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Organization and Basis of Presentation, Real Estate Asset Portfolio (Details) | 12 Months Ended
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Dec. 31, 2014 Counterparty_Investment
Real Estate Properties [Line Items] |
Number of limited partnerships in which the company is sole General Partner | 3 netr_NumberOfLimitedPartnershipsInWhichCompanyIsSoleGeneralPartner
Number of partnerships that purchase and leaseback model homes from developers in which the company is a limited partner | 3 netr_NumberOfPartnershipsThatPurchaseAndLeasebackModelHomesFromDevelopersInWhichCompanyIsLimitedPartner

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

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- Details
Name: | us-gaap_RealEstatePropertiesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration