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	$ 13,998,559	$ 14,963,000
Exchange-Traded Fund	10,109,288	20,031,492
Money Market Mutual Fund	12,174,384	30,030,218
Total Investments in Securities	36,282,231	65,024,710
Commodity Futures Contracts, Appreciation		2,540,955
Commodity Futures Contracts, Depreciation	(20,064,120)	(925,671)
Commodity Futures Contracts		1,615,284
Total Investments	16,218,111	66,639,994
Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Exchange-Traded Fund	10,109,288	20,031,492
Money Market Mutual Fund	12,174,384	30,030,218
Total Investments in Securities	22,283,672	50,061,710
Commodity Futures Contracts, Appreciation		2,540,955
Commodity Futures Contracts, Depreciation	(20,064,120)	(925,671)
Commodity Futures Contracts		1,615,284
Total Investments	2,219,552	51,676,994
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
United States Treasury Obligations	13,998,559	14,963,000
Total Investments in Securities	13,998,559	14,963,000
Total Investments	$ 13,998,559	$ 14,963,000