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Schedule III - Real Estate and Accumulated Depreciation and Amortization Under Operating Leases - Table 21 (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 | Stripes Brownsville, TX 5        
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_StripesBrownsvilleTx5Member
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land 2,033us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesBrownsvilleTx5Member
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 1,288us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesBrownsvilleTx5Member
     
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesBrownsvilleTx5Member
     
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesBrownsvilleTx5Member
     
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 2,033us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesBrownsvilleTx5Member
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 1,288us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesBrownsvilleTx5Member
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 3,321us-gaap_RealEstateGrossAtCarryingValue
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesBrownsvilleTx5Member
[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 291us-gaap_RealEstateAccumulatedDepreciation
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesBrownsvilleTx5Member
     
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 40 years      
Operating Lease | Stripes Brownsville, TX 6        
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_StripesBrownsvilleTx6Member
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land 2,530us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesBrownsvilleTx6Member
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 1,125us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesBrownsvilleTx6Member
     
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesBrownsvilleTx6Member
     
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesBrownsvilleTx6Member
     
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 2,530us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesBrownsvilleTx6Member
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 1,125us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesBrownsvilleTx6Member
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 3,655us-gaap_RealEstateGrossAtCarryingValue
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesBrownsvilleTx6Member
[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 254us-gaap_RealEstateAccumulatedDepreciation
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesBrownsvilleTx6Member
     
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 40 years      
Operating Lease | Stripes Brownsville, TX 7        
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_StripesBrownsvilleTx7Member
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land 1,039us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesBrownsvilleTx7Member
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 1,145us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesBrownsvilleTx7Member
     
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesBrownsvilleTx7Member
     
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesBrownsvilleTx7Member
     
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 1,039us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesBrownsvilleTx7Member
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 1,145us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesBrownsvilleTx7Member
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 2,184us-gaap_RealEstateGrossAtCarryingValue
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesBrownsvilleTx7Member
[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 259us-gaap_RealEstateAccumulatedDepreciation
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesBrownsvilleTx7Member
     
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 40 years      
Operating Lease | Stripes Brownsville, TX 8        
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_StripesBrownsvilleTx8Member
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land 2,417us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesBrownsvilleTx8Member
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 1,828us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesBrownsvilleTx8Member
     
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesBrownsvilleTx8Member
     
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesBrownsvilleTx8Member
     
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 2,417us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesBrownsvilleTx8Member
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 1,828us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesBrownsvilleTx8Member
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 4,245us-gaap_RealEstateGrossAtCarryingValue
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesBrownsvilleTx8Member
[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 413us-gaap_RealEstateAccumulatedDepreciation
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesBrownsvilleTx8Member
     
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 40 years      
Operating Lease | Stripes Brownsville, TX 9        
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_StripesBrownsvilleTx9Member
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land 1,279us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesBrownsvilleTx9Member
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 1,015us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesBrownsvilleTx9Member
     
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesBrownsvilleTx9Member
     
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesBrownsvilleTx9Member
     
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 1,279us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesBrownsvilleTx9Member
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 1,015us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesBrownsvilleTx9Member
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 2,294us-gaap_RealEstateGrossAtCarryingValue
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesBrownsvilleTx9Member
[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 229us-gaap_RealEstateAccumulatedDepreciation
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesBrownsvilleTx9Member
     
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 40 years      
Operating Lease | Stripes Brownsville, TX 10        
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_StripesBrownsvilleTx10Member
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land 1,182us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesBrownsvilleTx10Member
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 1,105us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesBrownsvilleTx10Member
     
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesBrownsvilleTx10Member
     
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesBrownsvilleTx10Member
     
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 1,182us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesBrownsvilleTx10Member
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 1,105us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesBrownsvilleTx10Member
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 2,287us-gaap_RealEstateGrossAtCarryingValue
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesBrownsvilleTx10Member
[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 250us-gaap_RealEstateAccumulatedDepreciation
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
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Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 40 years      
Operating Lease | Stripes Brownsville, TX 11        
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 2,915us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 2,915us-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 1,800us-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 4,715us-gaap_RealEstateGrossAtCarryingValue
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
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[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 407us-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 | Stripes Corpus Christi, TX 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 703us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
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Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 1,037us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 703us-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 1,037us-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 1,740us-gaap_RealEstateGrossAtCarryingValue
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[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 234us-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 | Stripes Corpus Christi, TX 2        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Real Estate and Accumulated Depreciation, Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
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Real Estate and Accumulated Depreciation, Initial Cost to Company, Land 1,308us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
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Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 2,151us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 1,308us-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 2,151us-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 3,459us-gaap_RealEstateGrossAtCarryingValue
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[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 486us-gaap_RealEstateAccumulatedDepreciation
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
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Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 40 years      
Operating Lease | Stripes Corpus Christi, TX 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 1,400us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
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Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 1,531us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 1,400us-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 1,531us-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 2,931us-gaap_RealEstateGrossAtCarryingValue
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[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 346us-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 | Stripes Corpus Christi, TX 4        
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 1,385us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
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Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 1,419us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 1,385us-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 1,419us-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 2,804us-gaap_RealEstateGrossAtCarryingValue
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[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 321us-gaap_RealEstateAccumulatedDepreciation
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
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Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 40 years      
Operating Lease | Stripes Corpus Christi, TX 5        
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 853us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
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Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 1,416us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 853us-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 1,416us-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 2,269us-gaap_RealEstateGrossAtCarryingValue
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
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[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 320us-gaap_RealEstateAccumulatedDepreciation
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
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Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 40 years      
Operating Lease | Stripes Donna, TX        
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 1,004us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
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Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 1,127us-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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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 1,004us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
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/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
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[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 1,127us-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 2,131us-gaap_RealEstateGrossAtCarryingValue
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
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= nnn_StripesDonnaTxMember
[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 255us-gaap_RealEstateAccumulatedDepreciation
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesDonnaTxMember
     
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 40 years      
Operating Lease | Stripes Edinburg, TX 1        
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_StripesEdinburgTx1Member
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land 970us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
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Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 1,286us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
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/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
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/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 970us-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 1,286us-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 2,256us-gaap_RealEstateGrossAtCarryingValue
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
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[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 291us-gaap_RealEstateAccumulatedDepreciation
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
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Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 40 years      
Operating Lease | Stripes Edinburg, TX 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 1,317us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
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Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 1,624us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
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/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
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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 1,317us-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 1,624us-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 2,941us-gaap_RealEstateGrossAtCarryingValue
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
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[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 367us-gaap_RealEstateAccumulatedDepreciation
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
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Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 40 years      
Operating Lease | Stripes Falfurias, TX        
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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/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
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Real Estate and Accumulated Depreciation, Initial Cost to Company, Land 4,244us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
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Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 4,458us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
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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 4,213us-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 4,458us-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 8,671us-gaap_RealEstateGrossAtCarryingValue
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
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[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 1,008us-gaap_RealEstateAccumulatedDepreciation
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
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Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 40 years      
Operating Lease | Stripes Freer, TX        
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 1,151us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
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Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 1,158us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
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/ 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 1,151us-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 1,158us-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 2,309us-gaap_RealEstateGrossAtCarryingValue
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesFreerTxMember
[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 262us-gaap_RealEstateAccumulatedDepreciation
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesFreerTxMember
     
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 40 years      
Operating Lease | Stripes George West, TX        
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 1,243us-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 695us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
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Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
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= nnn_StripesGeorgeWestTxMember
     
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 1,243us-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 695us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
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= nnn_StripesGeorgeWestTxMember
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 1,938us-gaap_RealEstateGrossAtCarryingValue
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesGeorgeWestTxMember
[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 157us-gaap_RealEstateAccumulatedDepreciation
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesGeorgeWestTxMember
     
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 40 years      
Operating Lease | Stripes Harlingen, TX 1        
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_StripesHarlingenTx1Member
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land 755us-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 601us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
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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
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesHarlingenTx1Member
     
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 755us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesHarlingenTx1Member
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 601us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesHarlingenTx1Member
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 1,356us-gaap_RealEstateGrossAtCarryingValue
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesHarlingenTx1Member
[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 136us-gaap_RealEstateAccumulatedDepreciation
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesHarlingenTx1Member
     
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 40 years      
Operating Lease | Stripes Harlingen, TX 2        
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_StripesHarlingenTx2Member
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land 906us-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 953us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
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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_StripesHarlingenTx2Member
     
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 906us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesHarlingenTx2Member
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 953us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesHarlingenTx2Member
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 1,859us-gaap_RealEstateGrossAtCarryingValue
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesHarlingenTx2Member
[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 215us-gaap_RealEstateAccumulatedDepreciation
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesHarlingenTx2Member
     
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 40 years      
Operating Lease | Stripes Harlingen, TX 3        
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_StripesHarlingenTx3Member
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land 754us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesHarlingenTx3Member
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 1,152us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesHarlingenTx3Member
     
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesHarlingenTx3Member
     
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesHarlingenTx3Member
     
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 754us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesHarlingenTx3Member
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 1,152us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesHarlingenTx3Member
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 1,906us-gaap_RealEstateGrossAtCarryingValue
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesHarlingenTx3Member
[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 260us-gaap_RealEstateAccumulatedDepreciation
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesHarlingenTx3Member
     
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 40 years      
Operating Lease | Stripes La Feria, 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_StripesLaFeriaTxMember
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land 900us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesLaFeriaTxMember
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 1,347us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesLaFeriaTxMember
     
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesLaFeriaTxMember
     
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesLaFeriaTxMember
     
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 900us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesLaFeriaTxMember
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 1,347us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesLaFeriaTxMember
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 2,247us-gaap_RealEstateGrossAtCarryingValue
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesLaFeriaTxMember
[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 304us-gaap_RealEstateAccumulatedDepreciation
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesLaFeriaTxMember
     
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 40 years      
Operating Lease | Stripes Laredo, TX 1        
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_StripesLaredoTx1Member
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land 736us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesLaredoTx1Member
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 670us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesLaredoTx1Member
     
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesLaredoTx1Member
     
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesLaredoTx1Member
     
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 736us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesLaredoTx1Member
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 670us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesLaredoTx1Member
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 1,406us-gaap_RealEstateGrossAtCarryingValue
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesLaredoTx1Member
[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 152us-gaap_RealEstateAccumulatedDepreciation
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesLaredoTx1Member
     
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 40 years      
Operating Lease | Stripes Laredo, TX 2        
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_StripesLaredoTx2Member
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land 1,553us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesLaredoTx2Member
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 1,775us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesLaredoTx2Member
     
