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v3.3.1.900

Real Estate Assets (Properties) (Details) | 12 Months Ended
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Dec. 31, 2015 ft² Counterparty_Investment Property
Real Estate And Accumulated Depreciation [Line Items] |
Number of limited partnerships in which the company is sole General Partner | Counterparty_Investment | 3
Industrial 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 | 18
Office/Industrial Properties [Member] |
Real Estate And Accumulated Depreciation [Line Items] |
Rentable square feet | ft² | 1,614,000
Retail Properties [Member] |
Real Estate And Accumulated Depreciation [Line Items] |
Number of properties | 6
Rentable square feet | ft² | 236,000
Residential Properties [Member] |
Real Estate And Accumulated Depreciation [Line Items] |
Number of properties | 64
Number of limited partnerships in which the company is sole General Partner | Counterparty_Investment | 3
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 The number of limited partnerships in which the company is the sole General Partner. + References No definition available. + Details
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Namespace Prefix: | netr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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

X
- Definition The number of real estate properties owned as of the balance sheet date. + References No definition available. + Details
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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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- Details
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Period Type: |

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- Details
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Namespace Prefix: |
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Period Type: |

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

X
- Details
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Namespace Prefix: |
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Period Type: |