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Segments - Summary of Geographic Information (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 5,938,879	$ 5,889,168
United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	3,348,859	3,380,317
United Kingdom
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	777,044	737,515
All other countries
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 1,812,976	$ 1,771,336

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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).

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