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Condensed Statement of Changes in Partners' Capital (USD $)
Total
General Partner [Member]
Limited Partners [Member]
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, beginning of period at Dec. 31, 2014 $ 13.69unl_NetAssetValuePerUnit    
Addition of 300,000 partnership shares 3,908,698us-gaap_PartnersCapitalAccountContributions 0us-gaap_PartnersCapitalAccountContributions
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_GeneralPartnerMember		 3,908,698us-gaap_PartnersCapitalAccountContributions
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_LimitedPartnerMember
Redemption of 150,000 partnership shares (1,990,063)us-gaap_PartnersCapitalAccountRedemptions 0us-gaap_PartnersCapitalAccountRedemptions
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_GeneralPartnerMember		 (1,990,063)us-gaap_PartnersCapitalAccountRedemptions
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_LimitedPartnerMember
Net income (loss) (1,341,500)us-gaap_NetIncomeLoss 0us-gaap_NetIncomeLoss
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_GeneralPartnerMember		 (1,341,500)us-gaap_NetIncomeLoss
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_LimitedPartnerMember
Balances at Mar. 31, 2015 $ 17,003,603us-gaap_PartnersCapital $ 0us-gaap_PartnersCapital
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_GeneralPartnerMember		 $ 17,003,603us-gaap_PartnersCapital
/ us-gaap_PartnerCapitalComponentsAxis
= us-gaap_LimitedPartnerMember
Net asset value, end of period at Mar. 31, 2015 $ 12.60unl_NetAssetValuePerUnit