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Condensed Schedule of Investments (USD $)

Mar. 31, 2015

United State [Member] | Money Market Funds [Member]

Market Values

$ 9,510,692us-gaap_InvestmentOwnedUnderlyingFaceAmountAtMarketValue
/ invest_InvestmentGeographicRegionAxis
= country_US
/ invest_InvestmentSecuritiesClassAxis
= us-gaap_MoneyMarketFundsMember

% of Partners' Capital

55.93%unl_PercentageOfPartnersCapital
/ invest_InvestmentGeographicRegionAxis
= country_US
/ invest_InvestmentSecuritiesClassAxis
= us-gaap_MoneyMarketFundsMember

United State [Member] | Goldman Sachs Financial Square Funds - Government Fund - Class FS [Member] | Money Market Funds [Member]

Unrealized Gain (Loss) on Open Commodity Contracts

1unl_UnrealizedGainLossOnOpenCommodityFuturesAndClearedSwapContracts
/ invest_InvestmentGeographicRegionAxis
= country_US
/ invest_InvestmentSecuritiesClassAxis
= us-gaap_MoneyMarketFundsMember
/ invest_InvestmentSecuritiesSeriesAxis
= unl_GoldmanSachsFinancialSquareFundsGovernmentFundClassFsMember

^[1]

Principal Amount

1us-gaap_InvestmentOwnedBalancePrincipalAmount
/ invest_InvestmentGeographicRegionAxis
= country_US
/ invest_InvestmentSecuritiesClassAxis
= us-gaap_MoneyMarketFundsMember
/ invest_InvestmentSecuritiesSeriesAxis
= unl_GoldmanSachsFinancialSquareFundsGovernmentFundClassFsMember

^[1]

% of Partners' Capital

0.00%unl_PercentageOfPartnersCapital
/ invest_InvestmentGeographicRegionAxis
= country_US
/ invest_InvestmentSecuritiesClassAxis
= us-gaap_MoneyMarketFundsMember
/ invest_InvestmentSecuritiesSeriesAxis
= unl_GoldmanSachsFinancialSquareFundsGovernmentFundClassFsMember

^[1]

Cash Equivalents [Member] | U.S. Treasury Bill, 0.06%, 4/30/2015 [Member] | US Treasury Securities [Member]

Principal Amount

3,000,000us-gaap_InvestmentOwnedBalancePrincipalAmount
/ invest_InvestmentAxis
= us-gaap_CashEquivalentsMember
/ invest_InvestmentSecuritiesClassAxis
= us-gaap_USTreasurySecuritiesMember
/ invest_InvestmentSecuritiesSeriesAxis
= us-gaap_USTreasuryBillSecuritiesMember

Market Values

2,999,867us-gaap_InvestmentOwnedUnderlyingFaceAmountAtMarketValue
/ invest_InvestmentAxis
= us-gaap_CashEquivalentsMember
/ invest_InvestmentSecuritiesClassAxis
= us-gaap_USTreasurySecuritiesMember
/ invest_InvestmentSecuritiesSeriesAxis
= us-gaap_USTreasuryBillSecuritiesMember

% of Partners' Capital

17.64%unl_PercentageOfPartnersCapital
/ invest_InvestmentAxis
= us-gaap_CashEquivalentsMember
/ invest_InvestmentSecuritiesClassAxis
= us-gaap_USTreasurySecuritiesMember
/ invest_InvestmentSecuritiesSeriesAxis
= us-gaap_USTreasuryBillSecuritiesMember

Cash Equivalents [Member] | Morgan Stanley Institutional Liquidity Fund - Government Portfolio [Member] | Money Market Funds [Member]

Principal Amount

6,510,691us-gaap_InvestmentOwnedBalancePrincipalAmount
/ invest_InvestmentAxis
= us-gaap_CashEquivalentsMember
/ invest_InvestmentSecuritiesClassAxis
= us-gaap_MoneyMarketFundsMember
/ invest_InvestmentSecuritiesSeriesAxis
= unl_MorganStanleyInstitutionalLiquidityFundGovernmentPortfolioMember

