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Schedule III - Real Estate and Accumulated Depreciation and Amortization Under Operating Leases - Table 12 (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests $ 5,236,251us-gaap_RealEstateGrossAtCarryingValue $ 4,686,844us-gaap_RealEstateGrossAtCarryingValue $ 4,145,368us-gaap_RealEstateGrossAtCarryingValue $ 3,531,845us-gaap_RealEstateGrossAtCarryingValue
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 513,175us-gaap_RealEstateAccumulatedDepreciation 418,136us-gaap_RealEstateAccumulatedDepreciation 333,778us-gaap_RealEstateAccumulatedDepreciation 270,621us-gaap_RealEstateAccumulatedDepreciation
Operating Lease        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Real Estate and Accumulated Depreciation, Encumbrances 26,000us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
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Real Estate and Accumulated Depreciation, Initial Cost to Company, Land 1,787,519us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
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= nnn_OperatingLeaseMember
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 2,915,411us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
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= nnn_OperatingLeaseMember
     
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 536,524us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements
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= nnn_OperatingLeaseMember
     
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
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= nnn_OperatingLeaseMember
     
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 1,785,779us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 3,414,698us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 5,200,477us-gaap_RealEstateGrossAtCarryingValue
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= nnn_OperatingLeaseMember
[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 511,702us-gaap_RealEstateAccumulatedDepreciation
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
     
Operating Lease | Health Source Chiropractic Houston, TX        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Real Estate and Accumulated Depreciation, Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_HealthSourceChiropracticHoustonTxMember
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land 112us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
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= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_HealthSourceChiropracticHoustonTxMember
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 509us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
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= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_HealthSourceChiropracticHoustonTxMember
     
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 302us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements
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= nnn_HealthSourceChiropracticHoustonTxMember
     
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_HealthSourceChiropracticHoustonTxMember
     
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 112us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
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= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_HealthSourceChiropracticHoustonTxMember
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 811us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
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= nnn_HealthSourceChiropracticHoustonTxMember
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 923us-gaap_RealEstateGrossAtCarryingValue
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= nnn_OperatingLeaseMember
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= nnn_HealthSourceChiropracticHoustonTxMember
[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 134us-gaap_RealEstateAccumulatedDepreciation
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= nnn_OperatingLeaseMember
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= nnn_HealthSourceChiropracticHoustonTxMember
     
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 40 years      
Operating Lease | Healthy Pet Suwanee, GA        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Real Estate and Accumulated Depreciation, Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
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Real Estate and Accumulated Depreciation, Initial Cost to Company, Land 175us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
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= nnn_HealthyPetSuwaneeGaMember
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 1,038us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
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Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements
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= nnn_HealthyPetSuwaneeGaMember
     
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
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= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_HealthyPetSuwaneeGaMember
     
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 175us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
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= nnn_OperatingLeaseMember
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= nnn_HealthyPetSuwaneeGaMember
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 1,038us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
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= nnn_OperatingLeaseMember
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[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 1,213us-gaap_RealEstateGrossAtCarryingValue
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= nnn_HealthyPetSuwaneeGaMember
[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 209us-gaap_RealEstateAccumulatedDepreciation
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Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 40 years      
Operating Lease | Healthy Pet Colonial Heights, VA        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Real Estate and Accumulated Depreciation, Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
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Real Estate and Accumulated Depreciation, Initial Cost to Company, Land 160us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
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= nnn_HealthyPetColonialHeightsVaMember
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 746us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
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Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements
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= nnn_HealthyPetColonialHeightsVaMember
     
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
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= nnn_OperatingLeaseMember
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= nnn_HealthyPetColonialHeightsVaMember
     
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 160us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
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[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 746us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
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= nnn_HealthyPetColonialHeightsVaMember
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 906us-gaap_RealEstateGrossAtCarryingValue
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= nnn_HealthyPetColonialHeightsVaMember
[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 148us-gaap_RealEstateAccumulatedDepreciation
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= nnn_HealthyPetColonialHeightsVaMember
     
