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Statements of Financial Condition (USD $)	Mar. 31, 2015	Dec. 31, 2014
Assets
Cash and cash equivalents (Notes 2 and 5)	$ 66,299,966us-gaap_CashAndCashEquivalentsAtCarryingValue	$ 33,464,533us-gaap_CashAndCashEquivalentsAtCarryingValue
Equity in trading accounts:
Cash and cash equivalents	21,607,192us-gaap_Cash	19,785,491us-gaap_Cash
Unrealized gain (loss) on open commodity futures contracts	(15,855,783)usl_UnrealizedGainLossOnOpenCommodityFuturesContracts	(17,096,060)usl_UnrealizedGainLossOnOpenCommodityFuturesContracts
Receivable for shares sold	0usl_ReceivableForUnitsSold	1,329,738usl_ReceivableForUnitsSold
Dividends receivable	612us-gaap_DividendsReceivable	640us-gaap_DividendsReceivable
Directors' fees and insurance receivable	1,659us-gaap_AccountsReceivableRelatedParties	0us-gaap_AccountsReceivableRelatedParties
ETF transaction fees	0us-gaap_OtherReceivables	350us-gaap_OtherReceivables
Total assets	72,053,646us-gaap_Assets	37,484,692us-gaap_Assets
Liabilities and Partners' Capital
Professional fees payable	129,296us-gaap_AccruedProfessionalFeesCurrentAndNoncurrent	230,056us-gaap_AccruedProfessionalFeesCurrentAndNoncurrent
General Partner management fees payable (Note 3)	37,491us-gaap_DueToOfficersOrStockholdersCurrentAndNoncurrent	17,971us-gaap_DueToOfficersOrStockholdersCurrentAndNoncurrent
License fees payable	2,499usl_LicenseFeesPayableCurrentAndNoncurrent	1,712usl_LicenseFeesPayableCurrentAndNoncurrent
Directors' fees and insurance payable	0us-gaap_ManagementFeePayable	16us-gaap_ManagementFeePayable
Brokerage commissions payable	4,262us-gaap_CommissionsPayableToBrokerDealersAndClearingOrganizations	2,012us-gaap_CommissionsPayableToBrokerDealersAndClearingOrganizations
Total liabilities	173,548us-gaap_Liabilities	251,767us-gaap_Liabilities
Partners' Capital
General Partner	0us-gaap_GeneralPartnersCapitalAccount	0us-gaap_GeneralPartnersCapitalAccount
Limited Partners	71,880,098us-gaap_LimitedPartnersCapitalAccount	37,232,925us-gaap_LimitedPartnersCapitalAccount
Total Partners' Capital	71,880,098us-gaap_PartnersCapital	37,232,925us-gaap_PartnersCapital
Total liabilities and partners' capital	$ 72,053,646us-gaap_LiabilitiesAndStockholdersEquity	$ 37,484,692us-gaap_LiabilitiesAndStockholdersEquity
Limited Partners' shares outstanding	3,000,000us-gaap_LimitedPartnersCapitalAccountUnitsOutstanding	1,400,000us-gaap_LimitedPartnersCapitalAccountUnitsOutstanding
Net asset value per share	$ 23.96usl_NetAssetValuePerUnit	$ 26.59usl_NetAssetValuePerUnit
Market value per share	$ 23.9usl_MarketValuePerUnit	$ 26.82usl_MarketValuePerUnit

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