Market Values

6,510,691us-gaap_InvestmentOwnedUnderlyingFaceAmountAtMarketValue
/ invest_InvestmentAxis
= us-gaap_CashEquivalentsMember
/ invest_InvestmentSecuritiesClassAxis
= us-gaap_MoneyMarketFundsMember
/ invest_InvestmentSecuritiesSeriesAxis
= unl_MorganStanleyInstitutionalLiquidityFundGovernmentPortfolioMember

% of Partners' Capital

38.29%unl_PercentageOfPartnersCapital
/ invest_InvestmentAxis
= us-gaap_CashEquivalentsMember
/ invest_InvestmentSecuritiesClassAxis
= us-gaap_MoneyMarketFundsMember
/ invest_InvestmentSecuritiesSeriesAxis
= unl_MorganStanleyInstitutionalLiquidityFundGovernmentPortfolioMember

Cash Equivalents [Member] | Wells Fargo Advantage Government Money Market Fund - Class I [Member] | Money Market Funds [Member]

Principal Amount

3,000,000us-gaap_InvestmentOwnedBalancePrincipalAmount
/ invest_InvestmentAxis
= us-gaap_CashEquivalentsMember
/ invest_InvestmentSecuritiesClassAxis
= us-gaap_MoneyMarketFundsMember
/ invest_InvestmentSecuritiesSeriesAxis
= unl_WellsFargoAdvantageGovernmentMoneyMarketFundClassIMember

Market Values

3,000,000us-gaap_InvestmentOwnedUnderlyingFaceAmountAtMarketValue
/ invest_InvestmentAxis
= us-gaap_CashEquivalentsMember
/ invest_InvestmentSecuritiesClassAxis
= us-gaap_MoneyMarketFundsMember
/ invest_InvestmentSecuritiesSeriesAxis
= unl_WellsFargoAdvantageGovernmentMoneyMarketFundClassIMember

% of Partners' Capital

17.64%unl_PercentageOfPartnersCapital
/ invest_InvestmentAxis
= us-gaap_CashEquivalentsMember
/ invest_InvestmentSecuritiesClassAxis
= us-gaap_MoneyMarketFundsMember
/ invest_InvestmentSecuritiesSeriesAxis
= unl_WellsFargoAdvantageGovernmentMoneyMarketFundClassIMember

Cash Equivalents [Member] | United State [Member]

Market Values

12,510,559us-gaap_InvestmentOwnedUnderlyingFaceAmountAtMarketValue
/ invest_InvestmentAxis
= us-gaap_CashEquivalentsMember
/ invest_InvestmentGeographicRegionAxis
= country_US

% of Partners' Capital

73.57%unl_PercentageOfPartnersCapital
/ invest_InvestmentAxis
= us-gaap_CashEquivalentsMember
/ invest_InvestmentGeographicRegionAxis
= country_US

Open Futures Contracts, Long [Member] | United State [Member]

Number of Contracts

584us-gaap_InvestmentOwnedBalanceContracts
/ invest_InvestmentGeographicRegionAxis
= country_US
/ us-gaap_InvestmentTypeAxis
= unl_OpenFuturesContractsLongMember

^[2]

Unrealized Gain (Loss) on Open Commodity Contracts

(3,944,865)unl_UnrealizedGainLossOnOpenCommodityFuturesAndClearedSwapContracts
/ invest_InvestmentGeographicRegionAxis
= country_US
/ us-gaap_InvestmentTypeAxis
= unl_OpenFuturesContractsLongMember

^[2]

% of Partners' Capital

(23.20%)unl_PercentageOfPartnersCapital
/ invest_InvestmentGeographicRegionAxis
= country_US
/ us-gaap_InvestmentTypeAxis
= unl_OpenFuturesContractsLongMember

