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FEES PAID BY THE FUND AND RELATED PARTY TRANSACTIONS - (Additional Information) (Details) (USD $) | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Fees Paid and Related Party Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |
USCF Management Fee |  |  |  |  |  |  |  |  | UNL is contractually obligated to pay USCF a fee, which is paid monthly, that is equal to 0.75% per annum of average daily total net assets. |  |
Estimated directors' fees and expenses |  |  |  |  |  |  |  |  | $ 6,009 us-gaap_NoninterestExpenseDirectorsFees | $ 7,620 us-gaap_NoninterestExpenseDirectorsFees | $ 5,705 us-gaap_NoninterestExpenseDirectorsFees
Licensing fee incurred |  |  |  |  |  |  |  |  | 2,879 us-gaap_LicenseCosts | 5,001 us-gaap_LicenseCosts | 5,674 us-gaap_LicenseCosts
Estimated investor tax reporting cost |  |  |  |  |  |  |  |  | 86,000 us-gaap_OtherGeneralExpense | 125,000 us-gaap_OtherGeneralExpense | 75,000 us-gaap_OtherGeneralExpense
Costs and expenses annual limit for reimbursement |  |  |  |  |  |  |  |  | 0.15%unl_PercentageOfChangeInCostsAndExpenses |  |
Expense waivers | (10,778)unl_ExpenseWaiver | (39,383)unl_ExpenseWaiver | (40,700)unl_ExpenseWaiver | (38,045)unl_ExpenseWaiver | (37,562)unl_ExpenseWaiver | (30,231)unl_ExpenseWaiver | (18,323)unl_ExpenseWaiver | (14,464)unl_ExpenseWaiver | (128,906)unl_ExpenseWaiver | (100,580)unl_ExpenseWaiver | (68,503)unl_ExpenseWaiver
Licensing Agreements [Member] |  |  |  |  |  |  |  |  |  |  |
Fees Paid and Related Party Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Fee percentage |  |  |  |  |  |  |  |  | 0.015%unl_BaseFeePercentage / us-gaap_TypeOfArrangementAxis = us-gaap_LicensingAgreementsMember |  |
Assets basis for determining fee percentage |  |  |  |  |  |  |  |  | on all net assets |  |
UNL [Member] | Related Public Funds [Member] |  |  |  |  |  |  |  |  |  |  |
Fees Paid and Related Party Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Estimated directors' fees and expenses |  |  |  |  |  |  |  |  | $ 567,863 us-gaap_NoninterestExpenseDirectorsFees / unl_PeriodAxis = unl_UnitedStates12MonthNaturalGasFundMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = unl_RelatedPublicFundsMember | $ 555,465 us-gaap_NoninterestExpenseDirectorsFees / unl_PeriodAxis = unl_UnitedStates12MonthNaturalGasFundMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = unl_RelatedPublicFundsMember | $ 540,586 us-gaap_NoninterestExpenseDirectorsFees / unl_PeriodAxis = unl_UnitedStates12MonthNaturalGasFundMember / us-gaap_RelatedPartyTransactionsByRelatedPartyAxis = unl_RelatedPublicFundsMember

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- Definition Costs incurred and are directly related to generating license revenue. Licensing arrangements include, but are not limited to, rights to use a patent, copyright, technology, manufacturing process, software or trademark. + 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 210.5-03.2(e)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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- Definition Description of the nature of payments to managing member or general partner for management of the day-to-day business functions of the limited liability company (LLC) or limited partnership (LP), including the fee rate, basis of calculation, relevant accounting period, whether the fee is paid to an entity other than the managing member or general partner, or whether the fee is waived. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 + Details
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