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Segments - Summary of Geographic Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 6,458,613	$ 5,381,384	$ 12,397,492	$ 11,270,552
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	3,563,704	3,089,794	6,912,563	6,470,357
United Kingdom
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	832,938	677,880	1,609,981	1,451,895
All other countries
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 2,061,971	$ 1,613,710	$ 3,874,948	$ 3,348,300

X

- 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).

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