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TREASURY UNITS (Details) (USD $)	9 Months Ended	61 Months Ended		1 Months Ended	9 Months Ended		61 Months Ended	1 Months Ended	9 Months Ended	61 Months Ended	1 Months Ended
	Sep. 30, 2012	Sep. 30, 2012	Aug. 20, 2007	Nov. 09, 2012 Subsequent event	Sep. 30, 2012 Class A Treasury Units	Sep. 30, 2012 Class B Treasury Units	Sep. 30, 2012 Class B Treasury Units	Nov. 09, 2012 Class B Treasury Units Subsequent event	Sep. 30, 2012 General Partnership	Sep. 30, 2012 General Partnership	Nov. 09, 2012 General Partnership Subsequent event
Treasury units (in shares)	49,449	49,449			39,559	9,395	9,395		495	495
Depository receipts authorized to be repurchased (in shares)			1,500,000
Fixed distribution percentage of unit holders					80.00%	19.00%			1.00%
Repurchase of depository receipts (in shares)	16,985	1,211,945		942		135	1,859		7	98
Repurchase of depository receipts	$ 488,627
Repurchase price of depository receipts (in dollars per share)		$ 24.59		$ 28.85
Repurchase price of units (in dollars per share)				$ 865.50			$ 604.92			$ 604.92
Repurchase of units	$ 610,294	$ 31,150,000		$ 28,344	$ 488,627	$ 115,584		$ 6,454	$ 6,083		$ 340
Repurchase of units (in shares)	(708)							7.5			0.39

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_
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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_
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

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Namespace Prefix:	nen_
Data Type:	num:percentItemType
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_
Data Type:	num:perShareItemType
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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



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Practice Bulletin (PB)

-Number 14

-Paragraph 8

-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.

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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=6959260&loc=d3e187171-122770



Reference 2: 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

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Balance Type:	na
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