^[2]

Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG May 2015 contracts, expiring April 2015 [Member]

Number of Contracts

48us-gaap_InvestmentOwnedBalanceContracts
/ invest_InvestmentGeographicRegionAxis
= country_US
/ invest_InvestmentSecuritiesSeriesAxis
= unl_NymexNaturalGasFuturesNgOneMember
/ us-gaap_InvestmentTypeAxis
= unl_OpenFuturesContractsLongMember

Unrealized Gain (Loss) on Open Commodity Contracts

(519,710)unl_UnrealizedGainLossOnOpenCommodityFuturesAndClearedSwapContracts
/ invest_InvestmentGeographicRegionAxis
= country_US
/ invest_InvestmentSecuritiesSeriesAxis
= unl_NymexNaturalGasFuturesNgOneMember
/ us-gaap_InvestmentTypeAxis
= unl_OpenFuturesContractsLongMember

% of Partners' Capital

(3.06%)unl_PercentageOfPartnersCapital
/ invest_InvestmentGeographicRegionAxis
= country_US
/ invest_InvestmentSecuritiesSeriesAxis
= unl_NymexNaturalGasFuturesNgOneMember
/ us-gaap_InvestmentTypeAxis
= unl_OpenFuturesContractsLongMember

Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG June 2015 contracts, expiring May 2015 [Member]

Number of Contracts

49us-gaap_InvestmentOwnedBalanceContracts
/ invest_InvestmentGeographicRegionAxis
= country_US
/ invest_InvestmentSecuritiesSeriesAxis
= unl_NymexNaturalGasFuturesNgTwoMember
/ us-gaap_InvestmentTypeAxis
= unl_OpenFuturesContractsLongMember

Unrealized Gain (Loss) on Open Commodity Contracts

(470,840)unl_UnrealizedGainLossOnOpenCommodityFuturesAndClearedSwapContracts
/ invest_InvestmentGeographicRegionAxis
= country_US
/ invest_InvestmentSecuritiesSeriesAxis
= unl_NymexNaturalGasFuturesNgTwoMember
/ us-gaap_InvestmentTypeAxis
= unl_OpenFuturesContractsLongMember

% of Partners' Capital

(2.77%)unl_PercentageOfPartnersCapital
/ invest_InvestmentGeographicRegionAxis
= country_US
/ invest_InvestmentSecuritiesSeriesAxis
= unl_NymexNaturalGasFuturesNgTwoMember
/ us-gaap_InvestmentTypeAxis
= unl_OpenFuturesContractsLongMember

Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG July 2015 contracts, expiring June 2015 [Member]

Number of Contracts

48us-gaap_InvestmentOwnedBalanceContracts
/ invest_InvestmentGeographicRegionAxis
= country_US
/ invest_InvestmentSecuritiesSeriesAxis
= unl_NymexNaturalGasFuturesNgThreeMember
/ us-gaap_InvestmentTypeAxis
= unl_OpenFuturesContractsLongMember

Unrealized Gain (Loss) on Open Commodity Contracts

(493,840)unl_UnrealizedGainLossOnOpenCommodityFuturesAndClearedSwapContracts
/ invest_InvestmentGeographicRegionAxis
= country_US
/ invest_InvestmentSecuritiesSeriesAxis
= unl_NymexNaturalGasFuturesNgThreeMember
/ us-gaap_InvestmentTypeAxis
= unl_OpenFuturesContractsLongMember

% of Partners' Capital

(2.90%)unl_PercentageOfPartnersCapital
/ invest_InvestmentGeographicRegionAxis
= country_US
/ invest_InvestmentSecuritiesSeriesAxis
= unl_NymexNaturalGasFuturesNgThreeMember
/ us-gaap_InvestmentTypeAxis
= unl_OpenFuturesContractsLongMember

Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG August 2015 contracts, expiring July 2015 [Member]

