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Investments - Additional Information (Details) - USD ($)
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Dec. 31, 2010
Schedule of Investments [Line Items]        
Income from Equity Method Investments $ 3,024,000 $ 3,128,000    
Net Realized and Unrealized Gains (Losses) on Private Equity Fund Investments 39,000 (88,000)    
Previously Received Carried Interest Subject to Repayment 752,000      
Total Assets 2,725,913,000 2,221,552,000 $ 3,370,888,000  
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount $ 6,266,000   5,572,000  
Issued LP Units (in shares) 0      
Unfunded Commitments for Capital Contributions $ 11,787,000      
Equity Securities without Readily Determinable Fair Value, Amount 688,000   683,000  
Variable Interest Entity, Not Primary Beneficiary [Member]        
Schedule of Investments [Line Items]        
Total Assets 3,777,000   3,083,000  
Equity Method Investments [Member]        
Schedule of Investments [Line Items]        
Amortization of Intangible Assets $ 79,000 79,000    
ABS [Member]        
Schedule of Investments [Line Items]        
Equity Method Investment, Ownership Percentage 46.00%      
Income from Equity Method Investments $ 2,195,000 2,020,000    
Atalanta Sosnoff [Member]        
Schedule of Investments [Line Items]        
Equity Method Investment, Ownership Percentage 49.00%      
Income from Equity Method Investments $ 660,000 572,000    
Luminis [Member]        
Schedule of Investments [Line Items]        
Equity Method Investment, Ownership Percentage 20.00%      
Income from Equity Method Investments $ 169,000 $ 536,000    
G5 [Member]        
Schedule of Investments [Line Items]        
Debt Securities, Held-to-maturity 6,686,000   7,385,000  
Trilantic [Member]        
Schedule of Investments [Line Items]        
Issued LP Units (in shares)       500,000
Limited Partnership Investment       $ 16,090,000
Investment 6,435,000   6,623,000  
Trilantic IV [Member]        
Schedule of Investments [Line Items]        
Investment     1,178,000  
Trilantic V [Member]        
Schedule of Investments [Line Items]        
Investment 5,000   5,164,000  
Capital Commitment 5,000,000      
Unfunded Commitments for Capital Contributions 367,000      
Trilantic VI [Member]        
Schedule of Investments [Line Items]        
Investment 183,000   3,125,000  
Capital Commitment 12,000,000      
Unfunded Commitments for Capital Contributions 8,871,000      
Glisco [Member]        
Schedule of Investments [Line Items]        
Equity Securities without Readily Determinable Fair Value, Amount $ 387,000   $ 387,000