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Organization and Basis of Presentation (Details) (Wholly Owned or Hold Equity Interest [Member])	3 Months Ended
	Mar. 31, 2014 Counterparty Property
Office Building [Member]
Real Estate Properties [Line Items]
Number of properties	11
Industrial Building [Member]
Real Estate Properties [Line Items]
Number of properties	1
Office Properties [Member]
Real Estate Properties [Line Items]
Rentable square feet	786,000
Retail Shopping Center [Member]
Real Estate Properties [Line Items]
Number of properties	4
Rentable square feet	186,000
Self Storage Facility [Member]
Real Estate Properties [Line Items]
Number of properties	7
Rentable square feet	652,000
Model Home [Member]
Real Estate Properties [Line Items]
Number of properties	81
Number of limited partnership owners	4

X

- Definition

The number of limited partnership owners of Model Homes.

+ References

No definition available.

+ Details

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