Financial Highlights (Details) (USD $)	3 Months Ended				9 Months Ended
	Sep. 30, 2012		Sep. 30, 2011		Sep. 30, 2012		Sep. 30, 2011
Blended Strategies Portfolio [Member] | Class 0 Units [Member]
Per unit operating performance
Net asset value per unit, beginning balance (in dollars per units)	$ 118.77		$ 132.67		$ 123.17		$ 138.96
Net income (loss):
Net investment loss (in dollars per unit)	$ (1.27)		$ (2.50)		$ (3.68)		$ (5.32)
Net gain (loss) on investments (in dollars per unit)	$ (0.60)		$ 1.41		$ (2.59)		$ (2.06)
Net loss (in dollars per unit)	$ (1.87)		$ (1.09)		$ (6.27)		$ (7.38)
Net asset value per unit, ending balance (in dollars per unit)	$ 116.90		$ 131.58		$ 116.90		$ 131.58
Ratios to average members' capital and total return [Abstract]
Total return before Incentive Allocation (in hundredths)	(1.57%)		(0.82%)		(5.09%)		(5.30%)
Incentive Allocation (in hundredths)	0.00%		0.00%		0.00%		(1.00%)
Total return after Incentive Allocation (in hundredths)	(1.57%)		(0.82%)		(5.09%)		(5.31%)
Net investment loss before Incentive Allocation (in hundredths)	(1.06%)		(1.88%)		(2.99%)		(3.82%)
Incentive Allocation (in hundredths)	0.00%		0.00%		0.00%		(1.00%)
Net investment loss after Incentive Allocation (in hundredths)	(1.06%)		(1.88%)		(2.99%)		(3.83%)
Total expenses before Incentive Allocation (in hundredths)	1.31%		1.32%		3.83%		3.87%
Incentive Allocation (in hundredths)	0.00%		0.00%		0.00%		1.00%
Total expenses after Incentive Allocation (in hundredths)	1.31%	[1]	1.32%	[1]	3.83%	[2]	3.88%	[2]
Commission reimbursements (in hundredths)	0.20%		0.20%		0.70%		0.79%
Blended Strategies Portfolio [Member] | Class 2 Units [Member]
Per unit operating performance
Net asset value per unit, beginning balance (in dollars per units)	$ 94.30		$ 107.48		$ 98.77		$ 113.68
Net income (loss):
Net investment loss (in dollars per unit)	$ (1.49)		$ (2.54)		$ (4.43)		$ (5.98)
Net gain (loss) on investments (in dollars per unit)	$ (0.46)		$ 1.12		$ (1.99)		$ (1.64)
Net loss (in dollars per unit)	$ (1.95)		$ (1.42)		$ (6.42)		$ (7.62)
Net asset value per unit, ending balance (in dollars per unit)	$ 92.35		$ 106.06		$ 92.35		$ 106.06
Ratios to average members' capital and total return [Abstract]
Total return before Incentive Allocation (in hundredths)	(2.07%)		(1.32%)		(6.50%)		(6.69%)
Incentive Allocation (in hundredths)	0.00%		0.00%		0.00%		(1.00%)
Total return after Incentive Allocation (in hundredths)	(2.07%)		(1.32%)		(6.50%)		(6.70%)
Net investment loss before Incentive Allocation (in hundredths)	(1.57%)		(2.36%)		(4.52%)		(5.25%)
Incentive Allocation (in hundredths)	0.00%		0.00%		0.00%		(1.00%)
Net investment loss after Incentive Allocation (in hundredths)	(1.57%)		(2.36%)		(4.52%)		(5.26%)
Total expenses before Incentive Allocation (in hundredths)	1.81%		1.80%		5.36%		5.37%
Incentive Allocation (in hundredths)	0.00%		0.00%		0.00%		1.00%
Total expenses after Incentive Allocation (in hundredths)	1.81%	[1]	1.80%	[1]	5.36%	[2]	5.38%	[2]
Commission reimbursements (in hundredths)	0.20%		0.20%		0.70%		0.79%
Systematic Strategies Portfolio [Member] | Class 0 Units [Member]
Per unit operating performance
Net asset value per unit, beginning balance (in dollars per units)	$ 78.23		$ 95.59		$ 81.35		$ 102.92
Net income (loss):
Net investment loss (in dollars per unit)	$ (1.04)		$ (1.12)		$ (2.89)		$ (3.43)
Net gain (loss) on investments (in dollars per unit)	$ 0.80		$ (5.09)		$ (0.47)		$ (10.11)
Net loss (in dollars per unit)	$ (0.24)		$ (6.21)		$ (3.36)		$ (13.54)
Net asset value per unit, ending balance (in dollars per unit)	$ 77.99		$ 89.38		$ 77.99		$ 89.38
Ratios to average members' capital and total return [Abstract]
Total return before Incentive Allocation (in hundredths)	(0.31%)		(6.50%)		(4.13%)		(13.15%)
Incentive Allocation (in hundredths)	0.00%		0.00%		0.00%		(1.00%)
Total return after Incentive Allocation (in hundredths)	(0.31%)		(6.50%)		(4.13%)		(13.16%)
Net investment loss before Incentive Allocation (in hundredths)	(1.29%)		(1.17%)		(3.53%)		(3.32%)
Incentive Allocation (in hundredths)	0.00%		0.00%		0.00%		(1.00%)
Net investment loss after Incentive Allocation (in hundredths)	(1.29%)		(1.17%)		(3.53%)		(3.33%)
Total expenses before Incentive Allocation (in hundredths)	1.37%		1.35%		3.89%		3.93%
Incentive Allocation (in hundredths)	0.00%		0.00%		0.00%		1.00%
Total expenses after Incentive Allocation (in hundredths)	1.37%	[3]	1.35%	[3]	3.89%	[4]	3.94%	[4]
Commission reimbursements (in hundredths)	0.05%		0.12%		0.25%		0.48%
Systematic Strategies Portfolio [Member] | Class 2 Units [Member]
Per unit operating performance
Net asset value per unit, beginning balance (in dollars per units)	$ 73.54		$ 91.69		$ 77.24		$ 99.72
Net income (loss):
Net investment loss (in dollars per unit)	$ (1.31)		$ (1.49)		$ (3.83)		$ (4.73)
Net gain (loss) on investments (in dollars per unit)	$ 0.71		$ (4.90)		$ (0.47)		$ (9.69)
Net loss (in dollars per unit)	$ (0.60)		$ (6.39)		$ (4.30)		$ (14.42)
Net asset value per unit, ending balance (in dollars per unit)	$ 72.94		$ 85.30		$ 72.94		$ 85.30
Ratios to average members' capital and total return [Abstract]
Total return before Incentive Allocation (in hundredths)	(0.82%)		(6.97%)		(5.57%)		(14.45%)
Incentive Allocation (in hundredths)	0.00%		0.00%		0.00%		(1.00%)
Total return after Incentive Allocation (in hundredths)	(0.82%)		(6.97%)		(5.57%)		(14.46%)
Net investment loss before Incentive Allocation (in hundredths)	(1.74%)		(1.63%)		(4.98%)		(4.73%)
Incentive Allocation (in hundredths)	0.00%		0.00%		0.00%		(1.00%)
Net investment loss after Incentive Allocation (in hundredths)	(1.74%)		(1.63%)		(4.98%)		(4.74%)
Total expenses before Incentive Allocation (in hundredths)	1.81%		1.82%		5.33%		5.45%
Incentive Allocation (in hundredths)	0.00%		0.00%		0.00%		1.00%
Total expenses after Incentive Allocation (in hundredths)	1.81%	[3]	1.82%	[3]	5.33%	[4]	5.46%	[4]
Commission reimbursements (in hundredths)	0.05%		0.12%		0.25%		0.48%

[1] The percentages above represent total gross expenses before commission reimbursements (See Note 4), which represent 0.20% of average members' capital for 2012 and 0.20% of average members' capital for 2011.

[2] The percentages above represent total gross expenses before commission reimbursements (See Note 4), which represent 0.70% of average members' capital for 2012 and 0.79% of average members' capital for 2011.

[3] The percentages above represent total gross expenses before commission reimbursements (See Note 4), which represent 0.05% of average members' capital for 2012 and 0.12% of average members' capital for 2011.

[4] The percentages above represent total gross expenses before commission reimbursements (See Note 4), which represent 0.25% of average members' capital for 2012 and 0.48% of average members' capital for 2011.