Investments - Summary of Investments (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Summary of Investment Holdings [Line Items]
Investments owned	$ 220,268	$ 243,554
Time deposits
Summary of Investment Holdings [Line Items]
Investments owned	6,249	6,517
Other
Summary of Investment Holdings [Line Items]
Investments owned	11,140	10,609
Long-term incentive compensation-related | Equity securities
Summary of Investment Holdings [Line Items]
Investments owned	25,029	18,882
Long-term incentive compensation-related | Investments in limited partnership hedge funds
Summary of Investment Holdings [Line Items]
Investments owned	11,712	21,151
Seed capital
Summary of Investment Holdings [Line Items]
Investments owned	343,400	394,200
Seed capital | Equity securities
Summary of Investment Holdings [Line Items]
Investments owned	148,615	128,771
Seed capital | Investments in limited partnership hedge funds
Summary of Investment Holdings [Line Items]
Investments owned	$ 17,523	$ 57,624