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v2.4.1.9

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

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