Consolidated Statements of Financial Condition (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Statement of Financial Position [Abstract]
Cash and securities segregated, at cost	$ 496,263	$ 495,391
Limited partners units issued (in units)	293,508,421	292,107,907
Limited partners, units outstanding (in units)	293,508,421	292,107,907