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Investments in Joint Ventures - Schedule of Investments in Unconsolidated Joint Ventures (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Total Assets of The Partnership | $ 731,260 |  | $ 731,260 |  | $ 728,485
Profit (Loss) Of the Partnership | 565 | $ 1,379 | 2,823 | $ 4,773 |
The Company's Share of Profit (Loss) of the Partnership | (2,225) | $ (2,839) | (6,635) | $ (8,582) |
Total Assets of The Partnership |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Total Assets of The Partnership | 527,888 |  | 527,888 |  |
Profit (Loss) Of the Partnership |  |  | (9,995) |  |
Brooksville Quarry, LLC |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Total Assets of The Partnership | 14,489 |  | 14,489 |  | 14,498
Profit (Loss) Of the Partnership |  |  | (72) |  |
BC FRP Realty, LLC |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Total Assets of The Partnership | 23,647 |  | 23,647 |  | 21,930
Profit (Loss) Of the Partnership |  |  | 518 |  |
Buzzard Point Sponsor, LLC |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Total Assets of The Partnership | 5,072 |  | 5,072 |  | 4,892
Profit (Loss) Of the Partnership |  |  | 0 |  |
Bryant Street Partnerships |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Total Assets of The Partnership | 188,200 |  | 188,200 |  | 194,390
Profit (Loss) Of the Partnership |  |  | (5,111) |  |
Lending ventures |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Total Assets of The Partnership | 10,339 |  | 10,339 |  | 16,007
Profit (Loss) Of the Partnership |  |  | 0 |  |
Estero Partnership |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Total Assets of The Partnership | 55,257 |  | 55,257 |  | 41,346
Profit (Loss) Of the Partnership |  |  | 0 |  |
The Verge Partnership |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Total Assets of The Partnership | 122,840 |  | 122,840 |  | 126,399
Profit (Loss) Of the Partnership |  |  | (3,127) |  |
Greenville Partnerships |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Total Assets of The Partnership | 108,044 |  | 108,044 |  | $ 97,577
Profit (Loss) Of the Partnership |  |  | (2,203) |  |
The Company's Share of Profit (Loss) of the Partnership |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
The Company's Total Investment | $ 143,298 |  | 143,298 |  |
The Company's Share of Profit (Loss) of the Partnership |  |  | $ (6,635) |  |
Brooksville Quarry, LLC |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
FRP Ownership | 50.00% |  | 50.00% |  |
The Company's Total Investment | $ 7,541 |  | $ 7,541 |  |
The Company's Share of Profit (Loss) of the Partnership |  |  | $ (36) |  |
BC FRP Realty, LLC |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
FRP Ownership | 50.00% |  | 50.00% |  |
The Company's Total Investment | $ 4,865 |  | $ 4,865 |  |
The Company's Share of Profit (Loss) of the Partnership |  |  | $ 259 |  |
Buzzard Point Sponsor, LLC |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
FRP Ownership | 50.00% |  | 50.00% |  |
The Company's Total Investment | $ 2,536 |  | $ 2,536 |  |
The Company's Share of Profit (Loss) of the Partnership |  |  | $ 0 |  |
Bryant Street Partnerships |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
FRP Ownership | 72.08% |  | 72.08% |  |
The Company's Total Investment | $ 60,938 |  | $ 60,938 |  |
The Company's Share of Profit (Loss) of the Partnership |  |  | (4,058) |  |
Lending ventures |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
The Company's Total Investment | $ 13,749 |  | 13,749 |  |
The Company's Share of Profit (Loss) of the Partnership |  |  | $ 0 |  |
Estero Partnership |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
FRP Ownership | 16.00% |  | 16.00% |  |
The Company's Total Investment | $ 6,971 |  | $ 6,971 |  |
The Company's Share of Profit (Loss) of the Partnership |  |  | $ 0 |  |
The Verge Partnership |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
FRP Ownership | 61.37% |  | 61.37% |  |
The Company's Total Investment | $ 34,922 |  | $ 34,922 |  |
The Company's Share of Profit (Loss) of the Partnership |  |  | $ (1,919) |  |
Greenville Partnerships |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
FRP Ownership | 56.52% |  | 56.52% |  |
The Company's Total Investment | $ 11,776 |  | $ 11,776 |  |
The Company's Share of Profit (Loss) of the Partnership |  |  | $ (881) |  |

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