Derivative Instruments - Effect of Derivative Instruments on Statements of Income and Expenses (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Derivative Instruments Gain Loss [Line Items]
Futures contracts, realized gain (loss)	$ (248,497,488)	$ 732,359,785	$ 663,176,025
Futures contracts, unrealized gain (loss)	5,796,728	(199,728,345)	14,525,333
Commodity Futures Contract [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments Gain Loss [Line Items]
Futures contracts, realized gain (loss)	(248,497,488)	732,359,785	663,176,025
Futures contracts, unrealized gain (loss)	5,796,728	(199,728,345)	14,525,333
Net Realized and Net Change in Unrealized Gain (Loss)	$ (242,700,760)	$ 532,631,440	$ 677,701,358