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FEES PAID BY THE FUND AND RELATED PARTY TRANSACTIONS (Additional Information) (Detail) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2018
Fees Paid And Related Party Transactions [Line Items]
USCF Management Fee			USO is contractually obligated to pay USCF a fee, which is paid monthly, equal to 0.45% per annum of average daily total net assets.
Ongoing Registration Fees and Other Offering Expenses	$ 5,963	$ 87,822	$ 93,326	$ 260,603
Fees and expenses	80,559	90,856	236,202	271,193
Licensing fee incurred	$ 66,164	$ 98,128	209,789	313,398
Scenario, Forecast [Member]
Fees Paid And Related Party Transactions [Line Items]
Estimated investor tax reporting cost					$ 1,850,000
USO And Related Public Funds [Member] | Scenario, Forecast [Member]
Fees Paid And Related Party Transactions [Line Items]
Fees and expenses					536,200
USO [Member]
Fees Paid And Related Party Transactions [Line Items]
Ongoing Registration Fees and Other Offering Expenses			93,326	260,603
Licensing fee incurred			$ 209,789	$ 313,398
USO [Member] | Scenario, Forecast [Member]
Fees Paid And Related Party Transactions [Line Items]
Fees and expenses					$ 324,000
Licensing Agreements [Member]
Fees Paid And Related Party Transactions [Line Items]
Fee percentage			0.015%

X

- Definition

Description of the nature of payments to managing member or general partner for management of the day-to-day business functions of the limited liability company (LLC) or limited partnership (LP), including the fee rate, basis of calculation, relevant accounting period, whether the fee is paid to an entity other than the managing member or general partner, or whether the fee is waived.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864

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- Definition

Noninterest expense related to directors' fees which are fees paid by an Entity to its directors. Directors' fees may be paid in addition to salary and other benefits.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 220
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04.14)
-URI http://asc.fasb.org/extlink&oid=114873765&loc=SL114874048-224260

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- Definition

Amount of general expenses not normally included in Other Operating Costs and Expenses.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.6)
-URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227

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- Definition

Base Fee Percentage

+ References

No definition available.

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Fees Paid and Related Party Transactions [Line Items]

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- Definition

It represent the value of license fees and other offering expenses.

+ References

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Registration Fees and Other Offering Expenses

+ References

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