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	$ 474,944,195	$ 664,863,392
Exchange-Traded Fund	251,925,156	250,383,096
Money Market Mutual Fund	33,033,294	517,499,491
Total Investments in Securities	759,902,645	1,432,745,979
Commodity Futures Contracts, Appreciation	2,305,988	67,605,844
Commodity Futures Contracts, Depreciation	(273,197,361)	(19,911,449)
Commodity Futures Contracts	(270,891,373)	47,694,395
Total Investments	489,011,272	1,480,440,374
Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Exchange-Traded Fund	251,925,156	250,383,096
Money Market Mutual Fund	33,033,294	517,499,491
Total Investments in Securities	284,958,450	767,882,587
Commodity Futures Contracts, Appreciation	2,305,988	67,605,844
Commodity Futures Contracts, Depreciation	(273,197,361)	(19,911,449)
Commodity Futures Contracts	(270,891,373)	47,694,395
Total Investments	14,067,077	815,576,982
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
United States Treasury Obligations	474,944,195	664,863,392
Total Investments in Securities	474,944,195	664,863,392
Total Investments	$ 474,944,195	$ 664,863,392

Financial instruments owned exchange traded fund.

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Financial instruments owned money market mutual fund at fair value.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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- Definition

The aggregate fair value as of the balance sheet date of financial instruments and other positions owned by the entity including: (1) mortgages, mortgage-backed and asset backed securities; (2) US government and agency obligations; (3) state and municipal government obligations; (4) other sovereign government debt; (5) corporate obligations; (6) corporate equities; (7) principal investments; (8) derivative contracts; and (9) physical commodities. Includes both pledged and unpledged holdings.

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-Topic 940
-SubTopic 320
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The fair value as of the balance sheet date of firm holdings in debt obligations issued by the US government including short-term Treasury bills, medium-term Treasury notes, and long-term Treasury bonds, as well as debt issued by agencies. Includes both pledged (to counterparties as collateral for financing transactions) and unpledged holdings.

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Value of the investment at close of period. For schedules of investments that are categorized, the value would be aggregated by category. For investment in and advances to affiliates, if operations of any controlled companies are different in character from those of the company, group such affiliates within divisions and by type of activities.

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This element represents the net excess or deficiency of the fair value of an investment (security, contract) over or under its cost (face amount, notional amount), respectively, which excess value or deficiency has not been recognized in earnings of the entity.

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