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Derivative Instruments - Effect of Derivative Instruments on Statements of Income and Expenses (Detail) - USD ($)
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Derivative Instruments Gain Loss [Line Items]      
Futures contracts, realized gain (loss) $ 38,573,595 $ 7,541,558 $ (12,223,418)
Futures Contracts, Net Unrealized Gain (Loss) (9,243,523) (2,765,154) 8,296,896
Commodity Futures Contract [Member] | Not Designated as Hedging Instrument [Member]      
Derivative Instruments Gain Loss [Line Items]      
Futures contracts, realized gain (loss) 38,573,595 7,541,558 (12,223,418)
Futures Contracts, Net Unrealized Gain (Loss) (9,243,523) (2,765,154) 8,296,896
Future Contracts, Net Realized and Unrealized Gain (Loss) $ 29,330,072 $ 4,776,404 $ (3,926,522)