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Statements of Financial Condition (USD $)	Dec. 31, 2014	Dec. 31, 2013
Assets
Cash and cash equivalents (Notes 2 and 5)	$ 33,464,533us-gaap_CashAndCashEquivalentsAtCarryingValue	$ 59,384,208us-gaap_CashAndCashEquivalentsAtCarryingValue
Equity in trading accounts:
Cash and cash equivalents	19,785,491us-gaap_Cash	3,548,144us-gaap_Cash
Unrealized gain (loss) on open commodity futures	(17,096,060)usl_UnrealizedGainLossOnOpenCommodityFuturesContracts	1,642,450usl_UnrealizedGainLossOnOpenCommodityFuturesContracts
Receivable for units sold	1,329,738usl_ReceivableForUnitsSold	0usl_ReceivableForUnitsSold
Dividends receivable	640us-gaap_DividendsReceivable	1,218us-gaap_DividendsReceivable
ETF transaction fees receivable	350us-gaap_OtherReceivables	350us-gaap_OtherReceivables
Total assets	37,484,692us-gaap_Assets	64,576,370us-gaap_Assets
Liabilities and Partners' Capital
Investment payable	0us-gaap_TradingLiabilities	2,141,524us-gaap_TradingLiabilities
General Partner management fees payable (Note 3)	17,971us-gaap_DueToOfficersOrStockholdersCurrentAndNoncurrent	32,864us-gaap_DueToOfficersOrStockholdersCurrentAndNoncurrent
Professional fees payable	230,056us-gaap_AccruedProfessionalFeesCurrentAndNoncurrent	291,402us-gaap_AccruedProfessionalFeesCurrentAndNoncurrent
Brokerage commissions payable	2,012us-gaap_CommissionsPayableToBrokerDealersAndClearingOrganizations	2,212us-gaap_CommissionsPayableToBrokerDealersAndClearingOrganizations
Directors' fees and insurance payable	16us-gaap_ManagementFeePayable	1,062us-gaap_ManagementFeePayable
License fees payable	1,712usl_LicenseFeesPayableCurrentAndNoncurrent	2,787usl_LicenseFeesPayableCurrentAndNoncurrent
Registration fees payable	0us-gaap_AccountsPayableOtherCurrentAndNoncurrent	153us-gaap_AccountsPayableOtherCurrentAndNoncurrent
Total liabilities	251,767us-gaap_Liabilities	2,472,004us-gaap_Liabilities
Commitments and Contingencies (Notes 3, 4 and 5)
Partners' Capital
General Partner	0us-gaap_GeneralPartnersCapitalAccount	0us-gaap_GeneralPartnersCapitalAccount
Limited Partners	37,232,925us-gaap_LimitedPartnersCapitalAccount	62,104,366us-gaap_LimitedPartnersCapitalAccount
Total Partners' Capital	37,232,925us-gaap_PartnersCapital	62,104,366us-gaap_PartnersCapital
Total liabilities and partners' capital	$ 37,484,692us-gaap_LiabilitiesAndStockholdersEquity	$ 64,576,370us-gaap_LiabilitiesAndStockholdersEquity
Limited Partners' shares outstanding	1,400,000us-gaap_LimitedPartnersCapitalAccountUnitsOutstanding	1,450,000us-gaap_LimitedPartnersCapitalAccountUnitsOutstanding
Net asset value per share	$ 26.59usl_NetAssetValuePerUnit	$ 42.83usl_NetAssetValuePerUnit
Market value per share	$ 26.82usl_MarketValuePerUnit	$ 42.88usl_MarketValuePerUnit

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Name:	usl_MarketValuePerUnit
Namespace Prefix:	usl_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Net asset value per unit.

+ References

No definition available.

+ Details

Name:	usl_NetAssetValuePerUnit
Namespace Prefix:	usl_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Receivable For Units Sold.

+ References

No definition available.

+ Details

Name:	usl_ReceivableForUnitsSold
Namespace Prefix:	usl_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Unrealized gain (loss) on open commodity futures contracts.

+ References

No definition available.

+ Details

Name:	usl_UnrealizedGainLossOnOpenCommodityFuturesContracts
Namespace Prefix:	usl_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant