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Derivative Instruments - Effect of Derivative Instruments on Statements of Income and Expenses (Detail) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Derivative Instruments, Gain (Loss) [Line Items]        
Futures contracts, realized gain (loss) $ 400,416 $ 1,847,279 $ 433,121 $ 1,730,911
Futures contracts, unrealized gain (loss) (15,790,205) (575,543) (14,774,223) 23,639,108
Commodity Futures Contract [Member] | Not Designated as Hedging Instrument [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Futures contracts, realized gain (loss) 400,416 1,847,279 433,121 1,730,911
Futures contracts, unrealized gain (loss) (15,790,205) (575,543) (14,774,223) 23,639,108
Net realized and net change in unrealized gain (loss) $ (15,389,789) $ 1,271,736 $ (14,341,102) $ 25,370,019