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Segment Operating Results - Segment Contribution (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Segment Reporting Information [Line Items]          
Net Revenues $ 1,038,884 $ 734,222 $ 2,567,543 $ 2,004,261  
Employee Compensation and Benefits 680,652 488,010 1,689,088 1,334,650  
Non-Compensation 142,026 116,914 400,676 347,950  
Special Charges, Including Business Realignment Costs 0 7,305 0 7,305  
Income Before Income from Equity Method Investments and Income Taxes 216,206 121,993 477,779 314,356  
Income (Loss) from Equity Method Investments 1,082 1,072 2,776 5,254  
Pre-Tax Income 217,288 123,065 480,555 319,610  
Identifiable Segment Assets 4,422,246 3,567,547 4,422,246 3,567,547 $ 4,173,971
Investment Banking & Equities          
Segment Reporting Information [Line Items]          
Net Revenues 1,016,192 712,775 2,502,895 1,944,513  
Employee Compensation and Benefits 664,616 475,990 1,648,092 1,301,341  
Non-Compensation 137,825 113,093 388,372 336,948  
Special Charges, Including Business Realignment Costs 0 7,305 0 7,305  
Income Before Income from Equity Method Investments and Income Taxes 213,751 116,387 466,431 298,919  
Income (Loss) from Equity Method Investments 11 207 (16) 1,042  
Pre-Tax Income 213,762 116,594 466,415 299,961  
Identifiable Segment Assets 4,280,890 3,432,220 4,280,890 3,432,220  
Investment Management          
Segment Reporting Information [Line Items]          
Net Revenues 22,692 21,447 64,648 59,748  
Employee Compensation and Benefits 16,036 12,020 40,996 33,309  
Non-Compensation 4,201 3,821 12,304 11,002  
Income Before Income from Equity Method Investments and Income Taxes 2,455 5,606 11,348 15,437  
Income (Loss) from Equity Method Investments 1,071 865 2,792 4,212  
Pre-Tax Income 3,526 6,471 14,140 19,649  
Identifiable Segment Assets $ 141,356 $ 135,327 $ 141,356 $ 135,327