Consolidated Statements of Financial Condition (Parenthetical) (USD $)	Dec. 31, 2012	Dec. 31, 2011
Blended Strategies Portfolio [Member] | Class 0 Units [Member]
Members' capital:
Capital units, issued (in units)	657,725.570	966,888.461
Capital units, outstanding (in units)	657,725.570	966,888.461
Capital units, value (in dollars per unit)	$ 114.88	$ 123.17
Blended Strategies Portfolio [Member] | Class 2 Units [Member]
Members' capital:
Capital units, issued (in units)	203,657.512	278,890.248
Capital units, outstanding (in units)	203,657.512	278,890.248
Capital units, value (in dollars per unit)	$ 90.29	$ 98.77
Systematic Strategies Portfolio [Member] | Class 0 Units [Member]
Members' capital:
Capital units, issued (in units)	80,688.753	112,079.324
Capital units, outstanding (in units)	80,688.753	112,079.324
Capital units, value (in dollars per unit)	$ 73.46	$ 81.35
Systematic Strategies Portfolio [Member] | Class 2 Units [Member]
Members' capital:
Capital units, issued (in units)	121,088.299	184,238.954
Capital units, outstanding (in units)	121,088.299	184,238.954
Capital units, value (in dollars per unit)	$ 68.36	$ 77.24