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Schedule III - Real Estate and Accumulated Depreciation and Amortization Under Operating Leases - Table 13 (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 | Kangaroo Express Carthage, NC        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Real Estate and Accumulated Depreciation, Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_KangarooExpressCarthageNcMember
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land 485us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_KangarooExpressCarthageNcMember
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 354us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_KangarooExpressCarthageNcMember
     
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_KangarooExpressCarthageNcMember
     
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_KangarooExpressCarthageNcMember
     
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 485us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_KangarooExpressCarthageNcMember
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 354us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_KangarooExpressCarthageNcMember
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 839us-gaap_RealEstateGrossAtCarryingValue
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_KangarooExpressCarthageNcMember
[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 74us-gaap_RealEstateAccumulatedDepreciation
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_KangarooExpressCarthageNcMember
     
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 40 years      
Operating Lease | Kangaroo Express Sanford, NC 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_KangarooExpressSanfordNc1Member
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land 666us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_KangarooExpressSanfordNc1Member
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 661us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_KangarooExpressSanfordNc1Member
     
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_KangarooExpressSanfordNc1Member
     
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_KangarooExpressSanfordNc1Member
     
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 666us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_KangarooExpressSanfordNc1Member
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 661us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_KangarooExpressSanfordNc1Member
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 1,327us-gaap_RealEstateGrossAtCarryingValue
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_KangarooExpressSanfordNc1Member
[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 138us-gaap_RealEstateAccumulatedDepreciation
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_KangarooExpressSanfordNc1Member
     
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 40 years      
Operating Lease | Kangaroo Express Sanford, NC 2        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Real Estate and Accumulated Depreciation, Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_KangarooExpressSanfordNc2Member
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land 1,638us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_KangarooExpressSanfordNc2Member
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 1,371us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_KangarooExpressSanfordNc2Member
     
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_KangarooExpressSanfordNc2Member
     
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_KangarooExpressSanfordNc2Member
     
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 1,638us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_KangarooExpressSanfordNc2Member
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 1,371us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_KangarooExpressSanfordNc2Member
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 3,009us-gaap_RealEstateGrossAtCarryingValue
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_KangarooExpressSanfordNc2Member
[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 287us-gaap_RealEstateAccumulatedDepreciation
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_KangarooExpressSanfordNc2Member
     
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 40 years      
Operating Lease | Kangaroo Express Siler City, NC        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Real Estate and Accumulated Depreciation, Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_KangarooExpressSilerCityNcMember
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land 586us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_KangarooExpressSilerCityNcMember
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 645us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_KangarooExpressSilerCityNcMember
     
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_KangarooExpressSilerCityNcMember
     
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_KangarooExpressSilerCityNcMember
     
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 586us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_KangarooExpressSilerCityNcMember
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 645us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_KangarooExpressSilerCityNcMember
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 1,231us-gaap_RealEstateGrossAtCarryingValue
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_KangarooExpressSilerCityNcMember
[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 135us-gaap_RealEstateAccumulatedDepreciation
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_KangarooExpressSilerCityNcMember
     
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 40 years      
Operating Lease | Kangaroo Express West End, NC        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Real Estate and Accumulated Depreciation, Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_KangarooExpressWestEndNcMember
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land 426us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_KangarooExpressWestEndNcMember
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 516us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_KangarooExpressWestEndNcMember
     
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_KangarooExpressWestEndNcMember
     
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_KangarooExpressWestEndNcMember
     
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 397us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_KangarooExpressWestEndNcMember
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 516us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_KangarooExpressWestEndNcMember
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 913us-gaap_RealEstateGrossAtCarryingValue
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_KangarooExpressWestEndNcMember
[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 108us-gaap_RealEstateAccumulatedDepreciation
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_KangarooExpressWestEndNcMember
     
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 40 years      
Operating Lease | Kangaroo Express Belleview, FL        
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_KangarooExpressBelleviewFlMember
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land 471us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_KangarooExpressBelleviewFlMember
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 1,451us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_KangarooExpressBelleviewFlMember
     
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_KangarooExpressBelleviewFlMember
     
