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Segments - Summary of Geographic Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Revenues From External Customers And Long Lived Assets [Line Items]
Revenue	$ 5,645,142	$ 5,925,101	$ 16,915,694	$ 16,774,684
United States [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Revenue	3,162,235	3,442,570	9,632,592	9,851,477
United Kingdom [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Revenue	736,927	758,084	2,188,822	2,003,671
All other countries [Member]
Revenues From External Customers And Long Lived Assets [Line Items]
Revenue	$ 1,745,980	$ 1,724,447	$ 5,094,280	$ 4,919,536

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).

+ References

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