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesLaredoTx2Member
     
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesLaredoTx2Member
     
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 1,553us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesLaredoTx2Member
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 1,775us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesLaredoTx2Member
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 3,328us-gaap_RealEstateGrossAtCarryingValue
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesLaredoTx2Member
[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 401us-gaap_RealEstateAccumulatedDepreciation
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesLaredoTx2Member
     
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 40 years      
Operating Lease | Stripes Laredo, TX 3        
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_StripesLaredoTx3Member
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land 1,495us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesLaredoTx3Member
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 1,400us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesLaredoTx3Member
     
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesLaredoTx3Member
     
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesLaredoTx3Member
     
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 1,495us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesLaredoTx3Member
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 1,400us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesLaredoTx3Member
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 2,895us-gaap_RealEstateGrossAtCarryingValue
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesLaredoTx3Member
[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 317us-gaap_RealEstateAccumulatedDepreciation
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesLaredoTx3Member
     
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 40 years      
Operating Lease | Stripes Laredo, TX 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_StripesLaredoTx4Member
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land 675us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesLaredoTx4Member
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 533us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesLaredoTx4Member
     
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesLaredoTx4Member
     
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesLaredoTx4Member
     
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 675us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesLaredoTx4Member
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 533us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesLaredoTx4Member
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 1,208us-gaap_RealEstateGrossAtCarryingValue
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesLaredoTx4Member
[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 120us-gaap_RealEstateAccumulatedDepreciation
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesLaredoTx4Member
     
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 40 years      
Operating Lease | Stripes Laredo, TX 5        
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_StripesLaredoTx5Member
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land 459us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesLaredoTx5Member
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 460us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesLaredoTx5Member
     
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesLaredoTx5Member
     
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesLaredoTx5Member
     
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 459us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesLaredoTx5Member
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 460us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesLaredoTx5Member
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 919us-gaap_RealEstateGrossAtCarryingValue
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesLaredoTx5Member
[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 104us-gaap_RealEstateAccumulatedDepreciation
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesLaredoTx5Member
     
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 40 years      
Operating Lease | Stripes Lawton, OK        
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_StripesLawtonOkMember
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land 697us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesLawtonOkMember
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 964us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
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= nnn_StripesLawtonOkMember
     
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesLawtonOkMember
     
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesLawtonOkMember
     
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 649us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesLawtonOkMember
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 964us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesLawtonOkMember
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 1,613us-gaap_RealEstateGrossAtCarryingValue
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesLawtonOkMember
[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 218us-gaap_RealEstateAccumulatedDepreciation
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesLawtonOkMember
     
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 40 years      
Operating Lease | Stripes Los Indios, 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_StripesLosIndiosTxMember
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land 1,387us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesLosIndiosTxMember
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 1,457us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesLosIndiosTxMember
     
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
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= nnn_StripesLosIndiosTxMember
     
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesLosIndiosTxMember
     
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 1,387us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesLosIndiosTxMember
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 1,457us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesLosIndiosTxMember
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 2,844us-gaap_RealEstateGrossAtCarryingValue
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesLosIndiosTxMember
[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 329us-gaap_RealEstateAccumulatedDepreciation
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesLosIndiosTxMember
     
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 40 years      
Operating Lease | Stripes McAllen, TX 1        
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_StripesMcallenTx1Member
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land 987us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesMcallenTx1Member
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 893us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
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= nnn_StripesMcallenTx1Member
     
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesMcallenTx1Member
     
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesMcallenTx1Member
     
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 987us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesMcallenTx1Member
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 893us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesMcallenTx1Member
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 1,880us-gaap_RealEstateGrossAtCarryingValue
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesMcallenTx1Member
[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 202us-gaap_RealEstateAccumulatedDepreciation
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesMcallenTx1Member
     
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 40 years      
Operating Lease | Stripes McAllen, TX 2        
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_StripesMcallenTx2Member
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land 975us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesMcallenTx2Member
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 1,030us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
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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_StripesMcallenTx2Member
     
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesMcallenTx2Member
     
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 975us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesMcallenTx2Member
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 1,030us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesMcallenTx2Member
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 2,005us-gaap_RealEstateGrossAtCarryingValue
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesMcallenTx2Member
[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 233us-gaap_RealEstateAccumulatedDepreciation
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesMcallenTx2Member
     
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 40 years      
Operating Lease | Stripes Mission, TX 1        
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_StripesMissionTx1Member
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land 880us-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 1,101us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
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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_StripesMissionTx1Member
     
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesMissionTx1Member
     
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 880us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesMissionTx1Member
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 1,101us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesMissionTx1Member
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 1,981us-gaap_RealEstateGrossAtCarryingValue
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesMissionTx1Member
[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 249us-gaap_RealEstateAccumulatedDepreciation
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesMissionTx1Member
     
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 40 years      
Operating Lease | Stripes Mission, TX 2        
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_StripesMissionTx2Member
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land 1,125us-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 1,213us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesMissionTx2Member
     
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesMissionTx2Member
     
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesMissionTx2Member
     
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 1,125us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesMissionTx2Member
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 1,213us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesMissionTx2Member
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 2,338us-gaap_RealEstateGrossAtCarryingValue
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesMissionTx2Member
[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 274us-gaap_RealEstateAccumulatedDepreciation
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesMissionTx2Member
     
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 40 years      
Operating Lease | Stripes Olmito, 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_StripesOlmitoTxMember
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land 3,688us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesOlmitoTxMember
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 2,880us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesOlmitoTxMember
     
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesOlmitoTxMember
     
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesOlmitoTxMember
     
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 3,688us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesOlmitoTxMember
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 2,880us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesOlmitoTxMember
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 6,568us-gaap_RealEstateGrossAtCarryingValue
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesOlmitoTxMember
[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 651us-gaap_RealEstateAccumulatedDepreciation
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesOlmitoTxMember
     
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 40 years      
Operating Lease | Stripes Pharr, TX 1        
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_StripesPharrTx1Member
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land 2,426us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesPharrTx1Member
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 1,881us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesPharrTx1Member
     
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesPharrTx1Member
     
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesPharrTx1Member
     
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 2,426us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesPharrTx1Member
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 1,881us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesPharrTx1Member
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 4,307us-gaap_RealEstateGrossAtCarryingValue
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesPharrTx1Member
[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 425us-gaap_RealEstateAccumulatedDepreciation
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesPharrTx1Member
     
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 40 years      
Operating Lease | Stripes Pharr, TX 2        
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_StripesPharrTx2Member
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land 784us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesPharrTx2Member
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 805us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesPharrTx2Member
     
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesPharrTx2Member
     
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesPharrTx2Member
     
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 784us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesPharrTx2Member
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 805us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesPharrTx2Member
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 1,589us-gaap_RealEstateGrossAtCarryingValue
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesPharrTx2Member
[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 182us-gaap_RealEstateAccumulatedDepreciation
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesPharrTx2Member
     
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 40 years      
Operating Lease | Stripes Pharr, TX 3        
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_StripesPharrTx3Member
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land 982us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesPharrTx3Member
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 1,178us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesPharrTx3Member
     
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesPharrTx3Member
     
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesPharrTx3Member
     
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 982us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesPharrTx3Member
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 1,178us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesPharrTx3Member
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 2,160us-gaap_RealEstateGrossAtCarryingValue
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesPharrTx3Member
[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 266us-gaap_RealEstateAccumulatedDepreciation
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesPharrTx3Member
     
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 40 years      
Operating Lease | Stripes Port Isabel, TX 1        
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_StripesPortIsabelTx1Member
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land 2,062us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesPortIsabelTx1Member
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 1,299us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesPortIsabelTx1Member
     
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesPortIsabelTx1Member
     
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesPortIsabelTx1Member
     
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 2,062us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesPortIsabelTx1Member
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 1,299us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesPortIsabelTx1Member
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 3,361us-gaap_RealEstateGrossAtCarryingValue
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesPortIsabelTx1Member
[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 294us-gaap_RealEstateAccumulatedDepreciation
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesPortIsabelTx1Member
     
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 40 years      
Operating Lease | Stripes Portland, 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_StripesPortlandTxMember
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land 656us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesPortlandTxMember
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 915us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesPortlandTxMember
     
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesPortlandTxMember
     
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesPortlandTxMember
     
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 656us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesPortlandTxMember
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 915us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesPortlandTxMember
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 1,571us-gaap_RealEstateGrossAtCarryingValue
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesPortlandTxMember
[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 207us-gaap_RealEstateAccumulatedDepreciation
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesPortlandTxMember
     
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 40 years      
Operating Lease | Stripes Progreso, 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_StripesProgresoTxMember
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land 1,769us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesProgresoTxMember
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 1,811us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesProgresoTxMember
     
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesProgresoTxMember
     
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesProgresoTxMember
     
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 1,769us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesProgresoTxMember
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 1,811us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesProgresoTxMember
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 3,580us-gaap_RealEstateGrossAtCarryingValue
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesProgresoTxMember
[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 409us-gaap_RealEstateAccumulatedDepreciation
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesProgresoTxMember
     
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 40 years      
Operating Lease | Stripes Riviera, 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_StripesRivieraTxMember
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land 2,351us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesRivieraTxMember
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 2,158us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesRivieraTxMember
     
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesRivieraTxMember
     
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesRivieraTxMember
     
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 2,351us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesRivieraTxMember
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 2,158us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesRivieraTxMember
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 4,509us-gaap_RealEstateGrossAtCarryingValue
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesRivieraTxMember
[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 488us-gaap_RealEstateAccumulatedDepreciation
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesRivieraTxMember
     
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 40 years      
Operating Lease | Stripes San Benito, TX 1        
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_StripesSanBenitoTx1Member
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land 791us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesSanBenitoTx1Member
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 1,857us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
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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_StripesSanBenitoTx1Member
     
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesSanBenitoTx1Member
     
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 791us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesSanBenitoTx1Member
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 1,857us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesSanBenitoTx1Member
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 2,648us-gaap_RealEstateGrossAtCarryingValue
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
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= nnn_StripesSanBenitoTx1Member
[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 420us-gaap_RealEstateAccumulatedDepreciation
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesSanBenitoTx1Member
     
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 40 years      
Operating Lease | Stripes San Benito, TX 2        
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_StripesSanBenitoTx2Member
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land 1,103us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesSanBenitoTx2Member
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 1,586us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
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/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
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= nnn_StripesSanBenitoTx2Member
     
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesSanBenitoTx2Member
     
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 1,103us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesSanBenitoTx2Member
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 1,586us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesSanBenitoTx2Member
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 2,689us-gaap_RealEstateGrossAtCarryingValue
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesSanBenitoTx2Member
[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 359us-gaap_RealEstateAccumulatedDepreciation
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesSanBenitoTx2Member
     
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 40 years      
Operating Lease | Stripes San Juan, TX 1        
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_StripesSanJuanTx1Member
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land 1,424us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesSanJuanTx1Member
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 1,546us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
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/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
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= nnn_StripesSanJuanTx1Member
     
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/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesSanJuanTx1Member
     
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 1,424us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesSanJuanTx1Member
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 1,546us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesSanJuanTx1Member
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 2,970us-gaap_RealEstateGrossAtCarryingValue
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesSanJuanTx1Member
[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 349us-gaap_RealEstateAccumulatedDepreciation
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesSanJuanTx1Member
     
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 40 years      
Operating Lease | Stripes San Juan, TX 2        
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_StripesSanJuanTx2Member
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land 1,124us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesSanJuanTx2Member
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 1,172us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
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/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
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= nnn_StripesSanJuanTx2Member
     
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesSanJuanTx2Member
     
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 1,124us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesSanJuanTx2Member
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 1,172us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesSanJuanTx2Member
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 2,296us-gaap_RealEstateGrossAtCarryingValue
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesSanJuanTx2Member
[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 265us-gaap_RealEstateAccumulatedDepreciation
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesSanJuanTx2Member
     
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 40 years      
Operating Lease | Stripes South Padre Island, 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_StripesSouthPadreIslandTxMember
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land 1,367us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesSouthPadreIslandTxMember
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 1,389us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
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= nnn_StripesSouthPadreIslandTxMember
     
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
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= nnn_StripesSouthPadreIslandTxMember
     
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesSouthPadreIslandTxMember
     
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 1,367us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesSouthPadreIslandTxMember
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 1,389us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesSouthPadreIslandTxMember
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 2,756us-gaap_RealEstateGrossAtCarryingValue
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesSouthPadreIslandTxMember
[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 314us-gaap_RealEstateAccumulatedDepreciation
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesSouthPadreIslandTxMember
     
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 40 years      
Operating Lease | Stripes Wichita Falls, TX 1        
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_StripesWichitaFallsTx1Member
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land 440us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesWichitaFallsTx1Member
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 751us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
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/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesWichitaFallsTx1Member
     
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesWichitaFallsTx1Member
     
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesWichitaFallsTx1Member
     
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 440us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesWichitaFallsTx1Member
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 751us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesWichitaFallsTx1Member
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 1,191us-gaap_RealEstateGrossAtCarryingValue
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesWichitaFallsTx1Member
[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 170us-gaap_RealEstateAccumulatedDepreciation
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesWichitaFallsTx1Member
     
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 40 years      
Operating Lease | Stripes Wichita Falls, TX 2        
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_StripesWichitaFallsTx2Member
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land 905us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
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/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
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Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 1,351us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
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/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
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Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
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/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
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Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesWichitaFallsTx2Member
     
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 905us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesWichitaFallsTx2Member
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 1,351us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesWichitaFallsTx2Member
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 2,256us-gaap_RealEstateGrossAtCarryingValue
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesWichitaFallsTx2Member
[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 305us-gaap_RealEstateAccumulatedDepreciation
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesWichitaFallsTx2Member
     
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 40 years      
Operating Lease | Stripes Wichita Falls, TX 3        
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_StripesWichitaFallsTx3Member
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land 484us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesWichitaFallsTx3Member
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 828us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesWichitaFallsTx3Member
     
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesWichitaFallsTx3Member
     
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesWichitaFallsTx3Member
     
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 484us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesWichitaFallsTx3Member
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 828us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesWichitaFallsTx3Member
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 1,312us-gaap_RealEstateGrossAtCarryingValue
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesWichitaFallsTx3Member
[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 187us-gaap_RealEstateAccumulatedDepreciation
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesWichitaFallsTx3Member
     
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 40 years      
Operating Lease | Stripes Palmview, 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_StripesPalmviewTxMember
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land 835us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesPalmviewTxMember
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 1,372us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesPalmviewTxMember
     
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesPalmviewTxMember
     
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesPalmviewTxMember
     
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 835us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesPalmviewTxMember
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 1,372us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesPalmviewTxMember
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 2,207us-gaap_RealEstateGrossAtCarryingValue
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesPalmviewTxMember
[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 282us-gaap_RealEstateAccumulatedDepreciation
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesPalmviewTxMember
     
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 40 years      
Operating Lease | Stripes Harlingen, TX 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_StripesHarlingenTx4Member
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land 638us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesHarlingenTx4Member
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 1,807us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesHarlingenTx4Member
     
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesHarlingenTx4Member
     
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesHarlingenTx4Member
     
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 638us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesHarlingenTx4Member
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 1,807us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesHarlingenTx4Member
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 2,445us-gaap_RealEstateGrossAtCarryingValue
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesHarlingenTx4Member
[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 363us-gaap_RealEstateAccumulatedDepreciation
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesHarlingenTx4Member
     
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 40 years      
Operating Lease | Stripes Rio Grande City, 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_StripesRioGrandeCityTxMember
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land 1,871us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesRioGrandeCityTxMember
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 1,612us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesRioGrandeCityTxMember
     
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesRioGrandeCityTxMember
     
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesRioGrandeCityTxMember
     
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 1,871us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesRioGrandeCityTxMember
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 1,612us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesRioGrandeCityTxMember
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 3,483us-gaap_RealEstateGrossAtCarryingValue
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesRioGrandeCityTxMember
[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 324us-gaap_RealEstateAccumulatedDepreciation
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesRioGrandeCityTxMember
     