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_KangarooExpressBelleviewFlMember
     
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 471us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_KangarooExpressBelleviewFlMember
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 1,451us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_KangarooExpressBelleviewFlMember
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 1,922us-gaap_RealEstateGrossAtCarryingValue
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_KangarooExpressBelleviewFlMember
[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 304us-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 | Kangaroo Express Jacksonville, FL 1        
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 | Kangaroo Express Jacksonville, FL 2        
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 | Kangaroo Express Destin, FL        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
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Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 40 years      
Operating Lease | Kangaroo Express Niceville, FL        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
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Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 40 years [3]      
Operating Lease | Kangaroo Express Kill Devil Hills, NC 1        
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 | Kangaroo Express Kill Devil Hills, NC 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, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 552us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
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[1],[2]      
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[1],[2]      
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Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 40 years      
Operating Lease | Kangaroo Express Interlachen, FL        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Real Estate and Accumulated Depreciation, Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 1,500us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 2,019us-gaap_RealEstateGrossAtCarryingValue
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Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 255us-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 | Kangaroo Express Clarksville, TN 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, Gross Amount at Which Carried at Close of Period, Land 276us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 955us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
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Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 192us-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 | Kangaroo Express Clarksville, TN 2        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 521us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 710us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 1,231us-gaap_RealEstateGrossAtCarryingValue
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Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 143us-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 | Kangaroo Express Gallatin, TN        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Real Estate and Accumulated Depreciation, Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 1,231us-gaap_RealEstateGrossAtCarryingValue
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Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 40 years      
Operating Lease | Kangaroo Express Midland City, AL        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Real Estate and Accumulated Depreciation, Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
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Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 40 years      
Operating Lease | Kangaroo Express Naples, FL 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 3,195us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 1,403us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 4,388us-gaap_RealEstateGrossAtCarryingValue
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Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 282us-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 | Kangaroo Express Oxford, MS        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Real Estate and Accumulated Depreciation, Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
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[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 1,537us-gaap_RealEstateGrossAtCarryingValue
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Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 220us-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 | Kangaroo Express Columbiana, AL        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Real Estate and Accumulated Depreciation, Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 989us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 1,760us-gaap_RealEstateGrossAtCarryingValue
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Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 40 years      
Operating Lease | Kangaroo Express Naples, FL 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, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 4,759us-gaap_RealEstateGrossAtCarryingValue
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Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 314us-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 | Kangaroo Express Longs, SC        
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 758us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 1,503us-gaap_RealEstateGrossAtCarryingValue
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Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 148us-gaap_RealEstateAccumulatedDepreciation
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Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 40 years      
Operating Lease | Kangaroo Express Kentwood, LA        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
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Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 174us-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 | Kangaroo Express Dothan, AL        
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 | Kangaroo Express Naples, FL 3        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Real Estate and Accumulated Depreciation, Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
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Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 303us-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 | Kangaroo Express Cary, NC        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Real Estate and Accumulated Depreciation, Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 2,125us-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 3,439us-gaap_RealEstateGrossAtCarryingValue
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Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 392us-gaap_RealEstateAccumulatedDepreciation
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Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 40 years      
Operating Lease | Kangaroo Express - Havelock, NC        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Real Estate and Accumulated Depreciation, Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 170us-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 681us-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 851us-gaap_RealEstateGrossAtCarryingValue
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[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 10us-gaap_RealEstateAccumulatedDepreciation
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Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 30 years      
Operating Lease | Kangaroo Express - Statesville, NC        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Real Estate and Accumulated Depreciation, Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
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Real Estate and Accumulated Depreciation, Initial Cost to Company, Land 249us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
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Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 653us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
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Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 249us-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 653us-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 902us-gaap_RealEstateGrossAtCarryingValue
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[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 9us-gaap_RealEstateAccumulatedDepreciation
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Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 35 years      
Operating Lease | KARM Home Store Knoxville, TN        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
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Real Estate and Accumulated Depreciation, Initial Cost to Company, Land 467us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
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Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 735us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 467us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 735us-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 1,202us-gaap_RealEstateGrossAtCarryingValue
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[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 293us-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 | Kash n' Karry Seffner, FL        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Real Estate and Accumulated Depreciation, Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
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Real Estate and Accumulated Depreciation, Initial Cost to Company, Land 322us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 322us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 1,222us-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 1,544us-gaap_RealEstateGrossAtCarryingValue
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[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 342us-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 | Keg Steakhouse Lynnwood, WA        
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 1,256us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
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Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 649us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 1,256us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 649us-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 1,905us-gaap_RealEstateGrossAtCarryingValue
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[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 212us-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 | KFC Fenton, MO        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Real Estate and Accumulated Depreciation, Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
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Real Estate and Accumulated Depreciation, Initial Cost to Company, Land 307us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
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Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 496us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 307us-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 496us-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 803us-gaap_RealEstateGrossAtCarryingValue
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[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 339us-gaap_RealEstateAccumulatedDepreciation
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Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 33 years      
Operating Lease | KFC Erie, PA        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Real Estate and Accumulated Depreciation, Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
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Real Estate and Accumulated Depreciation, Initial Cost to Company, Land 517us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
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Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 496us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
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Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 517us-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 496us-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 1,013us-gaap_RealEstateGrossAtCarryingValue
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[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 162us-gaap_RealEstateAccumulatedDepreciation
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Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 40 years      
Operating Lease | KFC Marysville, WA        
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 647us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
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Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 546us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
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Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 40 years      
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SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 532us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
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= nnn_KfcRichmondVa1Member
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 472us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_KfcRichmondVa1Member
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 1,004us-gaap_RealEstateGrossAtCarryingValue
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_KfcRichmondVa1Member
[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 40us-gaap_RealEstateAccumulatedDepreciation
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_KfcRichmondVa1Member
     
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 25 years      
Operating Lease | KFC Richmond, VA 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_KfcRichmondVa2Member
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land 452us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_KfcRichmondVa2Member
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 452us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
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= nnn_KfcRichmondVa2Member
     
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_KfcRichmondVa2Member
     
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_KfcRichmondVa2Member
     
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 452us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
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= nnn_KfcRichmondVa2Member
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 452us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_KfcRichmondVa2Member
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 904us-gaap_RealEstateGrossAtCarryingValue
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
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= nnn_KfcRichmondVa2Member
[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 38us-gaap_RealEstateAccumulatedDepreciation
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_KfcRichmondVa2Member
     
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 25 years      
Operating Lease | KFC Richmond, VA 3        
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_KfcRichmondVa3Member
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land 552us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_KfcRichmondVa3Member
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 532us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
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= nnn_KfcRichmondVa3Member
     
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_KfcRichmondVa3Member
     
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
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= nnn_KfcRichmondVa3Member
     
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 552us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
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= nnn_KfcRichmondVa3Member
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 532us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_KfcRichmondVa3Member
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 1,084us-gaap_RealEstateGrossAtCarryingValue
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_KfcRichmondVa3Member
[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 45us-gaap_RealEstateAccumulatedDepreciation
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_KfcRichmondVa3Member
     
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 25 years      
Operating Lease | KFC Richmond, VA 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_KfcRichmondVa4Member
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land 492us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_KfcRichmondVa4Member
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 452us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
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= nnn_KfcRichmondVa4Member
     
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
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= nnn_KfcRichmondVa4Member
     
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
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= nnn_KfcRichmondVa4Member
     
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 492us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
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= nnn_KfcRichmondVa4Member
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 452us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_KfcRichmondVa4Member
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 944us-gaap_RealEstateGrossAtCarryingValue
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_KfcRichmondVa4Member
[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 27us-gaap_RealEstateAccumulatedDepreciation
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_KfcRichmondVa4Member
     
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 35 years      
Operating Lease | KFC Richmond, VA 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_KfcRichmondVa5Member
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land 481us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_KfcRichmondVa5Member
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 1,253us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
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= nnn_KfcRichmondVa5Member
     
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_KfcRichmondVa5Member
     
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 481us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
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= nnn_KfcRichmondVa5Member
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 1,253us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_KfcRichmondVa5Member
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 1,734us-gaap_RealEstateGrossAtCarryingValue
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_KfcRichmondVa5Member
[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 106us-gaap_RealEstateAccumulatedDepreciation
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_KfcRichmondVa5Member
     
