Consolidated Statements of Financial Condition (Unaudited) (Parenthetical) (USD $)	Jun. 30, 2012	Dec. 31, 2011
Blended Strategies Portfolio [Member] | Class 0 Units [Member]
Members' capital:
Capital units, issued (in units)	857,997.566	966,888.461
Capital units, outstanding (in units)	857,997.566	966,888.461
Capital units, value (in dollars per unit)	$ 118.77	$ 123.17
Blended Strategies Portfolio [Member] | Class 2 Units [Member]
Members' capital:
Capital units, issued (in units)	237,529.986	278,890.248
Capital units, outstanding (in units)	237,529.986	278,890.248
Capital units, value (in dollars per unit)	$ 94.30	$ 98.77
Systematic Strategies Portfolio [Member] | Class 0 Units [Member]
Members' capital:
Capital units, issued (in units)	102,921.863	112,079.324
Capital units, outstanding (in units)	102,921.863	112,079.324
Capital units, value (in dollars per unit)	$ 78.23	$ 81.35
Systematic Strategies Portfolio [Member] | Class 2 Units [Member]
Members' capital:
Capital units, issued (in units)	156,556.588	184,238.954
Capital units, outstanding (in units)	156,556.588	184,238.954
Capital units, value (in dollars per unit)	$ 73.54	$ 77.24