Investments - Summary of Investments (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Summary of Investment Holdings [Line Items]
Investments owned	$ 553,542	$ 535,204
Investments in joint ventures
Summary of Investment Holdings [Line Items]
Investments owned	280,648	286,721
Time deposits
Summary of Investment Holdings [Line Items]
Investments owned	6,024	6,100
Other
Summary of Investment Holdings [Line Items]
Investments owned	10,962	11,331
Long-term incentive compensation-related | Equity securities
Summary of Investment Holdings [Line Items]
Investments owned	26,407	31,934
Long-term incentive compensation-related | Investments in limited partnership hedge funds
Summary of Investment Holdings [Line Items]
Investments owned	20,059	10,831
Seed capital
Summary of Investment Holdings [Line Items]
Investments owned	356,700	294,700
Seed capital | Equity securities
Summary of Investment Holdings [Line Items]
Investments owned	187,611	169,502
Seed capital | Investments in limited partnership hedge funds
Summary of Investment Holdings [Line Items]
Investments owned	21,765	18,397
Other | Equity securities
Summary of Investment Holdings [Line Items]
Investments owned	$ 66	$ 388