XML 56 R51.htm IDEA: XBRL DOCUMENT v2.4.0.6

SUBSEQUENT EVENT (Details) (USD $)	6 Months Ended	58 Months Ended	6 Months Ended	58 Months Ended	6 Months Ended	58 Months Ended	1 Months Ended
	Jun. 30, 2012	Jun. 30, 2012	Jun. 30, 2012 Class B Units	Jun. 30, 2012 Class B Units	Jun. 30, 2012 General Partnership	Jun. 30, 2012 General Partnership	Aug. 31, 2012 Subsequent event	Aug. 31, 2012 Subsequent event Class B Units	Aug. 31, 2012 Subsequent event General Partnership
Subsequent events
Repurchase of depository receipts (in shares)		1,197,013	16	1,740	1	92	251
Repurchase price of depository receipts (in dollars per share)		$ 24.62					$ 26.55
Repurchase of depository receipts (in shares)				$ 587.01		$ 587.01	$ 793.50	$ 1.99	$ 0.11
Repurchase of units	$ 69,379	$ 30,549,000	$ 12,921		$ 680		$ 6,995	$ 1,581	$ 83

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 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



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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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.

+ Details

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

X

- Details

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