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Schedule III - Real Estate and Accumulated Depreciation and Amortization Under Operating Leases - Table 17 (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
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land 1,787,519us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 2,915,411us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
     
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 536,524us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
     
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= 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
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 511,702us-gaap_RealEstateAccumulatedDepreciation
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
     
Operating Lease | Outback Largo, MD        
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_OutbackLargoMdMember
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land 1,738us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_OutbackLargoMdMember
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 2,227us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_OutbackLargoMdMember
     
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_OutbackLargoMdMember
     
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_OutbackLargoMdMember
     
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 1,738us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_OutbackLargoMdMember
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 2,227us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_OutbackLargoMdMember
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 3,965us-gaap_RealEstateGrossAtCarryingValue
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_OutbackLargoMdMember
[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 207us-gaap_RealEstateAccumulatedDepreciation
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_OutbackLargoMdMember
     
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 30 years      
Operating Lease | Outback Lufkin, 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_OutbackLufkinTxMember
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land 850us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_OutbackLufkinTxMember
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 1,147us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_OutbackLufkinTxMember
     
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_OutbackLufkinTxMember
     
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_OutbackLufkinTxMember
     
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 850us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_OutbackLufkinTxMember
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 1,147us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_OutbackLufkinTxMember
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 1,997us-gaap_RealEstateGrossAtCarryingValue
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_OutbackLufkinTxMember
[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 107us-gaap_RealEstateAccumulatedDepreciation
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_OutbackLufkinTxMember
     
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 30 years      
Operating Lease | Outback Marrero, LA        
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_OutbackMarreroLaMember
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land 781us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_OutbackMarreroLaMember
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 3,144us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_OutbackMarreroLaMember
     
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_OutbackMarreroLaMember
     
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_OutbackMarreroLaMember
     
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 781us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_OutbackMarreroLaMember
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 3,144us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_OutbackMarreroLaMember
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 3,925us-gaap_RealEstateGrossAtCarryingValue
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_OutbackMarreroLaMember
[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 351us-gaap_RealEstateAccumulatedDepreciation
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_OutbackMarreroLaMember
     
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 25 years      
Operating Lease | Outback Mechanicsville, VA        
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_OutbackMechanicsvilleVaMember
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land 674us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_OutbackMechanicsvilleVaMember
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 2,328us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_OutbackMechanicsvilleVaMember
     
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_OutbackMechanicsvilleVaMember
     
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_OutbackMechanicsvilleVaMember
     
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 674us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_OutbackMechanicsvilleVaMember
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 2,328us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_OutbackMechanicsvilleVaMember
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 3,002us-gaap_RealEstateGrossAtCarryingValue
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_OutbackMechanicsvilleVaMember
[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 217us-gaap_RealEstateAccumulatedDepreciation
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_OutbackMechanicsvilleVaMember
     
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 30 years      
Operating Lease | Outback Mt. Pleasant, SC        
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_OutbackMtPleasantScMember
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land 713us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_OutbackMtPleasantScMember
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 1,466us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_OutbackMtPleasantScMember
     
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_OutbackMtPleasantScMember
     
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_OutbackMtPleasantScMember
     
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 713us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_OutbackMtPleasantScMember
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 1,466us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_OutbackMtPleasantScMember
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 2,179us-gaap_RealEstateGrossAtCarryingValue
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_OutbackMtPleasantScMember
[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 136us-gaap_RealEstateAccumulatedDepreciation
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_OutbackMtPleasantScMember
     
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 30 years      
Operating Lease | Outback Phoenix, AZ        
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_OutbackPhoenixAzMember
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land 821us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_OutbackPhoenixAzMember
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 2,284us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_OutbackPhoenixAzMember
     
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_OutbackPhoenixAzMember
     
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_OutbackPhoenixAzMember
     
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 821us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_OutbackPhoenixAzMember
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 2,284us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_OutbackPhoenixAzMember
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 3,105us-gaap_RealEstateGrossAtCarryingValue
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_OutbackPhoenixAzMember
[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 213us-gaap_RealEstateAccumulatedDepreciation
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_OutbackPhoenixAzMember
     
