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Real Estate (Impairments) (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Real Estate [Abstract]
Impairment losses – real estate and other charges, net of recoveries	$ 2,190,000	$ 2,686,000	$ 2,762,000	$ 3,714,000

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- Definition

Impairment Losses and Other Charges, Net of Recoveries

+ References

No definition available.

+ Details

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Namespace Prefix:	nnn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- References

No definition available.

+ Details

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