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Schedule III - Real Estate and Accumulated Depreciation and Amortization Under Operating Leases - Table 9 (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended |  |  |
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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 | $ 5,236,251 us-gaap_RealEstateGrossAtCarryingValue |  | $ 4,686,844 us-gaap_RealEstateGrossAtCarryingValue | $ 4,145,368 us-gaap_RealEstateGrossAtCarryingValue | $ 3,531,845 us-gaap_RealEstateGrossAtCarryingValue
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization | 513,175 us-gaap_RealEstateAccumulatedDepreciation |  | 418,136 us-gaap_RealEstateAccumulatedDepreciation | 333,778 us-gaap_RealEstateAccumulatedDepreciation | 270,621 us-gaap_RealEstateAccumulatedDepreciation
Operating Lease |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |
Real Estate and Accumulated Depreciation, Encumbrances | 26,000 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land | 1,787,519 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests | 2,915,411 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements | 536,524 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember |  |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land | 1,785,779 us-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 | 3,414,698 us-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 | 5,200,477 us-gaap_RealEstateGrossAtCarryingValue / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization | 511,702 us-gaap_RealEstateAccumulatedDepreciation / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember |  |  |  |
Operating Lease | Denny's Provo, UT |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |
Real Estate and Accumulated Depreciation, Encumbrances | 0 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DennysProvoUtMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land | 519 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DennysProvoUtMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests | 216 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DennysProvoUtMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DennysProvoUtMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DennysProvoUtMember |  |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land | 519 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DennysProvoUtMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests | 216 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DennysProvoUtMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests | 735 us-gaap_RealEstateGrossAtCarryingValue / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DennysProvoUtMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization | 90 us-gaap_RealEstateAccumulatedDepreciation / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DennysProvoUtMember |  |  |  |
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed | 20 years |  |  |  |
Operating Lease | Denny's Pueblo, CO |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |
Real Estate and Accumulated Depreciation, Encumbrances | 0 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DennysPuebloCoMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land | 475 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DennysPuebloCoMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests | 302 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DennysPuebloCoMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DennysPuebloCoMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DennysPuebloCoMember |  |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land | 475 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DennysPuebloCoMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests | 302 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DennysPuebloCoMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests | 777 us-gaap_RealEstateGrossAtCarryingValue / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DennysPuebloCoMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization | 125 us-gaap_RealEstateAccumulatedDepreciation / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DennysPuebloCoMember |  |  |  |
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed | 20 years |  |  |  |
Operating Lease | Denny's Raleigh, NC |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |
Real Estate and Accumulated Depreciation, Encumbrances | 0 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DennysRaleighNcMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land | 1,094 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DennysRaleighNcMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests | 482 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DennysRaleighNcMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DennysRaleighNcMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DennysRaleighNcMember |  |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land | 1,094 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DennysRaleighNcMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests | 482 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DennysRaleighNcMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests | 1,576 us-gaap_RealEstateGrossAtCarryingValue / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DennysRaleighNcMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization | 200 us-gaap_RealEstateAccumulatedDepreciation / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DennysRaleighNcMember |  |  |  |
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed | 20 years |  |  |  |
Operating Lease | Denny's St. Louis, MO |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |
Real Estate and Accumulated Depreciation, Encumbrances | 0 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DennysStLouisMo1Member |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land | 520 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DennysStLouisMo1Member |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests | 266 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DennysStLouisMo1Member |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DennysStLouisMo1Member |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DennysStLouisMo1Member |  |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land | 520 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DennysStLouisMo1Member | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests | 266 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DennysStLouisMo1Member | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests | 786 us-gaap_RealEstateGrossAtCarryingValue / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DennysStLouisMo1Member | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization | 110 us-gaap_RealEstateAccumulatedDepreciation / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DennysStLouisMo1Member |  |  |  |
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed | 20 years |  |  |  |
Operating Lease | Denny's Sugarland, TX |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |
Real Estate and Accumulated Depreciation, Encumbrances | 0 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DennysSugarlandTxMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land | 315 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DennysSugarlandTxMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests | 334 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DennysSugarlandTxMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DennysSugarlandTxMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DennysSugarlandTxMember |  |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land | 315 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DennysSugarlandTxMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests | 334 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DennysSugarlandTxMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests | 649 us-gaap_RealEstateGrossAtCarryingValue / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DennysSugarlandTxMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization | 138 us-gaap_RealEstateAccumulatedDepreciation / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DennysSugarlandTxMember |  |  |  |
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed | 20 years |  |  |  |
Operating Lease | Denny's Tacoma, WA |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |
Real Estate and Accumulated Depreciation, Encumbrances | 0 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DennysTacomaWaMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land | 580 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DennysTacomaWaMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests | 201 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DennysTacomaWaMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DennysTacomaWaMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DennysTacomaWaMember |  |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land | 575 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DennysTacomaWaMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests | 201 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DennysTacomaWaMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests | 776 us-gaap_RealEstateGrossAtCarryingValue / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DennysTacomaWaMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization | 83 us-gaap_RealEstateAccumulatedDepreciation / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DennysTacomaWaMember |  |  |  |
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed | 20 years |  |  |  |
Operating Lease | Denny's Tucson, AZ |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |
Real Estate and Accumulated Depreciation, Encumbrances | 0 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DennysTucsonAzMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land | 922 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DennysTucsonAzMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests | 290 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DennysTucsonAzMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DennysTucsonAzMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DennysTucsonAzMember |  |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land | 922 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DennysTucsonAzMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests | 290 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DennysTucsonAzMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests | 1,212 us-gaap_RealEstateGrossAtCarryingValue / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DennysTucsonAzMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization | 120 us-gaap_RealEstateAccumulatedDepreciation / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DennysTucsonAzMember |  |  |  |
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed | 20 years |  |  |  |
Operating Lease | Denny's Wethersfield, CT |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |
Real Estate and Accumulated Depreciation, Encumbrances | 0 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DennysWethersfieldCtMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land | 884 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DennysWethersfieldCtMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests | 176 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DennysWethersfieldCtMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DennysWethersfieldCtMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DennysWethersfieldCtMember |  |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land | 884 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DennysWethersfieldCtMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests | 176 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DennysWethersfieldCtMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests | 1,060 us-gaap_RealEstateGrossAtCarryingValue / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DennysWethersfieldCtMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization | 73 us-gaap_RealEstateAccumulatedDepreciation / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DennysWethersfieldCtMember |  |  |  |
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed | 20 years |  |  |  |
Operating Lease | Denny's Worcester, MA |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |
Real Estate and Accumulated Depreciation, Encumbrances | 0 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DennysWorcesterMaMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land | 383 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DennysWorcesterMaMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests | 493 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DennysWorcesterMaMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DennysWorcesterMaMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DennysWorcesterMaMember |  |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land | 383 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DennysWorcesterMaMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests | 493 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DennysWorcesterMaMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests | 876 us-gaap_RealEstateGrossAtCarryingValue / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DennysWorcesterMaMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization | 204 us-gaap_RealEstateAccumulatedDepreciation / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DennysWorcesterMaMember |  |  |  |
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed | 20 years |  |  |  |
Operating Lease | Denny's Boise, ID |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |