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 30 years      
Operating Lease | Outback Shreveport, LA        
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 633us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 3,105us-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 3,738us-gaap_RealEstateGrossAtCarryingValue
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Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 347us-gaap_RealEstateAccumulatedDepreciation
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Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 25 years      
Operating Lease | Outback Smithfield, NC        
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, Building, Improvements & Leasehold Interests 2,345us-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 3,117us-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 | Outback Stockbridge, GA        
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, Building, Improvements & Leasehold Interests 1,988us-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 2,898us-gaap_RealEstateGrossAtCarryingValue
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Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 185us-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 | Outback Troy, OH        
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, Building, Improvements & Leasehold Interests 1,575us-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 2,031us-gaap_RealEstateGrossAtCarryingValue
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Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 126us-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 | Outback Venice, FL        
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, Building, Improvements & Leasehold Interests 2,529us-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 3,362us-gaap_RealEstateGrossAtCarryingValue
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Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 235us-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 | Outback Warrenton, 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, Gross Amount at Which Carried at Close of Period, Land 1,833us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 2,021us-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 3,854us-gaap_RealEstateGrossAtCarryingValue
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Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 30 years      
Operating Lease | Outback Wheaton, 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, Land 901us-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 654us-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 1,555us-gaap_RealEstateGrossAtCarryingValue
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[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 73us-gaap_RealEstateAccumulatedDepreciation
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Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 25 years      
Operating Lease | Outback Fultondale, AL        
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 | Palais Royale Sealy, TX        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
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Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 40 years      
Operating Lease | Panda Express Florissant, MO        
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, Building, Improvements & Leasehold Interests 228us-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 278us-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 | Pantry I Petroleum Avis, PA        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
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SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
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Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 40 years      
Operating Lease | Patient First Richmond, VA        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
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Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 30 years      
Operating Lease | Patient First York, PA        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
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Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 40 years      
Operating Lease | Patient First Mechanicsburg, PA        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
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Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 244us-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 | Patriot Fuels Vinita, OK        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
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Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 20 years      
Operating Lease | Pawn America Fargo, ND        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
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Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 35 years      
Operating Lease | Pawn America Fridley, MN        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
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Real Estate and Accumulated Depreciation, Initial Cost to Company, Land 1,013us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
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Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 30 years      
Operating Lease | Pawn America Sioux Falls, SD        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
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Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 30 years      
Operating Lease | Pawn America Mankato, MN        
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, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 40 years      
Operating Lease | Pep Boys Chicago, 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 3,756us-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 4,833us-gaap_RealEstateGrossAtCarryingValue
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Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 765us-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 | Pep Boys Cicero, 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 1,341us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
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Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 3,760us-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 1,341us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
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[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 3,760us-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 5,101us-gaap_RealEstateGrossAtCarryingValue
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[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 765us-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 | Pep Boys Cornwell Heights, PA        
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 2,058us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
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Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 3,102us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 2,058us-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 3,102us-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 5,160us-gaap_RealEstateGrossAtCarryingValue
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[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 884us-gaap_RealEstateAccumulatedDepreciation
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= nnn_PepBoysCornwellHeightsPaMember
     
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 25 years      
Operating Lease | Pep Boys East Brunswick, NJ        
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 2,449us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
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Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 5,026us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
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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 2,449us-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 5,026us-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 7,475us-gaap_RealEstateGrossAtCarryingValue
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
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[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 1,194us-gaap_RealEstateAccumulatedDepreciation
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
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= nnn_PepBoysEastBrunswickNjMember
     
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 30 years      
Operating Lease | Pep Boys Guayama, PR        
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 1,729us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
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Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 2,732us-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 1,729us-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 2,131us-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 3,860us-gaap_RealEstateGrossAtCarryingValue
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[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 329us-gaap_RealEstateAccumulatedDepreciation
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= nnn_PepBoysGuayamaPrMember
     
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 33 years      
Operating Lease | Pep Boys Jacksonville, 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 810us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
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Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 2,331us-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 810us-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 2,331us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= 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 3,141us-gaap_RealEstateGrossAtCarryingValue
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
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[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 475us-gaap_RealEstateAccumulatedDepreciation
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_PepBoysJacksonvilleFlMember
     
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 35 years      
Operating Lease | Pep Boys Joliet, IL        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Real Estate and Accumulated Depreciation, Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
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= nnn_PepBoysJolietIlMember
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land 1,506us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
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Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 3,727us-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 1,506us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
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[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 3,727us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= 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 5,233us-gaap_RealEstateGrossAtCarryingValue
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
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[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 759us-gaap_RealEstateAccumulatedDepreciation
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_PepBoysJolietIlMember
     
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 35 years      
Operating Lease | Pep Boys Lansing, IL        
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_PepBoysLansingIlMember
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land 869us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_PepBoysLansingIlMember
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 3,440us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
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Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_PepBoysLansingIlMember
     
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_PepBoysLansingIlMember
     
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 869us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
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[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 3,440us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_PepBoysLansingIlMember
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 4,309us-gaap_RealEstateGrossAtCarryingValue
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
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[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 700us-gaap_RealEstateAccumulatedDepreciation
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_PepBoysLansingIlMember
     
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 35 years      
Operating Lease | Pep Boys Las Vegas, NV        
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 1,917us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
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Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 2,530us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 1,917us-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 2,530us-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 4,447us-gaap_RealEstateGrossAtCarryingValue
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[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 515us-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 | Pep Boys Marietta, GA        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
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Real Estate and Accumulated Depreciation, Initial Cost to Company, Land 1,311us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
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Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 3,556us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 1,311us-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 3,556us-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 4,867us-gaap_RealEstateGrossAtCarryingValue
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[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 845us-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 | Pep Boys Marlton, NJ        
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 1,608us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
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Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 4,142us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 1,608us-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 4,142us-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 5,750us-gaap_RealEstateGrossAtCarryingValue
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[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 984us-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 | Pep Boys Philadelphia, PA        
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 1,300us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
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Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 3,830us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 1,300us-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 3,830us-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 5,130us-gaap_RealEstateGrossAtCarryingValue
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[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 780us-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 | Pep Boys Quakertown, PA        
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 1,129us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
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Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 3,252us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 3,252us-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 4,381us-gaap_RealEstateGrossAtCarryingValue
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[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 662us-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 | Pep Boys Reading, PA        
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 1,189us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
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Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 3,367us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 2,819us-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 4,008us-gaap_RealEstateGrossAtCarryingValue
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[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 513us-gaap_RealEstateAccumulatedDepreciation
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Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 28 years      
Operating Lease | Pep Boys Roswell, 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 931us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
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Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 2,732us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
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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 931us-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 2,732us-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 3,663us-gaap_RealEstateGrossAtCarryingValue
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[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 649us-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 | Pep Boys Turnersville, NJ        
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, Building, Improvements & Leasehold Interests 3,494us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
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Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 30 years      
Operating Lease | Pep Boys Houston, TX        
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, Building, Improvements & Leasehold Interests 3,762us-gaap_RealEstateGrossAtCarryingValue
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Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 30 years      
Operating Lease | Perkins Restaurant Des Moines, IA 1        
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, Building, Improvements & Leasehold Interests 136us-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 392us-gaap_RealEstateGrossAtCarryingValue
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Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 10 years      
Operating Lease | Perkins Restaurant Des Moines, IA 2        
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, Building, Improvements & Leasehold Interests 218us-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 488us-gaap_RealEstateGrossAtCarryingValue
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Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 10 years      
Operating Lease | Perkins Restaurant Des Moines, IA 3        
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 203us-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 429us-gaap_RealEstateGrossAtCarryingValue
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Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 194us-gaap_RealEstateAccumulatedDepreciation
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Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 10 years      
Operating Lease | Perkins Restaurant Newton, 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, 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 354us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 402us-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 756us-gaap_RealEstateGrossAtCarryingValue
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[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 383us-gaap_RealEstateAccumulatedDepreciation
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Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 10 years      
Operating Lease | Perkins Restaurant Urbandale, 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 377us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
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Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 581us-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 377us-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 581us-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 958us-gaap_RealEstateGrossAtCarryingValue
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[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 277us-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 | Pet Paradise Houston, TX 1        
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 2,306us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
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[1],[2]      
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[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 392us-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 | Pet Paradise Bunnell, FL        
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 316us-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 881us-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 1,197us-gaap_RealEstateGrossAtCarryingValue
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[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 148us-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 | Pet Paradise Charlotte, NC        
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, Building, Improvements & Leasehold Interests 3,231us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
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[1],[2]      
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Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 441us-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 | Pet Paradise Davie, FL        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
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Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 35 years      
Operating Lease | Petco Grand Forks, ND        
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, Building, Improvements & Leasehold Interests 910us-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 1,217us-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 | Petco Florissant, MO        
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 300us-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 1,371us-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 1,671us-gaap_RealEstateGrossAtCarryingValue
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[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 169us-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 | Petro Express Belmont, NC        
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 1,508us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 1,508us-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 1,622us-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 3,130us-gaap_RealEstateGrossAtCarryingValue
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[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 357us-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 | Petro Express Charlotte, NC 1        
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 1,291us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 1,291us-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 1,839us-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 3,130us-gaap_RealEstateGrossAtCarryingValue
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[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 473us-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 | Petro Express Charlotte, NC 2        
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 2,784us-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 3,720us-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 6,504us-gaap_RealEstateGrossAtCarryingValue
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[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 819us-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 | Petro Express Charlotte, NC 3        
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 1,030us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 1,030us-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 1,725us-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 2,755us-gaap_RealEstateGrossAtCarryingValue
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[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 443us-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 | Petro Express Charlotte, NC 4        
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 1,458us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 1,458us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 2,047us-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 3,505us-gaap_RealEstateGrossAtCarryingValue
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[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 526us-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 | Petro Express Charlotte, NC 5        
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 429us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
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Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 425us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
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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 429us-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 425us-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 854us-gaap_RealEstateGrossAtCarryingValue
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[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 109us-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 | Petro Express Charlotte, NC 6        
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 1,778us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
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Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 1,977us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
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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 1,778us-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 1,977us-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 3,755us-gaap_RealEstateGrossAtCarryingValue
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[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 508us-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 | Petro Express Charlotte, NC 7        
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 507us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
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Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 698us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
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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 507us-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 698us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
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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 1,205us-gaap_RealEstateGrossAtCarryingValue
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[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 269us-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 | Petro Express Charlotte, NC 8        
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 623us-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 876us-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 1,499us-gaap_RealEstateGrossAtCarryingValue
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Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 225us-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 | Petro Express Charlotte, NC 9        
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 1,810us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
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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 4,380us-gaap_RealEstateGrossAtCarryingValue
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Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 495us-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 | Petro Express Charlotte, NC 10        
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 1,697us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 4,116us-gaap_RealEstateGrossAtCarryingValue
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Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 466us-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 | Petro Express Charlotte, NC 11        
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 1,340us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
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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 3,130us-gaap_RealEstateGrossAtCarryingValue
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Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 394us-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 | Petro Express Charlotte, NC 12        
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 4,130us-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 35 years      
Operating Lease | Petro Express Charlotte, NC 13        
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 2,064us-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 4,380us-gaap_RealEstateGrossAtCarryingValue
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[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 455us-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 | Petro Express Charlotte, NC 14        
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 1,532us-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 1,532us-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 1,973us-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 3,505us-gaap_RealEstateGrossAtCarryingValue
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
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[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 434us-gaap_RealEstateAccumulatedDepreciation
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_PetroExpressCharlotteNc14Member
     
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 35 years      
Operating Lease | Petro Express Concord, NC 1        
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 1,828us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
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Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 1,677us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 1,828us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
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[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 1,677us-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 3,505us-gaap_RealEstateGrossAtCarryingValue
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
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[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 369us-gaap_RealEstateAccumulatedDepreciation
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
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= nnn_PetroExpressConcordNc1Member
     
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 35 years      
Operating Lease | Petro Express Concord, NC 2        
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 2,144us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
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Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 1,986us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 2,144us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
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[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 1,986us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
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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 4,130us-gaap_RealEstateGrossAtCarryingValue
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
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[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 437us-gaap_RealEstateAccumulatedDepreciation
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= nnn_OperatingLeaseMember
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= nnn_PetroExpressConcordNc2Member
     
