Statements of Income and Expenses - USD ($)		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Investment Income:
Interest income		$ 719,779
Interest income allocated from the Fund(s)		394,826	$ 727,298	$ 233,243
Total investment income		1,114,605	727,298	233,243
Expenses:
Expenses allocated from the Fund(s)		318,864	1,273,261	2,366,798
Clearing fees related to direct investments		497,270
Ongoing selling agent fees		1,312,283	1,859,839	2,389,918
Management fees		1,026,535	1,171,819	1,488,211
General Partner fees		662,607	937,457	1,190,569
Incentive fees		1,017,644
Professional fees		351,346	367,567	422,490
Total expenses		5,186,549	5,609,943	7,857,986
Net investment loss		(4,071,944)	(4,882,645)	(7,624,743)
Net gains (losses) on trading of commodity interests and investment in the Fund(s):
Net realized gains (losses) on closed contracts		4,886,607
Net realized gains (losses) on closed contracts allocated from the Fund(s)		(113,328)	704,058	14,272,175
Net change in unrealized gains (losses) on open contracts		1,238,838
Net change in unrealized gains (losses) on open contracts allocated from the Fund(s)		(94,059)	(867,058)	(272,777)
Total trading results		5,918,058	(163,000)	13,999,398
Net income (loss)		1,846,114	(5,045,645)	6,374,655
Class A [Member]
Net gains (losses) on trading of commodity interests and investment in the Fund(s):
Net income (loss)		$ 1,803,774	$ (5,007,550)	$ 6,374,655
Net income (loss) per Redeemable Unit	[1]	$ 35.02	$ (70.06)	$ 67.32
Weighted average Redeemable Units outstanding		50,108.3523	71,151.3143	89,440.9985
Class D [Member]
Net gains (losses) on trading of commodity interests and investment in the Fund(s):
Net income (loss)		$ 6,507
Net income (loss) per Redeemable Unit	[1],[2]	$ 10.75
Weighted average Redeemable Units outstanding	[2]	583.3817
Class Z [Member]
Net gains (losses) on trading of commodity interests and investment in the Fund(s):
Net income (loss)		$ 35,833	$ (38,095)
Net income (loss) per Redeemable Unit	[1]	$ 47.07	$ (33.24)
Weighted average Redeemable Units outstanding		757.7553	1,159.9809

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

[2] From July 1, 2018, the date Class D Redeemable Units were first issued, to December 31, 2018.