75000 - Document - Cover link:presentationLink link:calculationLink link:definitionLink 75010 - Statement - Condensed Consolidated Balance Sheets link:presentationLink link:calculationLink link:definitionLink 75020 - Statement - Condensed Consolidated Balance Sheets (Parenthetical) link:presentationLink link:calculationLink link:definitionLink 75030 - Statement - Condensed Consolidated Statements of Income and Comprehensive Income (Unaudited) link:presentationLink link:calculationLink link:definitionLink 75040 - Statement - Condensed Consolidated Statements of Income and Comprehensive Income (Unaudited) 3 link:presentationLink link:calculationLink link:definitionLink 75050 - Statement - Condensed Consolidated Statements of Equity (Unaudited) link:presentationLink link:calculationLink link:definitionLink 75060 - Statement - Condensed Consolidated Statements of Equity (Unaudited) (Parenthetical) link:presentationLink link:calculationLink link:definitionLink 75070 - Statement - Condensed Consolidated Statements of Cash Flows (Unaudited) link:presentationLink link:calculationLink link:definitionLink 75080 - Statement - Condensed Consolidated Statements of Cash Flows (Unaudited) (Parenthetical) link:presentationLink link:calculationLink link:definitionLink 995455 - Disclosure - Organization and Summary of Significant Accounting Policies link:presentationLink link:calculationLink link:definitionLink 995465 - Disclosure - Real Estate link:presentationLink link:calculationLink link:definitionLink 995475 - Disclosure - Line of Credit Payable link:presentationLink link:calculationLink link:definitionLink 995485 - Disclosure - Term Loan link:presentationLink link:calculationLink link:definitionLink 995495 - Disclosure - Notes Payable link:presentationLink link:calculationLink link:definitionLink 995505 - Disclosure - Stockholders' Equity link:presentationLink link:calculationLink link:definitionLink 995515 - Disclosure - Derivatives link:presentationLink link:calculationLink link:definitionLink 995525 - Disclosure - Fair Value of Financial Instruments link:presentationLink link:calculationLink link:definitionLink 995535 - Disclosure - Segment Information link:presentationLink link:calculationLink link:definitionLink 995545 - Disclosure - Notes Payable and Derivatives link:presentationLink link:calculationLink link:definitionLink 995555 - Disclosure - Subsequent Events link:presentationLink link:calculationLink link:definitionLink 995565 - Disclosure - Organization and Summary of Significant Accounting Policies (Policies) link:presentationLink link:calculationLink link:definitionLink 995575 - Disclosure - Organization and Summary of Significant Accounting Policies (Tables) link:presentationLink link:calculationLink link:definitionLink 995585 - Disclosure - Real Estate (Tables) link:presentationLink link:calculationLink link:definitionLink 995595 - Disclosure - Notes Payable (Tables) link:presentationLink link:calculationLink link:definitionLink 995605 - Disclosure - Derivatives (Tables) link:presentationLink link:calculationLink link:definitionLink 995615 - Disclosure - Stockholders' Equity (Tables) link:presentationLink link:calculationLink link:definitionLink 995625 - Disclosure - Organization and Summary of Significant Accounting Policies (Summary of NNN's Investment Portfolio) (Details) link:presentationLink link:calculationLink link:definitionLink 995635 - Disclosure - Organization and Summary of Significant Accounting Policies - (Summary of tenants classified as cash basis) (Details) link:presentationLink link:calculationLink link:definitionLink 995645 - Disclosure - Organization and Summary of Significant Accounting Policies - (Summary of tenants classified as cash basis) (Parenthetical) (Details) link:presentationLink link:calculationLink link:definitionLink 995655 - Disclosure - Organization and Summary of Significant Accounting Policies (Computation of Basic and Diluted Earnings per Share) (Details) link:presentationLink link:calculationLink link:definitionLink 995665 - Disclosure - Organization and Summary of Significant Accounting Policies (Changes in AOCI) (Details) link:presentationLink link:calculationLink link:definitionLink 995675 - Disclosure - Organization and Summary of Significant Accounting Policies (Narrative) (Details) link:presentationLink link:calculationLink link:definitionLink 995685 - Disclosure - Real Estate (Key Information for Leases) (Details) link:presentationLink link:calculationLink link:definitionLink 995695 - Disclosure - Real Estate (Summary of Real Estate Subject to Operating Leases) (Details) link:presentationLink link:calculationLink link:definitionLink 995705 - Disclosure - Real Estate (Rental Income) (Details) link:presentationLink link:calculationLink link:definitionLink 995715 - Disclosure - Real Estate (Intangible Assets and Liabilities) (Details) link:presentationLink link:calculationLink link:definitionLink 995725 - Disclosure - Real Estate (Dispositions) (Details) link:presentationLink link:calculationLink link:definitionLink 995735 - Disclosure - Real Estate (Commitments) (Details) link:presentationLink link:calculationLink link:definitionLink 995745 - Disclosure - Real Estate (Commitments) (Details) 2 link:presentationLink link:calculationLink link:definitionLink 995755 - Schedule - Real Estate (Impairments) (Details) link:presentationLink link:calculationLink link:definitionLink 995765 - Disclosure - Line of Credit Payable (Details) link:presentationLink link:calculationLink link:definitionLink 995775 - Disclosure - Term Loan (Additional Information) (Details) link:presentationLink link:calculationLink link:definitionLink 995785 - Disclosure - Notes Payable (Additional Information) (Details) link:presentationLink link:calculationLink link:definitionLink 995795 - Disclosure - Stockholders' Equity - Schedule of outlines of ATM Program (Details) link:presentationLink link:calculationLink link:definitionLink 995805 - Disclosure - Stockholders' Equity - Schedule of Common Stock Issuances Pursuant to NNN's ATM (Details) link:presentationLink link:calculationLink link:definitionLink 995815 - Disclosure - Stockholders' Equity - Schedule of Common Stock Issuances Pursuant to NNN's ATM (Parenthetical) (Details) link:presentationLink link:calculationLink link:definitionLink 995825 - Disclosure - Stockholders' Equity (Additional Information) (Details) link:presentationLink link:calculationLink link:definitionLink 995835 - Disclosure - Stockholders' Equity - Schedule of common stock issuances pursuant to DRIP (Details) link:presentationLink link:calculationLink link:definitionLink 995845 - Disclosure - Stockholders' Equity - Schedule of Dividends Declared and Paid (Details) link:presentationLink link:calculationLink link:definitionLink 995855 - Disclosure - Derivatives - Summary of Interest Rate Derivatives Designated as Cash Flow Hedges (Details) link:presentationLink link:calculationLink link:definitionLink 995865 - Disclosure - Derivatives (Additional Information) (Details) link:presentationLink link:calculationLink link:definitionLink 995875 - Disclosure - Fair Value of Financial Instruments (Details) link:presentationLink link:calculationLink link:definitionLink 995885 - Disclosure - Segment information (Additional Information) (Details) link:presentationLink link:calculationLink link:definitionLink 995895 - Disclosure - Subsequent Events (Additional Information) (Details) link:presentationLink link:calculationLink link:definitionLink Increase (Decrease) in Interest Payable, Net Increase (decrease) in accrued interest payable Restricted Cash and Investments, Restricted Cash and Cash Held in Escrow, Current Restricted Cash and Investments, Restricted Cash and Cash Held in Escrow, Current Restricted cash and cash held in escrow Above-market and below-market in-place leases Above Market And Below Market Leases [Member] Above Market And Below Market Leases [Member] Above-Market and Below-Market In-Place Lease Intangibles Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Supplemental disclosure of noncash investing and financing activities: Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] Equity [Abstract] Equity [Abstract] Entity Current Reporting Status Entity Current Reporting Status Class of Financing Receivable [Axis] Class of Financing Receivable [Axis] Operating expenses: Operating Expenses [Abstract] Fair Value, Inputs, Level 2 [Member] Level 2 2023 ATM ATMEquityProgramTwoThousandTwentyThree [Member] ATMEquityProgramTwoThousandTwentyThree [Member] Common stock, shares authorized (in shares) Common Stock, Shares Authorized Total allowable shares Document Fiscal Period Focus Document Fiscal Period Focus Debt Instrument, Interest Rate, Stated Percentage Debt interest rate percantage Entity Shell Company Entity Shell Company Other dilutive securities Incremental Common Shares Attributable To Dilutive Effect, Other Incremental Common Shares Attributable To Dilutive Effect, Other Dividends, Common Stock, Cash Common stock dividends declared and paid Common stock dividends declared and paid Cash and cash equivalents Cash and Cash Equivalent Cash and Cash Equivalents, at Carrying Value, Total Cash and Cash Equivalents, at Carrying Value, Beginning Balance Cash and Cash Equivalents, at Carrying Value, Ending Balance Basic and Diluted Weighted Average Shares Outstanding: Weighted Average Number of Shares Outstanding Reconciliation [Abstract] Common stock, shares issued (in shares) Common Stock, Shares, Issued Common Stock, Shares, Issued, Total Total shares issued Statement [Table] Statement [Table] Direct Financing Lease, Lease Income Earned income from direct financing leases Direct Financing Lease, Lease Income, Total Increase (Decrease) in Receivables Increase (Decrease) in Receivables, Total Decrease in receivables Offsetting Assets [Table] Statement [Line Items] Statement [Line Items] Entity Filer Category Entity Filer Category Lease Income Recognized On Cash Basis Percentage Of Total Annual Base Rent Lease Income Recognized On Cash Basis Percentage Of Total Annual Base Rent % of Annualized Base Rent ("ABR") Estimated Fair Value Cash Flow Hedges Derivative Instruments at Fair Value, Net Cash Flow Hedges Derivative Instruments at Fair Value, Net, Total Carrying value of outstanding derivative financial instruments Total liabilities and equity Liabilities and Equity Property, Plant and Equipment, Type [Axis] Long-Lived Tangible Asset [Axis] Buildings and improvements Investment Building and Building Improvements Investment Building and Building Improvements, Total Real Estate Property, Ownership [Table] Financial Instruments Disclosure [Text Block] Fair Value of Financial Instruments Derivative [Line Items] Derivative [Line Items] Subsequent Event [Line Items] Restricted Cash and Cash Held in Escrow Cash and Cash Equivalents, Restricted Cash and Cash Equivalents, Policy [Policy Text Block] Real estate held for sale Real estate held for sale Inventory, Real Estate, Held-for-Sale Debt Instrument, Interest Rate During Period Debt Instrument Interest Rate Investment Maturity Date Maturity Date Remaining Funding Commitments Schedule Of Real Estate Investment Portfolio Remaining Funding Commitments [Table Text Block] Schedule Of Real Estate Investment Portfolio Remaining Funding Commitments [Table Text Block] Stock Issued During Period, Value, Dividend Reinvestment Plan Common stock dividends declared and paid Common stock dividends declared and paid Initial lease term Lessor, Lease, Term Of Contract Lessor, Lease, Term Of Contract Property, Plant and Equipment [Line Items] Notes Payable [Abstract] Notes Payable [Abstract] Additions to real estate Payment for Acquisition, Real Estate, Held-for-Investment Debt Instrument, Maturity Date, Description Other Increase (Decrease) in Other Operating Assets and Liabilities, Net Increase (Decrease) in Other Operating Assets and Liabilities, Net, Total Effective Date Effective Date Effective date Earnings Per Share, Basic Earnings Per Share, Basic, Total Basic Repayments of long-term Repayments of Long-Term Debt Repayments of Long-Term Debt, Total Total number of Investment Properties leased under operating leases Number Of Investment Properties Leased Under Operating Leases Leases classified as operating leases Debt Costs Debt, Policy [Policy Text Block] Revolving Credit Facility [Member] Revolving Credit Facility [Member] Period for improvements to construction commitments Period For Improvements To Construction Commitments Period For Improvements To Construction Commitments Rental income from operating leases Operating Lease, Lease Income Operating Lease, Lease Income, Total Adjustments to reconcile net earnings to net cash provided by operating activities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity [Abstract] Fair value of notes payable Notes Payable, Fair Value Disclosure Schedule of Sale of Stock by Subsidiary or Equity Method Investee Disclosure [Table Text Block] Schedule of Common Stock Issuances Pursuant to NNN's ATM Payment of debt issuance costs Payments of Debt Issuance Costs Less: stock issuance costs Less: stock issuance costs Stockholders’ equity: Equity, Attributable to Parent [Abstract] Entity Small Business Entity Small Business Accumulated deficit Accumulated deficit Retained Earnings (Accumulated Deficit) Retained Earnings (Accumulated Deficit), Total Retained Earnings (Accumulated Deficit), Beginning Balance Retained Earnings (Accumulated Deficit), Ending Balance Proceeds from Issuance Initial Public Offering Public offering amount Organization, Consolidation and Presentation of Financial Statements [Abstract] Debt costs accumulated amortization Accumulated Amortization, Debt Issuance Costs Loans Payable Loans Payable [Member] Weighted average shares outstanding Weighted average number of shares outstanding Weighted Average Number of Shares Outstanding, Diluted, Adjustment Weighted Average Number of Shares Outstanding, Diluted, Adjustment, Total Amendment Flag Amendment Flag Real estate impairments, net of recoveries Impairment losses – real estate, net of recoveries Impairment of Real Estate Delayed Draw Term Loan (DDTL) [Member] Delayed Draw Term Loan Earnings Per Share Earnings Per Share, Policy [Policy Text Block] LIABILITIES AND EQUITY Liabilities and Equity [Abstract] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Net cash provided by operating activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Debt Instrument, Redemption Price, Percentage Percentage of public offering price Revenue Recognition, Leases [Policy Text Block] Revenue Recognition Common Stock, $0.01 par value Common Stock Common Stock [Member] Plan of Reorganization, Date Plan Expected to be Effective Effective Date Amortization of notes payable discount Amortization of Debt Discount (Premium) Escrow and other restricted accounts Escrow Deposit Entity Address, Address Line One Entity Address, Address Line One Accumulated Other Comprehensive Income (Loss). Accumulated Other Comprehensive Income (Loss) [Policy Text Block] Accumulated Other Comprehensive Income (Loss) Fair Value Hierarchy and NAV [Axis] Earnings Per Share [Abstract] Basic and Diluted Earnings: Net earnings per share: Income Tax, Policy [Policy Text Block] Income Taxes Summary of NNN's Investment Portfolio Schedule Of Investment Properties [Table Text Block] Schedule of number of Investment Property Holdings and gross leasable area and number of states located Supplemental disclosure of cash flow information: Supplemental Cash Flow Information [Abstract] Document Type Document Type Increase (Decrease) In Accrued Rental Income Increase (Decrease) In Accrued Rental Income Increase in accrued rental income Accounted for using the operating method, net of accumulated depreciation and amortization Real estate portfolio, net of accumulated depreciation and amortization Real Estate Investment Property, Net Entity Central Index Key Entity Central Index Key Line of Credit Facility [Table] Line of Credit Facility [Table] Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Net increase in cash, cash equivalents and restricted cash Net decrease in cash, cash equivalents and restricted cash Subsequent Event Type [Domain] Subsequent Event Type [Domain] Interest and other income from real estate transactions Interest Income, Operating Interest Income, Operating, Total Land and improvements Land and Land Improvements Land and Land Improvements, Total Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent, Total Other comprehensive income (loss) Liabilities [Abstract] Liabilities: Summary of tenants classified as cash basis. Summary Of Tenants Classified As Cash Basis [Table Text Block] Summary of tenants classified as cash basis Increase (Decrease) in Other Operating Liabilities Increase (Decrease) in Other Operating Liabilities, Total Increase (decrease) in other liabilities Decrease in other liabilities Total  Stockholders’ Equity of NNN Parent [Member] Weighted average remaining lease term (years) Weighted Average Remaining Lease Term Weighted Average Remaining Lease Term Amortization of interest rate hedges Amortization of Deferred Hedge Gains Debt Disclosure [Abstract] Debt Disclosure [Abstract] Derivative [Table] Derivative [Table] Fair value of forward starting swap Fair value of forward starting swap Fair value of forward starting swaps Fair value of forward starting swap Derivative, Notional Amount Total notional amount to hedge the risk of changes Aggregate Notional Amount Series F Preferred Stock Series F Preferred Stock [Member] Current Fiscal Year End Date Current Fiscal Year End Date Percentage of Public Offering Price Of Principal Amount Percentage of Public Offering Price Of Principal Amount Percentage of public offering price of principal amount Document Quarterly Report Document Quarterly Report Accumulated Other Comprehensive Income (Loss) [Roll Forward] AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward] Accounting Policies [Table] Accounting Policies [Table] Accounting Policies [Table] Entity Address, State or Province Entity Address, State or Province Debt costs Debt Issuance Costs, Gross Debt issuance costs Number of sold properties Number Of Disposed Properties Continuing Operations Number Of Disposed Properties, Continuing Operations Number of properties sold at a gain Below-market in-place leases, net Below Market Lease, Net Below Market Lease, Net, Beginning Balance Below Market Lease, Net, Ending Balance Interest costs capitalized Interest Costs Capitalized Subsequent Event [Member] Subsequent Event Reclassifications from accumulated other comprehensive income to net earnings Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax Reclassifications from accumulated other comprehensive income to net earnings Incremental Restricted Shares Attributable To Contingently Issuable Shares Incremental Restricted Shares Attributable To Contingently Issuable Shares Less: Unvested contingent restricted shares Unsecured Debt Unsecured Debt Unsecured Debt, Total Accumulated Other Comprehensive Income (Loss) AOCI Attributable to Parent [Member] Finite-Lived Intangible Assets, Major Class Name [Domain] Finite-Lived Intangible Assets, Major Class Name [Domain] Increase (Decrease) in Stockholders' Equity [Roll Forward] Increase (Decrease) in Stockholders' Equity [Roll Forward] Unsettled Shares Subject to Forward Sale Agreements Unsettled Shares Subject to Forward Sale Agreements Total unsettled shares subject to forward sale agreements LIBOR London Interbank Offered Rates LIBOR [Member] London Interbank Offered Rates LIBOR [Member] Lessor, Lease, Description [Table] Lessor, Lease, Description [Table] Computation of Basic and Diluted Earnings Per Share Schedule Of Computation Of Earnings Per Share Basic And Diluted [Table Text Block] Represents the calculation of the numerator and denominator used in basic and diluted earnings per share calculation. Real Estate Real Estate Disclosure [Text Block] Accounting Policies [Line Items] Accounting Policies [Line Items] [Line Items] for Accounting Policies [Table] Debt Instrument, Maturity Date Debt Instrument, Maturity Date Minimum Minimum [Member] Amortization expense, in-place leases Amortization of Intangible Assets Amortization of Intangible Assets, Total Repayments of Other Debt Repayments of deferred rent Proceeds from line of credit payable Proceeds from Long-Term Lines of Credit Segment Reporting [Abstract] Preferred Stock, Dividends Per Share, Declared Preferred stock dividends declared and paid (in dollars per share) AOCI, cash flow hedges Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member] Work in progress and improvements Development in Process Percentage of Public Offering Price Of Principal Amount Yield To Maturity Percentage of Public Offering Price Of Principal Amount Yield To Maturity Percentage of public offering price yield to maturity Performance incentive plan expense Performance Incentive Plan Expense The aggregate amount of noncash, equity-based and long-term incentive based employee remuneration. This may include the value of stock options, amortization of restricted stock, amortization of long term incentive compensation and adjustment for officers compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. Total commitment Real Estate Investment, Funding Commitments Real Estate Investment, Funding Commitments Total commitment Intangible lease liabilities (included in other liabilities): Other Liabilities [Abstract] Number of Investment Properties leased under the direct financing method Number Of Investment Properties Leased Under Direct Financing Leases Leases classified as direct financing leases Asset under construction Asset under Construction [Member] Write-off of outstanding receivables and related accrued rent Accounts Receivable, Credit Loss Expense (Reversal) Basis spread on variable rate Debt Instrument, Basis Spread on Variable Rate Notes Payable June Two Thousand Thirty Four [Member] Notes Payable June Two Thousand Thirty Four [Member] Notes Payable 2034 [Member] Notes Payable Due October 2023 [Member] Notes Payable Due October 2023 [Member] Notes Payable Due October 2022 [Member] Allowance on receivables Allowance for Doubtful Accounts, Premiums and Other Receivables Net earnings Net earnings Net earnings Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Lease Income Annualized On Base Rent Lease Income Annualized On Base Rent Lease income annualized on base rent Below-market in-place leases Below Market Lease, Gross Less: Unvested contingent restricted shares Incremental Common Shares Attributable to Dilutive Effect of Contingently Issuable Shares In-place leases ,net Leases, Acquired-in-Place [Member] In-Place Lease Intangibles Accounted for using the direct financing method Direct Financing Lease, Net Investment in Lease, before Allowance for Credit Loss Direct Financing Lease, Net Investment in Lease, before Allowance for Credit Loss, Total Real Estate, Policy [Policy Text Block] Real Estate Portfolio Long-term Debt, Type [Domain] Long-Term Debt, Type [Domain] Weighted average shares outstanding used in basic earnings per share Weighted average number of shares outstanding used in basic earnings per share (in shares) Weighted Average Number of Shares Outstanding, Basic Basic Less: accumulated amortization Below Market Lease, Accumulated Amortization Property, Plant and Equipment, Type [Domain] Long-Lived Tangible Asset [Domain] 2020 ATM ATM Equity Program 2020 [Member] ATM Equity Program 2020 Accrued interest payable Interest Payable Subsequent Events [Text Block] Subsequent Event Term Loan Drew Amount Long-Term Debt Long-Term Debt, Total Term loan payable Variable Rate [Domain] Variable Rate [Domain] Total equity Equity, Attributable to Parent Stockholders' Equity Attributable to Parent, Beginning Balance Stockholders' Equity Attributable to Parent, Ending Balance Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Use of Estimates Use of Estimates, Policy [Policy Text Block] Credit Losses on Financial Instruments Credit