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Leases - Carrying value of property leased or held for lease to others (Details) - Property leased or held for lease $ in Thousands | Dec. 31, 2018 USD ($)
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Construction aggregates property | $ 35,294
Commercial property | 55,842
Carrying Value of property owned by the Company leased or held for lease, gross | 91,136
Less accumulated depreciation and depletion | 17,223
Carrying Value of property owned by the Company leased or held for lease, net | $ 73,913

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- Definition Accumulated Depreciation and Depletion of leased real estate + References No definition available. + Details
Name: | FRPH_AccumulatedDepreciationDepletionRealEstateLeased
Namespace Prefix: | FRPH_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Commercial Property + References No definition available. + Details
Name: | FRPH_CommercialProperty
Namespace Prefix: | FRPH_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
Name: | FRPH_ConstructionAggregatesProperty
Namespace Prefix: | FRPH_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
Name: | FRPH_RealEstateLeasedCarryingValueGross
Namespace Prefix: | FRPH_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
Name: | FRPH_RealEstateLeasedCarryingValueNet
Namespace Prefix: | FRPH_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | us-gaap_RealEstatePropertiesAxis=us-gaap_PropertySubjectToOperatingLeaseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |