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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Amount of capital contributions initial.

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- Definition

It represents the shares common units issued for acquisition.

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It represents the shares common units redeemed.

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The amount for fee paid per order.

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Number of Net asset value per unit.

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Number of Contracts

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Number of share purchased during the period.

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Number of initially registered shares.

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Amount of sponsor capital account.

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Number of shares issued during the period.

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Amount received from the issuance of new shares during the period.

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TRUST SERIES (Details)										6 Months Ended
TRUST SERIES (Details)	Dec. 07, 2011 shares	Nov. 15, 2011 USD ($) $ / shares shares	Nov. 14, 2011 shares	Sep. 19, 2011 shares	Sep. 14, 2011 shares	Sep. 06, 2011 shares	Aug. 10, 2010 USD ($) $ / shares shares	Jul. 30, 2010 shares	Dec. 21, 2009 USD ($) shares	Jun. 30, 2026 USD ($) contract $ / shares	Mar. 31, 2026 $ / shares	Dec. 31, 2025 USD ($) $ / shares	Jun. 30, 2025 $ / shares	Mar. 31, 2025 $ / shares	Dec. 31, 2024 $ / shares	Nov. 10, 2010 USD ($)
TRUST SERIES
Fee paid by authorized purchasers for each order placed to create one or more creation baskets or to redeem one or more baskets \| $							$ 1,000
United States Commodity Index Fund
TRUST SERIES
Sponsor capital contribution \| $									$ 1,000	$ 0		$ 0
Capital contribution to trust series \| $									$ 1,000
Units acquisition \| shares				5					20
Number of initially registered units on Form S-1 with the U.S. Securities and Exchange Commission \| shares								50,000,000
Initial offering price per unit NAV \| $ / shares							$ 50			$ 92.44	$ 95.34	$ 77.48	$ 73.26	$ 72	$ 66.04
Number of units issued \| shares							100,000
Value of unit issued \| $							$ 5,000,000
Units redeemed \| shares	40				20
Future contract held										5,868
Investment, Type [Extensible Enumeration]										usci:FuturesContractsMember
United States Commodity Index Fund \| NYMEX
TRUST SERIES
Future contract held										736
Investment, Type [Extensible Enumeration]										usci:FuturesContractsMember
United States Commodity Index Fund \| ICE Futures
TRUST SERIES
Future contract held										833
Investment, Type [Extensible Enumeration]										usci:FuturesContractsMember
United States Commodity Index Fund \| Chicago Board of Trade (CBOT)
TRUST SERIES
Future contract held										1,382
Investment, Type [Extensible Enumeration]										usci:FuturesContractsMember
United States Commodity Index Fund \| Chicago Mercantile Exchange (CME)
TRUST SERIES
Future contract held										373
Investment, Type [Extensible Enumeration]										usci:FuturesContractsMember
United States Commodity Index Fund \| London Metal Exchange (LME)
TRUST SERIES
Future contract held										2,305
Investment, Type [Extensible Enumeration]										usci:FuturesContractsMember
United States Commodity Index Fund \| Commodity Exchange Inc (COMEX)
TRUST SERIES
Future contract held										239
Investment, Type [Extensible Enumeration]										usci:FuturesContractsMember
United States Copper Index Fund
TRUST SERIES
Sponsor capital contribution \| $										$ 0		$ 0
Number of initially registered units on Form S-1 with the U.S. Securities and Exchange Commission \| shares						30,000,000
Initial offering price per unit NAV \| $ / shares		$ 25								$ 37.75	$ 34.31	$ 34.84	$ 31.46	$ 31.5	$ 25.23
Number of units issued \| shares		100,000	40
Value of unit issued \| $		$ 2,500,000
Fee paid by authorized purchasers for each order placed to create one or more creation baskets or to redeem one or more baskets \| $		$ 1,000														$ 1,000
Number of shares purchased \| shares	40
United States Copper Index Fund \| Commodity Exchange Inc (COMEX)
TRUST SERIES
Future contract held										4,576
Investment, Type [Extensible Enumeration]										usci:FuturesContractsMember