XML 40 R24.htm IDEA: XBRL DOCUMENT v3.4.0.3

CONTRACTS AND AGREEMENTS (Brokerage Commission) (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Brokerage commissions	$ 2,229,168	$ 1,187,217
Rebalancing Investments Transaction [Member]
Brokerage commissions	$ 2,004,368	$ 958,970
Percentage of average daily net assets	89.92%	80.77%
Creation And Redemption Activity [Member]
Brokerage commissions	$ 224,800	$ 228,247
Percentage of average daily net assets	10.08%	19.23%
Commission [Member]
Percentage of average daily net assets	0.26%	0.21%

X

- Definition

The amount of expense during the period for floor brokerage fees paid to other broker-dealers to execute trades on their behalf, stock exchange fees, order flow fees, and clearance fees.

+ References

No definition available.

+ Details

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

X

- Definition

Percentage of Average Daily Net Assets

+ References

No definition available.

+ Details

Name:	uso_PercentageOfAverageDailyNetAssets
Namespace Prefix:	uso_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	us-gaap_NatureOfExpenseAxis=uso_RebalancingInvestmentsTransactionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_NatureOfExpenseAxis=uso_TradesNecessitatedByCreationAndRedemptionActivityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_NatureOfExpenseAxis=uso_CommissionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: