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CONTRACTS AND AGREEMENTS (Additional Information) (Details) (USD $) | 3 Months Ended
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Mar. 31, 2015
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items] |
Annual Fee for transfer agency services | $ 20,000 us-gaap_NoninterestExpenseTransferAgentAndCustodianFees
Maximum [Member] |
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items] |
Transaction fees per transaction | 15 unl_TransactionFeesPaid / us-gaap_RangeAxis = us-gaap_MaximumMember
Commissions per round-turn trade, including applicable exchange and NFA fees for Natural Gas-Related Futures Contracts and options on Futures Contracts | 15 unl_CommissionsPaid / us-gaap_RangeAxis = us-gaap_MaximumMember
Minimum [Member] |
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items] |
Annual Fee for custody, fund accounting and fund administration services | 75,000 us-gaap_CustodyFees / us-gaap_RangeAxis = us-gaap_MinimumMember
Transaction fees per transaction | 7 unl_TransactionFeesPaid / us-gaap_RangeAxis = us-gaap_MinimumMember
Commissions per round-turn trade, including applicable exchange and NFA fees for Natural Gas-Related Futures Contracts and options on Futures Contracts | 7 unl_CommissionsPaid / us-gaap_RangeAxis = us-gaap_MinimumMember
first $500 million of the Related Public Funds' combined net assets [Member] |
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items] |
Fee percentage | 0.06%unl_BaseFeePercentage / invest_InvestmentIdentifierSchemeAxis = unl_GroupSixMember
first $500 million of the Related Public Funds' combined net assets [Member] | Maximum [Member] |
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items] |
Base amount for determining fee percentage | 500,000,000 unl_BasisAmountForFeePercentage / invest_InvestmentIdentifierSchemeAxis = unl_GroupSixMember / us-gaap_RangeAxis = us-gaap_MaximumMember
Related Public Funds' combined net assets greater than $500 million but less than $1 billion [Member] |
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items] |
Fee percentage | 0.0465%unl_BaseFeePercentage / invest_InvestmentIdentifierSchemeAxis = unl_GroupSevenMember
Related Public Funds' combined net assets greater than $500 million but less than $1 billion [Member] | Maximum [Member] |
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items] |
Base amount for determining fee percentage | 1,000,000,000 unl_BasisAmountForFeePercentage / invest_InvestmentIdentifierSchemeAxis = unl_GroupSevenMember / us-gaap_RangeAxis = us-gaap_MaximumMember
Related Public Funds' combined net assets greater than $500 million but less than $1 billion [Member] | Minimum [Member] |
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items] |
Base amount for determining fee percentage | 500,000,000 unl_BasisAmountForFeePercentage / invest_InvestmentIdentifierSchemeAxis = unl_GroupSevenMember / us-gaap_RangeAxis = us-gaap_MinimumMember
Related Public Funds' combined net assets exceed $1 billion [Member] |
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items] |
Fee percentage | 0.035%unl_BaseFeePercentage / invest_InvestmentIdentifierSchemeAxis = unl_GroupEightMember
Related Public Funds' combined net assets exceed $1 billion [Member] | Minimum [Member] |
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items] |
Base amount for determining fee percentage | 1,000,000,000 unl_BasisAmountForFeePercentage / invest_InvestmentIdentifierSchemeAxis = unl_GroupEightMember / us-gaap_RangeAxis = us-gaap_MinimumMember
Marketing Agent And Affliate Of Uscf [Member] |
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items] |
Maximum Aggregate Compensation Paid For Distribution Related Services | 10.00%unl_MaximumAggregateCompensationPaidForDistributionRelatedServices / invest_InvestmentIdentifierSchemeAxis = unl_MarketingAgentAndAffliateOfUscfMember
Marketing Agreement [Member] | UNL's assets up to $3 billion [Member] |
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items] |
Fee percentage | 0.06%unl_BaseFeePercentage / invest_InvestmentIdentifierSchemeAxis = unl_GroupFourMember / us-gaap_TypeOfArrangementAxis = unl_MarketingAgreementMember
Marketing Agreement [Member] | UNL's assets in excess of $3 billion [Member] |
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items] |
Fee percentage | 0.04%unl_BaseFeePercentage / invest_InvestmentIdentifierSchemeAxis = unl_GroupFiveMember / us-gaap_TypeOfArrangementAxis = unl_MarketingAgreementMember
Marketing Agreement [Member] | UNL's assets in excess of $3 billion [Member] | Minimum [Member] |
Long-Duration Contracts, Assumptions by Product and Guarantee [Line Items] |
Base amount for determining fee percentage | $ 3,000,000,000 unl_BasisAmountForFeePercentage / invest_InvestmentIdentifierSchemeAxis = unl_GroupFiveMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_TypeOfArrangementAxis = unl_MarketingAgreementMember

X
- Definition Base Fee Percentage + References No definition available. + Details
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Namespace Prefix: | unl_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Basis Amount for Fee Percentage + References No definition available. + Details
Name: | unl_BasisAmountForFeePercentage
Namespace Prefix: | unl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Commissions Paid + References No definition available. + Details
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Namespace Prefix: | unl_
Data Type: | us-types:perUnitItemType
Balance Type: | na
Period Type: | duration

X
- Definition Maximum percentage of gross proceeds from offering paid for distribution related services as compensation. + References No definition available. + Details
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Namespace Prefix: | unl_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Transaction Fees Paid + References No definition available. + Details
Name: | unl_TransactionFeesPaid
Namespace Prefix: | unl_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Those fees charged for services related to holding, advising, and managing customer investment assets. These account fees usually charged annually or semi-annually, on a per security basis, for the costs of services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.3) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Fees paid to an agent employed by a corporation or mutual fund to maintain shareholder records, including purchases, sales, and account balances. Also includes custodian fees incurred during an accounting period from an agent, bank, trust company, or other organization that holds and safeguards an individual's, mutual fund's, or investment company's assets for them. These fees will be billed back to the client and are a component of noninterest expense. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.14) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
Name: | us-gaap_NoninterestExpenseTransferAgentAndCustodianFees
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
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Namespace Prefix: |
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Period Type: |

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- Details
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Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | invest_InvestmentIdentifierSchemeAxis=unl_MarketingAgentAndAffliateOfUscfMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |