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)	$ (56,339,164)	$ (248,497,488)	$ 732,359,785
Futures contracts, unrealized gain (loss)	9,981,798	5,796,728	(199,728,345)
Commodity Futures Contract [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments Gain Loss [Line Items]
Futures contracts, realized gain (loss)	(56,339,164)	(248,497,488)	732,359,785
Futures contracts, unrealized gain (loss)	9,981,798	5,796,728	(199,728,345)
Net Realized and Net Change in Unrealized Gain (Loss)	$ (46,357,366)	$ (242,700,760)	$ 532,631,440