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TREASURY UNITS (Details) - 10Q (USD $) | 0 Months Ended | 3 Months Ended | 91 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 10, 2015 | Aug. 08, 2008 | Aug. 20, 2007 | Mar. 31, 2015 | Mar. 31, 2014 | Mar. 31, 2015 | Mar. 06, 2008 | Jan. 30, 2008 | Jan. 15, 2008 | Jan. 03, 2012
Treasury units |  |  |  | 53,381 nen_PartnersCapitalAccountTreasuryUnitsIssued |  | 53,381 nen_PartnersCapitalAccountTreasuryUnitsIssued |  |  |  |
Period for repurchase of depository receipts | 5 years | 12 months | 12 months |  |  |  |  |  |  |
Depository receipts authorized to be repurchased | 2,000,000 nen_PartnersCapitalAccountDepositoryReceiptsTreasuryReceiptsAuthorizedToBeRepurchased |  | 300,000 nen_PartnersCapitalAccountDepositoryReceiptsTreasuryReceiptsAuthorizedToBeRepurchased |  |  |  | 1,500,000 nen_PartnersCapitalAccountDepositoryReceiptsTreasuryReceiptsAuthorizedToBeRepurchased | 900,000 nen_PartnersCapitalAccountDepositoryReceiptsTreasuryReceiptsAuthorizedToBeRepurchased | 600,000 nen_PartnersCapitalAccountDepositoryReceiptsTreasuryReceiptsAuthorizedToBeRepurchased |
Repurchase of depository receipts |  |  |  | 19,415 nen_PartnersCapitalAccountDepositoryReceiptsTreasury |  | 1,306,331 nen_PartnersCapitalAccountDepositoryReceiptsTreasury |  |  |  |
Repurchase price of depository receipts |  |  |  | $ 50.00 nen_PartnersCapitalAccountDepositoryReceiptsTreasuryAverageRepurchasePricePerDepositoryReceipt |  | $ 26.01 nen_PartnersCapitalAccountDepositoryReceiptsTreasuryAverageRepurchasePricePerDepositoryReceipt |  |  |  |
Repurchase price of units |  |  |  | $ 1,500.00 nen_PartnersCapitalAccountUnitsTreasuryAverageRepurchasePricePerUnit |  |  |  |  |  |
Repurchase of units |  |  |  | 809 us-gaap_PartnersCapitalAccountUnitsTreasury | 271 us-gaap_PartnersCapitalAccountUnitsTreasury |  |  |  |  |
Total cost of repurchase |  |  |  | $ 1,218,440 us-gaap_PartnersCapitalAccountTreasuryUnitsPurchases | $ 379,409 us-gaap_PartnersCapitalAccountTreasuryUnitsPurchases | $ 36,385,000 us-gaap_PartnersCapitalAccountTreasuryUnitsPurchases |  |  |  |
Repurchase of depository receipts |  |  |  | 975,731 nen_PartnersCapitalAccountDepositoryReceiptsTreasuryRepurchased |  |  |  |  |  |
Class A |  |  |  |  |  |  |  |  |  |
Treasury units |  |  |  | 42,704 nen_PartnersCapitalAccountTreasuryUnitsIssued / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = nen_LimitedClassAMember |  | 42,704 nen_PartnersCapitalAccountTreasuryUnitsIssued / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = nen_LimitedClassAMember |  |  |  |
Number of units in each depository receipt |  |  | 0.1 dei_EntityListingDepositoryReceiptRatio / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = nen_LimitedClassAMember |  |  |  |  |  |  | 0.03333 dei_EntityListingDepositoryReceiptRatio / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = nen_LimitedClassAMember
Fixed distribution percentage of unit holders |  |  |  | 80.00%nen_PartnersCapitalAccountFixedDistributionPercentageOfHoldersOfUnits / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = nen_LimitedClassAMember |  |  |  |  |  |
Repurchase price of units |  |  |  |  |  | $ 780.30 nen_PartnersCapitalAccountUnitsTreasuryAverageRepurchasePricePerUnit / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = nen_LimitedClassAMember |  |  |  |
Total cost of repurchase |  |  |  | 975,731 us-gaap_PartnersCapitalAccountTreasuryUnitsPurchases / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = nen_LimitedClassAMember | 305,230 us-gaap_PartnersCapitalAccountTreasuryUnitsPurchases / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = nen_LimitedClassAMember |  |  |  |  |
Class B |  |  |  |  |  |  |  |  |  |
Treasury units |  |  |  | 10,143 nen_PartnersCapitalAccountTreasuryUnitsIssued / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = nen_LimitedClassBMember |  | 10,143 nen_PartnersCapitalAccountTreasuryUnitsIssued / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = nen_LimitedClassBMember |  |  |  |
Fixed distribution percentage of unit holders |  |  |  | 19.00%nen_PartnersCapitalAccountFixedDistributionPercentageOfHoldersOfUnits / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = nen_LimitedClassBMember |  |  |  |  |  |
Repurchase of depository receipts |  |  |  |  |  | 2,605 nen_PartnersCapitalAccountDepositoryReceiptsTreasury / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = nen_LimitedClassBMember |  |  |  |
Repurchase price of units |  |  |  |  |  | $ 812.50 nen_PartnersCapitalAccountUnitsTreasuryAverageRepurchasePricePerUnit / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = nen_LimitedClassBMember |  |  |  |
Repurchase of units |  |  |  | 154 us-gaap_PartnersCapitalAccountUnitsTreasury / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = nen_LimitedClassBMember |  |  |  |  |  |
