XML 34 R18.htm IDEA: XBRL DOCUMENT
v3.4.0.3

Contracts and Agreements (Tables) | 3 Months Ended
--- | ---
Mar. 31, 2016
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 three months ended March 31, 2016 |  |  | For the three months ended March 31, 2015 |
Total commissions accrued to brokers |  | $ | 8,669 |  |  | $ | 6,437 |
Total commissions as an annualized percentage of average net assets |  |  | 0.04 | % |  |  | 0.04 | %
Commissions accrued as a result of rebalancing |  | $ | 1,280 |  |  | $ | 4,323 |
Percentage of commissions accrued as a result of rebalancing |  |  | 14.77 | % |  |  | 67.16 | %
Commissions accrued as a result of creation and redemption activity |  | $ | 7,389 |  |  | $ | 2,114 |
Percentage of commissions accrued as a result of creation and redemption activity |  |  | 85.23 | % |  |  | 32.84 | %

X
- References No definition available. + Details
Name: | us-gaap_ContractorsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of fees earned by the broker commission. + References No definition available. + Details
Name: | usl_BrokerageCommissionsTableTextBlock
Namespace Prefix: | usl_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration