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Organization and Basis of Presentation, Dubose Model Home Income Funds (Details) (Dubose Model Home Income Funds [Member]) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2010 Offer | Dec. 31, 2013 Counterparty
Dubose Model Home Income Funds [Member] |  |
Organization and Basis of Presentation [Line Items] |  |
Number of tender offers | 3 |
Number of limited partnerships the company acquired controlled of |  | 3
Number of funds having minority ownership in DAP II |  | 2

X
- Definition The number of funds having minority ownership in Dubose Acquisition Partners II (DAP II). + References No definition available. + Details
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Namespace Prefix: | netr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of limited partnerships the company acquired controlled of after commencing tender offers for the purchase of outstanding limited partnership units. + References No definition available. + Details
Name: | netr_NumberOfLimitedPartnershipsCompanyAcquiredControlledOf
Namespace Prefix: | netr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of tender offers commenced during the period. + References No definition available. + Details
Name: | netr_NumberOfTenderOffers
Namespace Prefix: | netr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Details
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Namespace Prefix: | netr_
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