Consolidated Statements of Financial Condition (Unaudited) (Parenthetical) (USD $)	Mar. 31, 2013	Dec. 31, 2012
Blended Strategies Portfolio [Member] | Class 0 Units [Member]
Members' capital:
Capital units, issued (in units)	589,496.728	657,725.570
Capital units, outstanding (in units)	589,496.728	657,725.570
Capital units, value (in dollars per unit)	$ 122.47	$ 114.88
Blended Strategies Portfolio [Member] | Class 2 Units [Member]
Members' capital:
Capital units, issued (in units)	195,966.416	203,657.512
Capital units, outstanding (in units)	195,966.416	203,657.512
Capital units, value (in dollars per unit)	$ 95.80	$ 90.29
Systematic Strategies Portfolio [Member] | Class 0 Units [Member]
Members' capital:
Capital units, issued (in units)	68,487.533	80,688.753
Capital units, outstanding (in units)	68,487.533	80,688.753
Capital units, value (in dollars per unit)	$ 80.62	$ 73.46
Systematic Strategies Portfolio [Member] | Class 2 Units [Member]
Members' capital:
Capital units, issued (in units)	90,132.664	121,088.299
Capital units, outstanding (in units)	90,132.664	121,088.299
Capital units, value (in dollars per unit)	$ 74.67	$ 68.36