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 40 years      
Operating Lease | Hear USA Lapeer, MI        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Real Estate and Accumulated Depreciation, Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
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Real Estate and Accumulated Depreciation, Initial Cost to Company, Land 29us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
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Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 211us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
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Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements
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Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
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= nnn_HearUsaLapeerMiMember
     
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 29us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
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[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 201us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
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[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 230us-gaap_RealEstateGrossAtCarryingValue
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[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 38us-gaap_RealEstateAccumulatedDepreciation
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= nnn_HearUsaLapeerMiMember
     
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 40 years      
Operating Lease | Hibbett Sports Sealy, TX        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Real Estate and Accumulated Depreciation, Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
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Real Estate and Accumulated Depreciation, Initial Cost to Company, Land 208us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
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Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 230us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
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Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements
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Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 208us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
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[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 230us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
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[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 438us-gaap_RealEstateGrossAtCarryingValue
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[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 95us-gaap_RealEstateAccumulatedDepreciation
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Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 40 years      
Operating Lease | Hog Pit Tucson, AZ        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Real Estate and Accumulated Depreciation, Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
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Real Estate and Accumulated Depreciation, Initial Cost to Company, Land 827us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
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Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 305us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
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Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 18us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements
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Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 845us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
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[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 305us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
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[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 1,150us-gaap_RealEstateGrossAtCarryingValue
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[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 114us-gaap_RealEstateAccumulatedDepreciation
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Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 40 years      
Operating Lease | Hollywood Feed Ridgeland, MS        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Real Estate and Accumulated Depreciation, Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
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Real Estate and Accumulated Depreciation, Initial Cost to Company, Land 343us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
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Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 411us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
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Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 362us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 343us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 773us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
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[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 1,116us-gaap_RealEstateGrossAtCarryingValue
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[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 135us-gaap_RealEstateAccumulatedDepreciation
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Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 40 years      
Operating Lease | Home Decor Memphis, TN        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Real Estate and Accumulated Depreciation, Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
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Real Estate and Accumulated Depreciation, Initial Cost to Company, Land 549us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
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Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 540us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
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Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 364us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements
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Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 549us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
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[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 904us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
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[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 1,453us-gaap_RealEstateGrossAtCarryingValue
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[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 341us-gaap_RealEstateAccumulatedDepreciation
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Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 40 years      
Operating Lease | Home Depot Sunrise, FL        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Real Estate and Accumulated Depreciation, Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
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Real Estate and Accumulated Depreciation, Initial Cost to Company, Land 5,149us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
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Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 0us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 5,149us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
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[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 5,149us-gaap_RealEstateGrossAtCarryingValue
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[1],[2]      
Operating Lease | Home Zone Furniture Arlington, TX        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Real Estate and Accumulated Depreciation, Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
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Real Estate and Accumulated Depreciation, Initial Cost to Company, Land 435us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
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Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 2,300us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
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Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 334us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements
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Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 435us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
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[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 2,634us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
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[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 3,069us-gaap_RealEstateGrossAtCarryingValue
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[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 653us-gaap_RealEstateAccumulatedDepreciation
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Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 38 years      
Operating Lease | HomeGoods Fairfax, VA        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Real Estate and Accumulated Depreciation, Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
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Real Estate and Accumulated Depreciation, Initial Cost to Company, Land 523us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
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Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 756us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
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Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 1,585us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements
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Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 971us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 2,341us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
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[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 3,312us-gaap_RealEstateGrossAtCarryingValue
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[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 811us-gaap_RealEstateAccumulatedDepreciation
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Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 40 years      
Operating Lease | Hometown Urgent Care Warren, OH        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Real Estate and Accumulated Depreciation, Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
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Real Estate and Accumulated Depreciation, Initial Cost to Company, Land 562us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
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Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 468us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
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Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 100us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements
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Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 562us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
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[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 568us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
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[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 1,130us-gaap_RealEstateGrossAtCarryingValue
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[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 162us-gaap_RealEstateAccumulatedDepreciation
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Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 40 years      
Operating Lease | Hooters Tampa, FL        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Real Estate and Accumulated Depreciation, Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
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Real Estate and Accumulated Depreciation, Initial Cost to Company, Land 784us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
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Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 505us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
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Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements
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Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 784us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
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[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 505us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
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[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 1,289us-gaap_RealEstateGrossAtCarryingValue
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[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 165us-gaap_RealEstateAccumulatedDepreciation
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Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 40 years      
Operating Lease | Humana Sunrise, FL        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Real Estate and Accumulated Depreciation, Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
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Real Estate and Accumulated Depreciation, Initial Cost to Company, Land 800us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
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Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 253us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 800us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
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[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 253us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
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[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 1,053us-gaap_RealEstateGrossAtCarryingValue
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[1],[2]      
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Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 40 years      
Operating Lease | Hurrican Grill and Wings Chandler, AZ        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
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[1],[2]      
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[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 1,504us-gaap_RealEstateGrossAtCarryingValue
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[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 254us-gaap_RealEstateAccumulatedDepreciation
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Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 40 years      
Operating Lease | Hy-Vee St. Joseph, MO        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
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[1],[2]      
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Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 40 years      
Operating Lease | Insurance Auto Auctions New Orleans, LA        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
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[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 3,987us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
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[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 5,432us-gaap_RealEstateGrossAtCarryingValue
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[1],[2]      
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Operating Lease | Insurance Auto Auctions E Dundee, IL        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
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[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 2,772us-gaap_RealEstateGrossAtCarryingValue
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[1],[2]      
Operating Lease | Int'l House of Pancakes Midwest City, OK        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Real Estate and Accumulated Depreciation, Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
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[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 407us-gaap_RealEstateGrossAtCarryingValue
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[1],[2]      
Operating Lease | Int'l House of Pancakes Ankeny, IA        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Real Estate and Accumulated Depreciation, Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
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Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 515us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 693us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
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[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 515us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
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[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 1,208us-gaap_RealEstateGrossAtCarryingValue
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[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 164us-gaap_RealEstateAccumulatedDepreciation
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Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 30 years      
Operating Lease | ISD Renal Corpus Christi, TX        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Real Estate and Accumulated Depreciation, Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
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Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 4,036us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 406us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
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[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 4,036us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
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[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 4,442us-gaap_RealEstateGrossAtCarryingValue
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[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 409us-gaap_RealEstateAccumulatedDepreciation
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Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 30 years      
Operating Lease | ISD Renal Kendallville, IN        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Real Estate and Accumulated Depreciation, Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
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Real Estate and Accumulated Depreciation, Initial Cost to Company, Land 66us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 66us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 2,748us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
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[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 2,814us-gaap_RealEstateGrossAtCarryingValue
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[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 239us-gaap_RealEstateAccumulatedDepreciation
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Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 35 years      
Operating Lease | ISD Renal Memphis, TN 1        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
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Real Estate and Accumulated Depreciation, Initial Cost to Company, Land 180us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 180us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
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[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 3,223us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
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[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 3,403us-gaap_RealEstateGrossAtCarryingValue
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[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 327us-gaap_RealEstateAccumulatedDepreciation
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Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 30 years      
Operating Lease | ISD Renal Memphis, TN 2        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Real Estate and Accumulated Depreciation, Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
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Real Estate and Accumulated Depreciation, Initial Cost to Company, Land 283us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 283us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 4,146us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
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[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 4,429us-gaap_RealEstateGrossAtCarryingValue
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[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 420us-gaap_RealEstateAccumulatedDepreciation
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Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 30 years      
Operating Lease | J & J Insurance Hollywood, FL        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Real Estate and Accumulated Depreciation, Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
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Real Estate and Accumulated Depreciation, Initial Cost to Company, Land 195us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
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Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 44us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 119us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 0us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
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[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 119us-gaap_RealEstateGrossAtCarryingValue
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Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 0us-gaap_RealEstateAccumulatedDepreciation
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Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 15 years      
Operating Lease | Jack in the Box Plano, TX        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Real Estate and Accumulated Depreciation, Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
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Real Estate and Accumulated Depreciation, Initial Cost to Company, Land 1,055us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 1,055us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
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[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 1,237us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
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[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 2,292us-gaap_RealEstateGrossAtCarryingValue
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[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 295us-gaap_RealEstateAccumulatedDepreciation
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Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 40 years      
Operating Lease | Jacobson Industrial Des Moines, IA        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Real Estate and Accumulated Depreciation, Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
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Real Estate and Accumulated Depreciation, Initial Cost to Company, Land 61us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
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Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 61us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
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[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 112us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
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[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 173us-gaap_RealEstateGrossAtCarryingValue
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[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 54us-gaap_RealEstateAccumulatedDepreciation
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Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 20 years      
Operating Lease | Jared Jewelers Richmond, VA        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Real Estate and Accumulated Depreciation, Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
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Real Estate and Accumulated Depreciation, Initial Cost to Company, Land 955us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 955us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
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[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 1,336us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
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[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 2,291us-gaap_RealEstateGrossAtCarryingValue
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[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 436us-gaap_RealEstateAccumulatedDepreciation
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Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 40 years      
Operating Lease | Jared Jewelers Brandon, FL        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Real Estate and Accumulated Depreciation, Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
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Real Estate and Accumulated Depreciation, Initial Cost to Company, Land 1,197us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 1,182us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
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[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 2,379us-gaap_RealEstateGrossAtCarryingValue
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[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 374us-gaap_RealEstateAccumulatedDepreciation
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Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 40 years      
Operating Lease | Jared Jewelers Lithonia, GA        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Real Estate and Accumulated Depreciation, Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
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Real Estate and Accumulated Depreciation, Initial Cost to Company, Land 1,271us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
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Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 1,216us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 1,216us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
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[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 2,487us-gaap_RealEstateGrossAtCarryingValue
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[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 384us-gaap_RealEstateAccumulatedDepreciation
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Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 40 years      
Operating Lease | Jared Jewelers Houston, TX        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Real Estate and Accumulated Depreciation, Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
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Real Estate and Accumulated Depreciation, Initial Cost to Company, Land 1,676us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
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Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 1,440us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
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[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 1,440us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
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[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 3,116us-gaap_RealEstateGrossAtCarryingValue
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[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 433us-gaap_RealEstateAccumulatedDepreciation
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Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 40 years      
Operating Lease | Jared Jewelers Oviedo, FL        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Real Estate and Accumulated Depreciation, Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 1,328us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
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[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 1,328us-gaap_RealEstateGrossAtCarryingValue
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[1],[2]      
Operating Lease | Jazzercise Fitness Center Orlando, FL        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Real Estate and Accumulated Depreciation, Encumbrances 17us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
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[3]      
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land 37us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
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Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 101us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 37us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 101us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
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[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 138us-gaap_RealEstateGrossAtCarryingValue
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[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 28us-gaap_RealEstateAccumulatedDepreciation
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Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 40 years      
Operating Lease | Jiffy Lube - Auburn, MA        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Real Estate and Accumulated Depreciation, Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
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Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 856us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 455us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
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[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 856us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
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[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 1,311us-gaap_RealEstateGrossAtCarryingValue
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[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 11us-gaap_RealEstateAccumulatedDepreciation
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Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 35 years      
Operating Lease | Jiffy Lube - Ayer, MA        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Real Estate and Accumulated Depreciation, Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
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[1],[2]      
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[1],[2]      
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Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 30 years      
Operating Lease | Jiffy Lube - Barrington, IL        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Real Estate and Accumulated Depreciation, Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
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Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 30 years      
Operating Lease | Jiffy Lube - Berwyn, IL        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
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[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 1,068us-gaap_RealEstateGrossAtCarryingValue
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Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 35 years      
Operating Lease | Jiffy Lube - Bolingbrook, IL        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 185us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 562us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 747us-gaap_RealEstateGrossAtCarryingValue
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Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 9us-gaap_RealEstateAccumulatedDepreciation
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Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 30 years      
Operating Lease | Jiffy Lube - Burbank, IL        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Real Estate and Accumulated Depreciation, Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 418us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
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[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 574us-gaap_RealEstateGrossAtCarryingValue
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Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 10us-gaap_RealEstateAccumulatedDepreciation
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Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 20 years      
Operating Lease | Jiffy Lube - Plattsburgh, NY        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Real Estate and Accumulated Depreciation, Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 421us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
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[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 548us-gaap_RealEstateGrossAtCarryingValue
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Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 25 years      
Operating Lease | Jiffy Lube - Romeoville, IL        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Real Estate and Accumulated Depreciation, Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
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Real Estate and Accumulated Depreciation, Initial Cost to Company, Land 158us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 158us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 557us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
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[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 715us-gaap_RealEstateGrossAtCarryingValue
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Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 9us-gaap_RealEstateAccumulatedDepreciation
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Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 30 years      
Operating Lease | Jiffy Lube - Worcester, MA        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Real Estate and Accumulated Depreciation, Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 287us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
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[1],[2]      
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[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 11us-gaap_RealEstateAccumulatedDepreciation
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Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 35 years      
Operating Lease | Jin's Asian Cafe Sealy, TX        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Real Estate and Accumulated Depreciation, Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
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[1],[2]      
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Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 30us-gaap_RealEstateAccumulatedDepreciation
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Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 40 years      
Operating Lease | Jo-Ann etc Corpus Christi, TX        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Real Estate and Accumulated Depreciation, Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
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[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 1,727us-gaap_RealEstateGrossAtCarryingValue
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[1],[2]      
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Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 40 years      
Operating Lease | Jo-Ann etc St Peters, MO        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Real Estate and Accumulated Depreciation, Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
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[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 8,380us-gaap_RealEstateGrossAtCarryingValue
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Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 40 years      
Operating Lease | Johnny Carino's Lubbock, TX        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Real Estate and Accumulated Depreciation, Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
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[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 2,213us-gaap_RealEstateGrossAtCarryingValue
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[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization $ 393us-gaap_RealEstateAccumulatedDepreciation
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Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 40 years      
[1] Transactions in real estate and accumulated depreciation during 2014, 2013, and 2012 are summarized as follows: 2014 2013 2012Land, buildings, and leasehold interests: Balance at the beginning of year$4,686,844 $4,145,368 $3,531,845Acquisitions, completed construction and tenant improvements601,168 602,836 701,054Disposition of land, buildings, and leasehold interests(50,938) (57,254) (77,219)Provision for loss on impairment of real estate(823) (4,106) (10,312)Balance at the close of year$5,236,251 $4,686,844 $4,145,368Accumulated depreciation and amortization: Balance at the beginning of year$418,136 $333,778 $270,621Disposition of land, buildings, and leasehold interests(9,153) (6,778) (6,980)Depreciation and amortization expense104,192 91,136 70,137Balance at the close of year$513,175 $418,136 $333,778
[2] As of December 31, 2014, the leases are treated as either operating or financing leases for federal income tax purposes. As of December 31, 2014, the aggregate cost of the properties owned by NNN that are under operating leases were $5,119,673 and financing leases were $2,703.
[3] Property is encumbered as a part of NNN's $6,952 long-term, fixed rate mortgage and security agreement.