Consolidated Statements of Financial Condition (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
ASSETS
Cash and securities segregated, at cost	$ 1,503,554	$ 1,752,483
Capital:
Limited partners units issued (in units)	271,453,043	270,509,658
Limited partners, units outstanding (in units)	271,453,043	270,509,658