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Goodwill and Intangible Assets - Summary of Goodwill by Reporting Unit (Detail) $ in Thousands	6 Months Ended
	Jun. 30, 2018 USD ($)
Goodwill [Line Items]
Beginning balance	$ 1,799
Increases/(decreases)	84,057
Ending balance	85,856
Reportable Subsegments [Member] | European Business Segment [Member]
Goodwill [Line Items]
Increases/(decreases)	84,057
Ending balance	84,057
Reportable Subsegments [Member] | U.S. Business segment [Member]
Goodwill [Line Items]
Beginning balance	1,799
Ending balance	$ 1,799

X

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975

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+ References

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-Section 50
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