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Real Estate (Classification Of Investment Property Leases) (Details) | 6 Months Ended
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Jun. 30, 2014
Property Subject to or Available for Operating Lease [Line Items] |
Weighted average remaining lease term (in years) | 12 years
Operating |
Property Subject to or Available for Operating Lease [Line Items] |
Number of properties leased-operating | 1,957
Direct financing |
Property Subject to or Available for Operating Lease [Line Items] |
Number of properties leased-direct financing | 12
Building portion – direct financing / land portion – operating |
Property Subject to or Available for Operating Lease [Line Items] |
Number of properties leased-building portion-direct financing land portion-operating | 1

X
- 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

X
- 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

X
- Definition Weighted Average Remaining Lease Term, Years + References No definition available. + Details
Name: | nnn_WeightedAverageRemainingLeaseTermYears
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