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Organization and Basis of Presentation, Dubose Model Home Income Funds (Details) (Dubose Model Home Income Funds [Member])	1 Months Ended	12 Months Ended
	Sep. 30, 2010 Offer	Dec. 31, 2013 Counterparty
Dubose Model Home Income Funds [Member]
Organization and Basis of Presentation [Line Items]
Number of tender offers	3
Number of limited partnerships the company acquired controlled of		3
Number of funds having minority ownership in DAP II		2

X

- Definition

The number of funds having minority ownership in Dubose Acquisition Partners II (DAP II).

+ References

No definition available.

+ Details

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Namespace Prefix:	netr_
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Balance Type:	na
Period Type:	duration

X

- Definition

The number of limited partnerships the company acquired controlled of after commencing tender offers for the purchase of outstanding limited partnership units.

+ References

No definition available.

+ Details

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

X

- Definition

Number of tender offers commenced during the period.

+ References

No definition available.

+ Details

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

X

- Details

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