Consolidated Statements of Changes in Members' Capital (Unaudited) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Members' capital, beginning balance			$ 93,947,400	$ 146,634,313
Subscriptions			1,100,551	5,679,108
Redemptions			(15,035,392)	(23,267,323)
Net (income) loss	(1,019,957)	(8,123,273)	4,903,752	(4,744,679)
Members' capital, ending balance	84,916,311	124,301,419	84,916,311	124,301,419
Class 0 Units [Member]
Members' capital, beginning balance			75,558,523	119,087,637
Members' capital, beginning balance (in units)			657,725.570	966,888.461
Subscriptions			370,000	4,438,754
Subscriptions (in units)			3,000.060	35,712.731
Redemptions			(13,524,675)	(17,960,339)
Redemptions (in units)			(111,776.539)	(144,603.626)
Net (income) loss			4,091,927	(3,663,340)
Members' capital, ending balance	66,495,775	101,902,712	66,495,775	101,902,712
Members' capital, ending balance (in units)	548,949.091	857,997.566	548,949.091	857,997.566
Class 2 Units [Member]
Members' capital, beginning balance			18,388,877	27,546,676
Members' capital, beginning balance (in units)			203,657.512	278,890.248
Subscriptions			730,551	1,240,354
Subscriptions (in units)			7,672.954	12,429.917
Redemptions			(1,510,717)	(5,306,984)
Redemptions (in units)			(15,953.583)	(53,790.179)
Net (income) loss			811,825	(1,081,339)
Members' capital, ending balance	$ 18,420,536	$ 22,398,707	$ 18,420,536	$ 22,398,707
Members' capital, ending balance (in units)	195,376.883	237,529.986	195,376.883	237,529.986