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 40 years      
Operating Lease | Stripes San Juan, TX 3        
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_StripesSanJuanTx3Member
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land 816us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesSanJuanTx3Member
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 1,434us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesSanJuanTx3Member
     
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesSanJuanTx3Member
     
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesSanJuanTx3Member
     
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 816us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesSanJuanTx3Member
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 1,434us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesSanJuanTx3Member
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 2,250us-gaap_RealEstateGrossAtCarryingValue
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesSanJuanTx3Member
[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 288us-gaap_RealEstateAccumulatedDepreciation
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesSanJuanTx3Member
     
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 40 years      
Operating Lease | Stripes Zapata, 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_StripesZapataTxMember
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land 1,333us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesZapataTxMember
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 1,773us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesZapataTxMember
     
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesZapataTxMember
     
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesZapataTxMember
     
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 1,333us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesZapataTxMember
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 1,773us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesZapataTxMember
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 3,106us-gaap_RealEstateGrossAtCarryingValue
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesZapataTxMember
[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 356us-gaap_RealEstateAccumulatedDepreciation
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesZapataTxMember
     
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 40 years      
Operating Lease | Stripes Orange Grove, 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_StripesOrangeGroveTxMember
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land 1,767us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesOrangeGroveTxMember
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 1,838us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesOrangeGroveTxMember
     
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesOrangeGroveTxMember
     
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesOrangeGroveTxMember
     
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 1,767us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesOrangeGroveTxMember
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 1,838us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesOrangeGroveTxMember
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 3,605us-gaap_RealEstateGrossAtCarryingValue
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
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= nnn_StripesOrangeGroveTxMember
[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 354us-gaap_RealEstateAccumulatedDepreciation
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesOrangeGroveTxMember
     
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 40 years      
Operating Lease | Stripes Harlingen, TX 5        
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_StripesHarlingenTx5Member
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land 408us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesHarlingenTx5Member
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 826us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
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Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
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Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesHarlingenTx5Member
     
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 408us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
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= nnn_StripesHarlingenTx5Member
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 826us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
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= nnn_StripesHarlingenTx5Member
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 1,234us-gaap_RealEstateGrossAtCarryingValue
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
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= nnn_StripesHarlingenTx5Member
[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 196us-gaap_RealEstateAccumulatedDepreciation
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
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= nnn_StripesHarlingenTx5Member
     
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 30 years      
Operating Lease | Stripes Laredo, TX 6        
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_StripesLaredoTx6Member
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land 584us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
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= nnn_StripesLaredoTx6Member
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 958us-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
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 584us-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 958us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
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= nnn_StripesLaredoTx6Member
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 1,542us-gaap_RealEstateGrossAtCarryingValue
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
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= nnn_StripesLaredoTx6Member
[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 228us-gaap_RealEstateAccumulatedDepreciation
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
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= nnn_StripesLaredoTx6Member
     
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 30 years      
Operating Lease | Stripes Laredo, TX 7        
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_StripesLaredoTx7Member
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land 448us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
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= nnn_StripesLaredoTx7Member
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 734us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
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= nnn_OperatingLeaseMember
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= nnn_StripesLaredoTx7Member
     
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
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= nnn_StripesLaredoTx7Member
     
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesLaredoTx7Member
     
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 448us-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 734us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
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= nnn_StripesLaredoTx7Member
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 1,182us-gaap_RealEstateGrossAtCarryingValue
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
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= nnn_StripesLaredoTx7Member
[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 174us-gaap_RealEstateAccumulatedDepreciation
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
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Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 30 years      
Operating Lease | Stripes Laredo, TX 8        
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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Real Estate and Accumulated Depreciation, Initial Cost to Company, Land 698us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
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Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 1,169us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
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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 698us-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 1,169us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesLaredoTx8Member
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 1,867us-gaap_RealEstateGrossAtCarryingValue
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
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= nnn_StripesLaredoTx8Member
[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 278us-gaap_RealEstateAccumulatedDepreciation
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
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Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 30 years      
Operating Lease | Stripes Laredo, TX 9        
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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Real Estate and Accumulated Depreciation, Initial Cost to Company, Land 348us-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 1,168us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
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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
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Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 348us-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 1,168us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesLaredoTx9Member
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 1,516us-gaap_RealEstateGrossAtCarryingValue
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesLaredoTx9Member
[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 277us-gaap_RealEstateAccumulatedDepreciation
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
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Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 30 years      
Operating Lease | Stripes Laredo, TX 10        
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_StripesLaredoTx10Member
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land 468us-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 728us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
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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
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 468us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesLaredoTx10Member
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 728us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesLaredoTx10Member
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 1,196us-gaap_RealEstateGrossAtCarryingValue
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
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= nnn_StripesLaredoTx10Member
[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 173us-gaap_RealEstateAccumulatedDepreciation
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
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/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
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Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 30 years      
Operating Lease | Stripes San Benito, TX 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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/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
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Real Estate and Accumulated Depreciation, Initial Cost to Company, Land 420us-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 1,135us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
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Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
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= nnn_StripesSanBenitoTx3Member
     
