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Segment and Geographic Information - Geographic Information Regarding Revenues (Detail) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Revenues: |  |
Total revenues | $ 956,646 | $ 783,193
United States [Member] |  |
Revenues: |  |
Total revenues | 572,254 | 461,686
United Kingdom [Member] |  |
Revenues: |  |
Total revenues | 223,559 | 186,810
Asia [Member] |  |
Revenues: |  |
Total revenues | 69,029 | 61,109
Other Europe/MEA [Member] |  |
Revenues: |  |
Total revenues | 53,672 | 34,002
France [Member] |  |
Revenues: |  |
Total revenues | 23,018 | 25,265
Other Americas [Member] |  |
Revenues: |  |
Total revenues | $ 15,114 | $ 14,321

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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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