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Fees Paid by The Fund and Related Party Transactions (Additional Information) (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
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	$ 80,969	$ 850	$ 86,308	$ 1,350
Fees and expenses	74,156	42,660	142,240	87,552
Licensing fee incurred	$ 96,781	$ 20,873	182,045	45,898
Scenario, Forecast [Member]
Fees Paid And Related Party Transactions [Line Items]
Estimated investor tax reporting cost			1,200,000
USO And Related Public Funds [Member] | Scenario, Forecast [Member]
Fees Paid And Related Party Transactions [Line Items]
Fees and expenses			569,300
USO [Member]
Fees Paid And Related Party Transactions [Line Items]
Ongoing Registration Fees and Other Offering Expenses			86,308	1,350
Licensing fee incurred			182,045	$ 45,898
USO [Member] | Scenario, Forecast [Member]
Fees Paid And Related Party Transactions [Line Items]
Fees and expenses			$ 293,400
Licensing Agreements [Member]
Fees Paid And Related Party Transactions [Line Items]
Fee percentage			0.015%

X

- Definition

Costs incurred and are directly related to generating license revenue. Licensing arrangements include, but are not limited to, rights to use a patent, copyright, technology, manufacturing process, software or trademark.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 225



-SubTopic 10



-Section S99



-Paragraph 2



-Subparagraph (SX 210.5-03.2(e))



-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

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Balance Type:	debit
Period Type:	duration

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://www.xbrl.org/2003/role/presentationRef



-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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Namespace Prefix:	us-gaap_
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Balance Type:	na
Period Type:	duration

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://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 942



-SubTopic 225



-Section S99



-Paragraph 1



-Subparagraph (SX 210.9-04.14)



-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

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Balance Type:	debit
Period Type:	duration

X

- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 225



-SubTopic 10



-Section S99



-Paragraph 2



-Subparagraph (SX 210.5-03.6)



-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

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- Definition

Base Fee Percentage

+ References

No definition available.

+ Details

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Namespace Prefix:	uso_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Fees Paid and Related Party Transactions [Line Items]

+ References

No definition available.

+ Details

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Namespace Prefix:	uso_
Data Type:	xbrli:stringItemType
Balance Type:	na
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- Definition

Registration Fees and Other Offering Expenses

+ References

No definition available.

+ Details

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