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ADVANCE RENTAL PAYMENTS AND SECURITY DEPOSITS (Details) (USD $) | 6 Months Ended |
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Jun. 30, 2012 | Dec. 31, 2011
ADVANCE RENTAL PAYMENTS AND SECURITY DEPOSITS |  |
Period for advance rental payment | 1 month |
Amount received for prepaid rent | $ 1,405,000 |
Security deposits | $ 1,953,000 | $ 1,879,000

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- Details
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Namespace Prefix: | nen_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the period for which tenant may be required to pay rent in advance. + References No definition available. + Details
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Namespace Prefix: | nen_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents amounts received from tenants for prepaid rents which are included in cash and cash equivalents. + References No definition available. + Details
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Namespace Prefix: | nen_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition The amount of an asset, typically cash, provided to a counterparty to provide certain assurance of performance by the entity pursuant to the terms of a written or oral agreement, such as a lease. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.8,17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Balance Type: | debit
Period Type: | instant