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: |