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Investments Of Operating Entities And Consolidated Funds - Consolidated Funds - Other Investments - Narrative (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Investment Holdings [Line Items]    
Portfolio Funds, Consolidated Funds $ 149,689 $ 175,769
Enterprise LP [Member]    
Investment Holdings [Line Items]    
Portfolio Funds, Consolidated Funds 88,675 99,153
Merger Fund [Member]    
Investment Holdings [Line Items]    
Portfolio Funds, Consolidated Funds $ 61,014 $ 76,616