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 420us-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 1,135us-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 1,555us-gaap_RealEstateGrossAtCarryingValue
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
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[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 270us-gaap_RealEstateAccumulatedDepreciation
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
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Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 30 years      
Operating Lease | Stripes Del Rio, TX        
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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= nnn_StripesDelRioTxMember
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land 1,565us-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 758us-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
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 1,565us-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 758us-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 2,323us-gaap_RealEstateGrossAtCarryingValue
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
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[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 135us-gaap_RealEstateAccumulatedDepreciation
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Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 40 years      
Operating Lease | Stripes Kerrville, TX        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Real Estate and Accumulated Depreciation, Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
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Real Estate and Accumulated Depreciation, Initial Cost to Company, Land 640us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
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Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 1,616us-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 640us-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 1,616us-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 2,256us-gaap_RealEstateGrossAtCarryingValue
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
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[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 288us-gaap_RealEstateAccumulatedDepreciation
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
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Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 40 years      
Operating Lease | Stripes Monahans, TX        
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_StripesMonahansTxMember
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land 2,628us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
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Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 2,973us-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 2,628us-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 2,973us-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 5,601us-gaap_RealEstateGrossAtCarryingValue
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
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[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 530us-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 | Stripes Odessa, TX        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Real Estate and Accumulated Depreciation, Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
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Real Estate and Accumulated Depreciation, Initial Cost to Company, Land 2,633us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
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= nnn_OperatingLeaseMember
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Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 3,199us-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
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 2,633us-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 3,199us-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 5,832us-gaap_RealEstateGrossAtCarryingValue
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
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[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 570us-gaap_RealEstateAccumulatedDepreciation
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
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= nnn_StripesOdessaTxMember
     
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 40 years      
Operating Lease | Stripes San Angelo, 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_StripesSanAngeloTxMember
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land 194us-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 471us-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
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 194us-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 471us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesSanAngeloTxMember
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 665us-gaap_RealEstateGrossAtCarryingValue
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesSanAngeloTxMember
[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 84us-gaap_RealEstateAccumulatedDepreciation
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesSanAngeloTxMember
     
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 40 years      
Operating Lease | Stripes Pharr, TX 4        
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 573us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
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/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
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Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 1,229us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
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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
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 573us-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 1,229us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
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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 1,802us-gaap_RealEstateGrossAtCarryingValue
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
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[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 216us-gaap_RealEstateAccumulatedDepreciation
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
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Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 40 years      
Operating Lease | Stripes Harlingen, TX 6        
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 329us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
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Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 935us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
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Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
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/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesHarlingenTx6Member
     
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesHarlingenTx6Member
     
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 329us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesHarlingenTx6Member
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 935us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesHarlingenTx6Member
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 1,264us-gaap_RealEstateGrossAtCarryingValue
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesHarlingenTx6Member
[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 217us-gaap_RealEstateAccumulatedDepreciation
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesHarlingenTx6Member
     
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 30 years      
Operating Lease | Stripes Harlingen, TX 7        
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_StripesHarlingenTx7Member
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land 277us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesHarlingenTx7Member
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 808us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesHarlingenTx7Member
     
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesHarlingenTx7Member
     
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesHarlingenTx7Member
     
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 277us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesHarlingenTx7Member
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 808us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesHarlingenTx7Member
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 1,085us-gaap_RealEstateGrossAtCarryingValue
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesHarlingenTx7Member
[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 187us-gaap_RealEstateAccumulatedDepreciation
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesHarlingenTx7Member
     
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 30 years      
Operating Lease | Stripes Laredo, TX 11        
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_StripesLaredoTx11Member
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land 325us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesLaredoTx11Member
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 816us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesLaredoTx11Member
     
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesLaredoTx11Member
     
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesLaredoTx11Member
     
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 325us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesLaredoTx11Member
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 816us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesLaredoTx11Member
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 1,141us-gaap_RealEstateGrossAtCarryingValue
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesLaredoTx11Member
[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 189us-gaap_RealEstateAccumulatedDepreciation
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesLaredoTx11Member
     
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 30 years      
Operating Lease | Stripes McAllen, TX 3        
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_StripesMcallenTx3Member
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land 643us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesMcallenTx3Member
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 1,776us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesMcallenTx3Member
     
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesMcallenTx3Member
     
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesMcallenTx3Member
     
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 643us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesMcallenTx3Member
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 1,776us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesMcallenTx3Member
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 2,419us-gaap_RealEstateGrossAtCarryingValue
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesMcallenTx3Member
[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 412us-gaap_RealEstateAccumulatedDepreciation
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesMcallenTx3Member
     
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 30 years      
Operating Lease | Stripes Port Isabel, TX 2        
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_StripesPortIsabelTx2Member
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land 299us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesPortIsabelTx2Member
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 855us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesPortIsabelTx2Member
     
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesPortIsabelTx2Member
     
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesPortIsabelTx2Member
     
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 299us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesPortIsabelTx2Member
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 855us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesPortIsabelTx2Member
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 1,154us-gaap_RealEstateGrossAtCarryingValue
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesPortIsabelTx2Member
[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 198us-gaap_RealEstateAccumulatedDepreciation
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesPortIsabelTx2Member
     
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 30 years      
Operating Lease | Stripes Brownsville, TX 12        
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_StripesBrownsvilleTx12Member
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land 843us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesBrownsvilleTx12Member
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 1,429us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesBrownsvilleTx12Member
     
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesBrownsvilleTx12Member
     
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesBrownsvilleTx12Member
     
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 843us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesBrownsvilleTx12Member
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 1,429us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesBrownsvilleTx12Member
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 2,272us-gaap_RealEstateGrossAtCarryingValue
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesBrownsvilleTx12Member
[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 237us-gaap_RealEstateAccumulatedDepreciation
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesBrownsvilleTx12Member
     
