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v3.20.2

Subsequent Events (Details) - Subsequent event | Oct. 12, 2020
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Subsequent Event [Line Items] |
Percent of rent collected for previous quarter | 90.00%
Percent of rent collected for current month | 94.00%

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- Definition Lessor Lease, Percent Of Rent Collected For Current Month + References No definition available. + Details
Name: | nnn_LessorLeasePercentOfRentCollectedForCurrentMonth
Namespace Prefix: | nnn_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Lessor Lease, Percent Of Rent Collected For Previous Quarter + References No definition available. + Details
Name: | nnn_LessorLeasePercentOfRentCollectedForPreviousQuarter
Namespace Prefix: | nnn_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |