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CONTRACTS AND AGREEMENTS (Brokerage Commissions) (Details) (USD $) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013
Floor Brokerage Exchange and Clearance Fees | $ (189) | $ 2,124 | $ 1,881 | $ 5,412
Percentage Of Average Daily Net Assets | 0.75% |  | 0.75% |
Rebalancing Investments Transaction [Member] |  |  |  |
Floor Brokerage Exchange and Clearance Fees |  |  | 509 | 2,264
Percentage Of Average Daily Net Assets | 27.06% | 41.83% | 27.06% | 41.83%
Creation And Redemption Activity [Member] |  |  |  |
Floor Brokerage Exchange and Clearance Fees |  |  | $ 1,372 | $ 3,148
Percentage Of Average Daily Net Assets | 72.94% | 58.17% | 72.94% | 58.17%

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- Definition Percentage of Average Daily Net Assets + References No definition available. + Details
Name: | unl_PercentageOfAverageDailyNetAssets
Namespace Prefix: | unl_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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