TRUST SERIES (Additional Information) (Details)				1 Months Ended				3 Months Ended
	Sep. 14, 2011 shares	Sep. 06, 2011	Aug. 10, 2010 USD ($) $ / shares $ / Basket shares	Nov. 15, 2011 USD ($) $ / shares $ / Basket shares	Sep. 19, 2011 shares	Jul. 30, 2010	Dec. 21, 2009 USD ($) shares	Mar. 31, 2019 USD ($) $ / shares	Dec. 31, 2018 USD ($) $ / shares	Mar. 31, 2018 $ / shares $ / Basket	Dec. 31, 2017 $ / shares	Apr. 13, 2012 $ / shares $ / Basket	Nov. 10, 2010 USD ($) $ / Basket
Capital Unit [Line Items]
Sponsor capital contribution							$ 1,000
Capital contribution to trust series							$ 1,000
Units acquisition | shares							20
Fee paid by Authorized Purchasers for each order placed to create one or more Creation Baskets or to redeem one or more baskets | $ / Basket			1,000
Partner sponsor units description								On November 10, 2010, the Trust transferred $1,000 to each of USAG and CPER, which was deemed a capital contribution to each series. On November 14, 2011, USCF received 40 Sponsor Shares of CPER in exchange for the previously received capital contribution, representing a beneficial interest in CPER. On December 7, 2011, USCF redeemed the 40 Sponsor Shares of CPER and purchased 40 shares of CPER in the open market. On April 13, 2012, USCF received 40 Sponsor Shares of USAG in exchange for the previously received capital contribution, representing a beneficial interest in USAG. On June 28, 2012, USCF redeemed the 40 Sponsor Shares of USAG and on October 3, 2012, purchased 5 shares of USAG on the open market.
Future Contract Rebalance Target Weightage								7.14%
United States Commodity Index Fund [Member]
Capital Unit [Line Items]
Sponsor capital contribution								$ 0	$ 0				$ 3,000
Units acquisition | shares	20				5
Number of initially registered units on Form S-1 with the U.S. Securities and Exchange Commission						50,000,000
Initial offering price per unit NAV | $ / shares			$ 50.00					$ 38.81	$ 37.49	$ 42.72	$ 42.48
Number of units issued | shares			100,000
Value of unit issued			$ 5,000,000
Number of registered units			100,000
United States Commodity Index Fund [Member] | Futures Contracts [Member]
Capital Unit [Line Items]
Future contract held								11,631
United States Commodity Index Fund [Member] | Futures Contracts [Member] | NYMEX [Member]
Capital Unit [Line Items]
Future contract held								1,894
United States Commodity Index Fund [Member] | Futures Contracts [Member] | Ice Futures [Member]
Capital Unit [Line Items]
Future contract held								2,701
United States Commodity Index Fund [Member] | Futures Contracts [Member] | Chicago Board of Trade [Member]
Capital Unit [Line Items]
Future contract held								2,914
United States Commodity Index Fund [Member] | Futures Contracts [Member] | Chicago Mercantile Exchange [Member]
Capital Unit [Line Items]
Future contract held								1,858
United States Commodity Index Fund [Member] | Futures Contracts [Member] | London Metal Exchange [Member]
Capital Unit [Line Items]
Future contract held								2,025
United States Commodity Index Fund [Member] | Futures Contracts [Member] | Commodity Exchange Inc [Member]
Capital Unit [Line Items]
Future contract held								239
United States Agriculture Index Fund [Member]
Capital Unit [Line Items]
Number of initially registered units on Form S-1 with the U.S. Securities and Exchange Commission		20,000,000
Initial offering price per unit NAV | $ / shares												$ 25
Fee paid by Authorized Purchasers for each order placed to create one or more Creation Baskets or to redeem one or more baskets | $ / Basket												1,000
United States Copper Index Fund [Member]
Capital Unit [Line Items]
Sponsor capital contribution								$ 0	$ 0
Number of initially registered units on Form S-1 with the U.S. Securities and Exchange Commission		30,000,000
Initial offering price per unit NAV | $ / shares				$ 25				$ 18.36	$ 16.44	$ 19.30	$ 21.05
Number of units issued | shares				100,000
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 | $ / Basket				1,000						1,000			1,000
United States Copper Index Fund [Member] | Futures Contracts [Member] | Commodity Exchange Inc [Member]
Capital Unit [Line Items]
Future contract held								224