Consolidated Statements of Changes in Partners' Capital (Net Asset Value) (Class A, Class B and Legacy Class) (USD $)	Total	Class A	Class A General Partner	Class A Limited Partners	Class B	Class B General Partner	Class B Limited Partners	Legacy 1 Class	Legacy 1 Class General Partner	Legacy 1 Class Limited Partners	Legacy 2 Class	Legacy 2 Class General Partner	Legacy 2 Class Limited Partners
Partners' capital, (net asset value) at Dec. 31, 2011				$ 41,622,105			$ 460,685,410			$ 4,753,458			$ 14,932,071
Partners' capital, (net asset value) at Dec. 31, 2011	798,842,191
Partners' capital, (net asset value) at Dec. 31, 2011			3,898,734			469,305			935,031			903,063
Partners' capital, (net asset value) (in units) at Dec. 31, 2011				32,119.81			419,169.11			5,210.84			16,534.92
Partners' capital, (net asset value) (in units) at Dec. 31, 2011			3,008.66			427.01			1,025.00			1,000.00
Net asset value per unit at beginning of period (in dollars per unit) at Dec. 31, 2011		$ 1,295.84	$ 1,295.84	$ 1,295.84	$ 1,099.04	$ 1,099.04	$ 1,099.04	$ 912.23	$ 912.23	$ 912.23	$ 903.06	$ 903.06	$ 903.06
Increase (Decrease) in Partners' Capital
Contributions	11,744,429									36,650			548,158
Contributions (in units)										40.15			604.88
Redemptions	(55,662,741)		(650,000)	(2,435,481)		(461,824)	(40,528,157)			(236,856)			(1,224,278)
Redemptions (in units)			(508.88)	(1,883.15)		(427.01)	(36,985.11)			(258.65)			(1,361.65)
Net income (loss)	(10,595,654)		(55,732)	(564,894)		(7,481)	(6,815,993)		(8,106)	(38,590)		(8,359)	(139,178)
Partners' capital, (net asset value) at Mar. 31, 2012				38,621,730			413,341,260			4,514,662			14,116,773
Partners' capital, (net asset value) at Mar. 31, 2012	744,328,225
Partners' capital, (net asset value) at Mar. 31, 2012			3,193,002						926,925			894,704
Partners' capital, (net asset value) (in units) at Mar. 31, 2012				30,236.66			382,184.00			4,992.34			15,778.15
Partners' capital, (net asset value) (in units) at Mar. 31, 2012			2,499.78						1,025.00			1,000.00
Net asset value per unit at end of period (in dollars per unit) at Mar. 31, 2012		$ 1,277.32	$ 1,277.32	$ 1,277.32	$ 1,081.52	$ 1,081.52	$ 1,081.52	$ 904.32	$ 904.32	$ 904.32	$ 894.70	$ 894.70	$ 894.70
Partners' capital, (net asset value) at Dec. 31, 2012		31,269,640		31,269,640	330,303,791		330,303,791	3,851,016		3,851,016	11,061,307		11,061,307
Partners' capital, (net asset value) at Dec. 31, 2012	636,740,050
Partners' capital, (net asset value) at Dec. 31, 2012		3,040,653	3,040,653					897,998	897,998		864,602	864,602
Partners' capital, (net asset value) (in units) at Dec. 31, 2012		25,707.33		25,707.33	322,257.31		322,257.31	4,395.66		4,395.66	12,793.52		12,793.52
Partners' capital, (net asset value) (in units) at Dec. 31, 2012		2,499.78	2,499.78					1,025.00	1,025.00		1,000.00	1,000.00
Net asset value per unit at beginning of period (in dollars per unit) at Dec. 31, 2012		$ 1,216.37	$ 1,216.37	$ 1,216.37	$ 1,024.97	$ 1,024.97	$ 1,024.97	$ 876.10	$ 876.10	$ 876.10	$ 864.60	$ 864.60	$ 864.60
Increase (Decrease) in Partners' Capital
Contributions	8,974,962												145,000
Contributions (in units)													167.25
Redemptions	(40,937,987)			(2,119,964)			(21,551,259)			(353,575)			(1,409,381)
Redemptions (in units)				(1,742.28)			(21,069.99)			(401.29)			(1,632.47)
Net income (loss)	(1,156,755)		(6,942)	(65,848)			(1,220,170)		2,932	13,435		2,363	24,313
Partners' capital, (net asset value) at Mar. 31, 2013		29,083,828		29,083,828	307,532,362		307,532,362	3,510,876		3,510,876	9,821,239		9,821,239
Partners' capital, (net asset value) at Mar. 31, 2013	603,620,270
Partners' capital, (net asset value) at Mar. 31, 2013		$ 3,033,711	$ 3,033,711					$ 900,930	$ 900,930		$ 866,965	$ 866,965
Partners' capital, (net asset value) (in units) at Mar. 31, 2013		23,965.05		23,965.05	301,187.32		301,187.32	3,994.37		3,994.37	11,328.30		11,328.30
Partners' capital, (net asset value) (in units) at Mar. 31, 2013		2,499.78	2,499.78					1,025.00	1,025.00		1,000.00	1,000.00
Net asset value per unit at end of period (in dollars per unit) at Mar. 31, 2013		$ 1,213.59	$ 1,213.59	$ 1,213.59	$ 1,021.07	$ 1,021.07	$ 1,021.07	$ 878.96	$ 878.96	$ 878.96	$ 866.97	$ 866.97	$ 866.97