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v3.20.2

Real Estate (Key Information for Leases) (Details) - property | 3 Months Ended | 6 Months Ended
--- | --- | ---
Sep. 30, 2020 | Jun. 30, 2020 | Jun. 30, 2020
Lease classification: |  |  |
Operating |  | 3,128 | 3,128
Direct financing |  | 6 | 6
Weighted average remaining lease term |  |  | 10 years 10 months 24 days
Percent of tenants with rent deferral agreements |  | 21.00% |
Term of rent deferred |  | 2 months 12 days |
Percent of deferred rent due |  | 86.00% |
Percent of deferred rent due by June 30, 2021 |  | 66.00% | 66.00%
Percent of deferred rent due by December 31, 2021 |  | 94.00% | 94.00%
Forecast [Member] |  |  |
Lease classification: |  |  |
Percent of deferred rent due | 14.00% |  |
Minimum |  |  |
Lease classification: |  |  |
Initial lease term |  |  | 10 years
Maximum |  |  |
Lease classification: |  |  |
Initial lease term |  |  | 20 years

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- Definition Lessor Lease, Average Term Of Rent Deferred + References No definition available. + Details
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Balance Type: | na
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- Definition Lessor Lease, Percent Of Rent Deferred + References No definition available. + Details
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Namespace Prefix: | nnn_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Lessor Lease, Percent Of Rent Due By First Half Of Year Two + References No definition available. + Details
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- Definition Lessor Lease, Percent Of Rent Due By Second Half Of Year Two + References No definition available. + Details
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Data Type: | num:percentItemType
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- Definition Lessor Lease, Percent Of Tenants With Rent Deferral Agreements + References No definition available. + Details
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Namespace Prefix: | nnn_
Data Type: | num:percentItemType
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- Definition Lessor, Lease, Term Of Contract + References No definition available. + Details
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- 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
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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
Name: | us-gaap_LeasesAbstract
Namespace Prefix: | us-gaap_
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- Details
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Namespace Prefix: |
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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: |
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Balance Type: |
Period Type: |