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SIGNIFICANT ACCOUNTING POLICIES (Details)
Dec. 31, 2014
Dec. 31, 2013
Residential and mixed-use properties    
Line of Business    
Number of properties 20us-gaap_NumberOfRealEstateProperties
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= nen_ResidentialAndMixedUseRealEstateMember		  
Number of units 2,412us-gaap_NumberOfUnitsInRealEstateProperty
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= nen_ResidentialAndMixedUseRealEstateMember		  
Wholly owned properties    
Line of Business    
Number of properties 24us-gaap_NumberOfRealEstateProperties
/ us-gaap_RealEstatePropertiesAxis
= us-gaap_WhollyOwnedPropertiesMember		  
Wholly owned properties | Residential buildings    
Line of Business    
Number of properties 16us-gaap_NumberOfRealEstateProperties
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_ResidentialRealEstateMember
/ us-gaap_RealEstatePropertiesAxis
= us-gaap_WhollyOwnedPropertiesMember		  
Number of units 2,412us-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 4us-gaap_NumberOfRealEstateProperties
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= nen_ResidentialRetailAndOfficeBuildingMixedUseMember
/ us-gaap_RealEstatePropertiesAxis
= us-gaap_WhollyOwnedPropertiesMember		  
Wholly owned properties | Commercial    
Line of Business    
Number of properties 3us-gaap_NumberOfRealEstateProperties
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_RealEstatePropertiesAxis
= us-gaap_WhollyOwnedPropertiesMember		  
Area of property (in square feet) 108,043us-gaap_AreaOfRealEstateProperty
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= us-gaap_CommercialRealEstateMember
/ us-gaap_RealEstatePropertiesAxis
= us-gaap_WhollyOwnedPropertiesMember		  
Wholly owned properties | Condominium    
Line of Business    
Number of properties 1us-gaap_NumberOfRealEstateProperties
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= nen_CondominiumRealEstateMember
/ us-gaap_RealEstatePropertiesAxis
= us-gaap_WhollyOwnedPropertiesMember		  
Number of units 19us-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 9us-gaap_NumberOfRealEstateProperties
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= nen_ResidentialAndMixedUseRealEstateMember
/ us-gaap_RealEstatePropertiesAxis
= us-gaap_PartiallyOwnedPropertiesMember		  
Number of units 790us-gaap_NumberOfUnitsInRealEstateProperty
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= nen_ResidentialAndMixedUseRealEstateMember
/ us-gaap_RealEstatePropertiesAxis
= us-gaap_PartiallyOwnedPropertiesMember		  
Area of property (in square feet) 12,500us-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		 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) 50nen_CapacityOfRealEstateProperty
/ us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis
= nen_CarParkingLotRealEstateMember
/ us-gaap_RealEstatePropertiesAxis
= us-gaap_PartiallyOwnedPropertiesMember