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Organization and Basis of Presentation (Details) | 12 Months Ended
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Dec. 31, 2015 Counterparty_Investment Segment
Organization Consolidation And Presentation Of Financial Statements [Abstract] |
Number of limited partnerships in which the company is sole General Partner | 3
Number of partnerships that purchase and leaseback model homes from developers in which the company is a limited partner | 2
Number of limited liability corporation that purchase and leaseback model homes from developers in which the company is a limited partner | 1
Number of reportable segments | Segment | 3

X
- Definition Number of limited liability that purchase and leaseback model homes from developers in which company is limited partner. + References No definition available. + Details
Name: | netr_NumberOfLimitedLiabilityThatPurchaseAndLeasebackModelHomesFromDevelopersInWhichCompanyIsLimitedPartner
Namespace Prefix: | netr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- 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

X
- 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
Name: | netr_NumberOfPartnershipsThatPurchaseAndLeasebackModelHomesFromDevelopersInWhichCompanyIsLimitedPartner
Namespace Prefix: | netr_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. + References No definition available. + Details
Name: | us-gaap_NumberOfReportableSegments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract
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