Financial Highlights (Details) - Schedule of Finanacial Highlights (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Capital Unit, Class A [Member]
Per share operating performance:
Net asset value of Trading units, beginning of period (in Dollars per share)	$ 75.80	$ 86.37	$ 76.92	$ 91.32
Total Trading income (loss):
Trading gain (loss) (in Dollars per share)	$ (1.54)	$ (0.71)	$ (0.98)	$ (3.86)
Investment income (in Dollars per share)	$ 0.01	$ 0.08	$ 0.06	$ 0.22
Expenses (in Dollars per share)	$ (1.72)	$ (1.81)	$ (3.45)	$ (3.75)
Trading income (loss) (in Dollars per share)	$ (3.25)	$ (2.44)	$ (4.37)	$ (7.39)
Net asset value of Trading units, end of period (in Dollars per share)	$ 72.55	$ 83.93	$ 72.55	$ 83.93
Total return:
Total return before incentive fees	(4.30%)	(2.81%)	(5.68%)	(8.09%)
Less incentive fee allocations	0.00%	(0.02%)	0.00%	(0.01%)
Total return	(4.30%)	(2.83%)	(5.68%)	(8.10%)
Ratios to average net assets:
Trading income (loss)	(4.42%)	(0.75%)	(5.72%)	(4.51%)
Expenses:
Expenses, less incentive fees	(2.34%)	(2.13%)	(4.62%)	(4.34%)
Incentive fees	0.00%	(0.02%)	0.00%	(0.01%)
Total expenses	(2.34%)	(2.15%)	(4.62%)	(4.35%)
Capital Unit, Class B [Member]
Per share operating performance:
Net asset value of Trading units, beginning of period (in Dollars per share)	$ 82.53	$ 92.18	$ 83.34	$ 96.98
Total Trading income (loss):
Trading gain (loss) (in Dollars per share)	$ (1.68)	$ (0.76)	$ (1.07)	$ (4.11)
Investment income (in Dollars per share)	$ 0.00	$ 0.09	$ 0.06	$ 0.23
Expenses (in Dollars per share)	$ (1.47)	$ (1.48)	$ (2.95)	$ (3.07)
Trading income (loss) (in Dollars per share)	$ (3.15)	$ (2.15)	$ (3.96)	$ (6.95)
Net asset value of Trading units, end of period (in Dollars per share)	$ 79.38	$ 90.03	$ 79.38	$ 90.03
Total return:
Total return before incentive fees	(3.81%)	(2.32%)	(4.75%)	(7.14%)
Less incentive fee allocations	0.00%	(0.02%)	0.00%	(0.02%)
Total return	(3.81%)	(2.34%)	(4.75%)	(7.16%)
Ratios to average net assets:
Trading income (loss)	(3.90%)	(0.64%)	(4.49%)	(4.48%)
Expenses:
Expenses, less incentive fees	(1.83%)	(1.62%)	(3.67%)	(3.33%)
Incentive fees	0.00%	(0.02%)	0.00%	(0.02%)
Total expenses	(1.83%)	(1.64%)	(3.67%)	(3.35%)