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Real Estate (Classification of Investment Property Leases) (Details)
 3 Months Ended
Mar. 31, 2015
Property Subject to or Available for Operating Lease [Line Items]  
Weighted average remaining lease term (years) 11 years 6 months
Operating  
Property Subject to or Available for Operating Lease [Line Items]  
Number of properties leased-operating 2,140nnn_NumberOfInvestmentPropertiesLeasedUnderOperatingLeases
/ us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis
= us-gaap_PropertySubjectToOperatingLeaseMember
Direct financing  
Property Subject to or Available for Operating Lease [Line Items]  
Number of properties leased-direct financing 11nnn_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-building portion-direct financing land portion-operating 1nnn_NumberOfInvestmentPropertiesLeasedUnderDirectFinancingAndOperatingLeases
/ us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis
= nnn_BuildingPortionSubjectToDirectFinancingLandPortionSubjectToOperatingLeaseMember