XML 32 R40.htm IDEA: XBRL DOCUMENT
v2.4.0.6

PARTNERS' CAPITAL (Details) (USD $) | 1 Months Ended | 6 Months Ended |  |  |  |  |  | 6 Months Ended | 1 Months Ended | 6 Months Ended |  |  | 6 Months Ended
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 31, 2012 | Jun. 30, 2012 USDPerUnit | Jun. 30, 2011 USDPerUnit | Sep. 30, 2012 USDPerUnit | Mar. 31, 2012 USDPerUnit | Dec. 31, 2011 USDPerUnit | Sep. 30, 2011 USDPerUnit | Mar. 31, 2011 USDPerUnit | Jun. 30, 2012 Limited Partner item | Jan. 31, 2012 Class A | Jun. 30, 2012 Class A USDPerUnit | Jan. 17, 2012 Class A USDPerUnit | Jan. 03, 2012 Class A | Jun. 30, 2012 Class B | Jun. 30, 2012 General Partnership item
Number of classes of partners |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  | 1
Fixed distribution percentage of unit holders |  |  |  |  |  |  |  |  |  |  | 80.00% |  |  | 19.00% | 1.00%
Forward split of depositary receipts | 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exchange ratio of depositary receipts for partnership units before adjustment |  |  |  |  |  |  |  |  |  | 10 |  |  |  |  |
Exchange ratio of depositary receipts for partnership units after adjustment |  |  |  |  |  |  |  |  |  | 30 |  |  |  |  |
Number of units in each depository receipt |  |  |  |  |  |  |  |  |  |  |  |  | 0.03333 |  |
Quarterly distribution per unit (in dollars per unit) |  | 7.50 | 7.00 | 7.5 | 7.5 | 7.00 | 7.00 | 7.00 |  |  | 7.50 | 7 |  |  |
Quarterly distributions per depositary receipt (in dollars per share) |  | $ 0.25 | $ 0.23 | $ 0.25 | $ 0.25 | $ 0.23 | $ 0.23 | $ 0.23 |  |  |  |  |  |  |
Distribution per unit (in dollars per unit) |  |  |  |  |  | $ 28.00 |  |  |  |  |  |  |  |  |
Earnings per depository receipt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income per Depositary Receipt before Discontinued Operations (in dollars per share) |  | $ 0.42 | $ 0.12 |  |  |  |  |  |  |  |  |  |  |  |
Income from Discontinued Operations (in dollars per share) |  |  | $ 1.98 |  |  |  |  |  |  |  |  |  |  |  |
Net Income per Depositary Receipt after Discontinued Operations (in dollars per share) |  | $ 0.42 | $ 2.10 |  |  |  |  |  |  |  |  |  |  |  |
Distributions per Depositary Receipt (in dollars per share) |  | $ 0.50 | $ 0.46 |  |  | $ 0.93 |  |  |  |  |  |  |  |  |

X
- Definition The number of underlying shares represented by one American Depository Receipt (ADR) or Global Depository Receipt (GDR). A value of "3" means that one ADR represents 3 underlying shares. If one underlying share represents 2 ADR's then the value would be represented as "0.5". + References No definition available. + Details
Name: | dei_EntityListingDepositoryReceiptRatio
Namespace Prefix: | dei_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the exchange ratio of depositary receipts for specified partnership units after adjustment. + References No definition available. + Details
Name: | nen_DepositaryReceiptExchangeRatioOfDepositaryReceiptsForPartnershipUnitsAfterAdjustment
Namespace Prefix: | nen_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the exchange ratio of depositary receipts for specified partnership units before adjustment. + References No definition available. + Details
Name: | nen_DepositaryReceiptExchangeRatioOfDepositaryReceiptsForPartnershipUnitsBeforeAdjustment
Namespace Prefix: | nen_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the forward split of depositary receipts listed on the NYSE Amex as authorized by the entity. + References No definition available. + Details
Name: | nen_DepositaryReceiptForwardSplitConversionRatio
Namespace Prefix: | nen_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | nen_EarningsPerDepositoryReceiptAbstract
Namespace Prefix: | nen_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the amount of income or loss from continuing operations available to each depository receipt during the reporting period. + References No definition available. + Details
Name: | nen_IncomeLossFromContinuingOperationsPerOutstandingDepositoryReceipt
Namespace Prefix: | nen_
Data Type: | us-types:perUnitItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the amount of income (loss) from disposition of discontinued operations available to each depository receipt during the reporting period, net of tax. + References No definition available. + Details
Name: | nen_IncomeLossFromDiscontinuedOperationsNetOfTaxPerOutstandingDepositoryReceipt
Namespace Prefix: | nen_
Data Type: | us-types:perUnitItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the net income (loss) allocated to each outstanding depository receipt. + References No definition available. + Details
Name: | nen_NetIncomeLossPerOutstandingDepositoryReceipt
Namespace Prefix: | nen_
Data Type: | us-types:perUnitItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the distributions per depository receipt. + References No definition available. + Details
Name: | nen_PartnersCapitalAccountDistributionPerDepositoryReceipt
Namespace Prefix: | nen_
Data Type: | us-types:perUnitItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the fixed distribution percentages of the holders of units based on which the entity is required to purchase the proportionate number of specific units with every purchase of depository receipts. + References No definition available. + Details
Name: | nen_PartnersCapitalAccountFixedDistributionPercentageOfHoldersOfUnits
Namespace Prefix: | nen_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the number of classes of partners. + References No definition available. + Details
Name: | nen_PartnersCapitalAccountNumberOfClassesOfPartners
Namespace Prefix: | nen_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the quarterly distributions per depository receipt. + References No definition available. + Details
Name: | nen_PartnersCapitalAccountQuarterlyDistributionPerDepositoryReceipt
Namespace Prefix: | nen_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the amount of quarterly distribution per unit of limited partner interest. + References No definition available. + Details
Name: | nen_PartnersCapitalAccountQuarterlyDistributionPerUnitOfLimitedPartnerInterest
Namespace Prefix: | nen_
Data Type: | us-types:perUnitItemType
Balance Type: | na
Period Type: | instant

X
- Definition The amount of the distribution per unit of limited partner interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 16 -Subparagraph a, b -Article 6 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187171-122770 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 87-21 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Practice Bulletin (PB) -Number 14 -Paragraph 15 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
Name: | us-gaap_PartnersCapitalAccountDistributionPerUnitOfLimitedPartnerInterest
Namespace Prefix: | us-gaap_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | instant