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 40 years      
Operating Lease | Stripes Edinburg, TX 3        
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_StripesEdinburgTx3Member
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land 834us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesEdinburgTx3Member
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 1,787us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesEdinburgTx3Member
     
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesEdinburgTx3Member
     
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesEdinburgTx3Member
     
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 834us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesEdinburgTx3Member
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 1,787us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesEdinburgTx3Member
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 2,621us-gaap_RealEstateGrossAtCarryingValue
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesEdinburgTx3Member
[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 296us-gaap_RealEstateAccumulatedDepreciation
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesEdinburgTx3Member
     
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 40 years      
Operating Lease | Stripes La Villa, 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_StripesLaVillaTxMember
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land 710us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesLaVillaTxMember
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 2,166us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesLaVillaTxMember
     
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
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 710us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
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[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 2,166us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
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= nnn_StripesLaVillaTxMember
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 2,876us-gaap_RealEstateGrossAtCarryingValue
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
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[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 359us-gaap_RealEstateAccumulatedDepreciation
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
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Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 40 years      
Operating Lease | Stripes Laredo, TX 12        
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 1,183us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
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Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 1,934us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
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Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements
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/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 1,183us-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 1,934us-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 3,117us-gaap_RealEstateGrossAtCarryingValue
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
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[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 320us-gaap_RealEstateAccumulatedDepreciation
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
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Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 40 years      
Operating Lease | Stripes Laredo, TX 13        
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 879us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
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Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 1,593us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
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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 879us-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 1,593us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
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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 2,472us-gaap_RealEstateGrossAtCarryingValue
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
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[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 264us-gaap_RealEstateAccumulatedDepreciation
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
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Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 40 years      
Operating Lease | Stripes McAllen, TX 4        
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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Real Estate and Accumulated Depreciation, Initial Cost to Company, Land 1,270us-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 2,383us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
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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
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 1,270us-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 2,383us-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 3,653us-gaap_RealEstateGrossAtCarryingValue
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
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[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 526us-gaap_RealEstateAccumulatedDepreciation
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
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Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 30 years      
Operating Lease | Stripes Houston, TX        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Real Estate and Accumulated Depreciation, Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
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[3]      
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land 696us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
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[3]      
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 1,458us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
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[3]      
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements
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[3]      
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
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[3]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 696us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
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[1],[2],[3]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 1,458us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
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[1],[2],[3]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 2,154us-gaap_RealEstateGrossAtCarryingValue
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
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= nnn_StripesHoustonTxMember
[1],[2],[3]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 220us-gaap_RealEstateAccumulatedDepreciation
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_StripesHoustonTxMember
[3]      
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 40 years [3]      
Operating Lease | Stripes Lubbock, TX        
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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Real Estate and Accumulated Depreciation, Initial Cost to Company, Land 671us-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 1,612us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
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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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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 671us-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 1,612us-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 2,283us-gaap_RealEstateGrossAtCarryingValue
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
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[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 244us-gaap_RealEstateAccumulatedDepreciation
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
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Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 40 years      
Operating Lease | Studio Nail and Spa Cohoes, NY        
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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/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
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Real Estate and Accumulated Depreciation, Initial Cost to Company, Land 27us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
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Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 145us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
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Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 59us-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 27us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
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[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 204us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
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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 231us-gaap_RealEstateGrossAtCarryingValue
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
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[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 44us-gaap_RealEstateAccumulatedDepreciation
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
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/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
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Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 40 years      
Operating Lease | Subway Eden Prairie, MN        
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 54us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
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Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 150us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
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Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 40 years      
Operating Lease | Subway Albany, NY        
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 | Subway Cohoes, NY        
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 | Sullivan's Steakhouse Lincolnshire, IL        
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 25 years      
Operating Lease | Sunbelt Rentals Dayton, OH        
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 | Sunbelt Rentals Shepherdsville, KY        
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 | Sunco Arnold, MD        
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 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 998us-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 | Sunco Baltimore, MD        
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 25 years      
Operating Lease | Sunco Baltimore, MD 2        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
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Operating Lease | Sunco Baltimore, MD 3        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
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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 30 years      
[1] Transactions in real estate and accumulated depreciation during 2014, 2013, and 2012 are summarized as follows: 2014 2013 2012Land, buildings, and leasehold interests: Balance at the beginning of year$4,686,844 $4,145,368 $3,531,845Acquisitions, completed construction and tenant improvements601,168 602,836 701,054Disposition of land, buildings, and leasehold interests(50,938) (57,254) (77,219)Provision for loss on impairment of real estate(823) (4,106) (10,312)Balance at the close of year$5,236,251 $4,686,844 $4,145,368Accumulated depreciation and amortization: Balance at the beginning of year$418,136 $333,778 $270,621Disposition of land, buildings, and leasehold interests(9,153) (6,778) (6,980)Depreciation and amortization expense104,192 91,136 70,137Balance at the close of year$513,175 $418,136 $333,778
[2] As of December 31, 2014, the leases are treated as either operating or financing leases for federal income tax purposes. As of December 31, 2014, the aggregate cost of the properties owned by NNN that are under operating leases were $5,119,673 and financing leases were $2,703.
[3] The tenant of this property has subleased the property. The tenant continues to be responsible for complying with all the terms of the lease agreement and is continuing to pay rent on this property to NNN.