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Segment Information - Additional Information (Detail) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2019 USD ($) Segment | Mar. 31, 2018 USD ($)
Segment Reporting Information [Line Items] |  |
Number of reportable segments | Segment | 4 |
Total revenues | $ 619,280 | $ 501,461
Document Period End Date | Mar. 31, 2019 |
London, Bermuda and Cayman Islands |  |
Segment Reporting Information [Line Items] |  |
Total revenues | $ 3,400 | $ 3,300

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- Definition The end date of the period reflected on the cover page if a periodic report. For all other reports and registration statements containing historical data, it is the date up through which that historical data is presented. If there is no historical data in the report, use the filing date. The format of the date is CCYY-MM-DD. + References No definition available. + Details
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- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. + References No definition available. + Details
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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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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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