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)