Consolidated Statement of Changes in Unitholders' Capital (USD $)	3 Months Ended	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2012
Beginning Balances		$ 34,952,207
Trading income (loss)	(1,186,208)	(4,106,849)
Ending Balances	25,395,324	25,395,324
Trading [Member]
Beginning Balances (in units)		369,090
Transfers (in units)		(3)
Unitholders' contributions (in units)		1,574
Unitholders' redemptions (in units)		(64,992)
Ending Balances (in units)	305,669	305,669
Beginning Balances		33,777,543
Trading income (loss)		(6,337,773)
Transfers
Unitholders' contributions		137,436
Unitholders' redemptions		5,587,470
Ending Balances	24,595,446	24,595,446
Trading [Member] | Class A [Member]
Net Asset Value Per Unit-Beginning Balance		$ 91.32
Net change per unit	$ (3.67)	$ (11.06)
Net Asset Value Per Unit-Ending Balance	$ 80.26	$ 80.26
Trading [Member] | Class B [Member]
Net Asset Value Per Unit-Beginning Balance		$ 96.98
Net change per unit	$ (3.51)	$ (10.46)
Net Asset Value Per Unit-Ending Balance	$ 86.52	$ 86.52
Trading [Member] | Beneficial Owners [Member] | Class A [Member]
Beginning Balances (in units)		355,858
Transfers (in units)		(52)
Unitholders' contributions (in units)		1,574
Unitholders' redemptions (in units)		(62,313)
Ending Balances (in units)	295,067	295,067
Beginning Balances		32,497,392
Trading income (loss)		(3,610,621)
Transfers		(4,404)
Unitholders' contributions		137,436
Unitholders' redemptions		(5,538,276)
Ending Balances	23,681,527	23,681,527
Trading [Member] | Beneficial Owners [Member] | Class B [Member]
Beginning Balances (in units)		12,697
Transfers (in units)		49
Unitholders' contributions (in units)
Unitholders' redemptions (in units)		(2,679)
Ending Balances (in units)	10,067	10,067
Beginning Balances		1,231,294
Trading income (loss)		(115,525)
Transfers		4,404
Unitholders' contributions
Unitholders' redemptions		(249,194)
Ending Balances	870,979	870,979
Trading [Member] | Managing Owner [Member] | Class A [Member]
Beginning Balances (in units)		535
Transfers (in units)
Unitholders' contributions (in units)
Unitholders' redemptions (in units)
Ending Balances (in units)	535	535
Beginning Balances		48,857
Trading income (loss)		(5,917)
Transfers
Unitholders' contributions
Unitholders' redemptions
Ending Balances	42,940	42,940
LLC Equity/Non-Trading [Member]
Beginning Balances (in units)		2,273,288
Unitholders' redemptions (in units)
Ending Balances (in units)	2,273,288	2,273,288
Beginning Balances		1,174,664
Trading income (loss)		(689,716)
Unitholders' redemptions
Ending Balances	859,734	859,734
Net Asset Value Per Unit-Beginning Balance		$ 0.52
Net change per unit		$ (0.17)
Net Asset Value Per Unit-Ending Balance	$ 0.35	$ 0.35
LLC Equity/Non-Trading [Member] | Participating Owners [Member]
Beginning Balances (in units)		306,807
Unitholders' redemptions (in units)		(51,831)
Ending Balances (in units)	254,976	254,976
Beginning Balances		158,535
Trading income (loss)		(47,804)
Unitholders' redemptions		21,015
Ending Balances	89,716	89,716
LLC Equity/Non-Trading [Member] | Nonparticipating Owners [Member]
Beginning Balances (in units)		1,966,481
Unitholders' redemptions (in units)		51,831
Ending Balances (in units)	2,018,312	2,018,312
Beginning Balances		1,016,129
Trading income (loss)		(326,982)
Unitholders' redemptions		(21,015)
Ending Balances	$ 710,162	$ 710,162