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Segment Reporting - Revenue by Geographic Area (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Revenue by geographic area
Total revenue	$ 95,466	$ 152,928	$ 34,589	$ 24,728	$ 37,450	$ 36,336	$ 32,768	$ 58,882	$ 307,711	$ 165,436	$ 230,784
United States [Member] | Reportable Geographical Components [Member]
Revenue by geographic area
Total revenue									190,810	39,147	40,400
European [Member] | Reportable Geographical Components [Member]
Revenue by geographic area
Total revenue									$ 116,901	$ 126,289	$ 190,384

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- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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