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Additional Valuation Information - Summary of the Tiered Valuation Input Levels (Detail) - USD ($)
Mar. 31, 2022
Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
United States Treasury Obligations $ 159,768,577 $ 92,006,259
Exchange-Traded Fund 49,819,600 49,855,000
Money Market Mutual Fund 730,191,695 576,603,758
Total Investments in Securities 939,779,872 718,465,017
Commodity Futures Contracts, Unrealized Appreciation (Depreciation) (2,099,703) (4,284,830)
Total Investments 937,680,169 714,180,187
Level 1 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Exchange-Traded Fund 49,819,600 49,855,000
Money Market Mutual Fund 730,191,695 576,603,758
Total Investments in Securities 780,011,295 626,458,758
Commodity Futures Contracts, Unrealized Appreciation (Depreciation) (2,099,703) (4,284,830)
Total Investments 777,911,592 622,173,928
Level 2 [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
United States Treasury Obligations 159,768,577 92,006,259
Total Investments in Securities 159,768,577 92,006,259
Total Investments $ 159,768,577 $ 92,006,259