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TREASURY UNITS (Details) - 10Q (USD $)	0 Months Ended		9 Months Ended		85 Months Ended					1 Months Ended	2 Months Ended	9 Months Ended		85 Months Ended			9 Months Ended		85 Months Ended	1 Months Ended	2 Months Ended	9 Months Ended		85 Months Ended	1 Months Ended	2 Months Ended
	Aug. 08, 2008	Aug. 20, 2007	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Mar. 06, 2008	Jan. 30, 2008	Jan. 15, 2008	Aug. 20, 2007	Nov. 04, 2014 Subsequent event	Nov. 30, 2014 Subsequent event	Sep. 30, 2014 Class A	Sep. 30, 2013 Class A	Sep. 30, 2014 Class A	Jan. 03, 2012 Class A	Aug. 20, 2007 Class A	Sep. 30, 2014 Class B	Sep. 30, 2013 Class B	Sep. 30, 2014 Class B	Nov. 04, 2014 Class B Subsequent event	Nov. 30, 2014 Class B Subsequent event	Sep. 30, 2014 General Partnership	Sep. 30, 2013 General Partnership	Sep. 30, 2014 General Partnership	Nov. 04, 2014 General Partnership Subsequent event	Nov. 30, 2014 General Partnership Subsequent event
Treasury units			51,818		51,818							41,455		41,455			9,845		9,845			518		518
Period for repurchase of depository receipts	12 months	12 months
Depository receipts authorized to be repurchased						1,500,000	900,000	600,000	300,000
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			25,920		1,268,811					5,277	5,277								2,308					122
Repurchase price of depository receipts			$ 47.22		$ 25.32					$ 47.37	$ 47.37
Repurchase price of units			$ 1,416.60							$ 1,421.10	$ 1,421.10			$ 759.60					$ 726.25
Repurchase of units			1,080	905													205			41.8	41.8	11			2.2	2.2
Total cost of repurchase			$ 1,564,397	$ 1,021,987	$ 34,045,000							$ 1,258,399	$ 819,240				$ 290,698	$ 192,610		$ 59,369		$ 15,300	$ 10,137		$ 3,125
Repurchase of depository receipts			$ 1,258,399							$ 257,098	$ 257,098

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

Name:	us-gaap_PartnersCapitalAccountTreasuryUnitsPurchases
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