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Real Estate (Classification of Investment Property Leases) (Details)
 12 Months Ended
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 2,083nnn_NumberOfInvestmentPropertiesLeasedUnderOperatingLeases
/ us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis
= us-gaap_PropertySubjectToOperatingLeaseMember
Direct financing  
Property Subject to or Available for Operating Lease [Line Items]  
Number of properties leased 12nnn_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 1nnn_NumberOfInvestmentPropertiesLeasedUnderDirectFinancingAndOperatingLeases
/ us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis
= nnn_BuildingPortionSubjectToDirectFinancingLandPortionSubjectToOperatingLeaseMember