Derivative Instruments - Effect of Derivatives on Statement of Operations (Details)	3 Months Ended
	Mar. 31, 2020 USD ($) instrument	Mar. 31, 2019 USD ($) instrument
Derivative Instruments
Rarely exceeded margin-to-equity ratio (as a percent)	25.00%
Futures, Forward, and Swap Contracts
Effect of Derivative Instruments on the Consolidated Statement of Operations
Gains (losses) on derivatives instruments	$ (8,160,727)	$ 2,053,502
Futures Contracts
Derivative Instruments
Monthly average number of derivative instruments bought and sold | instrument	4,747	10,966
Effect of Derivative Instruments on the Consolidated Statement of Operations
Gains (losses) on derivatives instruments	$ (296,536)	$ 2,248,065
Futures Contracts | Agriculturals
Effect of Derivative Instruments on the Consolidated Statement of Operations
Gains (losses) on derivatives instruments	171,033	116,879
Futures Contracts | Currencies
Effect of Derivative Instruments on the Consolidated Statement of Operations
Gains (losses) on derivatives instruments	427,509	(506,183)
Futures Contracts | Energy
Effect of Derivative Instruments on the Consolidated Statement of Operations
Gains (losses) on derivatives instruments	568,697	(578,242)
Futures Contracts | Interest rates
Effect of Derivative Instruments on the Consolidated Statement of Operations
Gains (losses) on derivatives instruments	1,857,269	3,077,891
Futures Contracts | Meats
Effect of Derivative Instruments on the Consolidated Statement of Operations
Gains (losses) on derivatives instruments	143,671	(26,149)
Futures Contracts | Metals
Effect of Derivative Instruments on the Consolidated Statement of Operations
Gains (losses) on derivatives instruments	351,036	(253,345)
Futures Contracts | Soft commodities
Effect of Derivative Instruments on the Consolidated Statement of Operations
Gains (losses) on derivatives instruments	2,287	(162,505)
Futures Contracts | Stock indices
Effect of Derivative Instruments on the Consolidated Statement of Operations
Gains (losses) on derivatives instruments	$ (3,818,038)	$ 579,719
Forward Contracts
Derivative Instruments
Monthly average number of derivative instruments bought and sold | instrument	397	431
Effect of Derivative Instruments on the Consolidated Statement of Operations
Gains (losses) on derivatives instruments	$ 244,864	$ 36,355
Forward Contracts | Currencies
Effect of Derivative Instruments on the Consolidated Statement of Operations
Gains (losses) on derivatives instruments	244,864	36,355
Swap Contracts
Effect of Derivative Instruments on the Consolidated Statement of Operations
Gains (losses) on derivatives instruments	$ (8,109,055)	$ (230,918)