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Real Estate (Impairments) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Real Estate [Abstract]
Impairment losses – real estate and other charges, net of recoveries	$ 2,248	$ 1,206

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- Definition

Impairment Losses and Other Charges, Net of Recoveries

+ References

No definition available.

+ Details

Name:	nnn_ImpairmentLossesAndOtherChargesNetOfRecoveries
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