Financial Highlights (Details) (USD $)	3 Months Ended				6 Months Ended
	Jun. 30, 2012		Jun. 30, 2011		Jun. 30, 2012		Jun. 30, 2011
Blended Strategies Portfolio [Member]
Ratios to average members' capital and total return [Abstract]
Total expenses before commission reimbursements (in hundredths)	0.23%		0.13%		0.85%		0.52%
Blended Strategies Portfolio [Member] | Class 0 Units [Member]
Per share operating performance
Net asset value per unit, beginning balance (in dollars per units)	126.14		137.45		123.17		138.96
Net income (loss):
Net investment loss (in dollars per unit)	(1.21)		(1.55)		(2.41)		(2.82)
Net loss on investments (in dollars per unit)	(6.16)		(3.23)		(1.99)		(3.47)
Net loss (in dollars per unit)	(7.37)		(4.78)		(4.4)		(6.29)
Net asset value per unit, ending balance (in dollars per unit)	118.77		132.67		118.77		132.67
Ratios to average members' capital and total return [Abstract]
Total return before Incentive Allocation (in hundredths)	(5.84%)		(3.48%)		(3.57%)		(4.52%)
Incentive Allocation (in hundredths)	0.00%		0.00%		0.00%		(0.01%)
Total return after Incentive Allocation (in hundredths)	(5.84%)		(3.48%)		(3.57%)		(4.53%)
Net investment loss before Incentive Allocation (in hundredths)	(0.96%)		(1.13%)		(1.95%)		(2.02%)
Incentive Allocation (in hundredths)	0.00%		0.00%		0.00%		(0.01%)
Net investment loss after Incentive Allocation (in hundredths)	(0.96%)		(1.13%)		(1.95%)		(2.03%)
Total expenses before Incentive Allocation (in hundredths)	1.26%		1.55%		2.54%		2.55%
Incentive Allocation (in hundredths)	0.00%		0.00%		0.00%		0.01%
Total expenses after Incentive Allocation (in hundredths)	1.26%	[1]	1.55%	[1]	2.54%	[2]	2.56%	[2]
Blended Strategies Portfolio [Member] | Class 2 Units [Member]
Per share operating performance
Net asset value per unit, beginning balance (in dollars per units)	100.65		111.91		98.77		113.68
Net income (loss):
Net investment loss (in dollars per unit)	(1.47)		(1.87)		(2.94)		(3.44)
Net loss on investments (in dollars per unit)	(4.88)		(2.56)		(1.53)		(2.76)
Net loss (in dollars per unit)	(6.35)		(4.43)		(4.47)		(6.2)
Net asset value per unit, ending balance (in dollars per unit)	94.30		107.48		94.30		107.48
Ratios to average members' capital and total return [Abstract]
Total return before Incentive Allocation (in hundredths)	(6.31%)		(3.96%)		(4.53%)		(5.44%)
Incentive Allocation (in hundredths)	0.00%		0.00%		0.00%		(0.01%)
Total return after Incentive Allocation (in hundredths)	(6.31%)		(3.96%)		(4.53%)		(5.45%)
Net investment loss before Incentive Allocation (in hundredths)	(1.46%)		(1.67%)		(2.98%)		(3.02%)
Incentive Allocation (in hundredths)	0.00%		0.00%		0.00%		(0.01%)
Net investment loss after Incentive Allocation (in hundredths)	(1.46%)		(1.67%)		(2.98%)		(3.03%)
Total expenses before Incentive Allocation (in hundredths)	1.78%		2.06%		3.57%		3.57%
Incentive Allocation (in hundredths)	0.00%		0.00%		0.00%		0.01%
Total expenses after Incentive Allocation (in hundredths)	1.78%	[1]	2.06%	[1]	3.57%	[2]	3.58%	[2]
Systematic Strategies Portfolio [Member]
Ratios to average members' capital and total return [Abstract]
Total expenses before commission reimbursements (in hundredths)	0.08%		0.08%		0.32%		0.32%
Systematic Strategies Portfolio [Member] | Class 0 Units [Member]
Per share operating performance
Net asset value per unit, beginning balance (in dollars per units)	82.32		100.08		81.35		102.92
Net income (loss):
Net investment loss (in dollars per unit)	(0.92)		(1.26)		(1.84)		(2.31)
Net loss on investments (in dollars per unit)	(3.17)		(3.23)		(1.28)		(5.02)
Net loss (in dollars per unit)	(4.09)		(4.49)		(3.12)		(7.33)
Net asset value per unit, ending balance (in dollars per unit)	78.23		95.59		78.23		95.59
Ratios to average members' capital and total return [Abstract]
Total return before Incentive Allocation (in hundredths)	(4.97%)		(4.49%)		(3.84%)		(7.11%)
Incentive Allocation (in hundredths)	0.00%		0.00%		0.00%		(0.01%)
Total return after Incentive Allocation (in hundredths)	(4.97%)		(4.49%)		(3.84%)		(7.12%)
Net investment loss before Incentive Allocation (in hundredths)	(1.12%)		(1.26%)		(2.26%)		(2.23%)
Incentive Allocation (in hundredths)	0.00%		0.00%		0.00%		(0.01%)
Net investment loss after Incentive Allocation (in hundredths)	(1.12%)		(1.26%)		(2.26%)		(2.24%)
Total expenses before Incentive Allocation (in hundredths)	1.26%		1.46%		2.53%		2.58%
Incentive Allocation (in hundredths)	0.00%		0.00%		0.00%		0.01%
Total expenses after Incentive Allocation (in hundredths)	1.26%	[3]	1.46%	[3]	2.53%	[4]	2.59%	[4]
Systematic Strategies Portfolio [Member] | Class 2 Units [Member]
Per share operating performance
Net asset value per unit, beginning balance (in dollars per units)	77.77		96.48		77.24		99.72
Net income (loss):
Net investment loss (in dollars per unit)	(1.26)		(1.74)		(2.52)		(3.24)
Net loss on investments (in dollars per unit)	(2.97)		(3.05)		(1.18)		(4.79)
Net loss (in dollars per unit)	(4.23)		(4.79)		(3.70)		(8.03)
Net asset value per unit, ending balance (in dollars per unit)	73.54		91.69		73.54		91.69
Ratios to average members' capital and total return [Abstract]
Total return before Incentive Allocation (in hundredths)	(5.44%)		(4.96%)		(4.79%)		(8.04%)
Incentive Allocation (in hundredths)	0.00%		0.00%		0.00%		(0.01%)
Total return after Incentive Allocation (in hundredths)	(5.44%)		(4.96%)		(4.79%)		(8.05%)
Net investment loss before Incentive Allocation (in hundredths)	(1.62%)		(1.80%)		(3.26%)		(3.24%)
Incentive Allocation (in hundredths)	0.00%		0.00%		0.00%		(0.01%)
Net investment loss after Incentive Allocation (in hundredths)	(1.62%)		(1.80%)		(3.26%)		(3.25%)
Total expenses before Incentive Allocation (in hundredths)	1.76%		1.99%		3.54%		3.63%
Incentive Allocation (in hundredths)	0.00%		0.00%		0.00%		0.01%
Total expenses after Incentive Allocation (in hundredths)	1.76%	[3]	1.99%	[3]	3.54%	[4]	3.64%	[4]

[1] The percentages noted above represent total expenses before commission reimbursements, which represent 0.23% and 0.13% of average members' capital for the periods then ended.

[2] The percentages noted above represent total expenses before commission reimbursements, which represent 0.85% and 0.52% of average members' capital for the periods then ended.

[3] The percentages noted above represent total expenses before commission reimbursements, which represent 0.08% and 0.08% of average members' capital for the periods then ended.

[4] The percentages noted above represent total expenses before commission reimbursements, which represent 0.32% and 0.32% of average members' capital for the periods then ended.