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Segment Operating Results - Segment Expense Footnotes (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2025
Mar. 31, 2025
Dec. 31, 2024
Sep. 30, 2024
Jun. 30, 2024
Mar. 31, 2024
Dec. 31, 2023
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Dec. 31, 2023
Segment Reporting Information [Line Items]                            
Occupancy and Equipment Rental $ 27,530     $ 23,087             $ 80,175 $ 66,832    
Professional Fees 25,672     21,848             71,195 68,495    
Travel and Related Expenses 23,246     18,278             69,248 58,884    
Technology and Information Services 36,954     31,707             106,908 89,320    
Depreciation and Amortization 7,856     5,896             20,282 18,628    
Execution, Clearing and Custody Fees 2,962     3,346             9,488 9,738    
Acquisition and Transition Costs 3,516     0             5,153 0    
Other Operating Expenses 14,290     12,752             38,227 36,053    
Non-Compensation 142,026     116,914             400,676 347,950    
Revision of Prior Period, Reclassification, Adjustment                            
Segment Reporting Information [Line Items]                            
Professional Fees   $ (10,223) $ (10,196) (10,465) $ (9,851) $ (9,009) $ (9,066) $ (9,241) $ (8,186) $ (8,567)   (29,325) $ (39,521) $ (35,060)
Technology and Information Services   10,223 10,196 10,465 9,851 9,009 9,066 9,241 8,186 8,567   29,325 39,521 35,060
Investment Banking & Equities                            
Segment Reporting Information [Line Items]                            
Occupancy and Equipment Rental 26,904     22,404             78,268 65,047    
Professional Fees 24,528     20,792             67,731 65,431    
Travel and Related Expenses 23,006     18,120             68,546 58,264    
Technology and Information Services 35,700     30,723             103,363 86,496    
Depreciation and Amortization 7,726     5,824             19,961 18,375    
Execution, Clearing and Custody Fees 2,496     2,903             8,108 8,459    
Acquisition and Transition Costs 3,516     0             5,153 0    
Other Operating Expenses 13,949     12,327             37,242 34,876    
Non-Compensation 137,825     113,093             388,372 336,948    
Investment Banking & Equities | Revision of Prior Period, Reclassification, Adjustment                            
Segment Reporting Information [Line Items]                            
Professional Fees   (9,950) (9,947) (10,199) (9,598) (8,792) (8,843) (8,987) (7,960) (8,356)   (28,589) (38,536) (34,146)
Technology and Information Services   9,950 9,947 10,199 9,598 8,792 8,843 8,987 7,960 8,356   28,589 38,536 34,146
Investment Management                            
Segment Reporting Information [Line Items]                            
Occupancy and Equipment Rental 626     683             1,907 1,785    
Professional Fees 1,144     1,056             3,464 3,064    
Travel and Related Expenses 240     158             702 620    
Technology and Information Services 1,254     984             3,545 2,824    
Depreciation and Amortization 130     72             321 253    
Execution, Clearing and Custody Fees 466     443             1,380 1,279    
Other Operating Expenses 341     425             985 1,177    
Non-Compensation $ 4,201     3,821             $ 12,304 11,002    
Investment Management | Revision of Prior Period, Reclassification, Adjustment                            
Segment Reporting Information [Line Items]                            
Professional Fees   (273) (249) (266) (253) (217) (223) (254) (226) (211)   (736) (985) (914)
Technology and Information Services   $ 273 $ 249 $ 266 $ 253 $ 217 $ 223 $ 254 $ 226 $ 211   $ 736 $ 985 $ 914