XML 59 R41.htm IDEA: XBRL DOCUMENT v2.4.0.6

TREASURY UNITS (Details) (USD $)	0 Months Ended		3 Months Ended	67 Months Ended				0 Months Ended	3 Months Ended	67 Months Ended			0 Months Ended	3 Months Ended	67 Months Ended			0 Months Ended	3 Months Ended	67 Months Ended
	Aug. 08, 2008	Aug. 20, 2007	Mar. 31, 2013	Mar. 31, 2013	Mar. 06, 2008	Jan. 30, 2008	Jan. 15, 2008	Sep. 17, 2008 Class A Treasury Units	Mar. 31, 2013 Class A Treasury Units	Mar. 31, 2013 Class A Treasury Units	Jan. 03, 2012 Class A Treasury Units	Aug. 20, 2007 Class A Treasury Units	Sep. 17, 2008 Class B Treasury Units	Mar. 31, 2013 Class B Treasury Units	Mar. 31, 2013 Class B Treasury Units	Mar. 31, 2013 Class B Treasury Units Harold Brown, the treasurer of the General Partner	Mar. 31, 2013 Class B Treasury Units Ronald Brown, the president of the General Partner	Sep. 17, 2008 General Partnership	Mar. 31, 2013 General Partnership	Mar. 31, 2013 General Partnership	Mar. 31, 2013 General Partnership Harold Brown, the treasurer of the General Partner	Mar. 31, 2013 General Partnership Ronald Brown, the president of the General Partner
Treasury units (in shares)			50,185	50,185					40,148	40,148				9,535	9,535				502	502
Period for repurchase of depository receipts	12 months	12 months
Depository receipts authorized to be repurchased (in shares)		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 (in shares)				1,229,636					9,709	1,229,636				77	1,998				4	105
Repurchase price of depository receipts (in dollars per share)				$ 24.68
Repurchase price of units (in dollars per share)										$ 740.40					$ 627.53					$ 627.53
Repurchase of units (in shares)			(404)										6,309					333
Repurchase of units			$ 399,487	$ 31,786,000					$ 321,240					$ 74,335					$ 3,912
Issuance of treasury units (in shares)								6,642
Percentage of units owned by partners																75.00%	25.00%				75.00%	25.00%

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 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 percentage of issued and outstanding units owned by the partners.

+ References

No definition available.

+ Details

Name:	nen_PartnersCapitalAccountPercentageOfIssuedAndOutstandingUnitsOwnedByPartners
Namespace Prefix:	nen_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

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



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

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=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

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

X

- Definition

Units that were previously issued and then were repurchased and classified as treasury units. This element represents the number of these units which were reissued during the period.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.3-04)

-URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187085-122770

+ Details

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