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Segment and Geographic Information - Product Information Regarding Revenues (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Segment Reporting Information [Line Items]        
Total revenues $ 736,849 $ 561,111 $ 2,185,093 $ 1,690,486
Fees from related parties 4,453 5,106 14,116 14,170
Data, software, and post-trade 34,349 32,661 102,311 94,376
Interest and dividend income 14,039 16,944 40,936 43,853
Other revenues 10,898 5,754 23,932 15,900
Compensation and employee benefits 400,262 271,307 1,158,373 834,139
Equity-based compensation and allocations of net income to limited partnership units and FPUs 74,447 85,690 233,696 247,978
Total compensation and employee benefits 474,709 356,997 1,392,069 1,082,117
Consolidated net income (loss) 26,062 13,713 135,706 99,929
Reportable Segment        
Segment Reporting Information [Line Items]        
Total revenues 736,849 561,111 2,185,093 1,690,486
Fees from related parties 4,453 5,106 14,116 14,170
Data, software, and post-trade 34,349 32,661 102,311 94,376
Interest and dividend income 14,039 16,944 40,936 43,853
Other revenues 10,898 5,754 23,932 15,900
Compensation and employee benefits 400,262 271,307 1,158,373 834,139
Equity-based compensation and allocations of net income to limited partnership units and FPUs 74,447 85,690 233,696 247,978
Total compensation and employee benefits 474,709 356,997 1,392,069 1,082,117
Other segment items 236,078 190,401 657,318 508,440
Consolidated net income (loss) 26,062 13,713 135,706 99,929
Interest income 14,000 16,100 40,300 37,100
Depreciation and intangible amortization 27,400 19,900 75,200 60,700
Reportable Segment | Total brokerage revenues        
Segment Reporting Information [Line Items]        
Total revenues 673,110 500,646 2,003,798 1,522,187
Reportable Segment | ECS        
Segment Reporting Information [Line Items]        
Total revenues 241,622 112,921 653,199 349,128
Reportable Segment | Rates        
Segment Reporting Information [Line Items]        
Total revenues 195,328 174,313 596,852 515,442
Reportable Segment | FX        
Segment Reporting Information [Line Items]        
Total revenues 106,672 92,076 325,159 265,045
Reportable Segment | Credit        
Segment Reporting Information [Line Items]        
Total revenues 69,085 68,000 231,303 224,973
Reportable Segment | Equities        
Segment Reporting Information [Line Items]        
Total revenues 60,403 53,336 197,285 167,599
Reportable Segment | Total other revenues        
Segment Reporting Information [Line Items]        
Total revenues $ 63,739 $ 60,465 $ 181,295 $ 168,299