Investments of Operating Entities and Consolidated Funds - Operating Entities - Equity Method Investment (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Schedule of Equity Method Investments [Line Items]
Equity method investments	$ 27,517	$ 47,200
Starboard Value LP
Schedule of Equity Method Investments [Line Items]
Equity method investments	19,845	36,889
Healthcare Royalty GP III, LLC
Schedule of Equity Method Investments [Line Items]
Equity method investments	1,640	1,957
HCR Canary Fund GP, LLC
Schedule of Equity Method Investments [Line Items]
Equity method investments	258	458
Healthcare Royalty GP IV, LLC
Schedule of Equity Method Investments [Line Items]
Equity method investments	1,837	1,716
RCG Longview Debt Fund IV Management, LLC
Schedule of Equity Method Investments [Line Items]
Equity method investments	331	331
HCR Overflow Fund GP, LLC
Schedule of Equity Method Investments [Line Items]
Equity method investments	589	839
HCRP MGS Account Management, LLC
Schedule of Equity Method Investments [Line Items]
Equity method investments	376	598
HCR Stafford Fund GP, LLC
Schedule of Equity Method Investments [Line Items]
Equity method investments	1,106	2,955
HCR Potomac Fund, L.P.
Schedule of Equity Method Investments [Line Items]
Equity method investments	1,014	925
Other
Schedule of Equity Method Investments [Line Items]
Equity method investments	$ 521	$ 532