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v3.6.0.2

Real Estate Assets (Properties) (Details) | Dec. 31, 2016 ft² Property
--- | ---
Industrial Properties [Member] |
Real Estate And Accumulated Depreciation [Line Items] |
Number of properties | 2
Medical Properties [Member] |
Real Estate And Accumulated Depreciation [Line Items] |
Number of properties | 2
Office Properties [Member] |
Real Estate And Accumulated Depreciation [Line Items] |
Number of properties | 15
Office/Industrial Properties [Member] |
Real Estate And Accumulated Depreciation [Line Items] |
Rentable square feet | ft² | 1,500,000
Retail Properties [Member] |
Real Estate And Accumulated Depreciation [Line Items] |
Number of properties | 6
Rentable square feet | ft² | 234,000
Residential Properties [Member] |
Real Estate And Accumulated Depreciation [Line Items] |
Number of properties | 108
Number of Limited Liability Companies | 1

X
- Definition Number of limited liability companies. + References No definition available. + Details
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Namespace Prefix: | netr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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Namespace Prefix: |
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
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- Details
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Namespace Prefix: |
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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |