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Fees Paid by The Fund and Related Party Transactions (Additional Information) (Detail) (USD $)	3 Months Ended		12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 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	$ 5,339uso_RegistrationFeesAndOtherOfferingExpenses	$ 500uso_RegistrationFeesAndOtherOfferingExpenses
Fees and expenses	68,084us-gaap_NoninterestExpenseDirectorsFees	44,892us-gaap_NoninterestExpenseDirectorsFees
Licensing fee incurred	85,264us-gaap_LicenseCosts	25,025us-gaap_LicenseCosts
Estimated investor tax reporting cost			1,200,000us-gaap_OtherGeneralExpense
USO And Related Public Funds [Member]
Fees Paid And Related Party Transactions [Line Items]
Fees and expenses			560,625us-gaap_NoninterestExpenseDirectorsFees / invest_InvestmentIdentifierSchemeAxis = uso_UsoAndRelatedPublicFundsMember
USO [Member]
Fees Paid And Related Party Transactions [Line Items]
Fees and expenses			$ 171,916us-gaap_NoninterestExpenseDirectorsFees / invest_InvestmentIdentifierSchemeAxis = uso_UsoMember
Licensing Agreements [Member] | On and after October 20, 2011 [Member]
Fees Paid And Related Party Transactions [Line Items]
Fee percentage	0.015%uso_BaseFeePercentage / invest_InvestmentIdentifierSchemeAxis = uso_GroupNineMember / us-gaap_TypeOfArrangementAxis = us-gaap_LicensingAgreementsMember

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

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
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_
Data Type:	xbrli:stringItemType
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

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
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



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 6

-Article 5

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- 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

- Details

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Registration Fees and Other Offering Expenses

+ References

No definition available.

+ Details

Name:	uso_RegistrationFeesAndOtherOfferingExpenses
Namespace Prefix:	uso_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- Details

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- Details

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X

- Details

Name:	us-gaap_TypeOfArrangementAxis=us-gaap_LicensingAgreementsMember
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Period Type: