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Segment, Geographic and Product Information - Product Information Regarding Revenues (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Segment Reporting Information [Line Items]                      
Total revenues $ 479,426 $ 455,039 $ 519,088 $ 603,167 $ 487,156 $ 521,137 $ 551,187 $ 544,751 $ 2,056,720 $ 2,104,231 $ 1,937,810
Rates [Member]                      
Segment Reporting Information [Line Items]                      
Total revenues                 544,094 594,884 549,825
Credit [Member]                      
Segment Reporting Information [Line Items]                      
Total revenues                 329,904 306,713 292,171
FX [Member]                      
Segment Reporting Information [Line Items]                      
Total revenues                 315,253 370,318 396,256
Energy and Commodities [Member]                      
Segment Reporting Information [Line Items]                      
Total revenues                 292,641 288,697 229,121
Equities Derivatives and Cash Equities [Member]                      
Segment Reporting Information [Line Items]                      
Total revenues                 254,702 251,339 288,265
Insurance [Member]                      
Segment Reporting Information [Line Items]                      
Total revenues                 182,707 155,790 68,937
Brokerage [Member]                      
Segment Reporting Information [Line Items]                      
Total revenues                 1,919,301 1,967,741 1,824,575
All Other Revenues [Member]                      
Segment Reporting Information [Line Items]                      
Total revenues                 $ 137,419 $ 136,490 $ 113,235