Consolidated Statements of Financial Condition (Unaudited) (Parenthetical)	Mar. 31, 2016 $ / shares shares	Dec. 31, 2015 $ / shares shares
Class 0 Units [Member]
Members' capital:
Capital units, issued (in units)	383,950.356	390,743.099
Capital units, outstanding (in units)	383,950.356	390,743.099
Capital units, value (in dollars per unit) | $ / shares	143.72	147.34
Class 2 Units [Member]
Members' capital:
Capital units, issued (in units)	170,543.267	171,170.918
Capital units, outstanding (in units)	170,543.267	171,170.918
Capital units, value (in dollars per unit) | $ / shares	106.68	109.91