v3.26.1
Segment Operating Results - Segment Contribution (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Segment Reporting Information [Line Items]          
Net Revenues $ 990,199 $ 833,830 $ 2,381,777 $ 1,528,659  
Employee Compensation and Benefits 641,791 548,611 1,545,861 1,008,436  
Non-Compensation 180,517 134,830 337,299 258,650  
Special Charges, Including Business Realignment Costs 21,315 0 21,315 0  
Income Before Income from Equity Method Investments and Income Taxes 146,576 150,389 477,302 261,573  
Income (Loss) from Equity Method Investments 1,018 815 2,069 1,694  
Pre-Tax Income 147,594 151,204 479,371 263,267  
Identifiable Segment Assets 4,700,795 3,689,659 4,700,795 3,689,659 $ 5,358,097
Investment Banking & Equities          
Segment Reporting Information [Line Items]          
Net Revenues 966,877 812,171 2,335,627 1,486,703  
Employee Compensation and Benefits 627,299 535,447 1,516,453 983,476  
Non-Compensation 175,789 130,773 328,445 250,547  
Special Charges, Including Business Realignment Costs 21,315 0 21,315 0  
Income Before Income from Equity Method Investments and Income Taxes 142,474 145,951 469,414 252,680  
Income (Loss) from Equity Method Investments 18 11 26 (27)  
Pre-Tax Income 142,492 145,962 469,440 252,653  
Identifiable Segment Assets 4,577,617 3,575,400 4,577,617 3,575,400  
Investment Management          
Segment Reporting Information [Line Items]          
Net Revenues 23,322 21,659 46,150 41,956  
Employee Compensation and Benefits 14,492 13,164 29,408 24,960  
Non-Compensation 4,728 4,057 8,854 8,103  
Income Before Income from Equity Method Investments and Income Taxes 4,102 4,438 7,888 8,893  
Income (Loss) from Equity Method Investments 1,000 804 2,043 1,721  
Pre-Tax Income 5,102 5,242 9,931 10,614  
Identifiable Segment Assets $ 123,178 $ 114,259 $ 123,178 $ 114,259