Statements of Income and Expenses - USD ($)		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Investment Income:
Interest income		$ 1,376,893	$ 767,410	$ 355,476
Expenses:
Administrative and General Partner's fees (Note 2i)		2,132,770	2,326,881	3,271,543
Ongoing placement agent fees (Note 2j)		2,108,440	2,299,967	3,254,390
Management fees (Note 3)		1,866,172	2,036,022	2,862,598
Total expenses		6,107,382	6,662,870	9,388,531
Net investment loss		(4,730,489)	(5,895,460)	(9,033,055)
Net gains (losses) on trading of commodity interests:
Net realized gains (losses) on closed contracts		(10,660,546)	7,703,605	(19,188,851)
Net change in unrealized gains (losses) on open contracts		(7,152,042)	2,996,032	(200,612)
Total trading results		(17,812,588)	10,699,637	(19,389,463)
Net income (loss)		(22,543,077)	4,804,177	(28,422,518)
Class A [Member]
Net gains (losses) on trading of commodity interests:
Net income (loss)		$ (22,311,810)	$ 4,732,396	$ (28,179,861)
Net income (loss) per Unit (Note 7):
Net income (loss) per unit	[1]	$ (4.68)	$ 1.08	$ (4.44)
Weighted average Units outstanding:
Weighted average units outstanding		4,886,957.150	5,362,124.118	6,492,012.518
Class Z [Member]
Net gains (losses) on trading of commodity interests:
Net income (loss)		$ (231,267)	$ 71,781	$ (242,657)
Net income (loss) per Unit (Note 7):
Net income (loss) per unit	[1]	$ (1.72)	$ 0.60	$ (1.35)
Weighted average Units outstanding:
Weighted average units outstanding		139,930.009	158,440.533	180,414.206

[1] Represents the change in net asset value per Unit.