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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 + Details
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