Investments - Summary of Investments (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Summary of Investment Holdings [Line Items]
Investments owned	$ 217,518	$ 273,418
Seed capital
Summary of Investment Holdings [Line Items]
Investments owned	309,600	379,000
Equity securities: | Long-term incentive compensation-related
Summary of Investment Holdings [Line Items]
Investments owned	21,055	32,237
Equity securities: | Seed capital
Summary of Investment Holdings [Line Items]
Investments owned	138,012	133,992
Equity securities: | Other
Summary of Investment Holdings [Line Items]
Investments owned	0	18,243
Exchange-traded options
Summary of Investment Holdings [Line Items]
Investments owned	0	1,893
Investments in limited partnership hedge funds: | Long-term incentive compensation-related
Summary of Investment Holdings [Line Items]
Investments owned	26,815	31,602
Investments in limited partnership hedge funds: | Seed capital
Summary of Investment Holdings [Line Items]
Investments owned	15,711	19,318
Time deposits
Summary of Investment Holdings [Line Items]
Investments owned	7,750	21,024
Other
Summary of Investment Holdings [Line Items]
Investments owned	$ 8,175	$ 15,109