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CONTRACTS AND AGREEMENTS (Brokerage Commissions) (Details) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Floor Brokerage Exchange and Clearance Fees | $ 3,918 us-gaap_FloorBrokerageExchangeAndClearanceFees | $ 8,360 us-gaap_FloorBrokerageExchangeAndClearanceFees | $ 14,360 us-gaap_FloorBrokerageExchangeAndClearanceFees
Annualized percentage of average total net assets | 0.02%unl_AverageDailyTotalNetAssetPercentage | 0.03%unl_AverageDailyTotalNetAssetPercentage | 0.04%unl_AverageDailyTotalNetAssetPercentage
Rebalancing Investments Transaction [Member] |  |  |
Floor Brokerage Exchange and Clearance Fees | 2,126 us-gaap_FloorBrokerageExchangeAndClearanceFees / us-gaap_StatementClassOfStockAxis = unl_RebalancingInvestmentsTransactionMember | 4,484 us-gaap_FloorBrokerageExchangeAndClearanceFees / us-gaap_StatementClassOfStockAxis = unl_RebalancingInvestmentsTransactionMember | 10,995 us-gaap_FloorBrokerageExchangeAndClearanceFees / us-gaap_StatementClassOfStockAxis = unl_RebalancingInvestmentsTransactionMember
Percentage Of Average Daily Net Assets | 54.26%unl_PercentageOfAverageDailyNetAssets / us-gaap_StatementClassOfStockAxis = unl_RebalancingInvestmentsTransactionMember | 53.64%unl_PercentageOfAverageDailyNetAssets / us-gaap_StatementClassOfStockAxis = unl_RebalancingInvestmentsTransactionMember | 76.57%unl_PercentageOfAverageDailyNetAssets / us-gaap_StatementClassOfStockAxis = unl_RebalancingInvestmentsTransactionMember
Creation And Redemption Activity [Member] |  |  |
Floor Brokerage Exchange and Clearance Fees | $ 1,792 us-gaap_FloorBrokerageExchangeAndClearanceFees / us-gaap_StatementClassOfStockAxis = unl_CreationAndRedemptionActivityMember | $ 3,876 us-gaap_FloorBrokerageExchangeAndClearanceFees / us-gaap_StatementClassOfStockAxis = unl_CreationAndRedemptionActivityMember | $ 3,365 us-gaap_FloorBrokerageExchangeAndClearanceFees / us-gaap_StatementClassOfStockAxis = unl_CreationAndRedemptionActivityMember
Percentage Of Average Daily Net Assets | 45.74%unl_PercentageOfAverageDailyNetAssets / us-gaap_StatementClassOfStockAxis = unl_CreationAndRedemptionActivityMember | 46.36%unl_PercentageOfAverageDailyNetAssets / us-gaap_StatementClassOfStockAxis = unl_CreationAndRedemptionActivityMember | 23.43%unl_PercentageOfAverageDailyNetAssets / us-gaap_StatementClassOfStockAxis = unl_CreationAndRedemptionActivityMember

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- Definition Percentage of average daily total net assets during the period. + References No definition available. + Details
Name: | unl_AverageDailyTotalNetAssetPercentage
Namespace Prefix: | unl_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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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

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

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