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Real Estate (Classification of Investment Property Leases) (Details) | 12 Months Ended
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Dec. 31, 2014
Property Subject to or Available for Operating Lease [Line Items] |
Weighted Average Remaining Lease Term | 12 years
Operating |
Property Subject to or Available for Operating Lease [Line Items] |
Number of properties leased | 2,083 nnn_NumberOfInvestmentPropertiesLeasedUnderOperatingLeases / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = us-gaap_PropertySubjectToOperatingLeaseMember
Direct financing |
Property Subject to or Available for Operating Lease [Line Items] |
Number of properties leased | 12 nnn_NumberOfInvestmentPropertiesLeasedUnderDirectFinancingLeases / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = nnn_PropertySubjectToDirectFinancingMember
Building portion – direct financing/land portion – operating |
Property Subject to or Available for Operating Lease [Line Items] |
Number of properties leased | 1 nnn_NumberOfInvestmentPropertiesLeasedUnderDirectFinancingAndOperatingLeases / us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis = nnn_BuildingPortionSubjectToDirectFinancingLandPortionSubjectToOperatingLeaseMember

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- Definition Number Of Investment Properties Leased Under Direct Financing And Operating Leases. + References No definition available. + Details
Name: | nnn_NumberOfInvestmentPropertiesLeasedUnderDirectFinancingAndOperatingLeases
Namespace Prefix: | nnn_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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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
Period Type: | instant

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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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- Details
Name: | us-gaap_PropertySubjectToOrAvailableForOperatingLeaseLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis=nnn_BuildingPortionSubjectToDirectFinancingLandPortionSubjectToOperatingLeaseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis=nnn_PropertySubjectToDirectFinancingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis=us-gaap_PropertySubjectToOperatingLeaseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |