Organization and Basis of Presentation, Real Estate Asset Portfolio (Details)	12 Months Ended
Dec. 31, 2014 Counterparty_Investment
Real Estate Properties [Line Items]
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	3

The number of partnerships that purchase and leaseback model homes from developers in which the company is a limited partner.

No definition available.

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