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OTHER ASSETS (Details) (USD $) | Dec. 31, 2012 | Dec. 31, 2011
--- | --- | ---
OTHER ASSETS |  |
Security deposits | $ 1,919,000 | $ 1,879,000
Escrow deposits to fund future capital improvements | 420,000 | 1,014,000
Financing fees, net | 1,136,000 | 919,000
Accumulated amortization on financing and leasing fees | $ 772,000 | $ 636,000

X
- Definition Represents the accumulated amortization on financing and leasing fees. + References No definition available. + Details
Name: | nen_AccumulatedAmortizationOnFinancingAndLeasingFees
Namespace Prefix: | nen_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Restricted cash held in escrow to fund future capital improvements. + References No definition available. + Details
Name: | nen_EscrowDepositToFundCapitalImprovements
Namespace Prefix: | nen_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represents the financing and leasing fees, net of accumulated amortization. + References No definition available. + Details
Name: | nen_FinancingAndLeasingFeesNet
Namespace Prefix: | nen_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

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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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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant