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Geographic Information and Business Segments - Segments (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Segment Reporting Information [Line Items]    
Total revenue $ 642,839 $ 620,380
Income (loss) before income taxes and noncontrolling interest 139,820 134,765
Operating segments | Market Making    
Segment Reporting Information [Line Items]    
Total revenue 521,008 498,921
Income (loss) before income taxes and noncontrolling interest 126,953 124,109
Operating segments | Execution Services    
Segment Reporting Information [Line Items]    
Total revenue 117,788 118,478
Income (loss) before income taxes and noncontrolling interest 9,243 9,015
Segment reconciling items | Corporate    
Segment Reporting Information [Line Items]    
Total revenue 4,043 2,981
Income (loss) before income taxes and noncontrolling interest $ 3,624 $ 1,641