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Derivative Instruments - Fair Value of Derivative Instruments and 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) $ 112,377,237 $ 32,701,174 $ (31,195,234)
Futures Contracts, Unrealized Gain (Loss) 66,600,560 (8,331,568) (43,963,475)
Commodity Futures Contract [Member] | Not Designated as Hedging Instrument [Member]      
Derivative Instruments Gain Loss [Line Items]      
Futures Contracts, Realized Gain (Loss) 112,377,237 32,701,174 (31,195,234)
Futures Contracts, Unrealized Gain (Loss) 66,600,560 (8,331,568) (43,963,475)
Net Realized and Net Change in Unrealized Gain (Loss) $ 178,977,797 $ 24,369,606 $ (75,158,709)