Real Estate and Accumulated Depreciation, Encumbrances | 0 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DennysBoiseIdMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land | 514 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DennysBoiseIdMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests | 477 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DennysBoiseIdMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DennysBoiseIdMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DennysBoiseIdMember |  |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land | 514 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DennysBoiseIdMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests | 477 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DennysBoiseIdMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests | 991 us-gaap_RealEstateGrossAtCarryingValue / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DennysBoiseIdMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization | 192 us-gaap_RealEstateAccumulatedDepreciation / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DennysBoiseIdMember |  |  |  |
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed | 20 years |  |  |  |
Operating Lease | Denny's St. Louis, MO 2 |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |
Real Estate and Accumulated Depreciation, Encumbrances | 0 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DennysStLouisMo2Member |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land | 635 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DennysStLouisMo2Member |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests | 303 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DennysStLouisMo2Member |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DennysStLouisMo2Member |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DennysStLouisMo2Member |  |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land | 635 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DennysStLouisMo2Member | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests | 303 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DennysStLouisMo2Member | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests | 938 us-gaap_RealEstateGrossAtCarryingValue / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DennysStLouisMo2Member | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization | 121 us-gaap_RealEstateAccumulatedDepreciation / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DennysStLouisMo2Member |  |  |  |
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed | 20 years |  |  |  |
Operating Lease | Denny's Virginia Gardens, FL |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |
Real Estate and Accumulated Depreciation, Encumbrances | 0 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DennysVirginiaGardensFlMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land | 793 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DennysVirginiaGardensFlMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests | 133 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DennysVirginiaGardensFlMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DennysVirginiaGardensFlMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DennysVirginiaGardensFlMember |  |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land | 793 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DennysVirginiaGardensFlMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests | 133 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DennysVirginiaGardensFlMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests | 926 us-gaap_RealEstateGrossAtCarryingValue / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DennysVirginiaGardensFlMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization | 53 us-gaap_RealEstateAccumulatedDepreciation / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DennysVirginiaGardensFlMember |  |  |  |
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed | 20 years |  |  |  |
Operating Lease | Denny's Akron, OH |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |
Real Estate and Accumulated Depreciation, Encumbrances | 0 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DennysAkronOHMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land | 308 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DennysAkronOHMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests | 1,062 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DennysAkronOHMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DennysAkronOHMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DennysAkronOHMember |  |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land | 308 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DennysAkronOHMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests | 1,062 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DennysAkronOHMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests | 1,370 us-gaap_RealEstateGrossAtCarryingValue / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DennysAkronOHMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization | 55 us-gaap_RealEstateAccumulatedDepreciation / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DennysAkronOHMember |  |  |  |
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed | 30 years |  |  |  |
Operating Lease | Diamond Communication Lapeer, MI |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |
Real Estate and Accumulated Depreciation, Encumbrances | 0 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DiamondCommunicationLapeerMiMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land | 37 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DiamondCommunicationLapeerMiMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests | 264 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DiamondCommunicationLapeerMiMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DiamondCommunicationLapeerMiMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DiamondCommunicationLapeerMiMember |  |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land | 37 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DiamondCommunicationLapeerMiMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests | 251 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DiamondCommunicationLapeerMiMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests | 288 us-gaap_RealEstateGrossAtCarryingValue / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DiamondCommunicationLapeerMiMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization | 48 us-gaap_RealEstateAccumulatedDepreciation / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DiamondCommunicationLapeerMiMember |  |  |  |
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed | 40 years |  |  |  |
Operating Lease | Dickey's Barbeque Pit Medina, OH |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |
Real Estate and Accumulated Depreciation, Encumbrances | 0 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DickeysBarbequePitMedinaOhMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land | 405 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DickeysBarbequePitMedinaOhMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests | 464 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DickeysBarbequePitMedinaOhMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements | 104 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DickeysBarbequePitMedinaOhMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DickeysBarbequePitMedinaOhMember |  |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land | 405 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DickeysBarbequePitMedinaOhMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests | 568 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DickeysBarbequePitMedinaOhMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests | 973 us-gaap_RealEstateGrossAtCarryingValue / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DickeysBarbequePitMedinaOhMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization | 161 us-gaap_RealEstateAccumulatedDepreciation / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DickeysBarbequePitMedinaOhMember |  |  |  |
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed | 40 years |  |  |  |
Operating Lease | Dick's Sporting Goods Taylor, MI |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |
Real Estate and Accumulated Depreciation, Encumbrances | 0 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DicksSportingGoodsTaylorMiMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land | 1,920 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DicksSportingGoodsTaylorMiMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests | 3,527 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DicksSportingGoodsTaylorMiMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DicksSportingGoodsTaylorMiMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DicksSportingGoodsTaylorMiMember |  |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land | 1,920 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DicksSportingGoodsTaylorMiMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests | 3,527 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DicksSportingGoodsTaylorMiMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests | 5,447 us-gaap_RealEstateGrossAtCarryingValue / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DicksSportingGoodsTaylorMiMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization | 1,613 us-gaap_RealEstateAccumulatedDepreciation / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DicksSportingGoodsTaylorMiMember |  |  |  |
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed | 40 years |  |  |  |
Operating Lease | Dick's Sporting Goods White Marsh, MD |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |
Real Estate and Accumulated Depreciation, Encumbrances | 0 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DicksSportingGoodsWhiteMarshMdMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land | 2,681 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DicksSportingGoodsWhiteMarshMdMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests | 3,917 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DicksSportingGoodsWhiteMarshMdMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DicksSportingGoodsWhiteMarshMdMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DicksSportingGoodsWhiteMarshMdMember |  |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land | 2,681 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DicksSportingGoodsWhiteMarshMdMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests | 3,917 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DicksSportingGoodsWhiteMarshMdMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests | 6,598 us-gaap_RealEstateGrossAtCarryingValue / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DicksSportingGoodsWhiteMarshMdMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization | 1,792 us-gaap_RealEstateAccumulatedDepreciation / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DicksSportingGoodsWhiteMarshMdMember |  |  |  |
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed | 40 years |  |  |  |
Operating Lease | Dollar General San Antonio, TX |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |
Real Estate and Accumulated Depreciation, Encumbrances | 0 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralSanAntonioTXMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land | 441 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralSanAntonioTXMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests | 784 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralSanAntonioTXMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralSanAntonioTXMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralSanAntonioTXMember |  |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land | 441 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralSanAntonioTXMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests | 196 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralSanAntonioTXMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests | 637 us-gaap_RealEstateGrossAtCarryingValue / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralSanAntonioTXMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization | 7 us-gaap_RealEstateAccumulatedDepreciation / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralSanAntonioTXMember |  |  |  |
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed | 30 years |  |  |  |
Operating Lease | Dollar General Memphis, TN |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |
Real Estate and Accumulated Depreciation, Encumbrances | 0 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralMemphisTnMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land | 266 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralMemphisTnMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests | 1,136 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralMemphisTnMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements | 46 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralMemphisTnMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralMemphisTnMember |  |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land | 266 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralMemphisTnMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests | 1,182 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralMemphisTnMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests | 1,448 us-gaap_RealEstateGrossAtCarryingValue / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralMemphisTnMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization | 449 us-gaap_RealEstateAccumulatedDepreciation / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralMemphisTnMember |  |  |  |
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed | 40 years |  |  |  |
Operating Lease | Dollar General High Springs, FL |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |
Real Estate and Accumulated Depreciation, Encumbrances | 0 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralHighSpringsFlMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land | 409 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralHighSpringsFlMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests | 0 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralHighSpringsFlMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements | 1,072 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralHighSpringsFlMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralHighSpringsFlMember |  |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land | 432 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralHighSpringsFlMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests | 1,072 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralHighSpringsFlMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests | 1,504 us-gaap_RealEstateGrossAtCarryingValue / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralHighSpringsFlMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization | 111 us-gaap_RealEstateAccumulatedDepreciation / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralHighSpringsFlMember |  |  |  |
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed | 40 years |  |  |  |
Operating Lease | Dollar General Inverness, FL |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |
Real Estate and Accumulated Depreciation, Encumbrances | 0 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralInvernessFlMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land | 459 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralInvernessFlMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests | 0 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralInvernessFlMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements | 1,046 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralInvernessFlMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralInvernessFlMember |  |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land | 471 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralInvernessFlMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests | 1,046 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralInvernessFlMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests | 1,517 us-gaap_RealEstateGrossAtCarryingValue / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralInvernessFlMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization | 104 us-gaap_RealEstateAccumulatedDepreciation / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralInvernessFlMember |  |  |  |
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed | 40 years |  |  |  |
Operating Lease | Dollar General Cocoa, FL |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |
Real Estate and Accumulated Depreciation, Encumbrances | 0 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralCocoaFlMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land | 385 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralCocoaFlMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests | 0 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralCocoaFlMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements | 935 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralCocoaFlMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralCocoaFlMember |  |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land | 406 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralCocoaFlMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests | 935 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralCocoaFlMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests | 1,341 us-gaap_RealEstateGrossAtCarryingValue / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralCocoaFlMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization | 96 us-gaap_RealEstateAccumulatedDepreciation / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralCocoaFlMember |  |  |  |
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed | 40 years |  |  |  |
Operating Lease | Dollar General Palm Bay, FL |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |
Real Estate and Accumulated Depreciation, Encumbrances | 0 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralPalmBayFlMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land | 355 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralPalmBayFlMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests | 0 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralPalmBayFlMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements | 1,011 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralPalmBayFlMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralPalmBayFlMember |  |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land | 365 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralPalmBayFlMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests | 1,011 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralPalmBayFlMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests | 1,376 us-gaap_RealEstateGrossAtCarryingValue / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralPalmBayFlMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization | 102 us-gaap_RealEstateAccumulatedDepreciation / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralPalmBayFlMember |  |  |  |
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed | 40 years |  |  |  |
Operating Lease | Dollar General Deland, FL |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |
Real Estate and Accumulated Depreciation, Encumbrances | 0 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralDelandFlMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land | 585 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralDelandFlMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests | 0 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralDelandFlMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements | 958 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralDelandFlMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralDelandFlMember |  |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land | 585 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralDelandFlMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests | 958 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralDelandFlMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests | 1,543 us-gaap_RealEstateGrossAtCarryingValue / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralDelandFlMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization | 93 us-gaap_RealEstateAccumulatedDepreciation / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralDelandFlMember |  |  |  |
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed | 40 years |  |  |  |
Operating Lease | Dollar General Seffner, FL |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |
Real Estate and Accumulated Depreciation, Encumbrances | 0 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralSeffnerFlMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land | 673 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralSeffnerFlMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests | 0 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralSeffnerFlMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements | 1,223 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralSeffnerFlMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralSeffnerFlMember |  |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land | 655 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralSeffnerFlMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests | 1,223 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralSeffnerFlMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests | 1,878 us-gaap_RealEstateGrossAtCarryingValue / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralSeffnerFlMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization | 118 us-gaap_RealEstateAccumulatedDepreciation / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralSeffnerFlMember |  |  |  |
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed | 40 years |  |  |  |
Operating Lease | Dollar General Hernando, FL |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |
Real Estate and Accumulated Depreciation, Encumbrances | 0 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralHernandoFlMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land | 372 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralHernandoFlMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests | 0 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralHernandoFlMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements | 970 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralHernandoFlMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralHernandoFlMember |  |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land | 372 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralHernandoFlMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests | 970 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralHernandoFlMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests | 1,342 us-gaap_RealEstateGrossAtCarryingValue / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralHernandoFlMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization | 90 us-gaap_RealEstateAccumulatedDepreciation / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralHernandoFlMember |  |  |  |
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed | 40 years |  |  |  |
Operating Lease | Dollar General Titusville, FL |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |
Real Estate and Accumulated Depreciation, Encumbrances | 0 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralTitusvilleFlMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land | 512 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralTitusvilleFlMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests | 0 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralTitusvilleFlMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements | 1,002 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralTitusvilleFlMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralTitusvilleFlMember |  |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land | 512 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralTitusvilleFlMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests | 1,002 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralTitusvilleFlMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests | 1,514 us-gaap_RealEstateGrossAtCarryingValue / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralTitusvilleFlMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization | 85 us-gaap_RealEstateAccumulatedDepreciation / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralTitusvilleFlMember |  |  |  |
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed | 40 years |  |  |  |
Operating Lease | Dollar General Bunnlevel, NC |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |
Real Estate and Accumulated Depreciation, Encumbrances | 0 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralBunnlevelNcMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land | 106 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralBunnlevelNcMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests | 0 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralBunnlevelNcMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements | 737 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralBunnlevelNcMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralBunnlevelNcMember |  |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land | 106 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralBunnlevelNcMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests | 737 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralBunnlevelNcMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests | 843 us-gaap_RealEstateGrossAtCarryingValue / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralBunnlevelNcMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization | 59 us-gaap_RealEstateAccumulatedDepreciation / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralBunnlevelNcMember |  |  |  |
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed | 40 years |  |  |  |
Operating Lease | Dollar General Disputanta, VA |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |
Real Estate and Accumulated Depreciation, Encumbrances | 0 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralDisputantaVaMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land | 170 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralDisputantaVaMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests | 0 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralDisputantaVaMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements | 720 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralDisputantaVaMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralDisputantaVaMember |  |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land | 170 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralDisputantaVaMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests | 720 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralDisputantaVaMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests | 890 us-gaap_RealEstateGrossAtCarryingValue / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralDisputantaVaMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization | 59 us-gaap_RealEstateAccumulatedDepreciation / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralDisputantaVaMember |  |  |  |
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed | 40 years |  |  |  |
Operating Lease | Dollar General Lumberton, NC |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |
Real Estate and Accumulated Depreciation, Encumbrances | 0 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralLumbertonNcMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land | 115 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralLumbertonNcMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests | 0 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralLumbertonNcMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements | 902 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralLumbertonNcMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralLumbertonNcMember |  |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land | 115 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralLumbertonNcMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests | 902 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralLumbertonNcMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests | 1,017 us-gaap_RealEstateGrossAtCarryingValue / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralLumbertonNcMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization | 67 us-gaap_RealEstateAccumulatedDepreciation / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralLumbertonNcMember |  |  |  |
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed | 40 years |  |  |  |
Operating Lease | Dollar General Newport News, VA |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |
Real Estate and Accumulated Depreciation, Encumbrances | 0 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralNewportNewsVaMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land | 363 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralNewportNewsVaMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests | 0 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralNewportNewsVaMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements | 967 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralNewportNewsVaMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralNewportNewsVaMember |  |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land | 363 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralNewportNewsVaMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests | 967 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralNewportNewsVaMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests | 1,330 us-gaap_RealEstateGrossAtCarryingValue / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralNewportNewsVaMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization | 76 us-gaap_RealEstateAccumulatedDepreciation / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralNewportNewsVaMember |  |  |  |
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed | 40 years |  |  |  |
Operating Lease | Dollar General Cumberland, VA |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |
Real Estate and Accumulated Depreciation, Encumbrances | 0 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralCumberlandVaMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land | 317 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralCumberlandVaMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests | 0 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralCumberlandVaMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements | 1,147 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralCumberlandVaMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralCumberlandVaMember |  |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land | 317 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralCumberlandVaMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests | 1,147 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralCumberlandVaMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests | 1,464 us-gaap_RealEstateGrossAtCarryingValue / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralCumberlandVaMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization | 80 us-gaap_RealEstateAccumulatedDepreciation / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralCumberlandVaMember |  |  |  |
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed | 40 years |  |  |  |
Operating Lease | Dollar General Aberdeen, NC |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |
Real Estate and Accumulated Depreciation, Encumbrances | 0 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralAberdeenNcMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land | 156 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralAberdeenNcMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests | 0 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralAberdeenNcMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements | 821 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralAberdeenNcMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralAberdeenNcMember |  |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land | 156 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralAberdeenNcMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests | 821 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralAberdeenNcMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests | 977 us-gaap_RealEstateGrossAtCarryingValue / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralAberdeenNcMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization | 56 us-gaap_RealEstateAccumulatedDepreciation / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralAberdeenNcMember |  |  |  |
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed | 40 years |  |  |  |
Operating Lease | Dollar General Richmond, VA 1 |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |
Real Estate and Accumulated Depreciation, Encumbrances | 0 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralRichmondVa1Member |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land | 144 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralRichmondVa1Member |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests | 0 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralRichmondVa1Member |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements | 863 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralRichmondVa1Member |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralRichmondVa1Member |  |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land | 144 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralRichmondVa1Member | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests | 863 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralRichmondVa1Member | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests | 1,007 us-gaap_RealEstateGrossAtCarryingValue / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralRichmondVa1Member | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization | 53 us-gaap_RealEstateAccumulatedDepreciation / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralRichmondVa1Member |  |  |  |
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed | 40 years |  |  |  |
Operating Lease | Dollar General Danville, VA |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |
Real Estate and Accumulated Depreciation, Encumbrances | 0 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralDanvilleVaMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land | 155 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralDanvilleVaMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests | 0 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralDanvilleVaMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements | 864 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralDanvilleVaMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralDanvilleVaMember |  |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land | 155 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralDanvilleVaMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests | 864 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralDanvilleVaMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests | 1,019 us-gaap_RealEstateGrossAtCarryingValue / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralDanvilleVaMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization | 57 us-gaap_RealEstateAccumulatedDepreciation / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralDanvilleVaMember |  |  |  |
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed | 40 years |  |  |  |
Operating Lease | Dollar General Cascade, VA |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |
Real Estate and Accumulated Depreciation, Encumbrances | 0 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralCascadeVaMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land | 139 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralCascadeVaMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests | 0 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralCascadeVaMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements | 806 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralCascadeVaMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralCascadeVaMember |  |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land | 139 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralCascadeVaMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests | 806 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralCascadeVaMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests | 945 us-gaap_RealEstateGrossAtCarryingValue / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralCascadeVaMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization | 51 us-gaap_RealEstateAccumulatedDepreciation / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralCascadeVaMember |  |  |  |
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed | 40 years |  |  |  |
Operating Lease | Dollar General Sanford, NC |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |
Real Estate and Accumulated Depreciation, Encumbrances | 0 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralSanfordNcMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land | 147 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralSanfordNcMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests | 0 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralSanfordNcMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements | 834 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralSanfordNcMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralSanfordNcMember |  |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land | 147 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralSanfordNcMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests | 834 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralSanfordNcMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests | 981 us-gaap_RealEstateGrossAtCarryingValue / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralSanfordNcMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization | 50 us-gaap_RealEstateAccumulatedDepreciation / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralSanfordNcMember |  |  |  |
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed | 40 years |  |  |  |
Operating Lease | Dollar General Leland, NC |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |
Real Estate and Accumulated Depreciation, Encumbrances | 0 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralLelandNcMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land | 245 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralLelandNcMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests | 0 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralLelandNcMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements | 892 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralLelandNcMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralLelandNcMember |  |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land | 245 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralLelandNcMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests | 892 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralLelandNcMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests | 1,137 us-gaap_RealEstateGrossAtCarryingValue / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralLelandNcMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization | 49 us-gaap_RealEstateAccumulatedDepreciation / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralLelandNcMember |  |  |  |
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed | 40 years |  |  |  |
Operating Lease | Dollar General Sanford, NC 2 |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |
Real Estate and Accumulated Depreciation, Encumbrances | 0 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralSanfordNc2Member |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land | 206 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralSanfordNc2Member |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests | 0 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralSanfordNc2Member |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements | 829 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralSanfordNc2Member |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralSanfordNc2Member |  |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land | 206 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralSanfordNc2Member | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests | 829 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralSanfordNc2Member | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests | 1,035 us-gaap_RealEstateGrossAtCarryingValue / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralSanfordNc2Member | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization | 46 us-gaap_RealEstateAccumulatedDepreciation / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralSanfordNc2Member |  |  |  |
