Consolidated Statements of Financial Condition (Unaudited) (Parenthetical)	Sep. 30, 2019 $ / Unit shares	Dec. 31, 2018 $ / Unit shares
Class 0 Units [Member]
Members' capital:
Capital units, issued (in units)	111,332.718	125,660.811
Capital units, outstanding (in units)	111,332.718	125,660.811
Capital units, value (in dollars per unit) | $ / Unit	151.80	133.70
Class 2 Units [Member]
Members' capital:
Capital units, issued (in units)	102,760.337	116,424.562
Capital units, outstanding (in units)	102,760.337	116,424.562
Capital units, value (in dollars per unit) | $ / Unit	108.38	96.01