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Statements of Operations (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Gain (loss) on trading of commodity futures contracts:
Realized gain (loss) on closed positions	$ 402,190us-gaap_GainLossOnSaleOfInvestments	$ 6,302,760us-gaap_GainLossOnSaleOfInvestments	$ (6,954,520)us-gaap_GainLossOnSaleOfInvestments
Change in unrealized gain (loss) on open positions	(18,738,510)us-gaap_UnrealizedGainLossOnInvestments	85,540us-gaap_UnrealizedGainLossOnInvestments	(2,445,210)us-gaap_UnrealizedGainLossOnInvestments
Dividend income	10,129us-gaap_DividendIncomeOperating	18,055us-gaap_DividendIncomeOperating	28,563us-gaap_DividendIncomeOperating
Interest income	5,708us-gaap_InterestIncomeOperating	6,576us-gaap_InterestIncomeOperating	9,817us-gaap_InterestIncomeOperating
ETF transaction fees	3,150us-gaap_OtherIncome	8,050us-gaap_OtherIncome	12,950us-gaap_OtherIncome
Total income (loss)	(18,317,333)us-gaap_Revenues	6,420,981us-gaap_Revenues	(9,348,400)us-gaap_Revenues
Expenses
General Partner management fees (Note 3)	316,392us-gaap_AssetManagementCosts	510,978us-gaap_AssetManagementCosts	807,686us-gaap_AssetManagementCosts
Professional fees	142,796us-gaap_ProfessionalFees	207,412us-gaap_ProfessionalFees	130,520us-gaap_ProfessionalFees
Brokerage commissions	4,643us-gaap_FloorBrokerageExchangeAndClearanceFees	9,848us-gaap_FloorBrokerageExchangeAndClearanceFees	21,804us-gaap_FloorBrokerageExchangeAndClearanceFees
Directors' fees and insurance	15,649us-gaap_NoninterestExpenseDirectorsFees	19,340us-gaap_NoninterestExpenseDirectorsFees	25,332us-gaap_NoninterestExpenseDirectorsFees
License fees	7,910us-gaap_LicenseCosts	12,774us-gaap_LicenseCosts	20,192us-gaap_LicenseCosts
Registration fees	1,350usl_RegistrationFeesAndOtherOfferingExpenses	82,385usl_RegistrationFeesAndOtherOfferingExpenses	44,844usl_RegistrationFeesAndOtherOfferingExpenses
Total expenses	488,740us-gaap_OperatingExpenses	842,737us-gaap_OperatingExpenses	1,050,378us-gaap_OperatingExpenses
Net income (loss)	$ (18,806,073)us-gaap_NetIncomeLoss	$ 5,578,244us-gaap_NetIncomeLoss	$ (10,398,778)us-gaap_NetIncomeLoss
Net income (loss) per limited partnership share	$ (16.24)us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax	$ 3.02us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax	$ (3.65)us-gaap_NetIncomeLossPerOutstandingLimitedPartnershipUnitBasicNetOfTax
Net income (loss) per weighted average limited partnership share	$ (14.92)us-gaap_NetIncomeLossNetOfTaxPerOutstandingLimitedPartnershipUnitDiluted	$ 2.71us-gaap_NetIncomeLossNetOfTaxPerOutstandingLimitedPartnershipUnitDiluted	$ (3.24)us-gaap_NetIncomeLossNetOfTaxPerOutstandingLimitedPartnershipUnitDiluted
Weighted average limited partnership shares outstanding	1,260,685us-gaap_WeightedAverageLimitedPartnershipUnitsOutstanding	2,061,096us-gaap_WeightedAverageLimitedPartnershipUnitsOutstanding	3,205,464us-gaap_WeightedAverageLimitedPartnershipUnitsOutstanding

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