Statements of Changes in Partners' Capital - USD ($)	Total	General Partner [Member]	Limited Partner [Member]	Class A [Member]	Class A [Member] General Partner [Member]	Class A [Member] Limited Partner [Member]	Class Z [Member]	Class Z [Member] General Partner [Member]
Balance at Dec. 31, 2015	$ 177,818,647			$ 177,818,647
Subscriptions		$ 1,830,458	$ 10,284,141			$ 10,284,141		$ 1,830,458
Redemptions		$ (1,960,458)	$ (29,453,500)		$ (1,910,458)	$ (29,453,500)		$ (50,000)
Net income (loss)	(28,422,518)			(28,179,861)			$ (242,657)
Balance at Dec. 31, 2016	$ 130,096,770			$ 128,558,969			$ 1,537,801
Balance (in units) at Dec. 31, 2015	6,709,418.184			6,709,418.184
Subscriptions (in units)		183,045.785	404,626.316			404,626.316		183,045.785
Balance (in units) at Dec. 31, 2016	6,004,459.334			5,826,676.707			177,782.627
Redemptions (in units)		(79,260.849)	(1,213,370.102)		(73,997.691)	(1,213,370.102)		(5,263.158)
Subscriptions			$ 918,536			$ 918,536
Redemptions		$ (300,000)	$ (22,615,682)			$ (22,615,682)		$ (300,000)
Net income (loss)	$ 4,804,177			$ 4,732,396			$ 71,781
Balance at Dec. 31, 2017	$ 112,903,801			$ 111,594,219			$ 1,309,582
Subscriptions (in units)			42,440.978			42,440.978
Balance (in units) at Dec. 31, 2017	4,964,459.780			4,822,944.482			141,515.298
Redemptions (in units)		(36,267.329)	(1,046,173.203)			(1,046,173.203)		(36,267.329)
Subscriptions		$ 116,187	$ 9,800,783			$ 9,800,783		$ 116,187
Redemptions		$ (150,000)	$ (18,848,006)			$ (18,848,006)		$ (150,000)
Net income (loss)	$ (22,543,077)			$ (22,311,810)			$ (231,267)
Balance at Dec. 31, 2018	$ 81,279,688			$ 80,235,186			$ 1,044,502
Subscriptions (in units)		12,560.802	425,348.852			425,348.852		12,560.802
Balance (in units) at Dec. 31, 2018	4,485,518.450			4,346,874.449			138,644.001
Redemptions (in units)		(15,432.099)	(901,418.885)			(901,418.885)		(15,432.099)