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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
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Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Derivative Instruments Gain (Loss) [Line Items] |  |  |  |
Futures contracts, realized gain (loss) | $ 551,717 | $ 1,532,903 | $ 5,929,685 | $ (202,691)
Futures contracts, unrealized gain (loss) | (2,622,253) | 823,753 | 671,935 | (602,564)
Future Contracts, Net Realized and Unrealized Gain (Loss) | $ (2,070,536) | $ 2,356,656 | $ 6,601,620 | $ (805,255)

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