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 25 years      
Operating Lease | KFC Virginia Beach, VA        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Real Estate and Accumulated Depreciation, Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_KfcVirginiaBeachVaMember
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land 402us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_KfcVirginiaBeachVaMember
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 482us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_KfcVirginiaBeachVaMember
     
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
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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 402us-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 482us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_KfcVirginiaBeachVaMember
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 884us-gaap_RealEstateGrossAtCarryingValue
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_KfcVirginiaBeachVaMember
[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 41us-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 25 years      
Operating Lease | KFC Ahoskie, NC        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Real Estate and Accumulated Depreciation, Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_KFCAhoskieNCMember
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land 393us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_KFCAhoskieNCMember
     
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 1,012us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_KFCAhoskieNCMember
     
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 393us-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 1,012us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_KFCAhoskieNCMember
[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 1,405us-gaap_RealEstateGrossAtCarryingValue
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
= nnn_KFCAhoskieNCMember
[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 42us-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 25 years      
Operating Lease | KFC Elizabeth City, NC        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Real Estate and Accumulated Depreciation, Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
= nnn_OperatingLeaseMember
/ us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis
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Real Estate and Accumulated Depreciation, Initial Cost to Company, Land 197us-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 1,209us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
/ nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis
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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 197us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 1,406us-gaap_RealEstateGrossAtCarryingValue
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Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 50us-gaap_RealEstateAccumulatedDepreciation
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Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 25 years      
Operating Lease | KFC - Brownsville, 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, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 778us-gaap_RealEstateGrossAtCarryingValue
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Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 35 years      
Operating Lease | KFC - Brownsville, TX2        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 1,199us-gaap_RealEstateGrossAtCarryingValue
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Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 25 years      
Operating Lease | KFC - Copperas Cove, TX        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 1,003us-gaap_RealEstateGrossAtCarryingValue
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Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 24us-gaap_RealEstateAccumulatedDepreciation
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Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 30 years      
Operating Lease | KFC - Del Rio, TX        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 246us-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 699us-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 | KFC - Eagle Pass, TX        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Real Estate and Accumulated Depreciation, Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
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[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 1,297us-gaap_RealEstateGrossAtCarryingValue
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[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 41us-gaap_RealEstateAccumulatedDepreciation
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Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 25 years      
Operating Lease | KFC - Edinburg, 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, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 1,237us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
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[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 1,689us-gaap_RealEstateGrossAtCarryingValue
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Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 40us-gaap_RealEstateAccumulatedDepreciation
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Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 30 years      
Operating Lease | KFC - Harker Heights, 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, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 35 years      
Operating Lease | KFC - Harlingen, TX        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 1,836us-gaap_RealEstateGrossAtCarryingValue
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Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 25 years      
Operating Lease | KFC - Jacksonville, TX        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 562us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
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Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 25 years      
Operating Lease | KFC - Killeen, TX        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 1,454us-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 | KFC - Laredo, TX        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
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Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 30 years      
Operating Lease | KFC - Marshall, TX        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Real Estate and Accumulated Depreciation, Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
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[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 798us-gaap_RealEstateGrossAtCarryingValue
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Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 25 years      
Operating Lease | KFC - McAllen, TX        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Real Estate and Accumulated Depreciation, Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
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[1],[2]      
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 1,542us-gaap_RealEstateGrossAtCarryingValue
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[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 40us-gaap_RealEstateAccumulatedDepreciation
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Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 25 years      
Operating Lease | KFC - Mission, 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, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 30 years      
Operating Lease | KFC - Palestine, TX        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
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Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 25 years      
Operating Lease | KFC - Pharr, TX        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
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Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 30 years      
Operating Lease | KFC - Rio Grande City, TX        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
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Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 35 years      
Operating Lease | KFC - S Padre Island, TX        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
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Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 30 years      
Operating Lease | KFC - San Benito, TX        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
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Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 30 years      
Operating Lease | KFC - Temple, 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, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 25 years      
Operating Lease | KFC - Tyler, TX        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 739us-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 | KFC - Waco, TX        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
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Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 30 years      
Operating Lease | KFC - Waco, TX2        
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 | KFC - Weslaco, TX        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
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Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 30 years      
Operating Lease | Kohl's Florence, AL        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
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Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 186us-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 | Kroger - Elkhart, IN        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Real Estate and Accumulated Depreciation, Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 2,091us-gaap_RealEstateGrossAtCarryingValue
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Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 15 years      
Operating Lease | Kum & Go Omaha, NE        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Real Estate and Accumulated Depreciation, Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 393us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 214us-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 607us-gaap_RealEstateGrossAtCarryingValue
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[1],[2]      
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 102us-gaap_RealEstateAccumulatedDepreciation
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Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 20 years      
Operating Lease | Kwik Pik Bear Creek, PA        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Real Estate and Accumulated Depreciation, Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
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Real Estate and Accumulated Depreciation, Initial Cost to Company, Land 191us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
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Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 191us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 230us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 421us-gaap_RealEstateGrossAtCarryingValue
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Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 108us-gaap_RealEstateAccumulatedDepreciation
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Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 20 years      
Operating Lease | Kwik Pik Bradford, PA        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Real Estate and Accumulated Depreciation, Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 762us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
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Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 357us-gaap_RealEstateAccumulatedDepreciation
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Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 20 years      
Operating Lease | Kwik Pik Coraopolis, PA        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 476us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 823us-gaap_RealEstateGrossAtCarryingValue
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Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 20 years [3]      
Operating Lease | Kwik Pik St Clair, PA        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 212us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 475us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 687us-gaap_RealEstateGrossAtCarryingValue
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Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 223us-gaap_RealEstateAccumulatedDepreciation
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Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 20 years      
Operating Lease | Kwik Pik Bear Creek Township, PA        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
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Real Estate and Accumulated Depreciation, Initial Cost to Company, Land 689us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
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Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests 275us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements
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Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 275us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 964us-gaap_RealEstateGrossAtCarryingValue
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Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 128us-gaap_RealEstateAccumulatedDepreciation
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Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 20 years [3]      
Operating Lease | Kwik Pik Beech Creek, PA        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Real Estate and Accumulated Depreciation, Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
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Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements 0us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 477us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 613us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
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Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 40 years      
Operating Lease | Kwik Pik Canisteo, NY        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Real Estate and Accumulated Depreciation, Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
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Real Estate and Accumulated Depreciation, Initial Cost to Company, Land 142us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land 142us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests 485us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 627us-gaap_RealEstateGrossAtCarryingValue
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Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization 109us-gaap_RealEstateAccumulatedDepreciation
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Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 40 years      
Operating Lease | Kwik Pik Curwensville, PA        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
Real Estate and Accumulated Depreciation, Encumbrances 0us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances
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Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests 834us-gaap_RealEstateGrossAtCarryingValue
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Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 40 years      
Operating Lease | Kwik Pik Ellwood City, PA        
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]        
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Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization $ 118us-gaap_RealEstateAccumulatedDepreciation
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Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed 40 years      
[1] Transactions in real estate and accumulated depreciation during 2014, 2013, and 2012 are summarized as follows: 2014 2013 2012Land, buildings, and leasehold interests: Balance at the beginning of year$4,686,844 $4,145,368 $3,531,845Acquisitions, completed construction and tenant improvements601,168 602,836 701,054Disposition of land, buildings, and leasehold interests(50,938) (57,254) (77,219)Provision for loss on impairment of real estate(823) (4,106) (10,312)Balance at the close of year$5,236,251 $4,686,844 $4,145,368Accumulated depreciation and amortization: Balance at the beginning of year$418,136 $333,778 $270,621Disposition of land, buildings, and leasehold interests(9,153) (6,778) (6,980)Depreciation and amortization expense104,192 91,136 70,137Balance at the close of year$513,175 $418,136 $333,778
[2] As of December 31, 2014, the leases are treated as either operating or financing leases for federal income tax purposes. As of December 31, 2014, the aggregate cost of the properties owned by NNN that are under operating leases were $5,119,673 and financing leases were $2,703.
[3] 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.