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CONTRACTS AND AGREEMENTS (Brokerage Commissions) (Details) (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Floor Brokerage Exchange and Clearance Fees	$ 1,595us-gaap_FloorBrokerageExchangeAndClearanceFees	$ 2,070us-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	969us-gaap_FloorBrokerageExchangeAndClearanceFees / us-gaap_StatementClassOfStockAxis = unl_RebalancingInvestmentsTransactionMember	1,072us-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	$ 626us-gaap_FloorBrokerageExchangeAndClearanceFees / us-gaap_StatementClassOfStockAxis = unl_CreationAndRedemptionActivityMember	$ 998us-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

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No definition available.

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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

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- Details

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X

- Details

Name:	us-gaap_StatementClassOfStockAxis=unl_RebalancingInvestmentsTransactionMember
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