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MORTGAGE NOTES PAYABLE (Details) - 10Q (USD $) | 3 Months Ended | 0 Months Ended | 1 Months Ended | 0 Months Ended
--- | --- | --- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Jul. 31, 2014 | Jun. 11, 2014 | Feb. 28, 2014 | Jul. 11, 2014
MORTGAGE NOTES PAYABLE |  |  |  |  |  |
Effective interest rate (as a percent) | 5.36%us-gaap_DebtInstrumentInterestRateEffectivePercentage |  |  |  |  |
Annual maturities of mortgage debt |  |  |  |  |  |
2015-current maturities | $ 285,000 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextRollingTwelveMonths |  |  |  |  |
2016 | 1,439,000 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInRollingYearTwo |  |  |  |  |
2017 | 1,801,000 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInRollingYearThree |  |  |  |  |
2018 | 7,880,000 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInRollingYearFour |  |  |  |  |
2019 | 1,963,000 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInRollingYearFive |  |  |  |  |
Thereafter | 182,671,000 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInRollingAfterYearFive |  |  |  |  |
Total | 196,039,000 us-gaap_LongTermDebt |  |  |  |  |
Long-term Debt, Maturities, Repayments of Principal in Next Rolling Twelve Months | 285,000 us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextRollingTwelveMonths |  |  |  |  |
Additional disclosures related to mortgages |  |  |  |  |  |
Amount of new loan | 8,076,000 us-gaap_ProceedsFromIssuanceOfDebt |  |  |  |  |
Repurchase of depository receipts | 975,731 nen_PartnersCapitalAccountDepositoryReceiptsTreasuryRepurchased |  |  |  |  |
Repurchase of units | 809 us-gaap_PartnersCapitalAccountUnitsTreasury | 271 us-gaap_PartnersCapitalAccountUnitsTreasury |  |  |  |
Line of Credit |  |  |  |  |  |
Additional disclosures related to mortgages |  |  |  |  |  |
Term of debt |  |  | 3 years |  |  |
Maximum borrowings |  |  | 25,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = us-gaap_LineOfCreditMember |  |  |
Funds drawn by the company | 0 nen_Nen_FundsDrawnByEntity / us-gaap_CreditFacilityAxis = us-gaap_LineOfCreditMember |  |  |  |  |
Number of properties in which borrowing amount collateralized |  |  | 23 us-gaap_NumberOfRealEstateProperties / us-gaap_CreditFacilityAxis = us-gaap_LineOfCreditMember |  |  |
Amount of refinancing costs |  |  | 125,000 us-gaap_DebtInstrumentFeeAmount / us-gaap_CreditFacilityAxis = us-gaap_LineOfCreditMember |  |  |
Base Rate [Member] | Line of Credit |  |  |  |  |  |
Additional disclosures related to mortgages |  |  |  |  |  |
Reference rate used in calculation of Base Rate |  |  | base |  |  |
Prime Rate [Member] | Line of Credit |  |  |  |  |  |
Additional disclosures related to mortgages |  |  |  |  |  |
Reference rate used in calculation of Base Rate |  |  | Prime |  |  |
Federal Funds Rate [Member] | Line of Credit |  |  |  |  |  |
Additional disclosures related to mortgages |  |  |  |  |  |
Basis of effective interest rate used in calculation of Base Rate (as a percent) |  |  | 0.50%nen_Nen_DebtInstrumentBasisSpreadOnVariableRateUsedForCalculationOfBaseRate / us-gaap_CreditFacilityAxis = us-gaap_LineOfCreditMember / us-gaap_VariableRateAxis = nen_Nen_FederalFundsRateMember |  |  |
Reference rate used in calculation of Base Rate |  |  | Federal Funds |  |  |
London Interbank Offered Rate (LIBOR) [Member] | Line of Credit |  |  |  |  |  |
Additional disclosures related to mortgages |  |  |  |  |  |
Basis of effective interest rate used in calculation of Base Rate (as a percent) |  |  | 1.00%nen_Nen_DebtInstrumentBasisSpreadOnVariableRateUsedForCalculationOfBaseRate / us-gaap_CreditFacilityAxis = us-gaap_LineOfCreditMember / us-gaap_VariableRateAxis = us-gaap_LondonInterbankOfferedRateLIBORMember |  |  |
Reference rate used in calculation of Base Rate |  |  | one month LIBOR |  |  |
Minimum | Line of Credit |  |  |  |  |  |
Additional disclosures related to mortgages |  |  |  |  |  |
Commitment fee for unused amount (as a percent) |  |  | 0.15%us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage / us-gaap_CreditFacilityAxis = us-gaap_LineOfCreditMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |
Pledged interests rate of the Partnership's ownership interest (as a percent) |  |  | 49.00%nen_Nen_PledgedInterestsRatePercentageOfPartnershipOwnershipInterest / us-gaap_CreditFacilityAxis = us-gaap_LineOfCreditMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |
Minimum | Base Rate [Member] | Line of Credit |  |  |  |  |  |
Additional disclosures related to mortgages |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  | 2.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditFacilityAxis = us-gaap_LineOfCreditMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_VariableRateAxis = us-gaap_BaseRateMember |  |  |
Maximum | Line of Credit |  |  |  |  |  |
Additional disclosures related to mortgages |  |  |  |  |  |
Commitment fee for unused amount (as a percent) |  |  | 0.20%us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage / us-gaap_CreditFacilityAxis = us-gaap_LineOfCreditMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |
Pledged interests rate of the Partnership's ownership interest (as a percent) |  |  | 100.00%nen_Nen_PledgedInterestsRatePercentageOfPartnershipOwnershipInterest / us-gaap_CreditFacilityAxis = us-gaap_LineOfCreditMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |
Maximum | Base Rate [Member] | Line of Credit |  |  |  |  |  |
Additional disclosures related to mortgages |  |  |  |  |  |
Debt Instrument, Basis Spread on Variable Rate |  |  | 3.50%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 / us-gaap_CreditFacilityAxis = us-gaap_LineOfCreditMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_VariableRateAxis = us-gaap_BaseRateMember |  |  |