Total cost of repurchase |  |  |  | 230,574 us-gaap_PartnersCapitalAccountTreasuryUnitsPurchases / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = nen_LimitedClassBMember | 70,470 us-gaap_PartnersCapitalAccountTreasuryUnitsPurchases / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = nen_LimitedClassBMember |  |  |  |  |
General Partnership |  |  |  |  |  |  |  |  |  |
Treasury units |  |  |  | 534 nen_PartnersCapitalAccountTreasuryUnitsIssued / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = us-gaap_GeneralPartnerMember |  | 534 nen_PartnersCapitalAccountTreasuryUnitsIssued / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = us-gaap_GeneralPartnerMember |  |  |  |
Fixed distribution percentage of unit holders |  |  |  | 1.00%nen_PartnersCapitalAccountFixedDistributionPercentageOfHoldersOfUnits / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = us-gaap_GeneralPartnerMember |  |  |  |  |  |
Repurchase of depository receipts |  |  |  |  |  | 137 nen_PartnersCapitalAccountDepositoryReceiptsTreasury / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = us-gaap_GeneralPartnerMember |  |  |  |
Repurchase of units |  |  |  | 8 us-gaap_PartnersCapitalAccountUnitsTreasury / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = us-gaap_GeneralPartnerMember |  |  |  |  |  |
Total cost of repurchase |  |  |  | $ 12,135 us-gaap_PartnersCapitalAccountTreasuryUnitsPurchases / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = us-gaap_GeneralPartnerMember | $ 3,709 us-gaap_PartnersCapitalAccountTreasuryUnitsPurchases / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = us-gaap_GeneralPartnerMember |  |  |  |  |

X
- Definition The number of underlying shares represented by one American Depository Receipt (ADR) or Global Depository Receipt (GDR). A value of "3" means that one ADR represents 3 underlying shares. If one underlying share represents 2 ADR's then the value would be represented as "0.5". + References No definition available. + Details
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X
- Definition Represents the number of depository receipts repurchased under the equity repurchase program. + References No definition available. + Details
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Namespace Prefix: | nen_
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X
- Definition Represents the average price at which depository receipts are repurchased under the equity repurchase program. + References No definition available. + Details
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Namespace Prefix: | nen_
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X
- Definition Represents the number of depository receipts authorized to be repurchased under the equity repurchase program. + References No definition available. + Details
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Namespace Prefix: | nen_
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- Definition Represents the amount of depository receipts repurchased under the equity repurchase program. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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- Definition Represents the fixed distribution percentages of the holders of units based on which the entity is required to purchase the proportionate number of specific units with every purchase of depository receipts. + References No definition available. + Details
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Namespace Prefix: | nen_
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X
- Definition Represents the period over which the entity is permitted to purchase its depository receipts. + References No definition available. + Details
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- Definition Represents the number of treasury units outstanding as on the balance sheet date. + References No definition available. + Details
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- Definition Represents the average price at which units are repurchased under the equity repurchase program. + References No definition available. + Details
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Namespace Prefix: | nen_
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X
- Definition Value of units that were previously issued and have been repurchased during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 272 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6828210&loc=d3e70191-108054 + Details
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- Definition Units that were previously issued and have been repurchased during the year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 5 -Subparagraph (SAB TOPIC 4.F) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187171-122770 + Details
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- Details
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- Details
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- Details
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