Additional Valuation Information - Summary of the Tiered Valuation Input Levels (Detail) - USD ($)	Mar. 31, 2021	Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
United States Treasury Obligations	$ 863,930,234	$ 399,870,102
Exchange-Traded Fund	180,974,994	180,949,308
Money Market Mutual Fund	797,334,599	710,155,447
Total Investments in Securities	1,842,239,827	1,290,974,857
Commodity Futures Contracts, Appreciation	269,024,645	148,843,441
Commodity Futures Contracts, Depreciation	(10,212,865)
Commodity Futures Contracts	258,811,780
Total Investments	2,101,051,607	1,439,818,298
Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Exchange-Traded Fund	180,974,994	180,949,308
Money Market Mutual Fund	797,334,599	710,155,447
Total Investments in Securities	978,309,593	891,104,755
Commodity Futures Contracts, Appreciation	269,024,645	148,843,441
Commodity Futures Contracts, Depreciation	(10,212,865)
Commodity Futures Contracts	258,811,780
Total Investments	1,237,121,373	1,039,948,196
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
United States Treasury Obligations	863,930,234	399,870,102
Total Investments in Securities	863,930,234	399,870,102
Total Investments	$ 863,930,234	$ 399,870,102