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Condensed Schedule of Investments (Parenthetical) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013
Debt Instrument, Collateral Amount | 5,525,172 us-gaap_DebtInstrumentCollateralAmount | 949,087 us-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

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