Derivative Instruments - Effect of Derivative Instruments on Statements of Income and Expenses (Detail) - Currency Futures Contracts [Member] - Not Designated as Hedging Instrument [Member] - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Derivative Instruments, Gain (Loss) [Line Items]
Futures contracts, realized gain (loss)	$ (936,900)	$ (9,975,184)	$ (25,007,032)	$ 165,805
Futures contracts, unrealized gain (loss)	3,495,777	(5,548,181)	(7,042,466)	2,611,563
Future Contracts, Net Realized and Unrealized Gain (Loss)	$ 2,558,877	$ (15,523,365)	$ (32,049,498)	$ 2,777,368