Segment Information - Additional Information (Details) $ in Thousands	3 Months Ended
Mar. 31, 2021 USD ($) Segment	Mar. 31, 2020 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments \| Segment	4
Revenues	$ 815,276	$ 698,495
Bermuda, Cayman Islands, Ireland and London
Segment Reporting Information [Line Items]
Revenues	$ 17,500	$ 3,900

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).

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Reference 7: http://www.xbrl.org/2003/role/disclosureRef
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+ Details