Consolidated Statements of Changes in Members' Capital (Unaudited) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Members' capital, beginning balance	$ 78,546,247	$ 76,659,546
Subscriptions	734,544	1,462,800
Redemptions	(832,281)	(3,904,278)
Net income (loss)	5,476,983	(8,384,583)
Members' capital, ending balance	83,925,493	65,833,485
Class 0 Units [Member]
Members' capital, beginning balance	58,300,841	58,310,022
Members' capital, beginning balance (in units)	390,307.769	456,544.588
Subscriptions	377,644	160,000
Subscriptions (in units)	2,418.637	1,320.227
Redemptions	(107,801)	(2,991,103)
Redemptions (in units)	(676.320)	(25,972.022)
Net income (loss)	4,129,634	(6,231,099)
Members' capital, ending balance	62,700,318	49,247,820
Members' capital, ending balance (in units)	392,050.086	431,892.793
Class 2 Units [Member]
Members' capital, beginning balance	20,245,406	18,349,524
Members' capital, beginning balance (in units)	178,245.791	186,461.512
Subscriptions	356,900	1,302,800
Subscriptions (in units)	2,990.196	13,404.463
Redemptions	(724,480)	(913,175)
Redemptions (in units)	(5,999.518)	(10,154.220)
Net income (loss)	1,347,349	(2,153,484)
Members' capital, ending balance	$ 21,225,175	$ 16,585,665
Members' capital, ending balance (in units)	175,236.469	189,711.755