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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) $ (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