Derivative Instruments - Effect of Derivative Instruments on Statements of Income and Expenses (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Derivative Instruments Gain Loss [Line Items]
Futures contracts, realized gain (loss)	$ (39,615,424)	$ (145,076,467)	$ (42,185,602)	$ (215,376,363)
Futures contracts, unrealized gain (loss)	39,774,667	28,939,549	93,565,358	(18,704,010)
Commodity Futures Contract [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments Gain Loss [Line Items]
Futures contracts, realized gain (loss)	(39,615,424)	(145,076,467)	(42,185,602)	(215,376,363)
Futures contracts, unrealized gain (loss)	39,774,667	28,939,549	93,565,358	(18,704,010)
Net Realized and Net Change in Unrealized Gain (Loss)	$ 159,243	$ (116,136,918)	$ 51,379,756	$ (234,080,373)