XML 40 R24.htm IDEA: XBRL DOCUMENT v3.5.0.2

CONTRACTS AND AGREEMENTS (Brokerage Commission) (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Brokerage commissions	$ 1,544,097	$ 1,327,477	$ 5,376,805	$ 3,609,509
Commission [Member]
Brokerage commissions			$ 5,376,805	$ 3,609,509
Percentage of average daily net assets	0.21%	0.20%	0.21%	0.20%
Rebalancing Investments Transaction [Member]
Brokerage commissions			$ 4,920,092	$ 2,972,195
Percentage of average daily net assets	91.51%	82.34%	91.51%	82.34%
Creation And Redemption Activity [Member]
Brokerage commissions			$ 456,713	$ 637,314
Percentage of average daily net assets	8.49%	17.66%	8.49%	17.66%

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_CommissionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

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: