Consolidated Statement of Changes in Unitholders' Capital (USD $)	3 Months Ended
	Mar. 31, 2013
Unitholders' contributions (in units)	135,840
Beginning Balances	$ 23,250,458
Trading income (loss)	(412,464)
Unitholders' contributions	12,457,447
Ending Balances	21,518,979
Trading [Member]
Beginning Balances (in units)	283,041
Unitholders' contributions (in units)
Unitholders' redemptions (in units)	(17,078)
Transfer from Class A to Class B (in units)	(2)
Ending Balances (in units)	265,961
Beginning Balances	21,823,370
Trading income (loss)	(301,769)
Unitholders' contributions
Unitholders' redemptions	(1,319,015)
Transfer from Class A to Class B
Ending Balances	20,202,586
Trading [Member] | Class A [Member]
Net Asset Value Per Unit-Beginning Balance	$ 76.92
Net change per unit	$ (1.12)
Net Asset Value Per Unit-Ending Balance	$ 75.80
Trading [Member] | Class B [Member]
Net Asset Value Per Unit-Beginning Balance	$ 83.34
Net change per unit	$ (0.81)
Net Asset Value Per Unit-Ending Balance	$ 82.53
Trading [Member] | Beneficial Owners [Member] | Class A [Member]
Beginning Balances (in units)	274,403
Unitholders' contributions (in units)
Unitholders' redemptions (in units)	(15,176)
Transfer from Class A to Class B (in units)	(24)
Ending Balances (in units)	259,203
Beginning Balances	21,106,894
Trading income (loss)	(294,923)
Unitholders' contributions
Unitholders' redemptions	(1,161,686)
Transfer from Class A to Class B	(1,832)
Ending Balances	19,648,453
Trading [Member] | Beneficial Owners [Member] | Class B [Member]
Beginning Balances (in units)	8,103
Unitholders' contributions (in units)
Unitholders' redemptions (in units)	(1,902)
Transfer from Class A to Class B (in units)	22
Ending Balances (in units)	6,223
Beginning Balances	675,323
Trading income (loss)	(6,248)
Unitholders' contributions
Unitholders' redemptions	(157,329)
Transfer from Class A to Class B	1,832
Ending Balances	513,578
Trading [Member] | Managing Owner [Member] | Class A [Member]
Beginning Balances (in units)	535
Unitholders' contributions (in units)
Unitholders' redemptions (in units)
Transfer from Class A to Class B (in units)
Ending Balances (in units)	535
Beginning Balances	41,153
Trading income (loss)	(598)
Unitholders' contributions
Unitholders' redemptions
Transfer from Class A to Class B
Ending Balances	40,555
LLC Equity/Non-Trading [Member]
Beginning Balances (in units)	2,273,288
Unitholders' redemptions (in units)
Ending Balances (in units)	2,273,288
Beginning Balances	1,427,088
Trading income (loss)	(110,695)
Unitholders' redemptions
Ending Balances	1,316,393
Net Asset Value Per Unit-Beginning Balance	$ 0.63
Net change per unit	$ (0.05)
Net Asset Value Per Unit-Ending Balance	$ 0.58
LLC Equity/Non-Trading [Member] | Participating Owners [Member]
Beginning Balances (in units)	237,663
Unitholders' redemptions (in units)	(11,662)
Ending Balances (in units)	226,001
Beginning Balances	149,728
Trading income (loss)	(11,942)
Unitholders' redemptions	(6,764)
Ending Balances	131,022
LLC Equity/Non-Trading [Member] | Nonparticipating Owners [Member]
Beginning Balances (in units)	2,035,625
Unitholders' redemptions (in units)	11,662
Ending Balances (in units)	2,047,287
Beginning Balances	1,277,360
Trading income (loss)	(98,753)
Unitholders' redemptions	6,764
Ending Balances	$ 1,185,371