Investments in Joint Ventures - Schedule of Investments in Unconsolidated Joint Ventures (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024
Schedule of Equity Method Investments [Line Items]
The Company's Total Investment	$ 148,302
Total Assets of The Partnership	717,123		$ 728,485
Profit (Loss) Of the Partnership	1,634	$ 1,335
The Company's Share of Profit (Loss) of the Partnership	(2,031)	$ (3,019)
Total Assets of The Partnership
Schedule of Equity Method Investments [Line Items]
Total Assets of The Partnership	509,258
Profit (Loss) Of the Partnership	(3,165)
Brooksville Quarry, LLC
Schedule of Equity Method Investments [Line Items]
Total Assets of The Partnership	14,494		14,498
Profit (Loss) Of the Partnership	(24)
BC FRP Realty, LLC
Schedule of Equity Method Investments [Line Items]
Total Assets of The Partnership	21,965		21,930
Profit (Loss) Of the Partnership	142
Buzzard Point Sponsor, LLC
Schedule of Equity Method Investments [Line Items]
Total Assets of The Partnership	4,912		4,892
Profit (Loss) Of the Partnership	0
Bryant Street Partnerships
Schedule of Equity Method Investments [Line Items]
Total Assets of The Partnership	192,146		194,390
Profit (Loss) Of the Partnership	(1,694)
Lending ventures
Schedule of Equity Method Investments [Line Items]
Total Assets of The Partnership	13,308		16,007
Profit (Loss) Of the Partnership	0
Estero Partnership
Schedule of Equity Method Investments [Line Items]
Total Assets of The Partnership	41,605		41,346
Profit (Loss) Of the Partnership	0
The Verge Partnership
Schedule of Equity Method Investments [Line Items]
Total Assets of The Partnership	125,281		126,399
Profit (Loss) Of the Partnership	(927)
Greenville Partnerships
Schedule of Equity Method Investments [Line Items]
Total Assets of The Partnership	95,547		$ 97,577
Profit (Loss) Of the Partnership	(662)
The Company's Share of Profit (Loss) of the Partnership
Schedule of Equity Method Investments [Line Items]
The Company's Share of Profit (Loss) of the Partnership	$ (2,031)
Brooksville Quarry, LLC
Schedule of Equity Method Investments [Line Items]
FRP Ownership	50.00%
The Company's Total Investment	$ 7,566
The Company's Share of Profit (Loss) of the Partnership	$ (12)
BC FRP Realty, LLC
Schedule of Equity Method Investments [Line Items]
FRP Ownership	50.00%
The Company's Total Investment	$ 5,815
The Company's Share of Profit (Loss) of the Partnership	$ 71
Buzzard Point Sponsor, LLC
Schedule of Equity Method Investments [Line Items]
FRP Ownership	50.00%
The Company's Total Investment	$ 2,456
The Company's Share of Profit (Loss) of the Partnership	$ 0
Bryant Street Partnerships
Schedule of Equity Method Investments [Line Items]
FRP Ownership	72.10%
The Company's Total Investment	$ 63,992
The Company's Share of Profit (Loss) of the Partnership	(1,256)
Lending ventures
Schedule of Equity Method Investments [Line Items]
The Company's Total Investment	23,160
The Company's Share of Profit (Loss) of the Partnership	$ 0
Estero Partnership
Schedule of Equity Method Investments [Line Items]
FRP Ownership	16.00%
The Company's Total Investment	$ 3,737
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%
The Company's Total Investment	$ 36,578
The Company's Share of Profit (Loss) of the Partnership	$ (569)
Greenville Partnerships
Schedule of Equity Method Investments [Line Items]
FRP Ownership	40.00%
The Company's Total Investment	$ 4,998
The Company's Share of Profit (Loss) of the Partnership	$ (265)