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Revenues from Contracts with Customers - Schedule of Revenues from Contracts with Customers and Other Sources of Revenues (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Revenues From Contracts With Customers [Line Items]        
Total revenues from contracts with customers $ 620,786 $ 448,850 $ 1,803,397 $ 1,337,434
Principal transactions 99,951 93,551 336,432 304,839
Interest and dividend income 14,039 16,944 40,936 43,853
Other revenues 2,073 1,766 4,328 4,360
Total revenues 736,849 561,111 2,185,093 1,690,486
Commissions        
Revenues From Contracts With Customers [Line Items]        
Total revenues from contracts with customers 573,159 407,095 1,667,366 1,217,348
Data, network and post-trade        
Revenues From Contracts With Customers [Line Items]        
Total revenues from contracts with customers 34,349 32,661 102,311 94,376
Fees from related parties        
Revenues From Contracts With Customers [Line Items]        
Total revenues from contracts with customers 4,453 5,106 14,116 14,170
Other revenues        
Revenues From Contracts With Customers [Line Items]        
Total revenues from contracts with customers $ 8,825 $ 3,988 $ 19,604 $ 11,540