Consolidated Statements of Financial Condition (Unaudited) (Parenthetical) (USD $)	Mar. 31, 2012	Dec. 31, 2011
Blended Strategies Portfolio [Member] | Class 0 units [Member]
Members' capital:
Capital units, issued (in units)	941,155.031	966,888.461
Capital units, outstanding (in units)	941,155.031	966,888.461
Capital units, value (in dollars per unit)	$ 126.14	$ 123.17
Blended Strategies Portfolio [Member] | Class 2 Units [Member]
Members' capital:
Capital units, issued (in units)	265,561.479	278,890.248
Capital units, outstanding (in units)	265,561.479	278,890.248
Capital units, value (in dollars per unit)	$ 100.65	$ 98.77
Systematic Strategies Portfolio [Member] | Class 0 units [Member]
Members' capital:
Capital units, issued (in units)	106,700.645	112,079.324
Capital units, outstanding (in units)	106,700.645	112,079.324
Capital units, value (in dollars per unit)	$ 82.32	$ 81.35
Systematic Strategies Portfolio [Member] | Class 2 Units [Member]
Members' capital:
Capital units, issued (in units)	166,006.616	184,238.954
Capital units, outstanding (in units)	166,006.616	184,238.954
Capital units, value (in dollars per unit)	$ 77.77	$ 77.24