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v3.19.3.a.u2

Real Estate (Key Information for Leases) (Details) | 12 Months Ended
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Dec. 31, 2019 property
Lease classification: |
Weighted average remaining lease term (years) | 11 years 2 months 12 days
Operating |
Lease classification: |
Operating | 3,143
Direct financing |
Lease classification: |
Direct financing | 6
Minimum |
Lease classification: |
Initial lease terms | 10 years
Maximum |
Lease classification: |
Initial lease terms | 20 years

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- Definition Lessor, Lease, Term Of Contract + 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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- 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
Name: | nnn_NumberOfInvestmentPropertiesLeasedUnderOperatingLeases
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
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
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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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
Name: | srt_RangeAxis=srt_MinimumMember
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: |