Consolidated Statements of Financial Condition (Unaudited) (Parenthetical) (USD $)	Sep. 30, 2012	Dec. 31, 2011
Blended Strategies Portfolio [Member] | Class 0 Units [Member]
Members' capital:
Capital units, issued (in units)	793,290.657	966,888.461
Capital units, outstanding (in units)	793,290.657	966,888.461
Capital units, value (in dollars per unit)	$ 116.90	$ 123.17
Blended Strategies Portfolio [Member] | Class 2 Units [Member]
Members' capital:
Capital units, issued (in units)	223,180.736	278,890.248
Capital units, outstanding (in units)	223,180.736	278,890.248
Capital units, value (in dollars per unit)	$ 92.35	$ 98.77
Systematic Strategies Portfolio [Member] | Class 0 Units [Member]
Members' capital:
Capital units, issued (in units)	90,016.962	112,079.324
Capital units, outstanding (in units)	90,016.962	112,079.324
Capital units, value (in dollars per unit)	$ 77.99	$ 81.35
Systematic Strategies Portfolio [Member] | Class 2 Units [Member]
Members' capital:
Capital units, issued (in units)	145,806.452	184,238.954
Capital units, outstanding (in units)	145,806.452	184,238.954
Capital units, value (in dollars per unit)	$ 72.94	$ 77.24