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Investments (Tables)
 6 Months Ended
Jun. 30, 2025
Investments, Debt and Equity Securities [Abstract]  
Summary of Investments
Investments consist of:
 June 30,
2025		December 31,
2024
 (in thousands)
Equity securities:
    Long-term incentive compensation-related$29,193 $31,934 
    Seed capital 160,591 169,502 
    Other272 388 
Investments in limited partnership hedge funds:  
Long-term incentive compensation-related19,653 10,831 
Seed capital22,690 18,397 
Equity method investments:
  Joint ventures267,217 286,721 
  Other equity method investments2,852 — 
Time deposits6,847 6,100 
Other 11,873 11,331 
Total investments$521,188 $535,204 
Summary of Unrealized Gains (Losses) Related to Equity Securities
The portion of unrealized gains (losses) related to equity securities, as defined by ASC 321-10, held as of June 30, 2025 and 2024 were as follows:
 Three Months Ended June 30,Six Months Ended June 30,
 2025202420252024
 (in thousands)
Net gains recognized during the period$10,495 $986 $10,408 $12,044 
Less: net gains (losses) recognized during the period on equity securities sold during the period1,197 (1,362)5,767 6,027 
Unrealized gains recognized during the period on equity securities held$9,298 $2,348 $4,641 $6,017