Consolidated Statements of Changes in Members' Capital (Unaudited) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Members' capital, beginning balance	$ 108,153,054	$ 169,981,297
Subscriptions	594,907	3,765,610
Redemptions	(12,646,407)	(10,204,102)
Net income	7,115,496	3,596,110
Members' capital, ending balance	103,217,050	167,138,915
Blended Strategies Portfolio [Member]
Members' capital, beginning balance	93,947,400	146,634,313
Subscriptions	589,907	3,429,610
Redemptions	(9,495,236)	(7,997,325)
Net income	5,923,709	3,378,595
Members' capital, ending balance	90,965,780	145,445,193
Blended Strategies Portfolio [Member] | 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	15,000	2,773,256
Subscriptions (in units)	129.107	22,409.429
Redemptions	(8,193,828)	(6,013,292)
Redemptions (in units)	(68,357.949)	(48,142.859)
Net income	4,813,105	2,868,282
Members' capital, ending balance	72,192,800	118,715,883
Members' capital, ending balance (in units)	589,496.728	941,155.031
Blended Strategies Portfolio [Member] | 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	574,907	656,354
Subscriptions (in units)	6,092.289	6,590.725
Redemptions	(1,301,408)	(1,984,033)
Redemptions (in units)	(13,783.385)	(19,919.494)
Net income	1,110,604	510,313
Members' capital, ending balance	18,772,980	26,729,310
Members' capital, ending balance (in units)	195,966.416	265,561.479
Systematic Strategies Portfolio [Member]
Members' capital, beginning balance	14,205,654	23,346,984
Subscriptions	5,000	336,000
Redemptions	(3,151,171)	(2,206,777)
Net income	1,191,787	217,515
Members' capital, ending balance	12,251,270	21,693,722
Systematic Strategies Portfolio [Member] | Class 0 Units [Member]
Members' capital, beginning balance	5,927,647	9,117,153
Members' capital, beginning balance (in units)	80,688.753	112,079.324
Subscriptions	5,000	236,000
Subscriptions (in units)	67.173	2,895.964
Redemptions	(933,261)	(684,636)
Redemptions (in units)	(12,268.393)	(8,274.643)
Net income	522,083	114,907
Members' capital, ending balance	5,521,469	8,783,424
Members' capital, ending balance (in units)	68,487.533	106,700.645
Systematic Strategies Portfolio [Member] | Class 2 Units [Member]
Members' capital, beginning balance	8,278,007	14,229,831
Members' capital, beginning balance (in units)	121,088.299	184,238.954
Subscriptions	0	100,000
Subscriptions (in units)	0	1,294.902
Redemptions	(2,217,910)	(1,522,141)
Redemptions (in units)	(30,955.635)	(19,527.240)
Net income	669,704	102,608
Members' capital, ending balance	$ 6,729,801	$ 12,910,298
Members' capital, ending balance (in units)	90,132.664	166,006.616