Investments - Summary of Investments (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024
Summary of Investment Holdings [Line Items]
Investments owned	$ 521,188	$ 535,204
Joint ventures
Summary of Investment Holdings [Line Items]
Investments owned	267,217	286,721
Other equity method investments
Summary of Investment Holdings [Line Items]
Investments owned	2,852	0
Time deposits
Summary of Investment Holdings [Line Items]
Investments owned	6,847	6,100
Other
Summary of Investment Holdings [Line Items]
Investments owned	11,873	11,331
Long-term incentive compensation-related | Equity securities
Summary of Investment Holdings [Line Items]
Investments owned	29,193	31,934
Long-term incentive compensation-related | Investments in limited partnership hedge funds
Summary of Investment Holdings [Line Items]
Investments owned	19,653	10,831
Seed capital
Summary of Investment Holdings [Line Items]
Investments owned	369,700	294,700
Seed capital | Equity securities
Summary of Investment Holdings [Line Items]
Investments owned	160,591	169,502
Seed capital | Investments in limited partnership hedge funds
Summary of Investment Holdings [Line Items]
Investments owned	22,690	18,397
Other | Equity securities
Summary of Investment Holdings [Line Items]
Investments owned	$ 272	$ 388