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Real Estate Assets (Properties) (Details)	12 Months Ended
	Dec. 31, 2014 Counterparty_Investment
Real Estate And Accumulated Depreciation [Line Items]
Number of limited partnerships in which the company is sole General Partner	3netr_NumberOfLimitedPartnershipsInWhichCompanyIsSoleGeneralPartner
Industrial Office Properties [Member]
Real Estate And Accumulated Depreciation [Line Items]
Number of properties	14us-gaap_NumberOfRealEstateProperties / us-gaap_StatementBusinessSegmentsAxis = netr_IndustrialOfficePropertiesMember
Rentable square feet	1,142,000us-gaap_AreaOfRealEstateProperty / us-gaap_StatementBusinessSegmentsAxis = netr_IndustrialOfficePropertiesMember
Retail Properties [Member]
Real Estate And Accumulated Depreciation [Line Items]
Number of properties	5us-gaap_NumberOfRealEstateProperties / us-gaap_StatementBusinessSegmentsAxis = netr_RetailPropertiesMember
Rentable square feet	230,000us-gaap_AreaOfRealEstateProperty / us-gaap_StatementBusinessSegmentsAxis = netr_RetailPropertiesMember
Self Storage Properties [Member]
Real Estate And Accumulated Depreciation [Line Items]
Number of properties	7us-gaap_NumberOfRealEstateProperties / us-gaap_StatementBusinessSegmentsAxis = netr_SelfStoragePropertiesMember
Rentable square feet	666,000us-gaap_AreaOfRealEstateProperty / us-gaap_StatementBusinessSegmentsAxis = netr_SelfStoragePropertiesMember
Residential Properties [Member]
Real Estate And Accumulated Depreciation [Line Items]
Number of properties	54us-gaap_NumberOfRealEstateProperties / us-gaap_StatementBusinessSegmentsAxis = netr_ResidentialPropertiesMember
Number of limited partnerships in which the company is sole General Partner	3netr_NumberOfLimitedPartnershipsInWhichCompanyIsSoleGeneralPartner / us-gaap_StatementBusinessSegmentsAxis = netr_ResidentialPropertiesMember

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

Area of a real estate property.

+ References

No definition available.

+ Details

Name:	us-gaap_AreaOfRealEstateProperty
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

Name:	us-gaap_NumberOfRealEstateProperties
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	us-gaap_RealEstateAndAccumulatedDepreciationLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=netr_IndustrialOfficePropertiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=netr_ResidentialPropertiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=netr_RetailPropertiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementBusinessSegmentsAxis=netr_SelfStoragePropertiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: