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Real Estate (Classification of Investment Property Leases) (Details) | 12 Months Ended
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Dec. 31, 2018 property
Lease classification: |
Weighted average remaining lease term (years) | 11 years 6 months
Operating |
Lease classification: |
Operating | 2,970
Direct financing |
Lease classification: |
Direct financing | 8
Building portion – direct financing / land portion – operating |
Lease classification: |
Building portion – direct financing / land portion – operating | 1

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- Definition Number Of Investment Properties Leased Under Direct Financing And Operating Leases. + 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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- Definition Number of Investment Properties leased under the direct financing method + 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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- Definition Total number of Investment Properties leased under operating leases + 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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- Definition Weighted Average Remaining Lease Term + References No definition available. + Details
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Namespace Prefix: | nnn_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |