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TAXABLE INCOME AND TAX BASIS (Details) (USD $) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2012 | Dec. 31, 2011
TAXABLE INCOME AND TAX BASIS |  |
Excess amount of statement income over taxable income |  | $ 8,856,000
Excess amount of cumulative statement basis over cumulative taxable basis |  | 12,000,000
Excess amount of statement income from joint venture investments over taxable income | $ 2,000,000 |
Reduction in percentage of allowable deduction of accelerated depreciation | 50.00% |

X
- Definition Represents the percentage reduction in allowable deduction for accelerated depreciation. + References No definition available. + Details
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X
- Definition Represents the amount by which taxable income basis is less than statement income basis due to accelerated depreciation. + References No definition available. + Details
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Namespace Prefix: | nen_
Data Type: | xbrli:monetaryItemType
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X
- Definition Represents the cumulative basis amount by which taxable income basis is less than statement income basis. + References No definition available. + Details
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- Definition Represents the amount by which taxable income is less than statement income. + References No definition available. + Details
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Namespace Prefix: | nen_
Data Type: | xbrli:monetaryItemType
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- Details
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