Business Segments - Narrative (Details)	6 Months Ended
Jun. 30, 2026 a lease joint_venture warehouse park segment	Oct. 21, 2025 joint_venture
Segment Reporting [Line Items]
Number of reportable segments \| segment	4
Number of warehouses \| warehouse	10
Number of business parks \| park	3
Number of ground leases \| lease	2
Number of acres \| a	16,640
Brooksville Joint Venture \| Brooksville Joint Venture
Segment Reporting [Line Items]
FRP Ownership (as a percent)	50.00%
Brooksville Joint Venture \| Vulcan Materials
Segment Reporting [Line Items]
FRP Ownership (as a percent)	50.00%
Operating segments \| Development
Segment Reporting [Line Items]
Number of consolidated joint ventures \| joint_venture		3
Operating segments \| Multifamily
Segment Reporting [Line Items]
Number of consolidated joint ventures \| joint_venture	2
Brooksville Joint Venture
Segment Reporting [Line Items]
Number of acres \| a	4,280

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Area of land held.

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Number of separate real estate development properties located on land subject to ground leases.

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Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

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The number of units in a real estate property owned as of the balance sheet date.

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