Consolidated Statements of Financial Condition (Unaudited) (Parenthetical) (USD $)	Mar. 31, 2015	Dec. 31, 2014
Class 0 Units [Member]
Members' capital:
Capital units, issued (in units)	392,050.086	390,307.769
Capital units, outstanding (in units)	392,050.086	390,307.769
Capital units, value (in dollars per unit)	$ 159.93	$ 149.37
Class 2 Units [Member]
Members' capital:
Capital units, issued (in units)	175,236.469	178,245.791
Capital units, outstanding (in units)	175,236.469	178,245.791
Capital units, value (in dollars per unit)	$ 121.12	$ 113.58