Statements of Changes in Members' Capital (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Increase (Decrease) in Partners' Capital [Roll Forward]
Members' capital	$ 338,465,469	$ 217,704,321
Subscriptions	111,421,766	135,233,370
Redemptions	(87,981,113)	(22,199,739)
Net income (loss)	(52,021,392)	7,727,517
Members' capital	309,884,730	338,465,469
Blended Strategies Portfolio [Member]
Increase (Decrease) in Partners' Capital [Roll Forward]
Members' capital	290,023,320	187,750,594
Subscriptions	87,250,848	115,273,013
Redemptions	(75,050,692)	(19,271,846)
Net income (loss)	(38,294,358)	6,271,559
Members' capital	263,929,118	290,023,320
Blended Strategies Portfolio [Member] | Class 0 Units [Member]
Increase (Decrease) in Partners' Capital [Roll Forward]
Members' capital	243,511,752	153,850,323
Members' capital (in units)	1,752,436.237	1,134,943.426
Subscriptions	77,766,983	98,736,853
Subscriptions (in units)	565,032.245	727,290.307
Redemptions	(66,038,036)	(14,886,199)
Redemptions (in units)	(503,428.896)	(109,797.496)
Net income (loss)	(31,812,980)	5,810,775
Members' capital	223,427,719	243,511,752
Members' capital (in units)	1,814,039.586	1,752,436.237
Blended Strategies Portfolio [Member] | Class 2 Units [Member]
Increase (Decrease) in Partners' Capital [Roll Forward]
Members' capital	46,511,568	33,900,271
Members' capital (in units)	409,129.824	300,723.739
Subscriptions	9,483,865	16,536,160
Subscriptions (in units)	85,293.740	147,810.091
Redemptions	(9,012,656)	(4,385,647)
Redemptions (in units)	(84,376.133)	(39,404.006)
Net income (loss)	(6,481,378)	460,784
Members' capital	40,501,399	46,511,568
Members' capital (in units)	410,047.431	409,129.824
Systematic Strategies Portfolio [Member]
Increase (Decrease) in Partners' Capital [Roll Forward]
Members' capital	48,442,149	29,953,727
Subscriptions	24,170,918	19,960,357
Redemptions	(12,930,421)	(2,927,893)
Net income (loss)	(13,727,034)	1,455,958
Members' capital	45,955,612	48,442,149
Systematic Strategies Portfolio [Member] | Class 0 Units [Member]
Increase (Decrease) in Partners' Capital [Roll Forward]
Members' capital	28,297,652	18,162,877
Members' capital (in units)	274,960.438	180,564.957
Subscriptions	15,006,260	10,807,501
Subscriptions (in units)	149,857.518	111,304.434
Redemptions	(9,200,929)	(1,672,062)
Redemptions (in units)	(102,061.529)	(16,908.953)
Net income (loss)	(7,848,185)	999,336
Members' capital	26,254,798	28,297,652
Members' capital (in units)	322,756.427	274,960.438
Systematic Strategies Portfolio [Member] | Class 2 Units [Member]
Increase (Decrease) in Partners' Capital [Roll Forward]
Members' capital	20,144,497	11,790,850
Members' capital (in units)	202,003.861	119,035.753
Subscriptions	9,164,658	9,152,856
Subscriptions (in units)	95,481.068	96,254.791
Redemptions	(3,729,492)	(1,255,831)
Redemptions (in units)	(42,411.022)	(13,286.683)
Net income (loss)	(5,878,849)	456,622
Members' capital	$ 19,700,814	$ 20,144,497
Members' capital (in units)	255,073.907	202,003.861