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SIGNIFICANT ACCOUNTING POLICIES (Details) - 10Q | Mar. 31, 2015 item
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Residential and mixed-use properties |
Line of Business |
Number of properties | 20 us-gaap_NumberOfRealEstateProperties / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = nen_ResidentialAndMixedUseRealEstateMember
Number of units | 2,412 us-gaap_NumberOfUnitsInRealEstateProperty / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = nen_ResidentialAndMixedUseRealEstateMember
Condominium |
Line of Business |
Number of units | 19 us-gaap_NumberOfUnitsInRealEstateProperty / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = nen_CondominiumRealEstateMember
Wholly owned properties |
Line of Business |
Number of properties | 24 us-gaap_NumberOfRealEstateProperties / us-gaap_RealEstatePropertiesAxis = us-gaap_WhollyOwnedPropertiesMember
Wholly owned properties | Residential buildings |
Line of Business |
Number of properties | 16 us-gaap_NumberOfRealEstateProperties / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_ResidentialRealEstateMember / us-gaap_RealEstatePropertiesAxis = us-gaap_WhollyOwnedPropertiesMember
Number of units | 2,412 us-gaap_NumberOfUnitsInRealEstateProperty / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_ResidentialRealEstateMember / us-gaap_RealEstatePropertiesAxis = us-gaap_WhollyOwnedPropertiesMember
Wholly owned properties | Mixed use residential, retail and office buildings |
Line of Business |
Number of properties | 4 us-gaap_NumberOfRealEstateProperties / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = nen_ResidentialRetailAndOfficeBuildingMixedUseMember / us-gaap_RealEstatePropertiesAxis = us-gaap_WhollyOwnedPropertiesMember
Wholly owned properties | Commercial |
Line of Business |
Number of properties | 3 us-gaap_NumberOfRealEstateProperties / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_CommercialRealEstateMember / us-gaap_RealEstatePropertiesAxis = us-gaap_WhollyOwnedPropertiesMember
Area of property (in square feet) | 108,043 us-gaap_AreaOfRealEstateProperty / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = us-gaap_CommercialRealEstateMember / us-gaap_RealEstatePropertiesAxis = us-gaap_WhollyOwnedPropertiesMember
Wholly owned properties | Condominium |
Line of Business |
Number of properties | 1 us-gaap_NumberOfRealEstateProperties / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = nen_CondominiumRealEstateMember / us-gaap_RealEstatePropertiesAxis = us-gaap_WhollyOwnedPropertiesMember
Number of units | 19 us-gaap_NumberOfUnitsInRealEstateProperty / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = nen_CondominiumRealEstateMember / us-gaap_RealEstatePropertiesAxis = us-gaap_WhollyOwnedPropertiesMember
Partially owned properties | Residential and mixed-use properties |
Line of Business |
Number of properties | 9 us-gaap_NumberOfRealEstateProperties / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = nen_ResidentialAndMixedUseRealEstateMember / us-gaap_RealEstatePropertiesAxis = us-gaap_PartiallyOwnedPropertiesMember
Number of units | 790 us-gaap_NumberOfUnitsInRealEstateProperty / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = nen_ResidentialAndMixedUseRealEstateMember / us-gaap_RealEstatePropertiesAxis = us-gaap_PartiallyOwnedPropertiesMember
Area of property (in square feet) | 12,500 us-gaap_AreaOfRealEstateProperty / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = nen_ResidentialAndMixedUseRealEstateMember / us-gaap_RealEstatePropertiesAxis = us-gaap_PartiallyOwnedPropertiesMember
Partially owned properties | Residential and mixed-use properties | Minimum |
Line of Business |
Percentage of ownership interest | 40.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = nen_ResidentialAndMixedUseRealEstateMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_RealEstatePropertiesAxis = us-gaap_PartiallyOwnedPropertiesMember
Partially owned properties | Residential and mixed-use properties | Maximum |
Line of Business |
Percentage of ownership interest | 50.00%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = nen_ResidentialAndMixedUseRealEstateMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_RealEstatePropertiesAxis = us-gaap_PartiallyOwnedPropertiesMember
Partially owned properties | Car parking lot |
Line of Business |
Capacity of real estate property (in cars per lot) | 50 nen_CapacityOfRealEstateProperty / us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis = nen_CarParkingLotRealEstateMember / us-gaap_RealEstatePropertiesAxis = us-gaap_PartiallyOwnedPropertiesMember

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- Definition Represents the capacity of real estate property. + References No definition available. + Details
Name: | nen_CapacityOfRealEstateProperty
Namespace Prefix: | nen_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Area of a real estate property. + References No definition available. + Details
Name: | us-gaap_AreaOfRealEstateProperty
Namespace Prefix: | us-gaap_
Data Type: | num:areaItemType
Balance Type: | na
Period Type: | instant

X
- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571 + Details
Name: | us-gaap_EquityMethodInvestmentOwnershipPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The number of real estate properties owned as of the balance sheet date. + References No definition available. + Details
Name: | us-gaap_NumberOfRealEstateProperties
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition The number of units in a real estate property owned as of the balance sheet date. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | us-gaap_RealEstatePropertiesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=nen_ResidentialAndMixedUseRealEstateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RealEstatePropertiesAxis=us-gaap_PartiallyOwnedPropertiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_RealEstatePropertiesAxis=us-gaap_WhollyOwnedPropertiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |