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Real Estate (Classification of Investment Property Leases) (Details) | 6 Months Ended
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Jun. 30, 2018 property option
Lease classification: |
Weighted average remaining lease term (years) | 11 years 6 months
Number of renewal options, or more | option | 1
Operating |
Lease classification: |
Operating | 2,856
Direct financing |
Lease classification: |
Direct financing | 7
Building portion – direct financing/land portion – operating |
Lease classification: |
Building portion – direct financing/land portion – operating | 2

X
- Definition Number Of Investment Properties Leased Under Direct Financing And Operating Leases. + References No definition available. + Details
Name: | nnn_NumberOfInvestmentPropertiesLeasedUnderDirectFinancingAndOperatingLeases
Namespace Prefix: | nnn_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of Investment Properties leased under the direct financing method + References No definition available. + Details
Name: | nnn_NumberOfInvestmentPropertiesLeasedUnderDirectFinancingLeases
Namespace Prefix: | nnn_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Total number of Investment Properties leased under operating leases + References No definition available. + Details
Name: | nnn_NumberOfInvestmentPropertiesLeasedUnderOperatingLeases
Namespace Prefix: | nnn_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of Renewal Options + References No definition available. + Details
Name: | nnn_NumberofRenewalOptions
Namespace Prefix: | nnn_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Weighted Average Remaining Lease Term + References No definition available. + Details
Name: | nnn_WeightedAverageRemainingLeaseTerm
Namespace Prefix: | nnn_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_LeasesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis=us-gaap_PropertySubjectToOperatingLeaseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis=nnn_PropertySubjectToDirectFinancingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis=nnn_BuildingPortionSubjectToDirectFinancingLandPortionSubjectToOperatingLeaseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |