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TREASURY UNITS (Details) (USD $)	0 Months Ended		6 Months Ended		82 Months Ended				1 Months Ended	6 Months Ended		82 Months Ended			6 Months Ended		82 Months Ended	1 Months Ended	6 Months Ended		82 Months Ended	1 Months Ended
	Aug. 08, 2008	Aug. 20, 2007	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Mar. 06, 2008	Jan. 30, 2008	Jan. 15, 2008	Aug. 05, 2014 Subsequent event	Jun. 30, 2014 Class A Treasury Units	Jun. 30, 2013 Class A Treasury Units	Jun. 30, 2014 Class A Treasury Units	Jan. 03, 2012 Class A Treasury Units	Aug. 20, 2007 Class A Treasury Units	Jun. 30, 2014 Class B Treasury Units	Jun. 30, 2013 Class B Treasury Units	Jun. 30, 2014 Class B Treasury Units	Aug. 05, 2014 Class B Treasury Units Subsequent event	Jun. 30, 2014 General Partnership	Jun. 30, 2013 General Partnership	Jun. 30, 2014 General Partnership	Aug. 05, 2014 General Partnership Subsequent event
Treasury units			51,402		51,402					41,122		41,122			9,766		9,766		514		514
Period for repurchase of depository receipts	12 months	12 months
Depository receipts authorized to be repurchased		300,000				1,500,000	900,000	600,000
Number of units in each depository receipt													0.03333	0.1
Fixed distribution percentage of unit holders										80.00%					19.00%				1.00%
Repurchase of depository receipts			15,931		1,258,822				5,049								2,229
Repurchase price of depository receipts			$ 46.26		$ 25.13				$ 48.81
Repurchase price of units			$ 1,387.80						$ 1,464.30			$ 753.90					$ 700.12				$ 700.12
Repurchase of units			664	404											126			40.0	7		117	2.1
Total cost of repurchase			$ 941,477	$ 399,487	$ 33,422,000					$ 757,246	$ 321,240				$ 175,019	$ 74,335		$ 58,532	$ 9,212	$ 3,912		$ 3,081
Repurchase of depository receipts			$ 757,246						$ 253,274

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 number of depository receipts repurchased under the equity repurchase program.

+ References

No definition available.

+ Details

Name:	nen_PartnersCapitalAccountDepositoryReceiptsTreasury
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

Name:	nen_PartnersCapitalAccountDepositoryReceiptsTreasuryAverageRepurchasePricePerDepositoryReceipt
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

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

X

- Definition

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

+ References

No definition available.

+ Details

Name:	nen_PartnersCapitalAccountDepositoryReceiptsTreasuryRepurchased
Namespace Prefix:	nen_
Data Type:	xbrli:monetaryItemType
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

Name:	nen_PartnersCapitalAccountFixedDistributionPercentageOfHoldersOfUnits
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

Name:	nen_PartnersCapitalAccountPeriodForRepurchaseOfDepositoryReceipts
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

Name:	nen_PartnersCapitalAccountTreasuryUnitsIssued
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

Name:	nen_PartnersCapitalAccountUnitsTreasuryAverageRepurchasePricePerUnit
Namespace Prefix:	nen_
Data Type:	num:perShareItemType
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

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration