Consolidated Statements of Financial Condition (Unaudited) (Parenthetical)	Mar. 31, 2020 $ / Unit shares	Dec. 31, 2019 $ / Unit shares
Class 0 Units [Member]
Members' capital:
Capital units, issued (in units)	106,189.149	109,215.865
Capital units, outstanding (in units)	106,189.149	109,215.865
Capital units, value (in dollars per unit) | $ / Unit	159.32	152.04
Class 2 Units [Member]
Members' capital:
Capital units, issued (in units)	94,555.617	99,110.353
Capital units, outstanding (in units)	94,555.617	99,110.353
Capital units, value (in dollars per unit) | $ / Unit	113.79	108.35