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Organization and Summary of Significant Accounting Policies (Summary of NNN's Investment Portfolio) (Details)	9 Months Ended
	Sep. 30, 2025 ft² State Property
Property Portfolio:
Total properties | Property	3,697
Gross leasable area (square feet) | ft²	39,209,000
States | State	50
Weighted average remaining lease term (years)	10 years 1 month 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