Consolidated Statements of Financial Condition (Unaudited) (Parenthetical)	Sep. 30, 2015 $ / shares shares	Dec. 31, 2014 $ / shares shares
Class 0 Units [Member]
Members' capital:
Capital units, issued (in units)	385,619.008	390,307.769
Capital units, outstanding (in units)	385,619.008	390,307.769
Capital units, value (in dollars per unit) | $ / shares	150.63	149.37
Class 2 Units [Member]
Members' capital:
Capital units, issued (in units)	187,973.394	178,245.791
Capital units, outstanding (in units)	187,973.394	178,245.791
Capital units, value (in dollars per unit) | $ / shares	112.94	113.58