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TREASURY UNITS (Details) - 10Q (USD $)	0 Months Ended			3 Months Ended		91 Months Ended
	Mar. 10, 2015	Aug. 08, 2008	Aug. 20, 2007	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2015	Mar. 06, 2008	Jan. 30, 2008	Jan. 15, 2008	Jan. 03, 2012
Treasury units				53,381nen_PartnersCapitalAccountTreasuryUnitsIssued		53,381nen_PartnersCapitalAccountTreasuryUnitsIssued
Period for repurchase of depository receipts	5 years	12 months	12 months
Depository receipts authorized to be repurchased	2,000,000nen_PartnersCapitalAccountDepositoryReceiptsTreasuryReceiptsAuthorizedToBeRepurchased		300,000nen_PartnersCapitalAccountDepositoryReceiptsTreasuryReceiptsAuthorizedToBeRepurchased				1,500,000nen_PartnersCapitalAccountDepositoryReceiptsTreasuryReceiptsAuthorizedToBeRepurchased	900,000nen_PartnersCapitalAccountDepositoryReceiptsTreasuryReceiptsAuthorizedToBeRepurchased	600,000nen_PartnersCapitalAccountDepositoryReceiptsTreasuryReceiptsAuthorizedToBeRepurchased
Repurchase of depository receipts				19,415nen_PartnersCapitalAccountDepositoryReceiptsTreasury		1,306,331nen_PartnersCapitalAccountDepositoryReceiptsTreasury
Repurchase price of depository receipts				$ 50.00nen_PartnersCapitalAccountDepositoryReceiptsTreasuryAverageRepurchasePricePerDepositoryReceipt		$ 26.01nen_PartnersCapitalAccountDepositoryReceiptsTreasuryAverageRepurchasePricePerDepositoryReceipt
Repurchase price of units				$ 1,500.00nen_PartnersCapitalAccountUnitsTreasuryAverageRepurchasePricePerUnit
Repurchase of units				809us-gaap_PartnersCapitalAccountUnitsTreasury	271us-gaap_PartnersCapitalAccountUnitsTreasury
Total cost of repurchase				$ 1,218,440us-gaap_PartnersCapitalAccountTreasuryUnitsPurchases	$ 379,409us-gaap_PartnersCapitalAccountTreasuryUnitsPurchases	$ 36,385,000us-gaap_PartnersCapitalAccountTreasuryUnitsPurchases
Repurchase of depository receipts				975,731nen_PartnersCapitalAccountDepositoryReceiptsTreasuryRepurchased
Class A
Treasury units				42,704nen_PartnersCapitalAccountTreasuryUnitsIssued / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = nen_LimitedClassAMember		42,704nen_PartnersCapitalAccountTreasuryUnitsIssued / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = nen_LimitedClassAMember
Number of units in each depository receipt			0.1dei_EntityListingDepositoryReceiptRatio / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = nen_LimitedClassAMember							0.03333dei_EntityListingDepositoryReceiptRatio / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = nen_LimitedClassAMember
Fixed distribution percentage of unit holders				80.00%nen_PartnersCapitalAccountFixedDistributionPercentageOfHoldersOfUnits / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = nen_LimitedClassAMember
Repurchase price of units						$ 780.30nen_PartnersCapitalAccountUnitsTreasuryAverageRepurchasePricePerUnit / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = nen_LimitedClassAMember
Total cost of repurchase				975,731us-gaap_PartnersCapitalAccountTreasuryUnitsPurchases / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = nen_LimitedClassAMember	305,230us-gaap_PartnersCapitalAccountTreasuryUnitsPurchases / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = nen_LimitedClassAMember
Class B
Treasury units				10,143nen_PartnersCapitalAccountTreasuryUnitsIssued / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = nen_LimitedClassBMember		10,143nen_PartnersCapitalAccountTreasuryUnitsIssued / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = nen_LimitedClassBMember
Fixed distribution percentage of unit holders				19.00%nen_PartnersCapitalAccountFixedDistributionPercentageOfHoldersOfUnits / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = nen_LimitedClassBMember
Repurchase of depository receipts						2,605nen_PartnersCapitalAccountDepositoryReceiptsTreasury / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = nen_LimitedClassBMember
Repurchase price of units						$ 812.50nen_PartnersCapitalAccountUnitsTreasuryAverageRepurchasePricePerUnit / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = nen_LimitedClassBMember
Repurchase of units				154us-gaap_PartnersCapitalAccountUnitsTreasury / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = nen_LimitedClassBMember
Total cost of repurchase				230,574us-gaap_PartnersCapitalAccountTreasuryUnitsPurchases / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = nen_LimitedClassBMember	70,470us-gaap_PartnersCapitalAccountTreasuryUnitsPurchases / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = nen_LimitedClassBMember
General Partnership
Treasury units				534nen_PartnersCapitalAccountTreasuryUnitsIssued / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = us-gaap_GeneralPartnerMember		534nen_PartnersCapitalAccountTreasuryUnitsIssued / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = us-gaap_GeneralPartnerMember
Fixed distribution percentage of unit holders				1.00%nen_PartnersCapitalAccountFixedDistributionPercentageOfHoldersOfUnits / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = us-gaap_GeneralPartnerMember
Repurchase of depository receipts						137nen_PartnersCapitalAccountDepositoryReceiptsTreasury / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = us-gaap_GeneralPartnerMember
Repurchase of units				8us-gaap_PartnersCapitalAccountUnitsTreasury / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = us-gaap_GeneralPartnerMember
Total cost of repurchase				$ 12,135us-gaap_PartnersCapitalAccountTreasuryUnitsPurchases / us-gaap_PartnerTypeOfPartnersCapitalAccountAxis = us-gaap_GeneralPartnerMember	$ 3,709us-gaap_PartnersCapitalAccountTreasuryUnitsPurchases / 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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Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Represents the number of depository receipts repurchased under the equity repurchase program.

+ References

No definition available.

+ Details

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Namespace Prefix:	nen_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the average price at which depository receipts are repurchased under the equity repurchase program.

+ References

No definition available.

+ Details

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Namespace Prefix:	nen_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the number of depository receipts authorized to be repurchased under the equity repurchase program.

+ References

No definition available.

+ Details

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Namespace Prefix:	nen_
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X

- Definition

Represents the amount of depository receipts repurchased under the equity repurchase program.

+ References

No definition available.

+ Details

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Namespace Prefix:	nen_
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Balance Type:	debit
Period Type:	duration

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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Namespace Prefix:	nen_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the period over which the entity is permitted to purchase its depository receipts.

+ References

No definition available.

+ Details

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Namespace Prefix:	nen_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the number of treasury units outstanding as on the balance sheet date.

+ References

No definition available.

+ Details

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Namespace Prefix:	nen_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Represents the average price at which units are repurchased under the equity repurchase program.

+ References

No definition available.

+ Details

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Namespace Prefix:	nen_
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Balance Type:	na
Period Type:	duration

X

- Definition

Value of units that were previously issued and have been repurchased during the year.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 272

-SubTopic 10

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6828210&loc=d3e70191-108054

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Units that were previously issued and have been repurchased during the year.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section S99

-Paragraph 5

-Subparagraph (SAB TOPIC 4.F)

-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187171-122770

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- Details

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