Mortgages payable |  |  |  |  |  |
MORTGAGE NOTES PAYABLE |  |  |  |  |  |
Amount of monthly installments including principal | 808,000 us-gaap_DebtInstrumentPeriodicPayment / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember |  |  |  |  |
Weighted average interest rate (as a percent) | 4.81%us-gaap_DebtWeightedAverageInterestRate / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember |  |  |  |  |
Effective interest rate (as a percent) | 4.93%us-gaap_DebtInstrumentInterestRateEffectivePercentage / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember |  |  |  |  |
Mortgages payable | NERA Dean Street Associates, LLC |  |  |  |  |  |
MORTGAGE NOTES PAYABLE |  |  |  |  |  |
Interest rate (as a percent) |  |  |  | 4.22%us-gaap_DebtInstrumentInterestRateStatedPercentage / dei_LegalEntityAxis = nen_NERADeanStreetAssociatesLLCMember / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember |  |
Additional disclosures related to mortgages |  |  |  |  |  |
Amount of new loan |  |  |  | 5,687,000 us-gaap_ProceedsFromIssuanceOfDebt / dei_LegalEntityAxis = nen_NERADeanStreetAssociatesLLCMember / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember |  |
Period of interest only payments on loans |  |  |  | 10 years |  |
Amount of loan proceeds utilized for pay off the existing mortgage |  |  |  | 5,077,000 nen_DebtInstrumentLoanProceedsUtilizedToPayOffExistingMortgage / dei_LegalEntityAxis = nen_NERADeanStreetAssociatesLLCMember / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember |  |
Refinancing cost |  |  |  | 89,000 us-gaap_DebtIssuanceCosts / dei_LegalEntityAxis = nen_NERADeanStreetAssociatesLLCMember / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember |  |
Mortgages payable | Hamilton Linewt LLC Commercial-1031Exchange Newton, Massachusetts |  |  |  |  |  |
Additional disclosures related to mortgages |  |  |  |  |  |
Amount of mortgage paid off |  |  |  |  | 1,466,000 us-gaap_RepaymentsOfDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nen_HamiltonLinewtLLCCommercial1031ExchangeNewtonMassachusettsMember |
Mortgages payable | Linhart L.P. Residential/Commercial Newton, Massachusetts |  |  |  |  |  |
Additional disclosures related to mortgages |  |  |  |  |  |
Amount of mortgage paid off |  |  |  |  | 1,926,000 us-gaap_RepaymentsOfDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nen_LinhartLPResidentialCommercialNewtonMassachusettsMember |
Mortgages payable | Courtyard At Westgate Residential Units Burlington Massachusetts Member |  |  |  |  |  |
MORTGAGE NOTES PAYABLE |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  | 4.31%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nen_CourtyardAtWestgateResidentialUnitsBurlingtonMassachusettsMember
Additional disclosures related to mortgages |  |  |  |  |  |
Period of interest only payments on loans |  |  |  |  |  | 10 years
Amount of loan proceeds utilized for pay off the existing mortgage |  |  |  |  |  | 2,010,000 nen_DebtInstrumentLoanProceedsUtilizedToPayOffExistingMortgage / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nen_CourtyardAtWestgateResidentialUnitsBurlingtonMassachusettsMember
Amount of new loan |  |  |  |  |  | 2,500,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nen_CourtyardAtWestgateResidentialUnitsBurlingtonMassachusettsMember
Amount of refinancing costs |  |  |  |  |  | $ 75,000 us-gaap_DebtInstrumentFeeAmount / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nen_CourtyardAtWestgateResidentialUnitsBurlingtonMassachusettsMember
Mortgages payable | Minimum |  |  |  |  |  |
MORTGAGE NOTES PAYABLE |  |  |  |  |  |
Interest rate (as a percent) | 3.76%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember / us-gaap_RangeAxis = us-gaap_MinimumMember |  |  |  |  |
Mortgages payable | Maximum |  |  |  |  |  |
MORTGAGE NOTES PAYABLE |  |  |  |  |  |
Interest rate (as a percent) | 5.97%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_LongtermDebtTypeAxis = us-gaap_MortgagesMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |  |  |

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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400 + Details
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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of the required periodic payments including both interest and principal payments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823 + Details
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- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Amount of debt issuance costs (for example, but not limited to, legal, accounting, broker, and regulatory fees). + References No definition available. + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 22 -Article 5 + Details
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- Definition The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility. + References No definition available. + Details
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- Definition Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 7 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20, 22 -Article 5 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the next rolling twelve months following the latest balance sheet. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-04.(a)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24072-122690 + Details
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- Definition Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the fifth rolling twelve months following the latest balance sheet. For interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-04.(a)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24072-122690 + Details
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