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Tax Receivable Agreement (Details) - USD ($) | 9 Months Ended |
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Other Liabilities Disclosure [Abstract] |  |  |
Payable pursuant to tax receivable agreement | $ 173,849,000 |  | $ 173,424,000
TRA payments | $ 0 | $ 0 |

X
- Definition Aggregate Payments for Contractual Obligation + References No definition available. + Details
Name: | fph_AggregatePaymentsforContractualObligation
Namespace Prefix: | fph_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Tax Receivable Agreement, Liability, Noncurrent + References No definition available. + Details
Name: | fph_TaxReceivableAgreementLiabilityNoncurrent
Namespace Prefix: | fph_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_OtherLiabilitiesDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration