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Investments - Summary of Other Equity Investments (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Schedule of Equity Method Investments [Line Items]    
Equity Method Investment $ 56,350 $ 59,508
ABS [Member]    
Schedule of Equity Method Investments [Line Items]    
Equity Method Investment 38,124 41,439
Atalanta Sosnoff [Member]    
Schedule of Equity Method Investments [Line Items]    
Equity Method Investment 11,670 11,950
Luminis [Member]    
Schedule of Equity Method Investments [Line Items]    
Equity Method Investment 6,068 6,119
Seneca Evercore [Member]    
Schedule of Equity Method Investments [Line Items]    
Equity Method Investment $ 488 $ 0