Additional Valuation Information - Summary of the Tiered Valuation Input Levels (Detail) - USD ($)	Jun. 30, 2021	Dec. 31, 2020
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
United States Treasury Obligations	$ 35,996,595	$ 54,989,124
Exchange-Traded Fund	17,435,550	17,435,550
Money Market Mutual Fund	69,105,035	68,605,719
Total Investments in Securities	122,537,180	141,030,393
Commodity Futures Contracts, Depreciation	(7,351,216)
Total Investments	115,185,964	169,371,743
Commodity Futures Contracts		28,341,350
Level 1 [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Exchange-Traded Fund	17,435,550	17,435,550
Money Market Mutual Fund	69,105,035	68,605,719
Total Investments in Securities	86,540,585	86,041,269
Commodity Futures Contracts, Depreciation	(7,351,216)
Total Investments	79,189,369	114,382,619
Commodity Futures Contracts		28,341,350
Level 2 [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
United States Treasury Obligations	35,996,595	54,989,124
Total Investments in Securities	35,996,595	54,989,124
Total Investments	$ 35,996,595	$ 54,989,124