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Segment, Geographic and Product Information - Product Information Regarding Revenues (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Segment Reporting Information [Line Items]    
Total revenues $ 578,614 $ 532,867
Rates    
Segment Reporting Information [Line Items]    
Total revenues 175,085 164,737
Energy, Commodities, and Shipping    
Segment Reporting Information [Line Items]    
Total revenues 118,464 89,659
FX    
Segment Reporting Information [Line Items]    
Total revenues 84,023 80,158
Credit    
Segment Reporting Information [Line Items]    
Total revenues 87,592 89,549
Equities    
Segment Reporting Information [Line Items]    
Total revenues 62,857 68,114
Total brokerage revenues    
Segment Reporting Information [Line Items]    
Total revenues 528,021 492,217
All other revenues    
Segment Reporting Information [Line Items]    
Total revenues $ 50,593 $ 40,650