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Segment, Geographic and Product Information - Product Information Regarding Revenues (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Segment Reporting Information [Line Items]    
Total revenues $ 506,464 $ 567,576
Rates    
Segment Reporting Information [Line Items]    
Total revenues 158,809 161,793
Credit    
Segment Reporting Information [Line Items]    
Total revenues 83,908 90,047
Energy and commodities    
Segment Reporting Information [Line Items]    
Total revenues 82,395 75,868
FX    
Segment Reporting Information [Line Items]    
Total revenues 80,025 83,433
Equities    
Segment Reporting Information [Line Items]    
Total revenues 67,128 70,462
Insurance    
Segment Reporting Information [Line Items]    
Total revenues 0 52,380
Total brokerage revenues    
Segment Reporting Information [Line Items]    
Total revenues 472,265 533,983
All other revenues    
Segment Reporting Information [Line Items]    
Total revenues $ 34,199 $ 33,593