XML 36 R18.htm IDEA: XBRL DOCUMENT
v2.4.0.8

Contracts and Agreements (Tables) | 6 Months Ended
--- | ---
Jun. 30, 2014
Contractors [Abstract] |
Brokerage Commissions | USL also incurs commissions to brokers for the purchase and sale of Oil Futures Contracts, Other Oil-Related Investments or short-term obligations of the United States of two years or less (“Treasuries”).
|  | For the six months ended June 30, 2014 |  |  | For the six months ended June 30, 2013 |
Total commissions accrued to brokers |  | $ | 2,516 |  |  | $ | 6,271 |
Commissions accrued as a result of rebalancing |  | $ | 1,984 |  |  | $ | 2,449 |
Percentage of commissions accrued as a result of rebalancing |  |  | 78.86 | % |  |  | 39.05 | %
Commissions accrued as a result of creation and redemption activity |  | $ | 532 |  |  | $ | 3,822 |
Percentage of commissions accrued as a result of creation and redemption activity |  |  | 21.14 | % |  |  | 60.95 | %

X
- Details
Name: | us-gaap_ContractorsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition No authoritative reference available. + References No definition available. + Details
Name: | usl_BrokerageCommissionsTextBlock
Namespace Prefix: | usl_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration