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Major Tenants (Details) | Dec. 31, 2016 tenant
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Risks and Uncertainties [Abstract] |
Number of tenants that contributed 10% or more of company rental and earned income | 0

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- Definition Number of Tenants That Contributed 10 Percent or More of Company Rental and Earned Income + References No definition available. + Details
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Namespace Prefix: | nnn_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_RisksAndUncertaintiesAbstract
Namespace Prefix: | us-gaap_
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