Investments - Summary of Investments (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Summary of Investment Holdings [Line Items]
Investments owned	$ 216,463	$ 273,418
Long-term incentive compensation obligations	47,100	63,800
Seed capital
Summary of Investment Holdings [Line Items]
Investments owned	287,200	379,000
Equity securities | Long-term incentive compensation-related
Summary of Investment Holdings [Line Items]
Investments owned	20,897	32,237
Equity securities | Seed capital
Summary of Investment Holdings [Line Items]
Investments owned	119,083	133,992
Equity securities | Other
Summary of Investment Holdings [Line Items]
Investments owned	1,401	18,243
Exchange-traded options
Summary of Investment Holdings [Line Items]
Investments owned	59	1,893
Investments in limited partnership hedge funds | Long-term incentive compensation-related
Summary of Investment Holdings [Line Items]
Investments owned	26,165	31,602
Investments in limited partnership hedge funds | Seed capital
Summary of Investment Holdings [Line Items]
Investments owned	17,632	19,318
Time deposits
Summary of Investment Holdings [Line Items]
Investments owned	20,210	21,024
Other
Summary of Investment Holdings [Line Items]
Investments owned	$ 11,016	$ 15,109