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PARTNERS' CAPITAL (Details) - 10Q (USD $)	3 Months Ended		0 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Jan. 03, 2012	Dec. 31, 2014	Aug. 20, 2007
Quarterly distribution per unit (in dollars per unit)				7.50nen_PartnersCapitalAccountQuarterlyDistributionPerUnitOfLimitedPartnerInterest
Quarterly distributions per depositary receipt (in dollars per share)				$ 0.25nen_PartnersCapitalAccountQuarterlyDistributionPerDepositoryReceipt
Distribution per unit (in dollars per unit)				$ 30.00us-gaap_PartnersCapitalAccountDistributionPerUnitOfLimitedPartnerInterest
Earnings per depository receipt
Net Income per Depositary Receipt after Discontinued Operations	0.11nen_NetIncomeLossPerOutstandingDepositoryReceipt	(0.01)nen_NetIncomeLossPerOutstandingDepositoryReceipt
Distributions per Depositary Receipt (in dollars per share)	0.25nen_PartnersCapitalAccountDistributionPerDepositoryReceipt	0.25nen_PartnersCapitalAccountDistributionPerDepositoryReceipt		1.00nen_PartnersCapitalAccountDistributionPerDepositoryReceipt
Limited Partner
Number of classes of partners	2nen_PartnersCapitalAccountNumberOfClassesOfPartners / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = us-gaap_LimitedPartnerMember
Class A
Fixed distribution percentage of unit holders	80.00%nen_PartnersCapitalAccountFixedDistributionPercentageOfHoldersOfUnits / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = nen_LimitedClassAMember
Forward split of depositary receipts			3nen_DepositaryReceiptForwardSplitConversionRatio / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = nen_LimitedClassAMember
Exchange ratio of depositary receipts for partnership units before adjustment			10nen_DepositaryReceiptExchangeRatioOfDepositaryReceiptsForPartnershipUnitsBeforeAdjustment / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = nen_LimitedClassAMember
Exchange ratio of depositary receipts for partnership units after adjustment			30nen_DepositaryReceiptExchangeRatioOfDepositaryReceiptsForPartnershipUnitsAfterAdjustment / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = nen_LimitedClassAMember
Number of units in each depository receipt			0.03333dei_EntityListingDepositoryReceiptRatio / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = nen_LimitedClassAMember		0.1dei_EntityListingDepositoryReceiptRatio / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = nen_LimitedClassAMember
Quarterly distribution per unit approved (in dollars per unit)	7.50nen_PartnersCapitalAccountQuarterlyDistributionPerUnitOfLimitedPartnerInterestApproved / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = nen_LimitedClassAMember
Quarterly distributions per depositary receipt (in dollars per share)	$ 0.25nen_PartnersCapitalAccountQuarterlyDistributionPerDepositoryReceipt / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = nen_LimitedClassAMember
Class B
Fixed distribution percentage of unit holders	19.00%nen_PartnersCapitalAccountFixedDistributionPercentageOfHoldersOfUnits / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = nen_LimitedClassBMember
General Partnership
Number of classes of partners	1nen_PartnersCapitalAccountNumberOfClassesOfPartners / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = us-gaap_GeneralPartnerMember
Fixed distribution percentage of unit holders	1.00%nen_PartnersCapitalAccountFixedDistributionPercentageOfHoldersOfUnits / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = us-gaap_GeneralPartnerMember

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

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X

- Definition

Represents the exchange ratio of depositary receipts for specified partnership units after adjustment.

+ References

No definition available.

+ Details

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X

- Definition

Represents the exchange ratio of depositary receipts for specified partnership units before adjustment.

+ References

No definition available.

+ Details

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X

- Definition

Represents the forward split of depositary receipts listed on the NYSE Amex as authorized by the entity.

+ References

No definition available.

+ Details

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X

- Details

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Balance Type:	na
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X

- Definition

Represents the net income (loss) allocated to each outstanding depository receipt.

+ References

No definition available.

+ Details

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X

- Definition

Represents the distributions per depository receipt.

+ References

No definition available.

+ Details

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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

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X

- Definition

Represents the number of classes of limited partners.

+ References

No definition available.

+ Details

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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

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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

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Namespace Prefix:	nen_
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X

- Definition

Represents the amount of quarterly distribution per unit of limited partner interest approved by the Board of Advisors.

+ References

No definition available.

+ Details

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Namespace Prefix:	nen_
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X

- Definition

The amount of the distribution per unit of limited partner interest.

+ References

Reference 1: 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=27012166&loc=d3e187171-122770



Reference 2: 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

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- Details

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