XML 52 R42.htm IDEA: XBRL DOCUMENT
v3.10.0.1

PARTNERS' CAPITAL (Details) |  | 1 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Jan. 03, 2012 | Jul. 31, 2018 $ / item | Apr. 30, 2018 $ / item | Jan. 31, 2018 $ / item | Dec. 31, 2017 $ / item | Jun. 30, 2018 item $ / item | Jun. 30, 2017 $ / item | Sep. 30, 2017 $ / item | Mar. 31, 2017 $ / item | Aug. 20, 2007
Depositary receipts exchange ratio for Class A units | item |  |  |  |  |  | 30 |  |  |  |
Quarterly distributions per depositary receipt (in dollars per receipt) |  |  |  |  | (0.30) |  | (0.30) | (0.30) | (0.30) |
Quarterly distribution per unit (in dollars per unit) |  |  |  |  | 9.00 |  | 9.00 | 9.00 | 9.00 |
Special distribution per unit (in dollars per unit) |  |  |  |  | 28.50 |  |  |  |  |
Special distribution per depository receipt (in dollars per receipt) |  |  |  |  | 0.95 |  |  |  |  |
Earnings per depository receipt |  |  |  |  |  |  |  |  |  |
Net Income per Depositary Receipt (in dollars per receipt) |  |  |  |  |  | 0.52 | 1.17 |  |  |
Distributions per Depositary Receipt (in dollars per share) |  |  |  |  |  | 0.60 | 0.60 |  |  |
Limited Partner |  |  |  |  |  |  |  |  |  |
Number of classes of partners | item |  |  |  |  |  | 2 |  |  |  |
General Partnership |  |  |  |  |  |  |  |  |  |
Number of classes of partners | item |  |  |  |  |  | 1 |  |  |  |
Fixed distribution percentage of unit holders |  |  |  |  |  | 1.00% |  |  |  |
Class A |  |  |  |  |  |  |  |  |  |
Fixed distribution percentage of unit holders |  |  |  |  |  | 80.00% |  |  |  |
Forward split of depositary receipts | 3 |  |  |  |  |  |  |  |  |
Exchange ratio of depositary receipts for partnership units before adjustment | 10 |  |  |  |  |  |  |  |  |
Exchange ratio of depositary receipts for partnership units after adjustment | 30 |  |  |  |  |  |  |  |  |
Number of units in each depository receipt | 0.03333 |  |  |  |  |  |  |  |  | 0.1
Quarterly distribution per unit approved (in dollars per unit) |  |  | 9.00 | 9.00 |  |  |  |  |  |
Quarterly distributions per depositary receipt (in dollars per receipt) |  |  | (0.30) | 0.30 |  |  |  |  |  |
Class A | Subsequent event |  |  |  |  |  |  |  |  |  |
Quarterly distribution per unit approved (in dollars per unit) |  | 9.00 |  |  |  |  |  |  |  |
Quarterly distributions per depositary receipt (in dollars per receipt) |  | (0.30) |  |  |  |  |  |  |  |
Class B |  |  |  |  |  |  |  |  |  |
Fixed distribution percentage of unit holders |  |  |  |  |  | 19.00% |  |  |  |

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 exchange ratio of depositary receipts for specified partnership units after adjustment. + References No definition available. + Details
Name: | nen_DepositaryReceiptExchangeRatioOfDepositaryReceiptsForPartnershipUnitsAfterAdjustment
Namespace Prefix: | nen_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the exchange ratio of depositary receipts for specified partnership units before adjustment. + References No definition available. + Details
Name: | nen_DepositaryReceiptExchangeRatioOfDepositaryReceiptsForPartnershipUnitsBeforeAdjustment
Namespace Prefix: | nen_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the forward split of depositary receipts listed on the NYSE Amex as authorized by the entity. + References No definition available. + Details
Name: | nen_DepositaryReceiptForwardSplitConversionRatio
Namespace Prefix: | nen_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the ratio of depositary receipts to Class A units. + References No definition available. + Details
Name: | nen_DepositaryReceiptsExhangeRatioForClassUnits
Namespace Prefix: | nen_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | nen_EarningsPerDepositoryReceiptAbstract
Namespace Prefix: | nen_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the net income (loss) allocated to each outstanding depository receipt. + References No definition available. + Details
Name: | nen_NetIncomeLossPerOutstandingDepositoryReceipt
Namespace Prefix: | nen_
Data Type: | us-types:perUnitItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the distributions per depository receipt. + References No definition available. + Details
Name: | nen_PartnersCapitalAccountDistributionPerDepositoryReceipt
Namespace Prefix: | nen_
Data Type: | us-types:perUnitItemType
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 number of classes of limited partners. + References No definition available. + Details
Name: | nen_PartnersCapitalAccountNumberOfClassesOfPartners
Namespace Prefix: | nen_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the quarterly distributions per depository receipt. + References No definition available. + Details
Name: | nen_PartnersCapitalAccountQuarterlyDistributionPerDepositoryReceipt
Namespace Prefix: | nen_
Data Type: | us-types:perUnitItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the amount of quarterly distribution per unit of limited partner interest. + References No definition available. + Details
Name: | nen_PartnersCapitalAccountQuarterlyDistributionPerUnitOfLimitedPartnerInterest
Namespace Prefix: | nen_
Data Type: | us-types:perUnitItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the amount of quarterly distribution per unit of limited partner interest approved by the Board of Advisors. + References No definition available. + Details
Name: | nen_PartnersCapitalAccountQuarterlyDistributionPerUnitOfLimitedPartnerInterestApproved
Namespace Prefix: | nen_
Data Type: | us-types:perUnitItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the special distribution per depository receipt. + References No definition available. + Details
Name: | nen_PartnersCapitalAccountSpecialDistributionPerDepositoryReceipt
Namespace Prefix: | nen_
Data Type: | us-types:perUnitItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the amount of special distribution per unit of limited partner interest. + References No definition available. + Details
Name: | nen_PartnersCapitalAccountSpecialDistributionPerUnitOfLimitedPartnerInterest
Namespace Prefix: | nen_
Data Type: | us-types:perUnitItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_PartnerTypeOfPartnersCapitalAccountAxis=us-gaap_LimitedPartnerMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PartnerTypeOfPartnersCapitalAccountAxis=us-gaap_GeneralPartnerMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PartnerTypeOfPartnersCapitalAccountAxis=nen_LimitedClassAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PartnerTypeOfPartnersCapitalAccountAxis=nen_LimitedClassBMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |