Consolidated 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)	966,888.461	875,825.668
Capital units, outstanding (in units)	966,888.461	875,825.668
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)	278,890.248	230,452.833
Capital units, outstanding (in units)	278,890.248	230,452.833
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)	112,079.324	122,899.506
Capital units, outstanding (in units)	112,079.324	122,899.506
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)	184,238.954	86,626.635
Capital units, outstanding (in units)	184,238.954	86,626.635
Capital units, value (in dollars per unit)	$ 77.24	$ 99.72