Derivative Instruments - Effect of Derivative Instruments on Statements of Income and Expenses (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Derivative Instruments, Gain (Loss) [Line Items]
Futures Contracts, Net Realized Gain (Loss)	$ (127,294)	$ (118,398)
Futures Contracts, Net Unrealized Gain (Loss)	(1,129,584)	(531,434)
Currency Futures Contract [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Futures Contracts, Net Realized Gain (Loss)	(127,294)	(118,398)
Futures Contracts, Net Unrealized Gain (Loss)	(1,129,584)	(531,434)
Future Contracts, Net Realized and Unrealized Gain (Loss)	$ (1,256,878)	$ (649,832)