Assets Valuation Allowance Foreign Currency Translation Adjustments

+ References

No definition available.

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- Definition

Release of valuation allowance against income.

+ References

No definition available.

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- Definition

Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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- Definition

Amount of increase (decrease) in the valuation allowance for a specified deferred tax asset.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 45
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=84176650&loc=d3e32123-109318

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