Loss, Financial Instrument [Policy Text Block] Disclosure of Share-Based Compensation Arrangements by Share-Based Payment Award [Table Text Block] Schedule of Common Stock Issuances Pursuant to NNN's DRIP Long-Term Debt, Weighted Average Interest Rate, at Point in Time Weighted average interest rate Term Loan   Noncontrolling Interests Noncontrolling Interest [Member] Extended Maturity [Member] Extended Maturity [Member] Debt Instrument, Name [Domain] Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivative Instruments and Hedging Activities Disclosure [Abstract] Increase (Decrease) in Other Operating Assets Increase (Decrease) in Other Operating Assets, Total Increase in other assets Interest expense Interest Expense, Operating and Nonoperating Interest Expense, Total Dividends, Common Stock, Stock Common stock dividends declared and paid Common stock dividends declared and paid Credit Facility [Axis] ATM equity program Stock Issued During Period, Value, Other Loan Restructuring Modification [Axis] Principal payments received on mortgages and notes receivable Proceeds from Collection of Notes Receivable Real Estate Impairments Details of Impairment of Long-Lived Assets Held and Used by Asset [Table Text Block] Revolving credit facility weighted average outstanding balance Line of Credit Facility, Average Outstanding Amount Weighted average outstanding balance Term Loan Disposal Groups, Including Discontinued Operations, Name [Domain] Disposal Group Name [Domain] Gross leasable area (square feet) Area of Real Estate Property Entity Address, City or Town Entity Address, City or Town Number of Reportable Segments Number of Reportable Segments Security Exchange Name Security Exchange Name Number of Interest Rate Derivatives Held Number of Interest Rate Derivatives Credit Facility [Domain] Leasing transaction costs Lease, Transaction Cost Lease, Transaction Cost Forward Starting Swaps Two [Member] Forward Starting Swaps Two [Member] Forward Swaps 2 Weighted average interest rate Debt, Weighted Average Interest Rate Total properties Investment Properties Total Investment Properties Total Disclosure of Long Lived Assets Held-for-sale, Gains Recognized [Table Text Block] Disclosure of Long Lived Assets Held-for-sale, Gains Recognized [Table Text Block] Gains on Dispositions of Properties Real Estate [Abstract] Real Estate [Abstract] Cash, cash equivalents and restricted cash at beginning of period Cash, cash equivalents and restricted cash at end of period Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Total Interest paid, net of amount capitalized Interest Paid, Excluding Capitalized Interest, Operating Activity Statistical Measurement [Domain] Statistical Measurement [Domain] DRIP [Member] DRIP [Member] DRIP [Member] Document Period End Date Document Period End Date Real Estate Held for Sale Policy Text Block Real Estate - Held for Sale Real Estate Held for Sale Policy Text Block Fair Value Hierarchy and NAV [Domain] Accrued rental income Deferred Rent Receivables, Net Accrued rental income, net of allowance of $3,528 and $3,393, respectively Lease Income, Accrued During Period Lease Income, Accrued During Period Rental income accrued during period Term Loan Long-Term Debt [Text Block] Rent Due Rent Due Originally rent due Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Line of Credit Line of Credit [Member] Class of Stock [Axis] Class of Stock [Axis] Notes Payable Due June 2034 [Member] NotesPayableDueJune2034 Notes Payable 2034 [Member] Total liabilities Liabilities Leasehold interests Tenant Improvements Common stock dividends declared and paid Adjustments to Additional Paid in Capital, Dividends in Excess of Retained Earnings Common stock dividends declared and paid Total Properties Lease Income Recognized On Cash Basis, Percentage Of Total Properties Lease Income Recognized On Cash Basis, Percentage Of Total Properties Other comprehensive income: Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest [Abstract] Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Table] Disposal Groups, Including Discontinued Operations [Table] Variable Rate [Axis] Variable Rate [Axis] Leases Finite-Lived Intangible Assets, Gross Finite-Lived Intangible Assets, Gross, Total Performance incentive plan payment Performance Incentive Plan Payment Performance Incentive Plan Payment Weighted average shares outstanding used in diluted earnings per share Weighted Average Number of Shares Outstanding, Diluted Weighted average number of shares outstanding used in diluted earnings per share (in shares) Diluted Entity File Number Securities Act File Number Payment of common stock dividends Payments of Ordinary Dividends, Common Stock Dividends Equity Plan Name [Domain] Equity Plan Name [Domain] Equity Plan Name [Domain] Other assets Other Assets Other Assets, Total Cover [Abstract] Cover [Abstract] Impairment losses – real estate, net of recoveries Impairment Losses and Other Charges Impairment Losses and Other Charges Percentage rent Variable Lease, Income Offsetting Assets [Line Items] Settlement of forward starting swaps Settlement of forward starting swaps Settlement of forward starting swaps Debt Issuance Costs, Line of Credit Arrangements, Net Debt Issuance Costs, Line of Credit Arrangements, Net, Total Debt costs, net of accumulated amortization of $31,348 and $29,930, respectively Number of Operating Segments Number of Operating Segments Segment Reporting Disclosure [Text Block] Segment Information General and administrative General and Administrative Expense General and Administrative Expense, Total Interest rate cash flow hedge gain (loss) to be reclassified over next 12 months, net Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net Subsequent Event [Table] Entities [Table] Entities [Table] Stock Issued During Period, Shares, Other Issuance of common stock - ATM equity program (in shares) Common stock issued Shares Leases, net Finite-Lived Intangible Assets, Net Finite-Lived Intangible Assets, Net, Beginning Balance Finite-Lived