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ADVANCE RENTAL PAYMENTS AND SECURITY DEPOSITS (Details) (USD $) | 12 Months Ended
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Dec. 31, 2012
ADVANCE RENTAL PAYMENTS AND SECURITY DEPOSITS |
Period for advance rental payment | 1 month
Amount received for prepaid rent | $ 1,339,000
Security deposits | $ 1,919,000

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- Details
Name: | nen_AdvanceRentalPaymentsAndSecurityDepositsDisclosureAbstract
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
Name: | nen_PeriodForWhichRentToBePaidInAdvanceByTenant
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
Name: | nen_PrepaidRentReceivedIncludedInCashAndCashEquivalents
Namespace Prefix: | nen_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Amount of security deposits included in other assets and are classified as restricted cash. + References No definition available. + Details
Name: | nen_SecurityDepositIncludedInRestrictedCash
Namespace Prefix: | nen_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant