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Schedule IV - Mortgage Loans on Real Estate (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |
Face Amount of Mortgages |  | $ 3,000 |  |  |  |
Carrying amount of mortgages |  | 996 | [1] | $ 1,521 | $ 2,011 | $ 2,468
Principal Amount of Loans Subject to Delinquent Principal or Interest |  | 0 |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate [Roll Forward] |  |  |  |  |  |
Balance at beginning of year |  | 1,521 |  | 2,011 | 2,468 |
New mortgage loans |  | 0 |  | 0 | 0 | 3,000
Deductions during the year: |  |  |  |  |  |
Collections of principal |  | (559) |  | (521) | (486) |
Other: credit (losses) recoveries | [2] | 34 |  | 31 | 29 |
Foreclosures |  | 0 |  | 0 | 0 |
Balance at the close of year |  | 996 | [1] | 1,521 | 2,011 | 2,468
Mortgages held, federal income tax basis |  | 1,002 |  | 1,530 | 2,011 |
Mortgages accepted in connection with real estate transactions |  | $ 0 |  | $ 0 | $ 0 | $ 3,000
2 properties in VA |  |  |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |  |  |
Interest Rate |  | 7.00% |  |  |  |
Face Amount of Mortgages |  | $ 3,000 |  |  |  |
Carrying amount of mortgages | [1] | 996 |  |  |  |
Principal Amount of Loans Subject to Delinquent Principal or Interest |  | 0 |  |  |  |
Deductions during the year: |  |  |  |  |  |
Balance at the close of year | [1] | $ 996 |  |  |  |
[1] | Mortgages held by NNN and its subsidiaries for federal income tax purposes for the year ended December 31, 2023, 2022 and 2021 were $1,002, $1,530 and $2,011, respectively.
[2] | In accordance with FASB ASC Topic 326, Financial Instruments - Credit Losses, NNN recorded an allowance for an estimated expected lifetime credit loss on its mortgage receivables based on the fair value of the collateral and the historical collectability trend analysis over 15 years.

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- Definition SEC Schedule, 12-29, Real Estate Companies, Investment in Movement in Mortgage Loans on Real Estate, Period Decrease [Abstract] + References No definition available. + Details
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- Definition Amount of decrease in investment in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate, from collection of principal. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-X (SX) -Number 210 -Section 12 -Subsection 29 -Footnote 6 -Publisher SEC Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 948 -SubTopic 310 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29(Footnote 6)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479851/948-310-S99-1 + Details
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- Definition Amount of contractual principal due at origination of mortgage loan within investment in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-X (SX) -Number 210 -Section 12 -Subsection 29 -Paragraph Column F -Publisher SEC Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 948 -SubTopic 310 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29(Column F)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479851/948-310-S99-1 + Details
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- Definition Amount of federal income tax basis of investment in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-X (SX) -Number 210 -Section 12 -Subsection 29 -Footnote 8 -Publisher SEC Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 948 -SubTopic 310 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29(Footnote 8)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479851/948-310-S99-1 + Details
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- Definition Amount of principal due on delinquent mortgage loan within investment in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-X (SX) -Number 210 -Section 12 -Subsection 29 -Paragraph Column H -Publisher SEC Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 948 -SubTopic 310 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29(Column H)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479851/948-310-S99-1 + Details
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- Definition Amount of increase in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate, from new investment. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 948 -SubTopic 310 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29(Footnote 6)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479851/948-310-S99-1 + Details
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