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 35 years      
Operating Lease | Petro Express Denver, NC        
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 2,317us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
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Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 1,750us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
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/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 2,317us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
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[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 1,750us-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 4,067us-gaap_RealEstateGrossAtCarryingValue
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
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[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 385us-gaap_RealEstateAccumulatedDepreciation
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= nnn_OperatingLeaseMember
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Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 35 years      
Operating Lease | Petro Express Fort MIll, SC        
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 3,825us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
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Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 2,554us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
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Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 3,825us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
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[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 2,554us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
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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 6,379us-gaap_RealEstateGrossAtCarryingValue
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
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[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 563us-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 | Petro Express Gastonia, NC 1        
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 965us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
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Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 1,228us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
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Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 965us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
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[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 1,228us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
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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 2,193us-gaap_RealEstateGrossAtCarryingValue
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
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[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 270us-gaap_RealEstateAccumulatedDepreciation
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= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_PetroExpressGastoniaNc1Member
     
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 35 years      
Operating Lease | Petro Express Gastonia, NC 2        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Real Estate and Accumulated Depreciation, Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
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= nnn_PetroExpressGastoniaNc2Member
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land 745us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
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Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 760us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
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Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
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Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 745us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
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[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 760us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= 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 1,505us-gaap_RealEstateGrossAtCarryingValue
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
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[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 147us-gaap_RealEstateAccumulatedDepreciation
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
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= nnn_PetroExpressGastoniaNc2Member
     
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 40 years      
Operating Lease | Petro Express Gastonia, NC 3        
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 1,070us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
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Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 1,185us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
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Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
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Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
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/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 1,070us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
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[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 1,185us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
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= nnn_PetroExpressGastoniaNc3Member
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 2,255us-gaap_RealEstateGrossAtCarryingValue
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_PetroExpressGastoniaNc3Member
[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 261us-gaap_RealEstateAccumulatedDepreciation
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_PetroExpressGastoniaNc3Member
     
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 35 years      
Operating Lease | Petro Express Gastonia, NC 4        
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_PetroExpressGastoniaNc4Member
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land 335us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_PetroExpressGastoniaNc4Member
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 545us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_PetroExpressGastoniaNc4Member
     
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_PetroExpressGastoniaNc4Member
     
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_PetroExpressGastoniaNc4Member
     
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 335us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_PetroExpressGastoniaNc4Member
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 545us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_PetroExpressGastoniaNc4Member
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 880us-gaap_RealEstateGrossAtCarryingValue
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_PetroExpressGastoniaNc4Member
[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 105us-gaap_RealEstateAccumulatedDepreciation
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_PetroExpressGastoniaNc4Member
     
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 40 years      
Operating Lease | Petro Express Hickory, NC        
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_PetroExpressHickoryNcMember
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land 1,975us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_PetroExpressHickoryNcMember
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 1,530us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_PetroExpressHickoryNcMember
     
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_PetroExpressHickoryNcMember
     
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_PetroExpressHickoryNcMember
     
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 1,975us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_PetroExpressHickoryNcMember
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 1,530us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_PetroExpressHickoryNcMember
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 3,505us-gaap_RealEstateGrossAtCarryingValue
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_PetroExpressHickoryNcMember
[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 337us-gaap_RealEstateAccumulatedDepreciation
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_PetroExpressHickoryNcMember
     
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 35 years      
Operating Lease | Petro Express Kings Mountain, NC        
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_PetroExpressKingsMountainNcMember
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land 1,210us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_PetroExpressKingsMountainNcMember
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 982us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_PetroExpressKingsMountainNcMember
     
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_PetroExpressKingsMountainNcMember
     
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_PetroExpressKingsMountainNcMember
     
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 1,210us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_PetroExpressKingsMountainNcMember
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 982us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_PetroExpressKingsMountainNcMember
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 2,192us-gaap_RealEstateGrossAtCarryingValue
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_PetroExpressKingsMountainNcMember
[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization $ 216us-gaap_RealEstateAccumulatedDepreciation
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_PetroExpressKingsMountainNcMember
     
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 35 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.