Financial Highlights (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Blended Strategies Portfolio [Member] | Class 0 Units [Member]
Per share operating performance [Abstract]
Net asset value per unit, beginning balance (in dollars per units)	$ 123.17	$ 138.96
Net loss [Abstract]
Net investment loss (in dollars per unit)	$ (4.88)	$ (5.53)
Net loss on investments (in dollars per unit)	$ (3.41)	$ (10.26)
Net loss (in dollars per unit)	$ (8.29)	$ (15.79)
Net asset value per unit, ending balance (in dollars per unit)	$ 114.88	$ 123.17
Ratios to average members' capital and total return [Abstract]
Total return before Incentive Allocation (in hundredths)	(6.73%)	(11.35%)
Incentive Allocation (in hundredths)	0.00%	(0.10%)
Total return after Incentive Allocation (in hundredths)	(6.73%)	(11.36%)
Net investment loss before Incentive Allocation (in hundredths)	(3.96%)	(3.97%)
Incentive Allocation (in hundredths)	0.00%	(0.10%)
Net investment loss after Incentive Allocation (in hundredths)	(3.96%)	(3.98%)
Total expenses before Incentive Allocation (in hundredths)	5.13%	5.15%
Incentive Allocation (in hundredths)	0.00%	0.10%
Total expenses after Incentive Allocation (in hundredths)	5.13%	5.16%
Blended Strategies Portfolio [Member] | Class 2 Units [Member]
Per share operating performance [Abstract]
Net asset value per unit, beginning balance (in dollars per units)	$ 98.77	$ 113.68
Net loss [Abstract]
Net investment loss (in dollars per unit)	$ (5.84)	$ (6.66)
Net loss on investments (in dollars per unit)	$ (2.64)	$ (8.25)
Net loss (in dollars per unit)	$ (8.48)	$ (14.91)
Net asset value per unit, ending balance (in dollars per unit)	$ 90.29	$ 98.77
Ratios to average members' capital and total return [Abstract]
Total return before Incentive Allocation (in hundredths)	(8.59%)	(13.11%)
Incentive Allocation (in hundredths)	0.00%	(0.10%)
Total return after Incentive Allocation (in hundredths)	(8.59%)	(13.12%)
Net investment loss before Incentive Allocation (in hundredths)	(5.91%)	(5.85%)
Incentive Allocation (in hundredths)	0.00%	(0.10%)
Net investment loss after Incentive Allocation (in hundredths)	(5.91%)	(5.86%)
Total expenses before Incentive Allocation (in hundredths)	7.18%	7.16%
Incentive Allocation (in hundredths)	0.00%	0.10%
Total expenses after Incentive Allocation (in hundredths)	7.18%	7.17%
Systematic Strategies Portfolio [Member] | Class 0 Units [Member]
Per share operating performance [Abstract]
Net asset value per unit, beginning balance (in dollars per units)	$ 81.35	$ 102.92
Net loss [Abstract]
Net investment loss (in dollars per unit)	$ (3.81)	$ (4.4)
Net loss on investments (in dollars per unit)	$ (4.08)	$ (17.17)
Net loss (in dollars per unit)	$ (7.89)	$ (21.57)
Net asset value per unit, ending balance (in dollars per unit)	$ 73.46	$ 81.35
Ratios to average members' capital and total return [Abstract]
Total return before Incentive Allocation (in hundredths)	(9.70%)	(20.95%)
Incentive Allocation (in hundredths)	0.00%	(0.10%)
Total return after Incentive Allocation (in hundredths)	(9.70%)	(20.96%)
Net investment loss before Incentive Allocation (in hundredths)	(4.68%)	(4.27%)
Incentive Allocation (in hundredths)	0.00%	(0.10%)
Net investment loss after Incentive Allocation (in hundredths)	(4.68%)	(4.28%)
Total expenses before Incentive Allocation (in hundredths)	5.22%	5.20%
Incentive Allocation (in hundredths)	0.00%	0.10%
Total expenses after Incentive Allocation (in hundredths)	5.22%	5.21%
Systematic Strategies Portfolio [Member] | Class 2 Units [Member]
Per share operating performance [Abstract]
Net asset value per unit, beginning balance (in dollars per units)	$ 77.24	$ 99.72
Net loss [Abstract]
Net investment loss (in dollars per unit)	$ (5.03)	$ (6.03)
Net loss on investments (in dollars per unit)	$ (3.85)	$ (16.45)
Net loss (in dollars per unit)	$ (8.88)	$ (22.48)
Net asset value per unit, ending balance (in dollars per unit)	$ 68.36	$ 77.24
Ratios to average members' capital and total return [Abstract]
Total return before Incentive Allocation (in hundredths)	(11.50%)	(22.53%)
Incentive Allocation (in hundredths)	0.00%	(0.10%)
Total return after Incentive Allocation (in hundredths)	(11.50%)	(22.54%)
Net investment loss before Incentive Allocation (in hundredths)	(6.52%)	(6.03%)
Incentive Allocation (in hundredths)	0.00%	(0.10%)
Net investment loss after Incentive Allocation (in hundredths)	(6.52%)	(6.04%)
Total expenses before Incentive Allocation (in hundredths)	7.16%	7.25%
Incentive Allocation (in hundredths)	0.00%	0.10%
Total expenses after Incentive Allocation (in hundredths)	7.16%	7.26%