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Real Estate (Impairments) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2016 | Mar. 31, 2015
Real Estate [Abstract] |  |
Impairment losses, net of recoveries | $ 572 | $ 1,028

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- Definition Impairment Losses and Other Charges, Continuing Operations + References No definition available. + Details
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Namespace Prefix: | nnn_
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Balance Type: | debit
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- References No definition available. + Details
Name: | us-gaap_RealEstateAbstract
Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration