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Statements of Changes in Partners' Capital (USD $)	Total	General Partner [Member]	Limited Partners
Beginning Balances at Dec. 31, 2011	$ 169,489,880us-gaap_PartnersCapital	$ 0us-gaap_PartnersCapital / us-gaap_PartnerCapitalComponentsAxis = us-gaap_GeneralPartnerMember	$ 169,489,880us-gaap_PartnersCapital / us-gaap_PartnerCapitalComponentsAxis = us-gaap_LimitedPartnerMember
Net asset value, beginning of year at Dec. 31, 2011	$ 43.46usl_NetAssetValuePerUnit
Addition of partnership shares	101,599,752us-gaap_PartnersCapitalAccountContributions	0us-gaap_PartnersCapitalAccountContributions / us-gaap_PartnerCapitalComponentsAxis = us-gaap_GeneralPartnerMember	101,599,752us-gaap_PartnersCapitalAccountContributions / us-gaap_PartnerCapitalComponentsAxis = us-gaap_LimitedPartnerMember
Redemption of partnership shares	(161,169,072)us-gaap_PartnersCapitalAccountRedemptions	0us-gaap_PartnersCapitalAccountRedemptions / us-gaap_PartnerCapitalComponentsAxis = us-gaap_GeneralPartnerMember	(161,169,072)us-gaap_PartnersCapitalAccountRedemptions / us-gaap_PartnerCapitalComponentsAxis = us-gaap_LimitedPartnerMember
Net income (loss)	(10,398,778)us-gaap_NetIncomeLoss	0us-gaap_NetIncomeLoss / us-gaap_PartnerCapitalComponentsAxis = us-gaap_GeneralPartnerMember	(10,398,778)us-gaap_NetIncomeLoss / us-gaap_PartnerCapitalComponentsAxis = us-gaap_LimitedPartnerMember
Ending Balances at Dec. 31, 2012	99,521,782us-gaap_PartnersCapital	0us-gaap_PartnersCapital / us-gaap_PartnerCapitalComponentsAxis = us-gaap_GeneralPartnerMember	99,521,782us-gaap_PartnersCapital / us-gaap_PartnerCapitalComponentsAxis = us-gaap_LimitedPartnerMember
Net asset value, end of year at Dec. 31, 2012	$ 39.81usl_NetAssetValuePerUnit
Addition of partnership shares	26,960,147us-gaap_PartnersCapitalAccountContributions	0us-gaap_PartnersCapitalAccountContributions / us-gaap_PartnerCapitalComponentsAxis = us-gaap_GeneralPartnerMember	26,960,147us-gaap_PartnersCapitalAccountContributions / us-gaap_PartnerCapitalComponentsAxis = us-gaap_LimitedPartnerMember
Redemption of partnership shares	(69,955,807)us-gaap_PartnersCapitalAccountRedemptions	0us-gaap_PartnersCapitalAccountRedemptions / us-gaap_PartnerCapitalComponentsAxis = us-gaap_GeneralPartnerMember	(69,955,807)us-gaap_PartnersCapitalAccountRedemptions / us-gaap_PartnerCapitalComponentsAxis = us-gaap_LimitedPartnerMember
Net income (loss)	5,578,244us-gaap_NetIncomeLoss	0us-gaap_NetIncomeLoss / us-gaap_PartnerCapitalComponentsAxis = us-gaap_GeneralPartnerMember	5,578,244us-gaap_NetIncomeLoss / us-gaap_PartnerCapitalComponentsAxis = us-gaap_LimitedPartnerMember
Ending Balances at Dec. 31, 2013	62,104,366us-gaap_PartnersCapital	0us-gaap_PartnersCapital / us-gaap_PartnerCapitalComponentsAxis = us-gaap_GeneralPartnerMember	62,104,366us-gaap_PartnersCapital / us-gaap_PartnerCapitalComponentsAxis = us-gaap_LimitedPartnerMember
Net asset value, end of year at Dec. 31, 2013	$ 42.83usl_NetAssetValuePerUnit
Addition of partnership shares	6,837,236us-gaap_PartnersCapitalAccountContributions	0us-gaap_PartnersCapitalAccountContributions / us-gaap_PartnerCapitalComponentsAxis = us-gaap_GeneralPartnerMember	6,837,236us-gaap_PartnersCapitalAccountContributions / us-gaap_PartnerCapitalComponentsAxis = us-gaap_LimitedPartnerMember
Redemption of partnership shares	(12,902,604)us-gaap_PartnersCapitalAccountRedemptions	0us-gaap_PartnersCapitalAccountRedemptions / us-gaap_PartnerCapitalComponentsAxis = us-gaap_GeneralPartnerMember	(12,902,604)us-gaap_PartnersCapitalAccountRedemptions / us-gaap_PartnerCapitalComponentsAxis = us-gaap_LimitedPartnerMember
Net income (loss)	(18,806,073)us-gaap_NetIncomeLoss	0us-gaap_NetIncomeLoss / us-gaap_PartnerCapitalComponentsAxis = us-gaap_GeneralPartnerMember	(18,806,073)us-gaap_NetIncomeLoss / us-gaap_PartnerCapitalComponentsAxis = us-gaap_LimitedPartnerMember
Ending Balances at Dec. 31, 2014	$ 37,232,925us-gaap_PartnersCapital	$ 0us-gaap_PartnersCapital / us-gaap_PartnerCapitalComponentsAxis = us-gaap_GeneralPartnerMember	$ 37,232,925us-gaap_PartnersCapital / us-gaap_PartnerCapitalComponentsAxis = us-gaap_LimitedPartnerMember
Net asset value, end of year at Dec. 31, 2014	$ 26.59usl_NetAssetValuePerUnit

X

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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The amount of ownership interest of different classes of partners in limited partnership.

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Total contributions made by each class of partners (i.e., general, limited and preferred partners).

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Total change in each class of partners' capital accounts during the year due to redemptions and adjustments to redemption value. All partners include general, limited and preferred partners.

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