Number of Contracts

49us-gaap_InvestmentOwnedBalanceContracts
/ invest_InvestmentGeographicRegionAxis
= country_US
/ invest_InvestmentSecuritiesSeriesAxis
= unl_NymexNaturalGasFuturesNgFourMember
/ us-gaap_InvestmentTypeAxis
= unl_OpenFuturesContractsLongMember

Unrealized Gain (Loss) on Open Commodity Contracts

(422,970)unl_UnrealizedGainLossOnOpenCommodityFuturesAndClearedSwapContracts
/ invest_InvestmentGeographicRegionAxis
= country_US
/ invest_InvestmentSecuritiesSeriesAxis
= unl_NymexNaturalGasFuturesNgFourMember
/ us-gaap_InvestmentTypeAxis
= unl_OpenFuturesContractsLongMember

% of Partners' Capital

(2.49%)unl_PercentageOfPartnersCapital
/ invest_InvestmentGeographicRegionAxis
= country_US
/ invest_InvestmentSecuritiesSeriesAxis
= unl_NymexNaturalGasFuturesNgFourMember
/ us-gaap_InvestmentTypeAxis
= unl_OpenFuturesContractsLongMember

Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG September 2015 contracts, expiring August 2015 [Member]

Number of Contracts

49us-gaap_InvestmentOwnedBalanceContracts
/ invest_InvestmentGeographicRegionAxis
= country_US
/ invest_InvestmentSecuritiesSeriesAxis
= unl_NymexNaturalGasFuturesNgFiveMember
/ us-gaap_InvestmentTypeAxis
= unl_OpenFuturesContractsLongMember

Unrealized Gain (Loss) on Open Commodity Contracts

(376,940)unl_UnrealizedGainLossOnOpenCommodityFuturesAndClearedSwapContracts
/ invest_InvestmentGeographicRegionAxis
= country_US
/ invest_InvestmentSecuritiesSeriesAxis
= unl_NymexNaturalGasFuturesNgFiveMember
/ us-gaap_InvestmentTypeAxis
= unl_OpenFuturesContractsLongMember

% of Partners' Capital

(2.22%)unl_PercentageOfPartnersCapital
/ invest_InvestmentGeographicRegionAxis
= country_US
/ invest_InvestmentSecuritiesSeriesAxis
= unl_NymexNaturalGasFuturesNgFiveMember
/ us-gaap_InvestmentTypeAxis
= unl_OpenFuturesContractsLongMember

Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG October 2015 contracts, expiring September 2015 [Member]

Number of Contracts

49us-gaap_InvestmentOwnedBalanceContracts
/ invest_InvestmentGeographicRegionAxis
= country_US
/ invest_InvestmentSecuritiesSeriesAxis
= unl_NymexNaturalGasFuturesNgSixMember
/ us-gaap_InvestmentTypeAxis
= unl_OpenFuturesContractsLongMember

Unrealized Gain (Loss) on Open Commodity Contracts

(364,910)unl_UnrealizedGainLossOnOpenCommodityFuturesAndClearedSwapContracts
/ invest_InvestmentGeographicRegionAxis
= country_US
/ invest_InvestmentSecuritiesSeriesAxis
= unl_NymexNaturalGasFuturesNgSixMember
/ us-gaap_InvestmentTypeAxis
= unl_OpenFuturesContractsLongMember

% of Partners' Capital

(2.14%)unl_PercentageOfPartnersCapital
/ invest_InvestmentGeographicRegionAxis
= country_US
/ invest_InvestmentSecuritiesSeriesAxis
= unl_NymexNaturalGasFuturesNgSixMember
/ us-gaap_InvestmentTypeAxis
= unl_OpenFuturesContractsLongMember

Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG November 2015 contracts, expiring October 2015 [Member]

