Investments Of Operating Entities And Consolidated Funds - Consolidated Funds - Receivable On And Payable For Derivative Contracts, At Fair Value (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Derivative [Line Items]
Receivable on derivative contracts, at fair value, Consolidated Funds	$ 0	$ 5,833
Payable for derivative contracts, at fair value, Consolidated Funds	0	4,769
Currency Forwards
Derivative [Line Items]
Receivable on derivative contracts, at fair value, Consolidated Funds	0	3,302
Payable for derivative contracts, at fair value, Consolidated Funds	0	88
Equity Swap
Derivative [Line Items]
Receivable on derivative contracts, at fair value, Consolidated Funds	0	927
Payable for derivative contracts, at fair value, Consolidated Funds	0	3,931
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Derivative [Line Items]
Receivable on derivative contracts, at fair value, Consolidated Funds	0	1,604
Payable for derivative contracts, at fair value, Consolidated Funds	$ 0	$ 750