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Organization and Summary of Significant Accounting Policies (Summary of NNN's Investment Portfolio) (Details) | 3 Months Ended
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Mar. 31, 2022 ft²
Property Portfolio: |
Total properties | 3,271
Gross leasable area (square feet) | 33,545,000
States | 48
Weighted average remaining lease term | 10 years 7 months 6 days

X
- Definition Investment Properties Total + References No definition available. + Details
Name: | nnn_InvestmentPropertiesTotal
Namespace Prefix: | nnn_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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

X
- Definition Area of a real estate property. + References No definition available. + Details
Name: | us-gaap_AreaOfRealEstateProperty
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:areaItemType
Balance Type: | na
Period Type: | instant

X
- Definition The number of states the entity operates in as of the balance sheet date. + References No definition available. + Details
Name: | us-gaap_NumberOfStatesInWhichEntityOperates
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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