Number of Contracts

49us-gaap_InvestmentOwnedBalanceContracts
/ invest_InvestmentGeographicRegionAxis
= country_US
/ invest_InvestmentSecuritiesSeriesAxis
= unl_NymexNaturalGasFuturesNgSevenMember
/ us-gaap_InvestmentTypeAxis
= unl_OpenFuturesContractsLongMember

Unrealized Gain (Loss) on Open Commodity Contracts

(342,080)unl_UnrealizedGainLossOnOpenCommodityFuturesAndClearedSwapContracts
/ invest_InvestmentGeographicRegionAxis
= country_US
/ invest_InvestmentSecuritiesSeriesAxis
= unl_NymexNaturalGasFuturesNgSevenMember
/ us-gaap_InvestmentTypeAxis
= unl_OpenFuturesContractsLongMember

% of Partners' Capital

(2.01%)unl_PercentageOfPartnersCapital
/ invest_InvestmentGeographicRegionAxis
= country_US
/ invest_InvestmentSecuritiesSeriesAxis
= unl_NymexNaturalGasFuturesNgSevenMember
/ us-gaap_InvestmentTypeAxis
= unl_OpenFuturesContractsLongMember

Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG December 2015 contracts, expiring November 2015 [Member]

Number of Contracts

49us-gaap_InvestmentOwnedBalanceContracts
/ invest_InvestmentGeographicRegionAxis
= country_US
/ invest_InvestmentSecuritiesSeriesAxis
= unl_NymexNaturalGasFuturesNgEightMember
/ us-gaap_InvestmentTypeAxis
= unl_OpenFuturesContractsLongMember

Unrealized Gain (Loss) on Open Commodity Contracts

(355,050)unl_UnrealizedGainLossOnOpenCommodityFuturesAndClearedSwapContracts
/ invest_InvestmentGeographicRegionAxis
= country_US
/ invest_InvestmentSecuritiesSeriesAxis
= unl_NymexNaturalGasFuturesNgEightMember
/ us-gaap_InvestmentTypeAxis
= unl_OpenFuturesContractsLongMember

% of Partners' Capital

(2.09%)unl_PercentageOfPartnersCapital
/ invest_InvestmentGeographicRegionAxis
= country_US
/ invest_InvestmentSecuritiesSeriesAxis
= unl_NymexNaturalGasFuturesNgEightMember
/ us-gaap_InvestmentTypeAxis
= unl_OpenFuturesContractsLongMember

Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG January 2016 contracts, expiring December 2015 [Memer]

Number of Contracts

48us-gaap_InvestmentOwnedBalanceContracts
/ invest_InvestmentGeographicRegionAxis
= country_US
/ invest_InvestmentSecuritiesSeriesAxis
= unl_NymexNaturalGasFuturesNgNineMember
/ us-gaap_InvestmentTypeAxis
= unl_OpenFuturesContractsLongMember

Unrealized Gain (Loss) on Open Commodity Contracts

(309,900)unl_UnrealizedGainLossOnOpenCommodityFuturesAndClearedSwapContracts
/ invest_InvestmentGeographicRegionAxis
= country_US
/ invest_InvestmentSecuritiesSeriesAxis
= unl_NymexNaturalGasFuturesNgNineMember
/ us-gaap_InvestmentTypeAxis
= unl_OpenFuturesContractsLongMember

% of Partners' Capital

(1.82%)unl_PercentageOfPartnersCapital
/ invest_InvestmentGeographicRegionAxis
= country_US
/ invest_InvestmentSecuritiesSeriesAxis
= unl_NymexNaturalGasFuturesNgNineMember
/ us-gaap_InvestmentTypeAxis
= unl_OpenFuturesContractsLongMember

Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG February 2016 contracts, expiring January 2016 [Member]

Number of Contracts

49us-gaap_InvestmentOwnedBalanceContracts
/ invest_InvestmentGeographicRegionAxis
= country_US
/ invest_InvestmentSecuritiesSeriesAxis
= unl_NymexNaturalGasFuturesNgTenMember
/ us-gaap_InvestmentTypeAxis
= unl_OpenFuturesContractsLongMember

