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v2.4.1.9

Real Estate Assets (Properties) (Details) | 12 Months Ended
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Dec. 31, 2014 Counterparty_Investment
Real Estate And Accumulated Depreciation [Line Items] |
Number of limited partnerships in which the company is sole General Partner | 3 netr_NumberOfLimitedPartnershipsInWhichCompanyIsSoleGeneralPartner
Industrial Office Properties [Member] |
Real Estate And Accumulated Depreciation [Line Items] |
Number of properties | 14 us-gaap_NumberOfRealEstateProperties / us-gaap_StatementBusinessSegmentsAxis = netr_IndustrialOfficePropertiesMember
Rentable square feet | 1,142,000 us-gaap_AreaOfRealEstateProperty / us-gaap_StatementBusinessSegmentsAxis = netr_IndustrialOfficePropertiesMember
Retail Properties [Member] |
Real Estate And Accumulated Depreciation [Line Items] |
Number of properties | 5 us-gaap_NumberOfRealEstateProperties / us-gaap_StatementBusinessSegmentsAxis = netr_RetailPropertiesMember
Rentable square feet | 230,000 us-gaap_AreaOfRealEstateProperty / us-gaap_StatementBusinessSegmentsAxis = netr_RetailPropertiesMember
Self Storage Properties [Member] |
Real Estate And Accumulated Depreciation [Line Items] |
Number of properties | 7 us-gaap_NumberOfRealEstateProperties / us-gaap_StatementBusinessSegmentsAxis = netr_SelfStoragePropertiesMember
Rentable square feet | 666,000 us-gaap_AreaOfRealEstateProperty / us-gaap_StatementBusinessSegmentsAxis = netr_SelfStoragePropertiesMember
Residential Properties [Member] |
Real Estate And Accumulated Depreciation [Line Items] |
Number of properties | 54 us-gaap_NumberOfRealEstateProperties / us-gaap_StatementBusinessSegmentsAxis = netr_ResidentialPropertiesMember
Number of limited partnerships in which the company is sole General Partner | 3 netr_NumberOfLimitedPartnershipsInWhichCompanyIsSoleGeneralPartner / us-gaap_StatementBusinessSegmentsAxis = netr_ResidentialPropertiesMember

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- Definition The number of limited partnerships in which the company is the sole General Partner. + References No definition available. + Details
Name: | netr_NumberOfLimitedPartnershipsInWhichCompanyIsSoleGeneralPartner
Namespace Prefix: | netr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Area of a real estate property. + References No definition available. + Details
Name: | us-gaap_AreaOfRealEstateProperty
Namespace Prefix: | us-gaap_
Data Type: | num:areaItemType
Balance Type: | na
Period Type: | instant

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- Definition The number of real estate properties owned as of the balance sheet date. + References No definition available. + Details
Name: | us-gaap_NumberOfRealEstateProperties
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | us-gaap_RealEstateAndAccumulatedDepreciationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=netr_IndustrialOfficePropertiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=netr_ResidentialPropertiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=netr_RetailPropertiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=netr_SelfStoragePropertiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |