XML 47 R31.htm IDEA: XBRL DOCUMENT
v3.20.1

Real Estate (Real Estate Commitments) (Details) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2020 USD ($) property
Real Estate [Abstract] |
Number of properties | property | 17
Period for improvements to construction commitments | 12 months
Total commitment | $ 74,525
Less amount funded | 56,055
Remaining commitment | $ 18,470

X
- Definition Period for Improvements to Construction Commitments + References No definition available. + Details
Name: | nnn_PeriodforImprovementstoConstructionCommitments
Namespace Prefix: | nnn_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Real Estate Investment, Funding Commitments + References No definition available. + Details
Name: | nnn_RealEstateInvestmentFundingCommitments
Namespace Prefix: | nnn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Real Estate Investment, Funding Commitments, Amount Funded + References No definition available. + Details
Name: | nnn_RealEstateInvestmentFundingCommitmentsAmountFunded
Namespace Prefix: | nnn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Real Estate Investment, Funding Commitments, Remaining Commitment + References No definition available. + Details
Name: | nnn_RealEstateInvestmentFundingCommitmentsRemainingCommitment
Namespace Prefix: | nnn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Real Estate Investment Funding Construction Commitments, Number Of Properties + References No definition available. + Details
Name: | nnn_RealEstateInvestmentFundingConstructionCommitmentsNumberOfProperties
Namespace Prefix: | nnn_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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