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CONTRACTS AND AGREEMENTS (Brokerage Commissions) (Details) (USD $) | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Floor Brokerage Exchange and Clearance Fees | $ 1,595 us-gaap_FloorBrokerageExchangeAndClearanceFees | $ 2,070 us-gaap_FloorBrokerageExchangeAndClearanceFees
Percentage Of Average Daily Net Assets | 0.04%unl_PercentageOfAverageDailyNetAssets | 0.03%unl_PercentageOfAverageDailyNetAssets
Rebalancing Investments Transaction [Member] |  |
Floor Brokerage Exchange and Clearance Fees | 969 us-gaap_FloorBrokerageExchangeAndClearanceFees / us-gaap_StatementClassOfStockAxis = unl_RebalancingInvestmentsTransactionMember | 1,072 us-gaap_FloorBrokerageExchangeAndClearanceFees / us-gaap_StatementClassOfStockAxis = unl_RebalancingInvestmentsTransactionMember
Percentage Of Average Daily Net Assets | 60.78%unl_PercentageOfAverageDailyNetAssets / us-gaap_StatementClassOfStockAxis = unl_RebalancingInvestmentsTransactionMember | 51.79%unl_PercentageOfAverageDailyNetAssets / us-gaap_StatementClassOfStockAxis = unl_RebalancingInvestmentsTransactionMember
Creation And Redemption Activity [Member] |  |
Floor Brokerage Exchange and Clearance Fees | $ 626 us-gaap_FloorBrokerageExchangeAndClearanceFees / us-gaap_StatementClassOfStockAxis = unl_CreationAndRedemptionActivityMember | $ 998 us-gaap_FloorBrokerageExchangeAndClearanceFees / us-gaap_StatementClassOfStockAxis = unl_CreationAndRedemptionActivityMember
Percentage Of Average Daily Net Assets | 39.22%unl_PercentageOfAverageDailyNetAssets / us-gaap_StatementClassOfStockAxis = unl_CreationAndRedemptionActivityMember | 48.21%unl_PercentageOfAverageDailyNetAssets / us-gaap_StatementClassOfStockAxis = unl_CreationAndRedemptionActivityMember

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- Definition Percentage of Average Daily Net Assets + References No definition available. + Details
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Namespace Prefix: | unl_
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- 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

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_StatementClassOfStockAxis=unl_RebalancingInvestmentsTransactionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |