Consolidated Statements of Financial Condition (Parenthetical)	Dec. 31, 2019 $ / Unit shares	Dec. 31, 2018 $ / Unit shares
Class 0 Units [Member]
Members' capital:
Capital units, issued (in units)	109,215.865	125,660.811
Capital units, outstanding (in units)	109,215.865	125,660.811
Capital units, value (in dollars per unit) | $ / Unit	152.04	133.70
Class 2 Units [Member]
Members' capital:
Capital units, issued (in units)	99,110.353	116,424.562
Capital units, outstanding (in units)	99,110.353	116,424.562
Capital units, value (in dollars per unit) | $ / Unit	108.35	96.01