Unrealized Gain (Loss) on Open Commodity Contracts

(164,720)unl_UnrealizedGainLossOnOpenCommodityFuturesAndClearedSwapContracts
/ invest_InvestmentGeographicRegionAxis
= country_US
/ invest_InvestmentSecuritiesSeriesAxis
= unl_NymexNaturalGasFuturesNgTenMember
/ us-gaap_InvestmentTypeAxis
= unl_OpenFuturesContractsLongMember

% of Partners' Capital

(0.97%)unl_PercentageOfPartnersCapital
/ invest_InvestmentGeographicRegionAxis
= country_US
/ invest_InvestmentSecuritiesSeriesAxis
= unl_NymexNaturalGasFuturesNgTenMember
/ us-gaap_InvestmentTypeAxis
= unl_OpenFuturesContractsLongMember

Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG March 2016 contracts, expiring February 2016 [Member]

Number of Contracts

48us-gaap_InvestmentOwnedBalanceContracts
/ invest_InvestmentGeographicRegionAxis
= country_US
/ invest_InvestmentSecuritiesSeriesAxis
= unl_NymexNaturalGasFuturesNgElevenMember
/ us-gaap_InvestmentTypeAxis
= unl_OpenFuturesContractsLongMember

Unrealized Gain (Loss) on Open Commodity Contracts

(89,745)unl_UnrealizedGainLossOnOpenCommodityFuturesAndClearedSwapContracts
/ invest_InvestmentGeographicRegionAxis
= country_US
/ invest_InvestmentSecuritiesSeriesAxis
= unl_NymexNaturalGasFuturesNgElevenMember
/ us-gaap_InvestmentTypeAxis
= unl_OpenFuturesContractsLongMember

% of Partners' Capital

(0.53%)unl_PercentageOfPartnersCapital
/ invest_InvestmentGeographicRegionAxis
= country_US
/ invest_InvestmentSecuritiesSeriesAxis
= unl_NymexNaturalGasFuturesNgElevenMember
/ us-gaap_InvestmentTypeAxis
= unl_OpenFuturesContractsLongMember

Open Futures Contracts, Long [Member] | United State [Member] | NYMEX Natural Gas Futures NG April 2016 contracts, expiring March 2016 [Member]

Number of Contracts

49us-gaap_InvestmentOwnedBalanceContracts
/ invest_InvestmentGeographicRegionAxis
= country_US
/ invest_InvestmentSecuritiesSeriesAxis
= unl_NymexNaturalGasFuturesNgTwelveMember
/ us-gaap_InvestmentTypeAxis
= unl_OpenFuturesContractsLongMember

Unrealized Gain (Loss) on Open Commodity Contracts

$ (34,160)unl_UnrealizedGainLossOnOpenCommodityFuturesAndClearedSwapContracts
/ invest_InvestmentGeographicRegionAxis
= country_US
/ invest_InvestmentSecuritiesSeriesAxis
= unl_NymexNaturalGasFuturesNgTwelveMember
/ us-gaap_InvestmentTypeAxis
= unl_OpenFuturesContractsLongMember

% of Partners' Capital

(0.20%)unl_PercentageOfPartnersCapital
/ invest_InvestmentGeographicRegionAxis
= country_US
/ invest_InvestmentSecuritiesSeriesAxis
= unl_NymexNaturalGasFuturesNgTwelveMember
/ us-gaap_InvestmentTypeAxis
= unl_OpenFuturesContractsLongMember

[1]	Represents less than 0.005%.
[2]	Collateral amounted to $5,231,739 on open futures contracts.

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- Definition

Balance held at close of period in number of contracts.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 946

-SubTopic 320

-Section S99

-Paragraph 4

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 946

-SubTopic 320

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-Paragraph 4

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