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REVENUES - Additional Information (Details) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Sep. 30, 2024	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Increase (Decrease) In Contract With Customer, Asset [Roll Forward]
Contract assets, beginning balance		$ 72,100	$ 86,500
Increase (decrease) from revenue recognized		29,700	(14,400)
Contract assets, ending balance		101,800	72,100	$ 86,500
Related Party
Increase (Decrease) In Contract With Customer, Asset [Roll Forward]
Contract assets, beginning balance		69,100	79,900
Contract assets, ending balance		100,800	69,100	79,900
Great Park | Related Party
Increase (Decrease) In Contract With Customer, Asset [Roll Forward]
Increase in annual management agreement fixed base fee	$ 13,500	12,000		$ 12,000
Revenue from customers		$ 50,900	$ 46,500

X

- Definition

Annual Management Agreement Fixed Base Fee

+ References

No definition available.

+ Details

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Balance Type:	credit
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X

- Definition

Increase (Decrease) In Contract With Customer, Asset [Roll Forward]

+ References

No definition available.

+ Details

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Namespace Prefix:	fph_
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X

- Definition

Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479837/606-10-45-3

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479837/606-10-45-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 8
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479806/606-10-50-8

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	debit
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X

- Definition

Amount of increase (decrease) in right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 28
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-28

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X

- Definition

Cash receipts from customers during the current period which are usually for sales of goods and services.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 25
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482740/230-10-45-25

+ Details

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- Details

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