Consolidated Statements of Financial Condition (Unaudited) (Parenthetical)	Jun. 30, 2016 $ / shares shares	Dec. 31, 2015 $ / shares shares
Class 0 Units [Member]
Members' capital:
Capital units, issued (in units)	359,650.877	390,743.099
Capital units, outstanding (in units)	359,650.877	390,743.099
Capital units, value (in dollars per unit) | $ / shares	144.89	147.34
Class 2 Units [Member]
Members' capital:
Capital units, issued (in units)	170,169.389	171,170.918
Capital units, outstanding (in units)	170,169.389	171,170.918
Capital units, value (in dollars per unit) | $ / shares	107.02	109.91