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FAIR VALUE OF FINANCIAL INSTRUMENTS (Effect of Derivative Instruments on Condensed Statements of Operations) (Details) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Realized Gain or (Loss) on Derivatives Recognized in Income | $ 2,205,950 us-gaap_GainLossOnSaleOfInvestments | $ 2,395,300 us-gaap_GainLossOnSaleOfInvestments | $ (12,161,650)us-gaap_GainLossOnSaleOfInvestments
Change in Unrealized Gain (Loss) on Derivatives Recognized in Income | (6,009,940)us-gaap_UnrealizedGainLossOnDerivativesAndCommodityContracts | 1,996,630 us-gaap_UnrealizedGainLossOnDerivativesAndCommodityContracts | 7,676,740 us-gaap_UnrealizedGainLossOnDerivativesAndCommodityContracts
Commodity Contracts [Member] | Futures [Member] | Realized gain on closed positions |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Realized Gain or (Loss) on Derivatives Recognized in Income | 2,205,950 us-gaap_GainLossOnSaleOfInvestments / us-gaap_BalanceSheetLocationAxis = unl_ClosedPositionsMember / us-gaap_DerivativeByNatureAxis = us-gaap_FutureMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember | 2,395,300 us-gaap_GainLossOnSaleOfInvestments / us-gaap_BalanceSheetLocationAxis = unl_ClosedPositionsMember / us-gaap_DerivativeByNatureAxis = us-gaap_FutureMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember | (12,161,650)us-gaap_GainLossOnSaleOfInvestments / us-gaap_BalanceSheetLocationAxis = unl_ClosedPositionsMember / us-gaap_DerivativeByNatureAxis = us-gaap_FutureMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember
Commodity Contracts [Member] | Futures [Member] | Change in unrealized gain on open positions |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Change in Unrealized Gain (Loss) on Derivatives Recognized in Income | $ (6,009,940)us-gaap_UnrealizedGainLossOnDerivativesAndCommodityContracts / us-gaap_BalanceSheetLocationAxis = unl_OpenPositionMember / us-gaap_DerivativeByNatureAxis = us-gaap_FutureMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember | $ 1,996,630 us-gaap_UnrealizedGainLossOnDerivativesAndCommodityContracts / us-gaap_BalanceSheetLocationAxis = unl_OpenPositionMember / us-gaap_DerivativeByNatureAxis = us-gaap_FutureMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember | $ 7,676,740 us-gaap_UnrealizedGainLossOnDerivativesAndCommodityContracts / us-gaap_BalanceSheetLocationAxis = unl_OpenPositionMember / us-gaap_DerivativeByNatureAxis = us-gaap_FutureMember / us-gaap_DerivativeInstrumentRiskAxis = us-gaap_CommodityContractMember

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- Definition The net realized gain (loss) on investments sold during the period, not including gains (losses) on securities separately or otherwise categorized as trading, available-for-sale, or held-to-maturity, which, for cash flow reporting, is a component of proceeds from investing activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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- Definition The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of open derivatives, commodity, or energy contracts, held at each balance sheet date, that was included in earnings for the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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