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SIGNIFICANT ACCOUNTING POLICIES (Details) | Jun. 30, 2014 item
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Residential and mixed-use properties |
Line of Business |
Number of properties | 20
Number of units | 2,412
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 | 2,412
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) | 108,043
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 | 793
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_
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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 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
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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
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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