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CONTRACTS AND AGREEMENTS (Brokerage Commissions) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Floor Brokerage Exchange and Clearance Fees	$ 3,918us-gaap_FloorBrokerageExchangeAndClearanceFees	$ 8,360us-gaap_FloorBrokerageExchangeAndClearanceFees	$ 14,360us-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	2,126us-gaap_FloorBrokerageExchangeAndClearanceFees / us-gaap_StatementClassOfStockAxis = unl_RebalancingInvestmentsTransactionMember	4,484us-gaap_FloorBrokerageExchangeAndClearanceFees / us-gaap_StatementClassOfStockAxis = unl_RebalancingInvestmentsTransactionMember	10,995us-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	$ 1,792us-gaap_FloorBrokerageExchangeAndClearanceFees / us-gaap_StatementClassOfStockAxis = unl_CreationAndRedemptionActivityMember	$ 3,876us-gaap_FloorBrokerageExchangeAndClearanceFees / us-gaap_StatementClassOfStockAxis = unl_CreationAndRedemptionActivityMember	$ 3,365us-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

X

- Definition

Percentage of average daily total net assets during the period.

+ References

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X

- Definition

Percentage of Average Daily Net Assets

+ References

No definition available.

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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

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X

- Details

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X

- Details

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