Commitments and Contingencies (Details) - USD ($)				12 Months Ended
	Jan. 01, 2019	May 02, 2016	Nov. 13, 2014	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2020	Jan. 31, 2012
Lessee, Lease, Description [Line Items]
Carrying amount of liability for certain obligations of the settlement				$ 17,700,000
Remaining estimated maximum potential amount of monetary payments subject to guaranty				24,100,000
Aggregate payments for infrastructure project				0	$ 0	$ 0
Outstanding performance bonds				230,000,000.0	73,500,000
Outstanding letters of credit				2,400,000	2,400,000
Letter of Credit
Lessee, Lease, Description [Line Items]
Restricted cash and certificates of deposit pledged as collateral				1,400,000	1,400,000
Notes Payable | Macerich Note
Lessee, Lease, Description [Line Items]
Repayments of debt			$ 65,100,000
Affiliated Entity | CPHP Development, LLC
Lessee, Lease, Description [Line Items]
Financed construction costs of an interchange project		$ 240,000,000.0
Design and construction costs, amount in excess of maximum		$ 240,000,000.0
Los Angeles County
Lessee, Lease, Description [Line Items]
Financed construction costs of an interchange project								$ 45,800,000
Aggregate payments for infrastructure project				37,000,000.0
Los Angeles County | Accounts Payable and Other Liabilities
Lessee, Lease, Description [Line Items]
Construction Payable				8,900,000	$ 7,600,000
Los Angeles County | Accounts Payable and Other Liabilities | Forecast
Lessee, Lease, Description [Line Items]
Construction Payable							$ 8,900,000
The San Francisco Venture
Lessee, Lease, Description [Line Items]
Guaranty of infrastructure obligations, maximum obligation				$ 197,800,000
The San Francisco Venture | Five Point Operating Company, LLC | Common Class A
Lessee, Lease, Description [Line Items]
Stock issued (in shares)	436,498	436,498
The San Francisco Venture | Corporate Joint Venture | Five Point Operating Company, LLC | Common Class B
Lessee, Lease, Description [Line Items]
Price per share sold (in usd per share)		$ 0.00633
The San Francisco Venture | Corporate Joint Venture | Five Point Operating Company, LLC | Common Class A
Lessee, Lease, Description [Line Items]
Stock issued (in shares)		2,917,827
Water Purchase Agreement
Lessee, Lease, Description [Line Items]
Purchase agreement term				35 years
Purchase agreement optional second term				35 years
Payment made in current year				$ 1,200,000
Payment made in 2020				1,300,000
Payment made in 2021				1,300,000
Payment made in 2022				1,400,000
Payment made in 2023				1,400,000
Payments made after 2023				1,400,000
Aggregate annual minimum payments remaining				$ 35,100,000