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SIGNIFICANT ACCOUNTING POLICIES (Details) | Mar. 31, 2013 item
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Residential and mixed-use properties |
Line of Business |
Number of properties | 20
Number of units | 2,251
Condominium |
Line of Business |
Number of units | 19
Wholly owned properties |
Line of Business |
Number of properties | 24
Wholly owned properties | Residential buildings |
Line of Business |
Number of properties | 16
Number of units | 2,251
Wholly owned properties | Mixed use residential, retail and office buildings |
Line of Business |
Number of properties | 4
Wholly owned properties | Commercial |
Line of Business |
Number of properties | 3
Area of property (in square feet) | 110,949
Wholly owned properties | Condominium |
Line of Business |
Number of properties | 1
Number of units | 19
Partially owned properties | Residential and mixed-use properties |
Line of Business |
Number of properties | 9
Number of units | 798
Area of property (in square feet) | 12,500
Partially owned properties | Residential and mixed-use properties | Minimum |
Line of Business |
Percentage of ownership interest | 40.00%
Partially owned properties | Residential and mixed-use properties | Maximum |
Line of Business |
Percentage of ownership interest | 50.00%
Partially owned properties | Car parking lot |
Line of Business |
Capacity of real estate property (in cars per lot) | 50

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

X
- 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 Statement of Financial Accounting Standard (FAS) -Number 159 -Paragraph 18 -Subparagraph f -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: 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 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 18 -Paragraph 20 -Subparagraph a (1) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + 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
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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

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