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed | 40 years |  |  |  |
Operating Lease | Dollar General Richmond, VA 2 |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |
Real Estate and Accumulated Depreciation, Encumbrances | 0 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralRichmondVa2Member |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land | 305 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralRichmondVa2Member |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests | 0 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralRichmondVa2Member |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements | 902 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralRichmondVa2Member |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralRichmondVa2Member |  |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land | 305 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralRichmondVa2Member | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests | 902 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralRichmondVa2Member | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests | 1,207 us-gaap_RealEstateGrossAtCarryingValue / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralRichmondVa2Member | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization | 48 us-gaap_RealEstateAccumulatedDepreciation / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralRichmondVa2Member |  |  |  |
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed | 40 years |  |  |  |
Operating Lease | Dollar General Stead, NV |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |
Real Estate and Accumulated Depreciation, Encumbrances | 0 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralSteadNVMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land | 234 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralSteadNVMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests | 0 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralSteadNVMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements | 1,464 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralSteadNVMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralSteadNVMember |  |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land | 234 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralSteadNVMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests | 1,464 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralSteadNVMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests | 1,698 us-gaap_RealEstateGrossAtCarryingValue / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralSteadNVMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization | 75 us-gaap_RealEstateAccumulatedDepreciation / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralSteadNVMember |  |  |  |
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed | 40 years |  |  |  |
Operating Lease | Dollar General Martinsville, VA |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |
Real Estate and Accumulated Depreciation, Encumbrances | 0 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralMartinsvilleVaMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land | 165 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralMartinsvilleVaMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests | 0 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralMartinsvilleVaMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements | 831 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralMartinsvilleVaMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralMartinsvilleVaMember |  |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land | 165 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralMartinsvilleVaMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests | 831 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralMartinsvilleVaMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests | 996 us-gaap_RealEstateGrossAtCarryingValue / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralMartinsvilleVaMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization | 42 us-gaap_RealEstateAccumulatedDepreciation / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralMartinsvilleVaMember |  |  |  |
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed | 40 years |  |  |  |
Operating Lease | Dollar General Yerington, NV |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |
Real Estate and Accumulated Depreciation, Encumbrances | 0 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralYeringtonNvMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land | 313 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralYeringtonNvMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests | 0 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralYeringtonNvMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements | 1,170 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralYeringtonNvMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralYeringtonNvMember |  |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land | 313 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralYeringtonNvMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests | 1,170 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralYeringtonNvMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests | 1,483 us-gaap_RealEstateGrossAtCarryingValue / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralYeringtonNvMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization | 57 us-gaap_RealEstateAccumulatedDepreciation / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralYeringtonNvMember |  |  |  |
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed | 40 years |  |  |  |
Operating Lease | Dollar General Ridgeway, VA |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |
Real Estate and Accumulated Depreciation, Encumbrances | 0 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralRidgewayVaMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land | 271 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralRidgewayVaMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests | 0 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralRidgewayVaMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements | 935 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralRidgewayVaMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralRidgewayVaMember |  |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land | 271 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralRidgewayVaMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests | 935 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralRidgewayVaMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests | 1,206 us-gaap_RealEstateGrossAtCarryingValue / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralRidgewayVaMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization | 42 us-gaap_RealEstateAccumulatedDepreciation / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralRidgewayVaMember |  |  |  |
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed | 40 years |  |  |  |
Operating Lease | Dollar General Hawthorne, NV |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |
Real Estate and Accumulated Depreciation, Encumbrances | 0 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralHawthorneNvMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land | 210 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralHawthorneNvMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests | 1,069 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralHawthorneNvMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralHawthorneNvMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralHawthorneNvMember |  |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land | 210 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralHawthorneNvMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests | 1,069 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralHawthorneNvMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests | 1,279 us-gaap_RealEstateGrossAtCarryingValue / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralHawthorneNvMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization | 55 us-gaap_RealEstateAccumulatedDepreciation / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralHawthorneNvMember |  |  |  |
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed | 40 years |  |  |  |
Operating Lease | Dollar General Sun Valley, NV |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |
Real Estate and Accumulated Depreciation, Encumbrances | 0 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralSunValleyNVMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land | 439 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralSunValleyNVMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests | 0 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralSunValleyNVMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements | 1,438 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralSunValleyNVMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralSunValleyNVMember |  |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land | 439 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralSunValleyNVMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests | 1,438 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralSunValleyNVMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests | 1,877 us-gaap_RealEstateGrossAtCarryingValue / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralSunValleyNVMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization | 58 us-gaap_RealEstateAccumulatedDepreciation / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralSunValleyNVMember |  |  |  |
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed | 40 years |  |  |  |
Operating Lease | Dollar General Norfolk, VA |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |
Real Estate and Accumulated Depreciation, Encumbrances | 0 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralNorfolkVAMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land | 455 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralNorfolkVAMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests | 0 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralNorfolkVAMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements | 929 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralNorfolkVAMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralNorfolkVAMember |  |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land | 455 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralNorfolkVAMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests | 929 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralNorfolkVAMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests | 1,384 us-gaap_RealEstateGrossAtCarryingValue / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralNorfolkVAMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization | 36 us-gaap_RealEstateAccumulatedDepreciation / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralNorfolkVAMember |  |  |  |
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed | 40 years |  |  |  |
Operating Lease | Dollar General Suffolk, VA 1 |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |
Real Estate and Accumulated Depreciation, Encumbrances | 0 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralSuffolkVAMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land | 186 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralSuffolkVAMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests | 0 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralSuffolkVAMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements | 958 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralSuffolkVAMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralSuffolkVAMember |  |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land | 186 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralSuffolkVAMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests | 958 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralSuffolkVAMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests | 1,144 us-gaap_RealEstateGrossAtCarryingValue / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralSuffolkVAMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization | 37 us-gaap_RealEstateAccumulatedDepreciation / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralSuffolkVAMember |  |  |  |
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed | 40 years |  |  |  |
Operating Lease | Dollar General Suffolk, VA 2 |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |
Real Estate and Accumulated Depreciation, Encumbrances | 0 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralSuffolkVA2Member |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land | 128 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralSuffolkVA2Member |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests | 0 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralSuffolkVA2Member |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements | 1,010 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralSuffolkVA2Member |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralSuffolkVA2Member |  |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land | 128 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralSuffolkVA2Member | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests | 1,010 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralSuffolkVA2Member | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests | 1,138 us-gaap_RealEstateGrossAtCarryingValue / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralSuffolkVA2Member | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization | 35 us-gaap_RealEstateAccumulatedDepreciation / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralSuffolkVA2Member |  |  |  |
