Statements of Income and Expenses - USD ($)		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Investment Income:
Interest income		$ 1,042,227	$ 1,376,191	$ 447,040
Interest income allocated from the Funds		10,572,228	5,310,193	2,014,179
Total investment income		11,614,455	6,686,384	2,461,219
Expenses:
Expenses allocated from the Funds		5,678,961	5,007,436	7,949,409
Clearing fees related to direct investments (Note 3c)		282,874	798,567	682,545
Ongoing selling agent fees (Notes 3d and 3e)		13,875,364	14,906,992	13,923,750
Management fees (Note 3b)		7,223,233	9,007,592	10,669,966
General Partner fees (Note 3a)		5,437,950	6,652,411	8,098,845
Professional fees		1,489,943	1,713,581	2,271,832
Total expenses		33,988,325	38,086,579	43,596,347
Net investment loss		(22,373,870)	(31,400,195)	(41,135,128)
Net gains (losses) on trading of commodity interests and investment in the Funds:
Net realized gains (losses) on closed contracts		(8,020,735)	923,428	(25,004,534)
Net realized gains (losses) on closed contracts allocated from the Funds		(18,104,021)	(5,736,352)	46,956,695
Net change in unrealized gains (losses) on open contracts		(5,757,588)	2,963,870	2,202,920
Net change in unrealized gains (losses) on open contracts allocated from the Funds		(16,290,205)	8,674	10,976,518
Total trading results		(48,172,549)	(1,840,380)	35,131,599
Net income (loss)		(70,546,419)	(33,240,575)	(6,003,529)
Class A Redeemable Units [Member]
Net gains (losses) on trading of commodity interests and investment in the Funds:
Net income (loss)		$ (69,603,950)	$ (32,973,626)	$ (6,127,946)
Net income (loss) per Redeemable Unit (Note 8)	[1]	$ (279.35)	$ (95.18)	$ (22.20)
Weighted average Redeemable Units outstanding		255,692.4903	304,610.1982	348,898.7336
Class Z Redeemable Units [Member]
Net gains (losses) on trading of commodity interests and investment in the Funds:
Net income (loss)		$ (942,469)	$ (266,949)	$ 124,417
Net income (loss) per Redeemable Unit (Note 8)	[1]	$ (88.75)	$ (17.17)	$ 6.50
Weighted average Redeemable Units outstanding		11,355.4058	12,023.4060	12,872.7303

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