Derivative Instruments - Fair Value of Derivative Instruments (Detail) - Commodity Futures Contract [Member] - Not Designated as Hedging Instrument [Member] - USD ($)		Dec. 31, 2021	Dec. 31, 2020
Derivatives Fair Value [Line Items]
Assets	[1]	$ 877,836	$ 28,341,350
Liabilities	[1]	$ (3,024,948)

[1] Includes cumulative appreciation (depreciation) of commodity futures contracts. Only the current day’s variation margin receivable (payable) is reported in the December 31, 2021 and December 31, 2020 Statements of Financial Condition for non-LME Commodity Futures Contracts.