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed | 40 years |  |  |  |
Operating Lease | Dollar General Irving, NY |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |
Real Estate and Accumulated Depreciation, Encumbrances | 0 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralIrvingNYMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land | 210 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralIrvingNYMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests | 0 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralIrvingNYMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements | 961 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralIrvingNYMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralIrvingNYMember |  |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land | 210 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralIrvingNYMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests | 961 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralIrvingNYMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests | 1,171 us-gaap_RealEstateGrossAtCarryingValue / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralIrvingNYMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization | 29 us-gaap_RealEstateAccumulatedDepreciation / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralIrvingNYMember |  |  |  |
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed | 40 years |  |  |  |
Operating Lease | Dollar General Oakfield, NY |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |
Real Estate and Accumulated Depreciation, Encumbrances | 0 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralOakfieldNYMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land | 257 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralOakfieldNYMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests | 0 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralOakfieldNYMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements | 1,108 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralOakfieldNYMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralOakfieldNYMember |  |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land | 271 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralOakfieldNYMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests | 1,108 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralOakfieldNYMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests | 1,379 us-gaap_RealEstateGrossAtCarryingValue / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralOakfieldNYMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization | 20 us-gaap_RealEstateAccumulatedDepreciation / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralOakfieldNYMember |  |  |  |
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed | 40 years |  |  |  |
Operating Lease | Dollar General Holland, NY |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |
Real Estate and Accumulated Depreciation, Encumbrances | 0 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralHollandNYMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land | 176 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralHollandNYMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests | 0 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralHollandNYMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements | 1,103 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralHollandNYMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralHollandNYMember |  |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land | 176 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralHollandNYMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests | 1,103 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralHollandNYMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests | 1,279 us-gaap_RealEstateGrossAtCarryingValue / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralHollandNYMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization | 13 us-gaap_RealEstateAccumulatedDepreciation / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralHollandNYMember |  |  |  |
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed | 40 years |  |  |  |
Operating Lease | Dollar General Jeffersonville, IN |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |
Real Estate and Accumulated Depreciation, Encumbrances | 0 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralJeffersonvilleINMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land | 115 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralJeffersonvilleINMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests | 960 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralJeffersonvilleINMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralJeffersonvilleINMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralJeffersonvilleINMember |  |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land | 115 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralJeffersonvilleINMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests | 960 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralJeffersonvilleINMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests | 1,075 us-gaap_RealEstateGrossAtCarryingValue / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralJeffersonvilleINMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization | 24 us-gaap_RealEstateAccumulatedDepreciation / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralJeffersonvilleINMember |  |  |  |
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed | 35 years |  |  |  |
Operating Lease | Dollar General LaFayette, LA |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |
Real Estate and Accumulated Depreciation, Encumbrances | 0 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralLaFayetteLAMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land | 157 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralLaFayetteLAMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests | 378 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralLaFayetteLAMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralLaFayetteLAMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralLaFayetteLAMember |  |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land | 157 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralLaFayetteLAMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests | 378 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralLaFayetteLAMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests | 535 us-gaap_RealEstateGrossAtCarryingValue / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralLaFayetteLAMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization | 7 us-gaap_RealEstateAccumulatedDepreciation / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralLaFayetteLAMember |  |  |  |
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed | 25 years |  |  |  |
Operating Lease | Dollar General Youngsville, LA |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |
Real Estate and Accumulated Depreciation, Encumbrances | 0 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralYoungsvilleLAMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land | 98 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralYoungsvilleLAMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests | 370 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralYoungsvilleLAMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralYoungsvilleLAMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralYoungsvilleLAMember |  |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land | 98 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralYoungsvilleLAMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests | 370 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralYoungsvilleLAMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests | 468 us-gaap_RealEstateGrossAtCarryingValue / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralYoungsvilleLAMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization | 7 us-gaap_RealEstateAccumulatedDepreciation / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarGeneralYoungsvilleLAMember |  |  |  |
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed | 25 years |  |  |  |
Operating Lease | Dollar Tree Garland, TX |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |
Real Estate and Accumulated Depreciation, Encumbrances | 0 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarTreeGarlandTxMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land | 239 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarTreeGarlandTxMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests | 626 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarTreeGarlandTxMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarTreeGarlandTxMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarTreeGarlandTxMember |  |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land | 239 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarTreeGarlandTxMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests | 626 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarTreeGarlandTxMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests | 865 us-gaap_RealEstateGrossAtCarryingValue / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarTreeGarlandTxMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization | 211 us-gaap_RealEstateAccumulatedDepreciation / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarTreeGarlandTxMember |  |  |  |
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed | 40 years |  |  |  |
Operating Lease | Dollar Tree Copperas Cove, TX |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |
Real Estate and Accumulated Depreciation, Encumbrances | 0 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarTreeCopperasCoveTxMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land | 242 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarTreeCopperasCoveTxMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests | 512 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarTreeCopperasCoveTxMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements | 194 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarTreeCopperasCoveTxMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarTreeCopperasCoveTxMember |  |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land | 242 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarTreeCopperasCoveTxMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests | 706 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarTreeCopperasCoveTxMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests | 948 us-gaap_RealEstateGrossAtCarryingValue / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarTreeCopperasCoveTxMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization | 272 us-gaap_RealEstateAccumulatedDepreciation / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarTreeCopperasCoveTxMember |  |  |  |
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed | 40 years |  |  |  |
Operating Lease | Dollar Tree Marietta, GA |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |
Real Estate and Accumulated Depreciation, Encumbrances | 0 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarTreeMariettaGAMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land | 525 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarTreeMariettaGAMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests | 0 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarTreeMariettaGAMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarTreeMariettaGAMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarTreeMariettaGAMember |  |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land | 525 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarTreeMariettaGAMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests | 525 us-gaap_RealEstateGrossAtCarryingValue / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DollarTreeMariettaGAMember | [1],[2] |  |  |
Operating Lease | Don Tello's Tex-Mex Grill Lithonia, GA |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |
Real Estate and Accumulated Depreciation, Encumbrances | 0 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DonTellosTexMexGrillLithoniaGaMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land | 923 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DonTellosTexMexGrillLithoniaGaMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests | 1,276 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DonTellosTexMexGrillLithoniaGaMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements | 16 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DonTellosTexMexGrillLithoniaGaMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DonTellosTexMexGrillLithoniaGaMember |  |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land | 923 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DonTellosTexMexGrillLithoniaGaMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests | 1,293 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DonTellosTexMexGrillLithoniaGaMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests | 2,216 us-gaap_RealEstateGrossAtCarryingValue / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DonTellosTexMexGrillLithoniaGaMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization | 241 us-gaap_RealEstateAccumulatedDepreciation / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DonTellosTexMexGrillLithoniaGaMember |  |  |  |
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed | 40 years |  |  |  |
Operating Lease | Dr. Clean Dry Cleaners Monticello, NY |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |
Real Estate and Accumulated Depreciation, Encumbrances | 0 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DrCleanDryCleanersMonticelloNyMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land | 20 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DrCleanDryCleanersMonticelloNyMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests | 72 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DrCleanDryCleanersMonticelloNyMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DrCleanDryCleanersMonticelloNyMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DrCleanDryCleanersMonticelloNyMember |  |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land | 20 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DrCleanDryCleanersMonticelloNyMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests | 72 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DrCleanDryCleanersMonticelloNyMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests | 92 us-gaap_RealEstateGrossAtCarryingValue / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DrCleanDryCleanersMonticelloNyMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization | 18 us-gaap_RealEstateAccumulatedDepreciation / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_DrCleanDryCleanersMonticelloNyMember |  |  |  |
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed | 40 years |  |  |  |
Operating Lease | Eagle Tax Center Hollywood, FL |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |
Real Estate and Accumulated Depreciation, Encumbrances | 0 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_EagleTaxCenterHollywoodFLMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land | 203 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_EagleTaxCenterHollywoodFLMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests | 46 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_EagleTaxCenterHollywoodFLMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements | 19 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_EagleTaxCenterHollywoodFLMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_EagleTaxCenterHollywoodFLMember |  |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land | 124 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_EagleTaxCenterHollywoodFLMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests | 0 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_EagleTaxCenterHollywoodFLMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests | 124 us-gaap_RealEstateGrossAtCarryingValue / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_EagleTaxCenterHollywoodFLMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization | 0 us-gaap_RealEstateAccumulatedDepreciation / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_EagleTaxCenterHollywoodFLMember |  |  |  |
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed | 15 years |  |  |  |
Operating Lease | Ecotech Institute Aurora, CO |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |
Real Estate and Accumulated Depreciation, Encumbrances | 0 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_EcotechInstituteAuroraCoMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land | 5,076 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_EcotechInstituteAuroraCoMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests | 13,874 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_EcotechInstituteAuroraCoMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements | 5,663 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_EcotechInstituteAuroraCoMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_EcotechInstituteAuroraCoMember |  |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land | 5,041 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_EcotechInstituteAuroraCoMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests | 19,537 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_EcotechInstituteAuroraCoMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests | 24,578 us-gaap_RealEstateGrossAtCarryingValue / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_EcotechInstituteAuroraCoMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization | 3,292 us-gaap_RealEstateAccumulatedDepreciation / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_EcotechInstituteAuroraCoMember |  |  |  |
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed | 40 years |  |  |  |
Operating Lease | Ecotech Institute Austin, TX |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |
Real Estate and Accumulated Depreciation, Encumbrances | 0 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_EcotechInstituteAustinTxMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land | 2,291 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_EcotechInstituteAustinTxMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests | 1,770 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_EcotechInstituteAustinTxMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements | 4,999 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_EcotechInstituteAustinTxMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_EcotechInstituteAustinTxMember |  |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land | 2,291 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_EcotechInstituteAustinTxMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests | 6,769 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_EcotechInstituteAustinTxMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests | 9,060 us-gaap_RealEstateGrossAtCarryingValue / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_EcotechInstituteAustinTxMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization | 460 us-gaap_RealEstateAccumulatedDepreciation / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_EcotechInstituteAustinTxMember |  |  |  |
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed | 35 years |  |  |  |
Operating Lease | Empire Buffet Las Cruces, NM |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |
Real Estate and Accumulated Depreciation, Encumbrances | 0 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_EmpireBuffetLasCrucesNMMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land | 947 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_EmpireBuffetLasCrucesNMMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests | 0 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_EmpireBuffetLasCrucesNMMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements | 2,286 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_EmpireBuffetLasCrucesNMMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_EmpireBuffetLasCrucesNMMember |  |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land | 947 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_EmpireBuffetLasCrucesNMMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests | 2,286 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_EmpireBuffetLasCrucesNMMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests | 3,233 us-gaap_RealEstateGrossAtCarryingValue / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_EmpireBuffetLasCrucesNMMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization | 461 us-gaap_RealEstateAccumulatedDepreciation / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_EmpireBuffetLasCrucesNMMember |  |  |  |
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed | 40 years |  |  |  |
Operating Lease | Encore at Crosswoods Columbus, OH |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |
Real Estate and Accumulated Depreciation, Encumbrances | 0 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_EncoreAtCrosswoodsColumbusOhMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land | 1,032 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_EncoreAtCrosswoodsColumbusOhMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests | 1,107 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_EncoreAtCrosswoodsColumbusOhMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_EncoreAtCrosswoodsColumbusOhMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_EncoreAtCrosswoodsColumbusOhMember |  |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land | 1,032 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_EncoreAtCrosswoodsColumbusOhMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests | 1,107 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_EncoreAtCrosswoodsColumbusOhMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests | 2,139 us-gaap_RealEstateGrossAtCarryingValue / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_EncoreAtCrosswoodsColumbusOhMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization | 361 us-gaap_RealEstateAccumulatedDepreciation / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_EncoreAtCrosswoodsColumbusOhMember |  |  |  |
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed | 40 years |  |  |  |
Operating Lease | Express Mart Thomasville, NC |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |
Real Estate and Accumulated Depreciation, Encumbrances | 0 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_ExpressMartThomasvilleNCMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land | 140 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_ExpressMartThomasvilleNCMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests | 228 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_ExpressMartThomasvilleNCMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_ExpressMartThomasvilleNCMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_ExpressMartThomasvilleNCMember |  |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land | 140 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_ExpressMartThomasvilleNCMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests | 228 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_ExpressMartThomasvilleNCMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests | 368 us-gaap_RealEstateGrossAtCarryingValue / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_ExpressMartThomasvilleNCMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization | 5 us-gaap_RealEstateAccumulatedDepreciation / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_ExpressMartThomasvilleNCMember |  |  |  |
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed | 20 years |  |  |  |
Operating Lease | Express Oil Change Birmingham, AL |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |
Real Estate and Accumulated Depreciation, Encumbrances | 0 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_ExpressOilChangeBirminghamAlMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land | 470 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_ExpressOilChangeBirminghamAlMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests | 695 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_ExpressOilChangeBirminghamAlMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_ExpressOilChangeBirminghamAlMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_ExpressOilChangeBirminghamAlMember |  |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land | 470 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_ExpressOilChangeBirminghamAlMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests | 695 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_ExpressOilChangeBirminghamAlMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests | 1,165 us-gaap_RealEstateGrossAtCarryingValue / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_ExpressOilChangeBirminghamAlMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization | 118 us-gaap_RealEstateAccumulatedDepreciation / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_ExpressOilChangeBirminghamAlMember |  |  |  |
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed | 40 years |  |  |  |
Operating Lease | Express Oil Change Florence, AL |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |
Real Estate and Accumulated Depreciation, Encumbrances | 0 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_ExpressOilChangeFlorenceAlMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land | 110 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_ExpressOilChangeFlorenceAlMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests | 381 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_ExpressOilChangeFlorenceAlMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_ExpressOilChangeFlorenceAlMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_ExpressOilChangeFlorenceAlMember |  |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land | 110 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_ExpressOilChangeFlorenceAlMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests | 381 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_ExpressOilChangeFlorenceAlMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests | 491 us-gaap_RealEstateGrossAtCarryingValue / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_ExpressOilChangeFlorenceAlMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization | 87 us-gaap_RealEstateAccumulatedDepreciation / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_ExpressOilChangeFlorenceAlMember |  |  |  |
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed | 30 years |  |  |  |
Operating Lease | Express Oil Change Helena, AL |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |
Real Estate and Accumulated Depreciation, Encumbrances | 0 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_ExpressOilChangeHelenaAlMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land | 363 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_ExpressOilChangeHelenaAlMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests | 628 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_ExpressOilChangeHelenaAlMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_ExpressOilChangeHelenaAlMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_ExpressOilChangeHelenaAlMember |  |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land | 363 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_ExpressOilChangeHelenaAlMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests | 628 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_ExpressOilChangeHelenaAlMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests | 991 us-gaap_RealEstateGrossAtCarryingValue / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_ExpressOilChangeHelenaAlMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization | 108 us-gaap_RealEstateAccumulatedDepreciation / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_ExpressOilChangeHelenaAlMember |  |  |  |
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed | 40 years |  |  |  |
Operating Lease | Express Oil Change Muscle Shoals, AL |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |
Real Estate and Accumulated Depreciation, Encumbrances | 0 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_ExpressOilChangeMuscleShoalsAlMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land | 168 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_ExpressOilChangeMuscleShoalsAlMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests | 624 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_ExpressOilChangeMuscleShoalsAlMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_ExpressOilChangeMuscleShoalsAlMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_ExpressOilChangeMuscleShoalsAlMember |  |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land | 168 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_ExpressOilChangeMuscleShoalsAlMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests | 624 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_ExpressOilChangeMuscleShoalsAlMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests | 792 us-gaap_RealEstateGrossAtCarryingValue / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_ExpressOilChangeMuscleShoalsAlMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization | 143 us-gaap_RealEstateAccumulatedDepreciation / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_ExpressOilChangeMuscleShoalsAlMember |  |  |  |
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed | 30 years |  |  |  |
Operating Lease | Express Oil Change Opelika, AL |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |
Real Estate and Accumulated Depreciation, Encumbrances | 0 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_ExpressOilChangeOpelikaAlMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land | 547 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_ExpressOilChangeOpelikaAlMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests | 680 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_ExpressOilChangeOpelikaAlMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_ExpressOilChangeOpelikaAlMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_ExpressOilChangeOpelikaAlMember |  |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land | 547 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_ExpressOilChangeOpelikaAlMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests | 680 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_ExpressOilChangeOpelikaAlMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests | 1,227 us-gaap_RealEstateGrossAtCarryingValue / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_ExpressOilChangeOpelikaAlMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization | 117 us-gaap_RealEstateAccumulatedDepreciation / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_ExpressOilChangeOpelikaAlMember |  |  |  |
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed | 40 years |  |  |  |
Operating Lease | Express Oil Change Cordova, TN |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |
Real Estate and Accumulated Depreciation, Encumbrances | 0 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_ExpressOilChangeCordovaTnMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land | 639 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_ExpressOilChangeCordovaTnMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests | 785 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_ExpressOilChangeCordovaTnMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_ExpressOilChangeCordovaTnMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_ExpressOilChangeCordovaTnMember |  |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land | 639 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_ExpressOilChangeCordovaTnMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests | 785 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_ExpressOilChangeCordovaTnMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests | 1,424 us-gaap_RealEstateGrossAtCarryingValue / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_ExpressOilChangeCordovaTnMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization | 119 us-gaap_RealEstateAccumulatedDepreciation / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_ExpressOilChangeCordovaTnMember |  |  |  |
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed | 40 years |  |  |  |
Operating Lease | Express Oil Change Horn Lake, MS |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |
Real Estate and Accumulated Depreciation, Encumbrances | 0 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_ExpressOilChangeHornLakeMsMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land | 326 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_ExpressOilChangeHornLakeMsMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests | 611 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_ExpressOilChangeHornLakeMsMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_ExpressOilChangeHornLakeMsMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_ExpressOilChangeHornLakeMsMember |  |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land | 326 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_ExpressOilChangeHornLakeMsMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests | 611 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_ExpressOilChangeHornLakeMsMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests | 937 us-gaap_RealEstateGrossAtCarryingValue / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_ExpressOilChangeHornLakeMsMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization | 105 us-gaap_RealEstateAccumulatedDepreciation / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_ExpressOilChangeHornLakeMsMember |  |  |  |
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed | 35 years |  |  |  |
Operating Lease | Express Oil Change Lakeland, TN |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |
Real Estate and Accumulated Depreciation, Encumbrances | 0 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_ExpressOilChangeLakelandTnMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land | 186 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_ExpressOilChangeLakelandTnMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests | 489 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_ExpressOilChangeLakelandTnMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_ExpressOilChangeLakelandTnMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_ExpressOilChangeLakelandTnMember |  |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land | 186 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_ExpressOilChangeLakelandTnMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests | 489 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_ExpressOilChangeLakelandTnMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests | 675 us-gaap_RealEstateGrossAtCarryingValue / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_ExpressOilChangeLakelandTnMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization | 74 us-gaap_RealEstateAccumulatedDepreciation / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_ExpressOilChangeLakelandTnMember |  |  |  |
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed | 40 years |  |  |  |
Operating Lease | Express Oil Change Memphis, TN |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |
Real Estate and Accumulated Depreciation, Encumbrances | 0 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_ExpressOilChangeMemphisTnMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land | 402 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_ExpressOilChangeMemphisTnMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests | 721 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_ExpressOilChangeMemphisTnMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_ExpressOilChangeMemphisTnMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_ExpressOilChangeMemphisTnMember |  |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land | 402 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_ExpressOilChangeMemphisTnMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests | 721 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_ExpressOilChangeMemphisTnMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests | 1,123 us-gaap_RealEstateGrossAtCarryingValue / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_ExpressOilChangeMemphisTnMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization | 109 us-gaap_RealEstateAccumulatedDepreciation / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_ExpressOilChangeMemphisTnMember |  |  |  |
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed | 40 years |  |  |  |
Operating Lease | Express Oil Change Houston, TX |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |
Real Estate and Accumulated Depreciation, Encumbrances | 0 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_ExpressOilChangeHoustonTxMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land | 651 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_ExpressOilChangeHoustonTxMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests | 0 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_ExpressOilChangeHoustonTxMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements | 648 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_ExpressOilChangeHoustonTxMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_ExpressOilChangeHoustonTxMember |  |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land | 543 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_ExpressOilChangeHoustonTxMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests | 648 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_ExpressOilChangeHoustonTxMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests | 1,191 us-gaap_RealEstateGrossAtCarryingValue / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_ExpressOilChangeHoustonTxMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization | 40 us-gaap_RealEstateAccumulatedDepreciation / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_ExpressOilChangeHoustonTxMember |  |  |  |
Real Estate and Accumulated Depreciation, Life on Which Depreciation & Amortization in Latest Income Statement is Computed | 40 years |  |  |  |
Operating Lease | Express Oil Change Katy, TX |  |  |  |  |
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items] |  |  |  |  |
Real Estate and Accumulated Depreciation, Encumbrances | 0 us-gaap_RealEstateAndAccumulatedDepreciationAmountOfEncumbrances / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_ExpressOilChangeKatyTxMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Land | 539 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_ExpressOilChangeKatyTxMember |  |  |  |
Real Estate and Accumulated Depreciation, Initial Cost to Company, Building, Improvements & Leasehold Interests | 0 us-gaap_RealEstateAndAccumulatedDepreciationInitialCostOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_ExpressOilChangeKatyTxMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements | 830 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_ExpressOilChangeKatyTxMember |  |  |  |
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Carrying Costs | 0 us-gaap_RealEstateAndAccumulatedDepreciationCostsCapitalizedSubsequentToAcquisitionCarryingCosts / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_ExpressOilChangeKatyTxMember |  |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land | 539 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfLand / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_ExpressOilChangeKatyTxMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Building, Improvements & Leasehold Interests | 829 us-gaap_RealEstateAndAccumulatedDepreciationCarryingAmountOfBuildingsAndImprovements / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_ExpressOilChangeKatyTxMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Gross Amount at Which Carried at Close of Period, Land, Building, Improvements & Leasehold Interests | 1,368 us-gaap_RealEstateGrossAtCarryingValue / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_ExpressOilChangeKatyTxMember | [1],[2] |  |  |
Real Estate and Accumulated Depreciation, Accumulated Depreciation and Amortization | $ 42 us-gaap_RealEstateAccumulatedDepreciation / nnn_ClassificationOfInvestmentPropertyLeasesByTypeOfLeaseAxis = nnn_OperatingLeaseMember / us-gaap_RealEstateAndAccumulatedDepreciationDescriptionOfPropertyAxis = nnn_ExpressOilChangeKatyTxMember |  |  |  |
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.

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