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Derivative Instruments - Effect of Derivative Instruments on Statements of Income and Expenses (Detail) - USD ($) | 3 Months Ended | 6 Months Ended
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Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024
Derivative Instruments Gain Loss [Line Items] |  |  |  |
Futures contracts, realized gain (loss) | $ (39,319,900) | $ (39,615,424) | $ (43,871,311) | $ (42,185,602)
Futures contracts, unrealized gain (loss) | (21,613,506) | 39,774,667 | 41,269,132 | 93,565,358
Commodity Futures Contract [Member] | Not Designated as Hedging Instrument [Member] |  |  |  |
Derivative Instruments Gain Loss [Line Items] |  |  |  |
Futures contracts, realized gain (loss) | (39,319,900) | (39,615,424) | (43,871,311) | (42,185,602)
Futures contracts, unrealized gain (loss) | (21,613,506) | 39,774,667 | 41,269,132 | 93,565,358
Net Realized and Net Change in Unrealized Gain (Loss) | $ (60,933,406) | $ 159,243 | $ (2,602,179) | $ 51,379,756

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