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Segment, Geographic and Product Information - Product Information Regarding Revenues (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Segment Reporting Information [Line Items]    
Total revenues $ 532,867 $ 506,464
Rates    
Segment Reporting Information [Line Items]    
Total revenues 164,737 158,809
Energy and Commodities    
Segment Reporting Information [Line Items]    
Total revenues 89,659 82,395
Credit    
Segment Reporting Information [Line Items]    
Total revenues 89,549 83,908
FX    
Segment Reporting Information [Line Items]    
Total revenues 80,158 80,025
Equities    
Segment Reporting Information [Line Items]    
Total revenues 68,114 67,128
Total brokerage revenues    
Segment Reporting Information [Line Items]    
Total revenues 492,217 472,265
All other revenues    
Segment Reporting Information [Line Items]    
Total revenues $ 40,650 $ 34,199