Investments - Summary of Investments (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022
Summary of Investment Holdings [Line Items]
Investments owned	$ 212,521	$ 217,518
Seed capital
Summary of Investment Holdings [Line Items]
Investments owned	307,300	309,600
Equity securities | Long-term incentive compensation-related
Summary of Investment Holdings [Line Items]
Investments owned	17,792	21,055
Equity securities | Seed capital
Summary of Investment Holdings [Line Items]
Investments owned	139,871	138,012
Investments in limited partnership hedge funds | Long-term incentive compensation-related
Summary of Investment Holdings [Line Items]
Investments owned	20,146	26,815
Investments in limited partnership hedge funds | Seed capital
Summary of Investment Holdings [Line Items]
Investments owned	16,976	15,711
Time deposits
Summary of Investment Holdings [Line Items]
Investments owned	7,437	7,750
Other
Summary of Investment Holdings [Line Items]
Investments owned	$ 10,299	$ 8,175