Derivative Instruments - Fair Value of Derivative Instruments (Details) - USD ($)	9 Months Ended	12 Months Ended
	Sep. 30, 2017	Dec. 31, 2016
Fair Values of Derivative Instruments
Asset Derivatives	$ 6,278,494	$ 6,127,320
Liability Derivatives	$ (6,633,079)	$ (4,581,389)
Agriculturals | Deutsche Bank Total Return Swap Terminating March 29, 2019
Fair Values of Derivative Instruments
Sector exposure index	2.00%	3.00%
Energy | Deutsche Bank Total Return Swap Terminating March 29, 2019
Fair Values of Derivative Instruments
Sector exposure index	1.00%	1.00%
Interest rates | Deutsche Bank Total Return Swap Terminating March 29, 2019
Fair Values of Derivative Instruments
Sector exposure index	62.00%	53.00%
Interest rates | Deutsche Bank Total Return Swap Terminating July 1, 2020
Fair Values of Derivative Instruments
Sector exposure index	42.00%	61.00%
Metals | Deutsche Bank Total Return Swap Terminating March 29, 2019
Fair Values of Derivative Instruments
Sector exposure index	1.00%	3.00%
Stock indices | Deutsche Bank Total Return Swap Terminating March 29, 2019
Fair Values of Derivative Instruments
Sector exposure index	16.00%	15.00%
Stock indices | Deutsche Bank Total Return Swap Terminating July 1, 2020
Fair Values of Derivative Instruments
Sector exposure index	12.00%	10.00%
Futures Contracts
Fair Values of Derivative Instruments
Asset Derivatives	$ 4,018,670	$ 5,166,127
Liability Derivatives	(3,721,417)	(2,886,203)
Fair Value	297,253	2,279,924
Futures Contracts | Agriculturals
Fair Values of Derivative Instruments
Asset Derivatives	112,923	121,013
Liability Derivatives	(188,652)	(261,721)
Fair Value	(75,729)	(140,708)
Futures Contracts | Currencies
Fair Values of Derivative Instruments
Asset Derivatives	219,197	763,565
Liability Derivatives	(661,793)	(345,781)
Fair Value	(442,596)	417,784
Futures Contracts | Energy
Fair Values of Derivative Instruments
Asset Derivatives	340,682	562,341
Liability Derivatives	(312,947)	(18,461)
Fair Value	27,735	543,880
Futures Contracts | Interest rates
Fair Values of Derivative Instruments
Asset Derivatives	485,531	578,244
Liability Derivatives	(950,806)	(326,726)
Fair Value	(465,275)	251,518
Futures Contracts | Meats
Fair Values of Derivative Instruments
Asset Derivatives	49,816	79,821
Liability Derivatives	(58,162)	(10,487)
Fair Value	(8,346)	69,334
Futures Contracts | Metals
Fair Values of Derivative Instruments
Asset Derivatives	949,761	1,604,965
Liability Derivatives	(939,436)	(1,282,731)
Fair Value	10,325	322,234
Futures Contracts | Soft commodities
Fair Values of Derivative Instruments
Asset Derivatives	189,249	344,652
Liability Derivatives	(37,859)	(86,579)
Fair Value	151,390	258,073
Futures Contracts | Stock indices
Fair Values of Derivative Instruments
Asset Derivatives	1,671,511	1,111,526
Liability Derivatives	(571,762)	(553,717)
Fair Value	1,099,749	557,809
Forward Contracts
Fair Values of Derivative Instruments
Fair Value	(514,397)	705
Forward Contracts | Currencies
Fair Values of Derivative Instruments
Asset Derivatives	426,813	556,627
Liability Derivatives	(941,210)	(555,922)
Fair Value	$ (514,397)	$ 705
Forward Contracts | Currencies | Deutsche Bank Total Return Swap Terminating March 29, 2019
Fair Values of Derivative Instruments
Sector exposure index	18.00%	25.00%
Forward Contracts | Currencies | Deutsche Bank Total Return Swap Terminating July 1, 2020
Fair Values of Derivative Instruments
Sector exposure index	46.00%	29.00%
Swap Contracts
Fair Values of Derivative Instruments
Asset Derivatives	$ 1,833,011	$ 404,566
Liability Derivatives	(1,970,452)	(1,139,264)
Fair Value	$ (137,441)	$ (734,698)
Swap Contracts | Deutsche Bank Total Return Swap Terminating March 29, 2019
Fair Values of Derivative Instruments
Sector exposure index	100.00%	100.00%
Swap Contracts | Deutsche Bank Total Return Swap Terminating July 1, 2020
Fair Values of Derivative Instruments
Sector exposure index	100.00%	100.00%