Additional Valuation Information - Summary of the Tiered Valuation Input Levels (Detail) - USD ($)	Mar. 31, 2020	Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
United States Treasury Obligations	$ 144,986,212	$ 147,718,751
Exchange-Traded Fund	79,610,643	79,123,338
Money Market Mutual Fund	65,164,373	120,898,494
Total Investments in Securities	289,761,228	347,740,583
Commodity Futures Contracts, Appreciation	7,231,244	13,955,785
Commodity Futures Contracts, Depreciation	(36,238,219)	(2,202,345)
Commodity Futures Contracts	(29,006,975)	11,753,440
Total Investments	260,754,253	359,494,023
Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Exchange-Traded Fund	79,610,643	79,123,338
Money Market Mutual Fund	65,164,373	120,898,494
Total Investments in Securities	144,775,016	200,021,832
Commodity Futures Contracts, Appreciation	7,231,244	13,955,785
Commodity Futures Contracts, Depreciation	(36,238,219)	(2,202,345)
Commodity Futures Contracts	(29,006,975)	11,753,440
Total Investments	115,768,041	211,775,272
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
United States Treasury Obligations	144,986,212	147,718,751
Total Investments in Securities	144,986,212	147,718,751
Total Investments	$ 144,986,212	$ 147,718,751