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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, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Segment Reporting Information [Line Items]
Total revenues	$ 561,111	$ 482,694	$ 1,690,486	$ 1,508,641
Rates
Segment Reporting Information [Line Items]
Total revenues	174,313	145,703	515,442	454,649
ECS
Segment Reporting Information [Line Items]
Total revenues	112,921	93,120	349,128	281,467
FX
Segment Reporting Information [Line Items]
Total revenues	92,076	79,795	265,045	237,480
Credit
Segment Reporting Information [Line Items]
Total revenues	68,000	63,747	224,973	219,102
Equities
Segment Reporting Information [Line Items]
Total revenues	53,336	52,665	167,599	178,152
Total brokerage revenues
Segment Reporting Information [Line Items]
Total revenues	500,646	435,030	1,522,187	1,370,850
All other revenues
Segment Reporting Information [Line Items]
Total revenues	$ 60,465	$ 47,664	$ 168,299	$ 137,791

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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