Statements of Financial Condition (Parenthetical) (USD $)	Dec. 31, 2011	Dec. 31, 2010
Blended Strategies Portfolio [Member] | Class 0 Units [Member]
Members' capital:
Capital units, issued (in units)	1,814,039.586	1,752,436.237
Capital units, outstanding (in units)	1,814,039.586	1,752,436.237
Capital units, value (in dollars per unit)	$ 123.17	$ 138.96
Blended Strategies Portfolio [Member] | Class 2 Units [Member]
Members' capital:
Capital units, issued (in units)	410,047.431	409,129.824
Capital units, outstanding (in units)	410,047.431	409,129.824
Capital units, value (in dollars per unit)	$ 98.77	$ 113.68
Systematic Strategies Portfolio [Member] | Class 0 Units [Member]
Members' capital:
Capital units, issued (in units)	322,756.427	274,960.438
Capital units, outstanding (in units)	322,756.427	274,960.438
Capital units, value (in dollars per unit)	$ 81.35	$ 102.92
Systematic Strategies Portfolio [Member] | Class 2 Units [Member]
Members' capital:
Capital units, issued (in units)	255,073.907	202,003.861
Capital units, outstanding (in units)	255,073.907	202,003.861
Capital units, value (in dollars per unit)	$ 77.24	$ 99.72