Condensed Consolidated Statements of Financial Condition (Parenthetical) - USD ($) $ in Thousands |
Sep. 30, 2026 |
Dec. 31, 2025 |
|---|---|---|
| Statement of Financial Position [Abstract] | ||
| Securities segregated, cost | $ 378,607 | $ 496,263 |
| Limited partners, units issued (in shares) | 293,146,945 | 293,508,421 |
| Limited partners, units outstanding (in shares) | 293,146,945 | 293,508,421 |