Investments - Summary of Investments (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Summary of Investment Holdings [Line Items]
Investments owned	$ 211,938	$ 217,518
Seed capital
Summary of Investment Holdings [Line Items]
Investments owned	324,600	309,600
Equity securities | Long-term incentive compensation-related
Summary of Investment Holdings [Line Items]
Investments owned	17,145	21,055
Equity securities | Seed capital
Summary of Investment Holdings [Line Items]
Investments owned	134,775	138,012
Investments in limited partnership hedge funds | Long-term incentive compensation-related
Summary of Investment Holdings [Line Items]
Investments owned	26,839	26,815
Investments in limited partnership hedge funds | Seed capital
Summary of Investment Holdings [Line Items]
Investments owned	15,731	15,711
Time deposits
Summary of Investment Holdings [Line Items]
Investments owned	7,528	7,750
Other
Summary of Investment Holdings [Line Items]
Investments owned	$ 9,920	$ 8,175