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Condensed Schedule of Investments (Parenthetical) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Debt Instrument, Collateral Amount	5,525,172us-gaap_DebtInstrumentCollateralAmount	949,087us-gaap_DebtInstrumentCollateralAmount
Investment Owned, Percent of Net Assets	0.005%us-gaap_InvestmentOwnedPercentOfNetAssets
Cash Equivalents [Member] | U.S. Treasury Bill, 0.06%, 4/30/15 [Member] | Us Treasury Securities [Member]
Expiration date	4/30/15
Interest Rate	0.06%us-gaap_DebtInstrumentInterestRateStatedPercentage / invest_InvestmentAxis = us-gaap_CashEquivalentsMember / invest_InvestmentSecuritiesClassAxis = us-gaap_USTreasurySecuritiesMember / invest_InvestmentSecuritiesSeriesAxis = us-gaap_USTreasuryBillSecuritiesMember
Cash Equivalents [Member] | U.S. Treasury Bill, 0.07%, 3/27/2014 [Member] | Us Treasury Securities [Member]
Interest Rate		0.07%us-gaap_DebtInstrumentInterestRateStatedPercentage / invest_InvestmentAxis = us-gaap_CashEquivalentsMember / invest_InvestmentSecuritiesClassAxis = us-gaap_USTreasurySecuritiesMember / invest_InvestmentSecuritiesSeriesAxis = unl_UsTreasuryBillSecuritiesOneMember
Cash Equivalents [Member] | United States Contracts [Member] | U.S. Treasury Bill, 0.07%, 3/27/2014 [Member]
Expiration date		3/27/2014
Open Futures Contracts, Long [Member] | United States Contracts [Member] | NYMEX Natural Gas Futures NG February 2015 contracts, expiring January 2015 [Member]
Expiration date	January 2015
Open Futures Contracts, Long [Member] | United States Contracts [Member] | NYMEX Natural Gas Futures NG March 2015 contracts, expiring February 2015 [Member]
Expiration date	February 2015
Open Futures Contracts, Long [Member] | United States Contracts [Member] | NYMEX Natural Gas Futures NG April 2015 contracts, expiring March 2015 (Member)
Expiration date	March 2015
Open Futures Contracts, Long [Member] | United States Contracts [Member] | NYMEX Natural Gas Futures NG May 2015 contracts, expiring April 2015 [Member]
Expiration date	April 2015
Open Futures Contracts, Long [Member] | United States Contracts [Member] | NYMEX Natural Gas Futures NG June 2015 contracts, expiring May 2015 [Member]
Expiration date	May 2015
Open Futures Contracts, Long [Member] | United States Contracts [Member] | NYMEX Natural Gas Futures NG July 2015 contracts, expiring June 2015 [Member]
Expiration date	June 2015
Open Futures Contracts, Long [Member] | United States Contracts [Member] | NYMEX Natural Gas Futures NG August 2015 contracts, expiring July 2015 [Member]
Expiration date	July 2015
Open Futures Contracts, Long [Member] | United States Contracts [Member] | NYMEX Natural Gas Futures NG September 2015 contracts, expiring August 2015 [Member]
Expiration date	August 2015
Open Futures Contracts, Long [Member] | United States Contracts [Member] | NYMEX Natural Gas Futures NG October 2015 contracts, expiring September 2015 [Member]
Expiration date	September 2015
Open Futures Contracts, Long [Member] | United States Contracts [Member] | NYMEX Natural Gas Futures NG November 2015 contracts, expiring October 2015 [Member]
Expiration date	October 2015
Open Futures Contracts, Long [Member] | United States Contracts [Member] | NYMEX Natural Gas Futures NG December 2015 contracts, expiring November 2015 [Member]
Expiration date	November 2015
Open Futures Contracts, Long [Member] | United States Contracts [Member] | NYMEX Natural Gas Futures NG January 2016 contracts, expiring December 2015 [Member]
Expiration date	December 2015
Open Futures Contracts, Long [Member] | United States Contracts [Member] | NYMEX Natural Gas Futures NG February 2014 contracts, expiring January 2014 [Member]
Expiration date		January 2014
Open Futures Contracts, Long [Member] | United States Contracts [Member] | NYMEX Natural Gas Futures NG March 2014 contracts, expiring February 2014 [Member]
Expiration date		February 2014
Open Futures Contracts, Long [Member] | United States Contracts [Member] | NYMEX Natural Gas Futures NG April 2014 contracts, expiring March 2014 [Member]
Expiration date		March 2014
Open Futures Contracts, Long [Member] | United States Contracts [Member] | NYMEX Natural Gas Futures NG May 2014 contracts, expiring April 2014 [Member]
Expiration date		April 2014
Open Futures Contracts, Long [Member] | United States Contracts [Member] | NYMEX Natural Gas Futures NG June 2014 contracts, expiring May 2014 [Member]
Expiration date		May 2014
Open Futures Contracts, Long [Member] | United States Contracts [Member] | NYMEX Natural Gas Futures NG July 2014 contracts, expiring June 2014 [Member]
Expiration date		June 2014
Open Futures Contracts, Long [Member] | United States Contracts [Member] | NYMEX Natural Gas Futures NG September 2014 contracts, expiring August 2014 [Member]
Expiration date		August 2014
Open Futures Contracts, Long [Member] | United States Contracts [Member] | NYMEX Natural Gas Futures NG October 2014 contracts, expiring September 2014 [Member]
Expiration date		September 2014
Open Futures Contracts, Long [Member] | United States Contracts [Member] | NYMEX Natural Gas Futures NG November 2014 contracts, expiring October 2014 [Member]
Expiration date		October 2014
Open Futures Contracts, Long [Member] | United States Contracts [Member] | NYMEX Natural Gas Futures NG December 2014 contracts, expiring November 2014 [Member]
Expiration date		November 2014
Open Futures Contracts, Long [Member] | United States Contracts [Member] | NYMEX Natural Gas Futures NG January 2015 contracts, expiring December 2014 [Member]
Expiration date		December 2014

X

- Definition

Amount of assets pledged to secure a debt instrument.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 470

-Section 50

-Paragraph 3

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

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- Definition

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

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-Name Regulation S-X (SX)

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 946

-SubTopic 320

-Section S99

-Paragraph 6

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-Name Accounting Standards Codification

-Topic 946

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