Investments Of Operating Entities And Consolidated Funds - Consolidated Funds - Receivable On And Payable For Derivative Contracts, At Fair Value (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Derivative [Line Items]
Receivable on derivative contracts, at fair value	$ 17,292	$ 5,833
Payable for derivative contracts, at fair value, Consolidated Funds	18,066	4,769
Currency Forwards
Derivative [Line Items]
Receivable on derivative contracts, at fair value	3,621	3,302
Payable for derivative contracts, at fair value, Consolidated Funds	186	88
Equity Swap
Derivative [Line Items]
Receivable on derivative contracts, at fair value	10,271	927
Payable for derivative contracts, at fair value, Consolidated Funds	17,093	3,931
Options
Derivative [Line Items]
Receivable on derivative contracts, at fair value	3,400	1,604
Payable for derivative contracts, at fair value, Consolidated Funds	$ 787	$ 750