XML 34 R45.htm IDEA: XBRL DOCUMENT
v2.4.0.6

TAXABLE INCOME AND TAX BASIS (Details) (USD $) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 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
Name: | nen_IncomeTaxChangeInPercentageOfAllowableAcceleratedDepreciationDeductions
Namespace Prefix: | nen_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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
Name: | nen_IncomeTaxExcessOfInvestmentsStatementBasisOverInvestmentsTaxableBasis
Namespace Prefix: | nen_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Represents the cumulative basis amount by which taxable income basis is less than statement income basis. + References No definition available. + Details
Name: | nen_IncomeTaxExcessOfRealEstateStatementBasisOverRealEstateIncomeTaxBasis
Namespace Prefix: | nen_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Represents the amount by which taxable income is less than statement income. + References No definition available. + Details
Name: | nen_IncomeTaxExcessOfStatementIncomeOverTaxableIncome
Namespace Prefix: | nen_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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