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	$ 76,994,177	$ 55,798,273
Exchange-Traded Fund	16,130,261	16,031,526
Money Market Mutual Fund	5,276,729	41,862,588
Total Investments in Securities	98,401,167	113,692,387
Commodity Futures Contracts, Depreciation	(12,253,163)
Commodity Futures Contracts, Appreciation		4,835,194
Total Investments	86,148,004	118,527,581
Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Exchange-Traded Fund	16,130,261	16,031,526
Money Market Mutual Fund	5,276,729	41,862,588
Total Investments in Securities	21,406,990	57,894,114
Commodity Futures Contracts, Depreciation	(12,253,163)
Commodity Futures Contracts, Appreciation		4,835,194
Total Investments	9,153,827	62,729,308
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
United States Treasury Obligations	76,994,177	55,798,273
Total Investments in Securities	76,994,177	55,798,273
Total Investments	$ 76,994,177	$ 55,798,273