Consolidated Statements of Financial Condition (Parenthetical)	Dec. 31, 2016 $ / shares shares	Dec. 31, 2015 $ / shares shares
Class 0 Units [Member]
Members' capital:
Capital units, issued (in units)	319,296.990	390,743.099
Capital units, outstanding (in units)	319,296.990	390,743.099
Capital units, value (in dollars per unit) | $ / shares	146.92	147.34
Class 2 Units [Member]
Members' capital:
Capital units, issued (in units)	154,401.114	171,170.918
Capital units, outstanding (in units)	154,401.114	171,170.918
Capital units, value (in dollars per unit) | $ / shares	107.43	109.91