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Segment, Geographic and Product Information - Product Information Regarding Revenues (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Segment Reporting Information [Line Items]      
Total revenues $ 2,015,364 $ 2,056,761 $ 2,104,606
Total brokerage revenues      
Segment Reporting Information [Line Items]      
Total revenues 1,869,661 1,919,301 1,967,741
Rates      
Segment Reporting Information [Line Items]      
Total revenues 558,507 544,094 594,884
FX      
Segment Reporting Information [Line Items]      
Total revenues 301,328 315,253 370,318
Energy and commodities      
Segment Reporting Information [Line Items]      
Total revenues 296,458 292,641 288,697
Credit      
Segment Reporting Information [Line Items]      
Total revenues 287,608 329,904 306,713
Equity derivatives and cash equities      
Segment Reporting Information [Line Items]      
Total revenues 247,673 254,702 251,339
Insurance      
Segment Reporting Information [Line Items]      
Total revenues 178,087 182,707 155,790
All other revenues      
Segment Reporting Information [Line Items]      
Total revenues $ 145,703 $ 137,460 $ 136,865