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Segment, Geographic and Product Information - Product Information Regarding Revenues (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Segment Reporting Information [Line Items]
Total revenues	$ 482,694	$ 416,567	$ 1,508,641	$ 1,358,787
Rates
Segment Reporting Information [Line Items]
Total revenues	145,703	129,971	454,649	425,909
Energy and Commodities
Segment Reporting Information [Line Items]
Total revenues	93,120	68,975	237,480	227,853
FX
Segment Reporting Information [Line Items]
Total revenues	79,795	73,481	219,102	203,352
Credit
Segment Reporting Information [Line Items]
Total revenues	63,747	58,187	281,467	218,057
Equities
Segment Reporting Information [Line Items]
Total revenues	52,665	48,384	178,152	173,803
Total brokerage revenues
Segment Reporting Information [Line Items]
Total revenues	435,030	378,998	1,370,850	1,248,974
All other revenues
Segment Reporting Information [Line Items]
Total revenues	$ 47,664	$ 37,569	$ 137,791	$ 109,813

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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