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Organization and Basis of Presentation, Real Estate Asset Portfolio (Details) | 12 Months Ended
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Dec. 31, 2013 Counterparty Investment
Real Estate Properties [Line Items] |
Number of limited partnerships in which the company is sole General Partner | 5
Number of limited liability companies in which the company is sole Managing Member | 1
Number of partnerships that purchase and leaseback model homes from developers in which the company is a limited partner | 6
Number of investment assets | 1
Office Building [Member] | Wholly Owned or Hold Equity Interest [Member] |
Real Estate Properties [Line Items] |
Number of properties | 11
Industrial Building [Member] | Wholly Owned or Hold Equity Interest [Member] |
Real Estate Properties [Line Items] |
Number of properties | 1
Office Properties [Member] | Wholly Owned or Hold Equity Interest [Member] |
Real Estate Properties [Line Items] |
Rentable square feet | 786,000
Retail Shopping Center [Member] | Wholly Owned or Hold Equity Interest [Member] |
Real Estate Properties [Line Items] |
Number of properties | 4
Rentable square feet | 186,000
Self Storage Facility [Member] | Wholly Owned or Hold Equity Interest [Member] |
Real Estate Properties [Line Items] |
Number of properties | 7
Rentable square feet | 652,000
Model Home [Member] | Wholly Owned or Hold Equity Interest [Member] |
Real Estate Properties [Line Items] |
Number of properties | 77
Number of limited partnership owners | 4
Dubose Model Home Investors Fund 113 [Member] | Model Home [Member] |
Real Estate Properties [Line Items] |
Number of properties | 1

X
- Definition The total number of investment assets. + References No definition available. + Details
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Balance Type: | na
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X
- Definition The number of limited liability companies in which the company is the sole Managing Member. + References No definition available. + Details
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Namespace Prefix: | netr_
Data Type: | xbrli:integerItemType
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- Definition The number of limited partnership owners of Model Homes. + References No definition available. + Details
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Namespace Prefix: | netr_
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- Definition The number of limited partnerships in which the company is the sole General Partner. + References No definition available. + Details
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- Definition The number of partnerships that purchase and leaseback model homes from developers in which the company is a limited partner. + References No definition available. + Details
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Namespace Prefix: | netr_
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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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Data Type: | xbrli:integerItemType
Balance Type: | na
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X
- Details
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