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Statements of Changes in Partners' Capital (USD $)	Total	General Partner [Member]	Limited Partners [Member]
Balances at Dec. 31, 2011	$ 21,209,546us-gaap_PartnersCapital	$ 0us-gaap_PartnersCapital / us-gaap_PartnerCapitalComponentsAxis = us-gaap_GeneralPartnerMember	$ 21,209,546us-gaap_PartnersCapital / us-gaap_PartnerCapitalComponentsAxis = us-gaap_LimitedPartnerMember
Net asset value, beginning of year at Dec. 31, 2011	$ 21.21unl_NetAssetValuePerUnit
Addition of partnership shares	33,083,248us-gaap_PartnersCapitalAccountContributions	0us-gaap_PartnersCapitalAccountContributions / us-gaap_PartnerCapitalComponentsAxis = us-gaap_GeneralPartnerMember	33,083,248us-gaap_PartnersCapitalAccountContributions / us-gaap_PartnerCapitalComponentsAxis = us-gaap_LimitedPartnerMember
Redemption of partnership shares	(6,377,911)us-gaap_PartnersCapitalAccountRedemptions	0us-gaap_PartnersCapitalAccountRedemptions / us-gaap_PartnerCapitalComponentsAxis = us-gaap_GeneralPartnerMember	(6,377,911)us-gaap_PartnersCapitalAccountRedemptions / us-gaap_PartnerCapitalComponentsAxis = us-gaap_LimitedPartnerMember
Net income (loss)	(4,829,192)us-gaap_NetIncomeLoss	0us-gaap_NetIncomeLoss / us-gaap_PartnerCapitalComponentsAxis = us-gaap_GeneralPartnerMember	(4,829,192)us-gaap_NetIncomeLoss / us-gaap_PartnerCapitalComponentsAxis = us-gaap_LimitedPartnerMember
Balances at Dec. 31, 2012	43,085,691us-gaap_PartnersCapital	0us-gaap_PartnersCapital / us-gaap_PartnerCapitalComponentsAxis = us-gaap_GeneralPartnerMember	43,085,691us-gaap_PartnersCapital / us-gaap_PartnerCapitalComponentsAxis = us-gaap_LimitedPartnerMember
Net asset value, end of year at Dec. 31, 2012	$ 17.23unl_NetAssetValuePerUnit
Addition of partnership shares	5,962,931us-gaap_PartnersCapitalAccountContributions	0us-gaap_PartnersCapitalAccountContributions / us-gaap_PartnerCapitalComponentsAxis = us-gaap_GeneralPartnerMember	5,962,931us-gaap_PartnersCapitalAccountContributions / us-gaap_PartnerCapitalComponentsAxis = us-gaap_LimitedPartnerMember
Redemption of partnership shares	(25,655,241)us-gaap_PartnersCapitalAccountRedemptions	0us-gaap_PartnersCapitalAccountRedemptions / us-gaap_PartnerCapitalComponentsAxis = us-gaap_GeneralPartnerMember	(25,655,241)us-gaap_PartnersCapitalAccountRedemptions / us-gaap_PartnerCapitalComponentsAxis = us-gaap_LimitedPartnerMember
Net income (loss)	4,089,602us-gaap_NetIncomeLoss	0us-gaap_NetIncomeLoss / us-gaap_PartnerCapitalComponentsAxis = us-gaap_GeneralPartnerMember	4,089,602us-gaap_NetIncomeLoss / us-gaap_PartnerCapitalComponentsAxis = us-gaap_LimitedPartnerMember
Balances at Dec. 31, 2013	27,482,983us-gaap_PartnersCapital	0us-gaap_PartnersCapital / us-gaap_PartnerCapitalComponentsAxis = us-gaap_GeneralPartnerMember	27,482,983us-gaap_PartnersCapital / us-gaap_PartnerCapitalComponentsAxis = us-gaap_LimitedPartnerMember
Net asset value, end of year at Dec. 31, 2013	$ 18.32unl_NetAssetValuePerUnit
Addition of partnership shares	4,902,725us-gaap_PartnersCapitalAccountContributions	0us-gaap_PartnersCapitalAccountContributions / us-gaap_PartnerCapitalComponentsAxis = us-gaap_GeneralPartnerMember	4,902,725us-gaap_PartnersCapitalAccountContributions / us-gaap_PartnerCapitalComponentsAxis = us-gaap_LimitedPartnerMember
Redemption of partnership shares	(11,987,259)us-gaap_PartnersCapitalAccountRedemptions	0us-gaap_PartnersCapitalAccountRedemptions / us-gaap_PartnerCapitalComponentsAxis = us-gaap_GeneralPartnerMember	(11,987,259)us-gaap_PartnersCapitalAccountRedemptions / us-gaap_PartnerCapitalComponentsAxis = us-gaap_LimitedPartnerMember
Net income (loss)	(3,971,981)us-gaap_NetIncomeLoss	0us-gaap_NetIncomeLoss / us-gaap_PartnerCapitalComponentsAxis = us-gaap_GeneralPartnerMember	(3,971,981)us-gaap_NetIncomeLoss / us-gaap_PartnerCapitalComponentsAxis = us-gaap_LimitedPartnerMember
Balances at Dec. 31, 2014	$ 16,426,468us-gaap_PartnersCapital	$ 0us-gaap_PartnersCapital / us-gaap_PartnerCapitalComponentsAxis = us-gaap_GeneralPartnerMember	$ 16,426,468us-gaap_PartnersCapital / us-gaap_PartnerCapitalComponentsAxis = us-gaap_LimitedPartnerMember
Net asset value, end of year at Dec. 31, 2014	$ 13.69unl_NetAssetValuePerUnit

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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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