Consolidated Statements of Changes in Members' Capital (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Members' capital, beginning balance	$ 169,981,297	$ 169,187,110
Subscriptions	15,642,137	61,966,160
Redemptions	(66,009,390)	(33,298,897)
Net loss	(11,460,990)	(27,873,076)
Members' capital, ending balance	108,153,054	169,981,297
Blended Strategies Portfolio [Member]
Members' capital, beginning balance	146,634,313	147,900,169
Subscriptions	15,017,858	45,464,226
Redemptions	(58,280,645)	(25,659,106)
Net loss	(9,424,126)	(21,070,976)
Members' capital, ending balance	93,947,400	146,634,313
Blended Strategies Portfolio [Member] | Class 0 Units [Member]
Members' capital, beginning balance	119,087,637	121,701,356
Members' capital, beginning balance (in units)	966,888.461	875,825.668
Subscriptions	12,319,754	35,989,398
Subscriptions (in units)	100,791.035	262,762.860
Redemptions	(48,428,996)	(21,754,496)
Redemptions (in units)	(409,953.926)	(171,700.067)
Net loss	(7,419,872)	(16,848,621)
Members' capital, ending balance	75,558,523	119,087,637
Members' capital, ending balance (in units)	657,725.570	966,888.461
Blended Strategies Portfolio [Member] | Class 2 Units [Member]
Members' capital, beginning balance	27,546,676	26,198,813
Members' capital, beginning balance (in units)	278,890.248	230,452.833
Subscriptions	2,698,104	9,474,828
Subscriptions (in units)	28,261.812	85,057.688
Redemptions	(9,851,649)	(3,904,610)
Redemptions (in units)	(103,494.548)	(36,620.273)
Net loss	(2,004,254)	(4,222,355)
Members' capital, ending balance	18,388,877	27,546,676
Members' capital, ending balance (in units)	203,657.512	278,890.248
Systematic Strategies Portfolio [Member]
Members' capital, beginning balance	23,346,984	21,286,941
Subscriptions	624,279	16,501,934
Redemptions	(7,728,745)	(7,639,791)
Net loss	(2,036,864)	(6,802,100)
Members' capital, ending balance	14,205,654	23,346,984
Systematic Strategies Portfolio [Member] | Class 0 Units [Member]
Members' capital, beginning balance	9,117,153	12,648,247
Members' capital, beginning balance (in units)	112,079.324	122,899.506
Subscriptions	363,279	5,210,859
Subscriptions (in units)	4,452.995	53,326.349
Redemptions	(2,829,387)	(5,765,960)
Redemptions (in units)	(35,843.566)	(64,146.531)
Net loss	(723,398)	(2,975,993)
Members' capital, ending balance	5,927,647	9,117,153
Members' capital, ending balance (in units)	80,688.753	112,079.324
Systematic Strategies Portfolio [Member] | Class 2 Units [Member]
Members' capital, beginning balance	14,229,831	8,638,694
Members' capital, beginning balance (in units)	184,238.954	86,626.635
Subscriptions	261,000	11,291,075
Subscriptions (in units)	3,440.877	118,900.914
Redemptions	(4,899,358)	(1,873,831)
Redemptions (in units)	(66,591.532)	(21,288.595)
Net loss	(1,313,466)	(3,826,107)
Members' capital, ending balance	$ 8,278,007	$ 14,229,831
Members' capital, ending balance (in units)	121,088.299	184,238.954