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v2.4.1.9

SUBSEQUENT EVENTS (Details) (USD $) | 0 Months Ended | 12 Months Ended | 76 Months Ended | 88 Months Ended | 1 Months Ended | 2 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 10, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2014 | Feb. 28, 2014 | Mar. 10, 2015 | Mar. 06, 2008 | Jan. 30, 2008 | Jan. 15, 2008 | Aug. 20, 2007
Subsequent events |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchase of depository receipts |  | 44,025 nen_PartnersCapitalAccountDepositoryReceiptsTreasury | 22,964 nen_PartnersCapitalAccountDepositoryReceiptsTreasury |  | 1,286,916 nen_PartnersCapitalAccountDepositoryReceiptsTreasury |  | 1,286,916 nen_PartnersCapitalAccountDepositoryReceiptsTreasury |  |  |  |  |  |
Repurchase price of depository receipts |  | $ 47.90 nen_PartnersCapitalAccountDepositoryReceiptsTreasuryAverageRepurchasePricePerDepositoryReceipt | $ 37.80 nen_PartnersCapitalAccountDepositoryReceiptsTreasuryAverageRepurchasePricePerDepositoryReceipt |  |  | $ 25.65 nen_PartnersCapitalAccountDepositoryReceiptsTreasuryAverageRepurchasePricePerDepositoryReceipt |  |  |  |  |  |  |
Repurchase price of units |  | $ 1,437 nen_PartnersCapitalAccountUnitsTreasuryAverageRepurchasePricePerUnit | $ 1,134 nen_PartnersCapitalAccountUnitsTreasuryAverageRepurchasePricePerUnit |  |  |  |  |  |  |  |  |  |
Repurchase of units |  | 1,834 us-gaap_PartnersCapitalAccountUnitsTreasury | 957 us-gaap_PartnersCapitalAccountUnitsTreasury | 1,040 us-gaap_PartnersCapitalAccountUnitsTreasury |  |  |  |  |  |  |  |  |
Total cost of repurchase |  | $ 2,685,583 us-gaap_PartnersCapitalAccountTreasuryUnitsPurchases | $ 1,094,609 us-gaap_PartnersCapitalAccountTreasuryUnitsPurchases | $ 906,214 us-gaap_PartnersCapitalAccountTreasuryUnitsPurchases |  | $ 35,167,000 us-gaap_PartnersCapitalAccountTreasuryUnitsPurchases |  |  |  |  |  |  |
Gain on the sale |  |  | 3,678,839 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax |  |  |  |  |  |  |  |  |  |
Depository receipts authorized to be repurchased | 2,000,000 nen_PartnersCapitalAccountDepositoryReceiptsTreasuryReceiptsAuthorizedToBeRepurchased |  |  |  |  |  |  |  | 2,000,000 nen_PartnersCapitalAccountDepositoryReceiptsTreasuryReceiptsAuthorizedToBeRepurchased | 1,500,000 nen_PartnersCapitalAccountDepositoryReceiptsTreasuryReceiptsAuthorizedToBeRepurchased | 900,000 nen_PartnersCapitalAccountDepositoryReceiptsTreasuryReceiptsAuthorizedToBeRepurchased | 600,000 nen_PartnersCapitalAccountDepositoryReceiptsTreasuryReceiptsAuthorizedToBeRepurchased | 300,000 nen_PartnersCapitalAccountDepositoryReceiptsTreasuryReceiptsAuthorizedToBeRepurchased
Repurchase program extension (In years) | 5 years |  |  |  |  |  |  |  |  |  |  |  |
Hamilton Bay Apartments |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent events |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on the sale |  | 0 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax / us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis = nen_HamiltonBayApartmentsLLCMember |  |  |  |  |  |  |  |  |  |  |
Mortgages payable | Linhart L.P. Residential/Commercial Newton, Massachusetts |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent events |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of mortgage paid off |  |  |  |  |  |  |  | 1,926,000 us-gaap_RepaymentsOfDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nen_LinhartLPResidentialCommercialNewtonMassachusettsMember |  |  |  |  |
Mortgages payable | Hamilton Linewt LLC Commercial-1031Exchange Newton, Massachusetts |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent events |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of mortgage paid off |  |  |  |  |  |  |  | 1,466,000 us-gaap_RepaymentsOfDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nen_HamiltonLinewtLLCCommercial1031ExchangeNewtonMassachusettsMember |  |  |  |  |
Subsequent event |  |  |  |  |  |  |  |  |  |  |  |  |
Subsequent events |  |  |  |  |  |  |  |  |  |  |  |  |
Repurchase of depository receipts |  |  |  |  |  |  |  |  | 19,415 nen_PartnersCapitalAccountDepositoryReceiptsTreasury / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |  |
Repurchase price of depository receipts |  |  |  |  |  |  |  |  | $ 50.00 nen_PartnersCapitalAccountDepositoryReceiptsTreasuryAverageRepurchasePricePerDepositoryReceipt / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |  |
Repurchase price of units |  |  |  |  |  |  |  |  | $ 1,500.00 nen_PartnersCapitalAccountUnitsTreasuryAverageRepurchasePricePerUnit / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |  |
Repurchase of depository receipts |  |  |  |  |  |  |  |  | $ 975,731 nen_PartnersCapitalAccountDepositoryReceiptsTreasuryRepurchased / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |  |

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