Consolidated Statements of Financial Condition (Parenthetical) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Class 0 Units [Member]
Members' capital:
Capital units, issued (in units)	390,307.769	456,544.588
Capital units, outstanding (in units)	390,307.769	456,544.588
Capital units, value (in dollars per unit)	$ 149.37	$ 127.72
Class 2 Units [Member]
Members' capital:
Capital units, issued (in units)	178,245.791	186,461.512
Capital units, outstanding (in units)	178,245.791	186,461.512
Capital units, value (in dollars per unit)	$ 113.58	$ 98.41