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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, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Schedule of Investments [Line Items]            
Income (Loss) from Equity Method Investments   $ 1,072 $ 1,664 $ 5,254 $ 4,674  
Special Charges, Including Business Realignment Costs   7,305 0 7,305 2,921  
Net Realized and Unrealized Gains (Losses) on Private Equity Fund Investments   (4) 54 (105) 694  
Previously Received Carried Interest Subject to Repayment   0   0    
Total Assets   3,567,547 3,225,798 3,567,547 3,225,798 $ 3,703,298
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount   5,330   5,330   5,762
Equity Securities without Readily Determinable Fair Value, Amount   668   668   636
Variable Interest Entity, Not Primary Beneficiary [Member]            
Schedule of Investments [Line Items]            
Total Assets   3,147   3,147   $ 3,580
Equity Method Investments [Member]            
Schedule of Investments [Line Items]            
Amortization of Intangible Assets   79 79 237 237  
ABS [Member]            
Schedule of Investments [Line Items]            
Equity Method Investment, Ownership Percentage 26.00%          
Proceeds from Sale of Equity Method Investments $ 18,113          
Income (Loss) from Equity Method Investments     1,066 2,031 3,136  
ABS [Member] | Other Revenue, Including Interest and Investments            
Schedule of Investments [Line Items]            
Equity Method Investment, Realized Gain (Loss) on Disposal   $ 615   $ 615    
Atalanta Sosnoff [Member]            
Schedule of Investments [Line Items]            
Equity Method Investment, Ownership Percentage   49.00%   49.00%    
Income (Loss) from Equity Method Investments   $ 865 418 $ 2,181 1,144  
Luminis [Member]            
Schedule of Investments [Line Items]            
Income (Loss) from Equity Method Investments   78 53 783 350  
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    
Seneca Evercore [Member]            
Schedule of Investments [Line Items]            
Equity Method Investment, Ownership Percentage   20.00%   20.00%    
Income (Loss) from Equity Method Investments   $ 129 $ 127 $ 259 $ 44