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v3.19.1

Intangible assets and liabilities (Details) (Parenthetical) | 12 Months Ended
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Dec. 31, 2018
In place leases |
Useful life | 0-8 years
Above Market leases |
Useful life | 5 years
Below market leases |
Useful life | 4-5 years

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- References No definition available. + Details
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Namespace Prefix: | FRPH_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=FRPH_BelowMarketLeaseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |