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Investments - Additional Information (Details) - USD ($)
$ in Thousands
 1 Months Ended 3 Months Ended 9 Months Ended
Jul. 31, 2024
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Schedule of Investments [Line Items]            
Income (Loss) from Equity Method Investments   $ 1,082 $ 1,072 $ 2,776 $ 5,254  
Special Charges, Including Business Realignment Costs   0 7,305 0 7,305  
Net Realized and Unrealized Gains (Losses) on Private Equity Fund Investments   (25) (4) (1,119) (105)  
Previously Received Carried Interest Subject to Repayment   0   0    
Total Assets   4,422,246 3,567,547 4,422,246 3,567,547 $ 4,173,971
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount   3,509   3,509   5,138
Equity Securities without Readily Determinable Fair Value, Amount   1,671   1,671   625
Variable Interest Entity, Not Primary Beneficiary            
Schedule of Investments [Line Items]            
Total Assets   1,326   1,326   $ 2,956
Equity Method Investments            
Schedule of Investments [Line Items]            
Amortization of Intangible Assets   $ 62 79 $ 186 237  
Atalanta Sosnoff            
Schedule of Investments [Line Items]            
Equity Method Investment, Ownership Percentage   49.00%   49.00%    
Income (Loss) from Equity Method Investments   $ 1,071 865 $ 2,792 2,181  
Seneca Evercore            
Schedule of Investments [Line Items]            
Equity Method Investment, Ownership Percentage   20.00%   20.00%    
Income (Loss) from Equity Method Investments   $ 11 129 $ (16) 259  
ABS            
Schedule of Investments [Line Items]            
Equity Method Investment, Ownership Percentage 26.00%          
Income (Loss) from Equity Method Investments         2,031  
Proceeds from Sale of Equity Method Investments $ 18,113          
ABS | Other Revenue, Including Interest and Investments            
Schedule of Investments [Line Items]            
Equity Method Investment, Realized Gain (Loss) on Disposal     615   615  
Luminis            
Schedule of Investments [Line Items]            
Income (Loss) from Equity Method Investments     78   783  
Special Charges, Including Business Realignment Costs     7,305   7,305  
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax     581   581  
Reclassification from Noncontrolling Interest, Current Period, Net of Tax     $ 77   $ 77