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v2.4.1.9

OTHER ASSETS (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013
OTHER ASSETS |  |
Security deposits | $ 2,090,000 us-gaap_SecurityDeposit | $ 2,053,000 us-gaap_SecurityDeposit
Escrow deposits to fund future capital improvements | 253,000 nen_EscrowDepositToFundCapitalImprovements | 123,000 nen_EscrowDepositToFundCapitalImprovements
Intangible assets in connection with acquisition of Hamilton Green | 49,000 us-gaap_FinitelivedIntangibleAssetsAcquired1 | 978,000 us-gaap_FinitelivedIntangibleAssetsAcquired1
Accumulated amortization on intangible assets in connection with the acquisition of Windsor Green | 1,703,000 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization | 774,000 us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization
Financing fees, net | 1,736,000 nen_FinancingAndLeasingFeesNet | 1,635,000 nen_FinancingAndLeasingFeesNet
Accumulated amortization on financing and leasing fees | $ 613,000 nen_AccumulatedAmortizationOnFinancingAndLeasingFees | $ 548,000 nen_AccumulatedAmortizationOnFinancingAndLeasingFees

X
- Definition Represents the accumulated amortization on financing and leasing fees. + References No definition available. + Details
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- Definition Restricted cash held in escrow to fund future capital improvements. + 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 Represents the financing and leasing fees, net of accumulated amortization. + References No definition available. + Details
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Namespace Prefix: | nen_
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Balance Type: | debit
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- Details
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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 + Details
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Period Type: | instant

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- Definition Amount of increase in assets, excluding financial assets, lacking physical substance with a definite life, resulting from a business combination. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | debit
Period Type: | duration

X
- 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_
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Period Type: | instant