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FEES PAID BY THE FUND AND RELATED PARTY TRANSACTIONS (Additional Information) (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
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	$ 349,290	$ 348,425	$ 339,981
Fees and expenses	316,185	357,844	373,311
Licensing fee incurred	271,572	396,719	504,895
Estimated investor tax reporting cost	1,500,000	2,200,000	2,200,000
USO And Related Public Funds [Member]
Fees Paid And Related Party Transactions [Line Items]
Fees and expenses	521,689	536,375	582,050
USO [Member]
Fees Paid And Related Party Transactions [Line Items]
Ongoing Registration Fees and Other Offering Expenses	349,290	348,425
Fees and expenses	316,185	357,844	373,311
Licensing fee incurred	$ 271,572	$ 396,719	$ 504,895
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

+ Details

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X

- 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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X

- Definition

Base Fee Percentage

+ References

No definition available.

+ Details

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- Definition

Fees Paid and Related Party Transactions [Line Items]

+ References

No definition available.

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- Definition

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

+ References

No definition available.

+ Details

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Balance Type:	debit
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- Definition

Registration Fees and Other Offering Expenses

+ References

No definition available.

+ Details

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Namespace Prefix:	uso_
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