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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

X

- 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