Intangible Assets, Net, Ending Balance Letter of Credit, Sublimit Amount Letter of Credit, Sublimit Amount Letter of credit, sublimit amount Supplemental Change In Other Comprehensive Income Change in other comprehensive income Supplemental change in other comprehensive income Vacant Number Of Impaired Real Estate Properties, Vacant Number Of Impaired Real Estate Properties, Vacant Lease Accounting Lessor, Leases [Policy Text Block] Property estimated useful life Property, Plant and Equipment, Useful Life New Accounting Pronouncements, Policy [Policy Text Block] New Accounting Pronouncements Derivative Instruments, Gain (Loss) [Table] Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed Percentage of Principal Amount Redeemed Common Stock, Shares, Outstanding Common stock, shares outstanding (in shares) Common Stock, Shares, Outstanding, Beginning Balance Common Stock, Shares, Outstanding, Ending Balance Depreciation, Depletion and Amortization, Total Depreciation and amortization Depreciation, Depletion and Amortization Option to increase facility size Line Of Credit Facility, Accordion Feature, Increase Limit Line Of Credit Facility, Accordion Feature, Increase Limit Document Transition Report Document Transition Report Total operating expenses Operating Expenses Mortgage loan Real Estate Loan [Member] Comprehensive income attributable to NNN Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Total comprehensive income Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Schedule of Interest Rate Derivatives [Table Text Block] Schedule of Interest Rate Derivatives Designated as Cash Flow Hedges Stockholders' Equity Equity [Text Block] Finite-Lived Intangible Assets [Line Items] Finite-Lived Intangible Assets [Line Items] Net earnings attributable to NNN Net earnings Preferred stock dividends declared and paid Dividends, Preferred Stock, Cash Line of Credit Facility [Line Items] Line of Credit Facility [Line Items] Accounted for using the operating method Operating Lease, Net Investment In Lease Operating Lease, Net Investment In Lease ASSETS Assets [Abstract] Document Fiscal Year Focus Document Fiscal Year Focus Less accumulated depreciation and amortization Real Estate Investment Property, Accumulated Depreciation Changes in Accumulated Other Comprehensive Income (Loss) Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Cash flows from investing activities: Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract] Less: Unvested restricted shares Weighted Average Number of Shares, Restricted Stock Real estate subject to operating leases, gross Real Estate Investment Property, at Cost Revenue recognized on cash basis Lease Income Recognized On Cash Basis Lease Income Recognized On Cash Basis Debt Instrument Redemption [Table] Other liabilities Other Liabilities Other Liabilities, Total Fair Value Disclosures [Abstract] Real Estate Properties [Line Items] Repayment of line of credit payable Repayment of line of credit payable Repayments of Long-Term Lines of Credit Net earnings available to NNNs common stockholders Net Income (Loss) Available to Common Stockholders, Basic Net earnings Notes Payable [Table Text Block] Notes Payable [Table Text Block] Notes Payable Line of credit payable Long-Term Line of Credit Long-term Line of Credit, Total Line of credit facility Debt Instrument [Axis] Derivative Instrument [Axis] Derivative Instrument [Axis] Total revenues Revenues Net cash used in investing activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation Lease Income [Abstract] Lease Income [Abstract] Title of 12(b) Security Title of 12(b) Security Amortization of deferred compensation Amortization Of Deferred Compensation Amortization of deferred compensation Interest and other income Interest and other income Investment Income, Net Investment Income, Net, Total Derivative Instruments and Hedging Activities Disclosure [Text Block] Derivatives Notes Payable February TwoThousand Thirty One [Member] Notes Payable February TwoThousand Thirty One [Member] Notes Payable 2031 [Member] Notes Payable 2033 [Member] Notes Payable 2033 [Member] Notes Payable 2033 [Member] Change in operating assets and liabilities, net of assets acquired and liabilities assumed: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Increase (Decrease) in Operating Capital [Abstract] Property, Plant and Equipment [Table Text Block] Summary of Real Estate Subject to Operating Leases Dividends, Cash [Abstract] Dividends declared and paid: Capital in Excess of Par Value Additional Paid-in Capital [Member] Director compensation Stock Issued During Period, Value, Issued for Services Trading Symbol Trading Symbol Schedule of ATM Program Schedule Of At The Market Equity Program [Table Text Block] Schedule of At The Market Equity Program [Table Text Block] Schedule of Finite-Lived Intangible Assets [Table] Intangible Asset, Finite-Lived [Table] Retirement And Severance Costs Retirement And Severance Costs Retirement and severance costs Proceeds from Notes Payable Proceeds from Notes Payable, Total Proceeds from term loan payable Intangible Assets, Lease Liabilities, and Related Amortization Schedule of Finite-Lived Intangible Assets And Below-Market Lease Liabilities, And Future Amortization [Table Text Block] Schedule of Finite-Lived Intangible Assets And Below-Market Lease Liabilities, And Future Amortization [Table Text Block] Assets Held-for-sale Disposal Group, Held-for-Sale, Not Discontinued Operations [Member] Subsequent Event Type [Axis] Subsequent Event Type [Axis] Real estate subject to operating leases, net, before work in progress Real Estate Investment Property, Net, Before Development In Process Real Estate Investment Property, Net, Before Development In Process Cash flows from financing activities: Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract] Equity Components [Axis] Equity Components [Axis] Rental revenues Rental Revenues Lease Income Before Real Estate Expense Reimbursements From Tenants. Rental Revenues, Total Accounts and Financing Receivable, after Allowance for Credit Loss Accounts and Financing Receivable, after Allowance for Credit Loss, Total Receivables, net of allowance of $567 and $609, respectively Line of Credit, Current Line of credit payable Equity Component [Domain] Equity Component [Domain] Lessor, Lease, Description [Line Items] Lessor, Lease, Description [Line Items] Increase (Decrease) in Finished Goods and Work in Process Inventories Change in work in progress accrual Rental income Rental income Lease Income Operating Lease Income Statement, Real Estate Expense Reimbursement From Tenants Operating Lease Income Statement, Real Estate Expense Reimbursement From Tenants Real estate expenses reimbursed from tenants Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures Stock Issued During Period, Shares, Restricted Stock Award, Net of Forfeitures, Total Issuance of common stock - restricted shares, net (in shares) Stock Issued During Period, Shares, Employee Stock Purchase Plans Issuance of common stock - Stock purchase plan (in shares) Depreciation and amortization Depreciation, Depletion and Amortization, Nonproduction Depreciation, Depletion and Amortization, Nonproduction, Total Building and Building Improvements [Member] Debt Instrument, Redemption [Line Items] Intangible lease assets (included in other assets): Intangible Assets, Net (Excluding Goodwill) [Abstract] Maximum Maximum [Member] Statistical Measurement [Axis] Statistical Measurement [Axis] Less: accumulated amortization Finite-Lived Intangible Assets, Accumulated Amortization Forward Swap [Member] Forward Swap [Member] Forward Swap Common Stock, Value, Issued Common Stock, Value, Issued, Total Common Stock, Value, Issued, Beginning Balance Common Stock, Value, Issued, Ending Balance Common stock, $0.01 par value. Authorized 375,000,000 shares; 191,931,110 and 189,937,404 shares issued and outstanding, respectively States Number of States in which Entity Operates Weighted average fixed interest rate Derivative, Fixed Interest Rate Fixed Rate Paid Net earnings used in basic and diluted earnings per share Net Income (Loss) Available to Common Stockholders, Diluted Line of Credit Facility, Expiration Date Credit facility maturity date Principles of Consolidation Consolidation, Policy [Policy Text Block] Stockholders' equity Total equity Balances Balances Equity, Including Portion Attributable to Noncontrolling Interest Amortization of Debt Issuance Costs Amortization of debt costs Amortization of debt costs Less: Earnings allocated to unvested restricted shares Earnings Attributable To Unvested Restricted Shares Using the Two-Class Method Earnings attributable to unvested shares using the two-class method Other expenses (revenues): Other Nonoperating Income (Expense) [Abstract] Finite-Lived Intangible Assets by Major Class [Axis] Finite-Lived Intangible Assets by Major Class [Axis] Number of tenants Percentage of tenants for which revenue recognized on cash basis Lease Income Recognized On Cash Basis, Number Of Tenants Lease Income Recognized On Cash Basis, Number Of Tenants Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Forward Starting Swap One [Member] Forward Starting Swap One [Member] Forward Swap 1 Entity Registrant Name Entity Registrant Name Line of Credit Payable Debt Disclosure [Text Block] Debt costs accumulated amortization Accumulated Amortization of Debt Issuance Costs, Line of Credit Arrangements Total other expenses (revenues) Other Nonoperating Income (Expense) Total other expenses (revenues) Capital in excess of par value Additional Paid in Capital Additional Paid in Capital, Total Additional Paid in Capital, Beginning Balance Additional Paid in Capital, Ending Balance Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income (Loss) [Table] Subsequent Events [Abstract] Proceeds from the disposition of real estate Proceeds from Sale, Real Estate, Held-for-Investment Proceeds from Sale of Real Estate Held-for-investment, Total SOFR Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Forward Starting Swaps Three [Member] Forward Starting Swaps Three [Member] Forward Swaps 3 Common stock dividends per share (in dollars per share) Common Stock, Dividends, Per Share, Cash Paid Per share Average per share price (gross) Average Per Share Price Gross Average Per Share Price Gross Net proceeds Proceeds from issuance of common stock Proceeds from Issuance of Common Stock Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Accumulated other comprehensive income (loss) Accumulated Other Comprehensive Income (Loss), Net of Tax Accumulated Other Comprehensive Income (Loss), Net of Tax, Total Anticipated Net Proceeds from Unissued Share Anticipated Net Proceeds from Unissued Share Anticipated net proceeds from unissued shares Other Payment for (Proceeds from) Other Investing Activity Total assets Assets Class of Financing Receivable [Domain] Class of Financing Receivable [Domain] Income Statement [Abstract] Income Statement [Abstract] Fair Value Measurement Fair Value of Financial Instruments, Policy [Policy Text Block] Equity Plan Name [Axis] Equity Plan Name [Axis] Equity Plan Name [Axis] Notes Payable [Text Block] Notes Payable [Text Block] Notes Payable Lease Income Recognized On Cash Basis, Percentage Of Aggregate Gross Leasable Area Lease Income Recognized On Cash Basis, Percentage Of Aggregate Gross Leasable Area % of gross leasable area Sale of Stock, Number of Shares Issued in Transaction Shares of common stock Total remaining allowable shares Loans Payable Loans Payable, Total Term loan payable Term loan payable, net of unamortized debt costs Earnings Per Share, Diluted Earnings Per Share, Diluted, Total Diluted City Area Code City Area Code Number of properties Real Estate Investment Funding Construction Commitments, Number Of Properties Real Estate Investment Funding Construction Commitments, Number Of Properties Termination Date Termination Date Termination date Weighted average number of shares outstanding including unvested restricted shares Weighted Average Number Of Shares Outstanding Weighted average number of shares outstanding (in shares) Weighted average shares outstanding Debt Instrument, Face Amount Principle amount Property Subject to or Available for Operating Lease, by Major Property Class [Table] Property, Plant, and Equipment, Lessor Asset under Operating Lease [Table] Revolving credit facility borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity Unsecured term loan, maximum borrowing capacity Defined Benefit Plan [Table] Real Estate, Held-for-Sale Classified as held for sale Amortization of interest rate hedges Gain (loss) reclassification to interest expense Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax Amortization of interest rate hedges Amortization of interest rate hedges Disclosure of accounting policy for dispositions of real estate. Real Estate Dispositions [Policy Text Block] Real Estate Dispositions Stock purchase plan Stock Issued During Period, Value, Employee Stock Purchase Plan Accrued rental income allowance Deferred Rent Receivables, Allowance For Credit Loss The valuation allowance as of the balance sheet date to reduce the gross amount of accrued rent receivable to estimated net realizable value, which would be presented in parentheses on the face of the balance sheet. Land Improvements [Member] Disposal Group Name [Axis] Disposal Group Name [Axis] Amortization expense, above- and below-market leases Amortization of above and below Market Leases Amortization expense, above- and below-market leases Real estate Lease, Cost Lease, Cost, Total Cash and Cash Equivalents Cash and Cash Equivalents, Policy [Policy Text Block] Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures Restricted shares, net of forfeitures Stock Issued During Period, Value, Restricted Stock Award, Net of Forfeitures, Total Restricted shares, net of forfeitures Earnings from operations Operating Income (Loss) Disclosure of accounting policy for collectability. Collectability [Policy Text Block] Collectability Accumulated Deficit Retained Earnings [Member] ATM equity programs ATM Equity Program [Member] ATM Equity Program [Member] Stock issuance costs Payments of Stock Issuance Costs Loan costs incurred Debt Issuance Costs, Line of Credit Arrangements, Gross Fair Value, Inputs, Level 1 [Member] Debt Securities, Held-to-Maturity, Weighted Average Yield Principal amount for yield to maturity Class of Stock [Line Items] Class of Stock [Line Items] Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Net cash provided by financing activities Notes payable, net of unamortized discount and unamortized debt costs Notes Payable Notes Payable, Total Derivative Contract [Domain] Derivative Contract [Domain] Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] Gross proceeds Gross Proceeds Gross Proceeds Debt Instrument Maximum Amount Debt Instrument Maximum Amount Debt Instrument Maximum Amount Entity Information [Line Items] Entity Information [Line Items] Entity Interactive Data Current Entity Interactive Data Current Operating Lease, Lease Income [Table Text Block] Rental Income, Operating Leases Remaining commitment Real Estate Investment, Funding Commitments, Remaining Commitment Real Estate Investment, Funding Commitments, Remaining Commitment Remaining Commitment, Total Cash flows from operating activities: Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract] Gain on disposition of real estate Gain (Loss) on Sale of Properties Loan Restructuring Modification [Domain] Schedule of Dividends Declared and Paid Schedule of Dividends Declared and Paid [Table Text Block] Schedule of Dividends Declared and Paid [Table Text Block] Above-market in-place leases, net Above Market Leases [Member] Common Stock, Dividends, Per Share, Declared Common stock dividends declared (in dollars per share) Common stock dividends declared and paid Stock Issued During Period, Shares, Issued for Services Issuance of common stock - Director compensation (in shares) Real Estate Investment Property, at Cost [Abstract] Property Portfolio: Line of Credit Facility, Current Borrowing Capacity Line of credit facility, current borrowing capacity Gain on disposition of real estate Gains (Losses) on Sales of Investment Real Estate Gain Entity Tax Identification Number Entity Tax Identification Number Equity: Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] Revenues: Revenues [Abstract] Long-term Debt, Type [Axis] Long-Term Debt, Type [Axis] Less amount funded Less amount funded Real Estate Investment, Funding Commitments, Amount Funded Real Estate Investment, Funding Commitments, Amount Funded Organization and Summary of Significant Accounting Policies Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Local Phone Number Local Phone Number Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss) [Line Items] Weighted Average Number of Shares Outstanding, Diluted [Abstract] Weighted average shares outstanding: Stock issuance costs Stock Issuance Costs Stock issuance costs Sale of Stock, Average Price Per Share Sale of Stock, Average Price Per Share Average price per share (net) Dilutive Effect of Forward ATM Offerings Dilutive Effect of Forward ATM Offerings Dilutive effect of forward ATM offerings Accounting Policies [Abstract] Accounting Policies [Abstract] Common Stock, Number of Shares, Par Value and Other Disclosure [Abstract] Issuance of common stock: Stock Issued During Period, Shares, Dividend Reinvestment Plan Shares of common stock Disclosure of accounting policy for impairment of real estate. Impairment of Real Estate [Policy Text Block] Impairment - Real Estate Class of Stock [Domain] Class of Stock [Domain] Cash basis tenants as a percent of: Cash Basis Tenants As A Percent Of Cash basis tenants as a percent of: Schedule of Stock by Class [Table] Stock, Class of Stock [Table] Entity Emerging Growth Company Entity Emerging Growth Company Number Of Impaired Real Estate Properties, Occupied Occupied Number Of Impaired Real Estate Properties, Occupied