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SIGNIFICANT ACCOUNTING POLICIES (Details)	Dec. 31, 2013 item
Residential and mixed-use properties
Line of Business
Number of properties	20
Number of units	2,412
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	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 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

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

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