Noncontrolling Interests (Details) $ in Thousands, shares in Millions	1 Months Ended	9 Months Ended		12 Months Ended
	Jan. 31, 2020 USD ($)	Sep. 30, 2020 USD ($) class	Sep. 30, 2019 USD ($)	Dec. 31, 2019 USD ($) shares
Noncontrolling Interest [Line Items]
Holding period for right to exchange		12 months
Right to exchange, conversion ratio		1
Tax distribution to noncontrolling interest		$ 4,568	$ 0
Proceeds from issuance of redeemable noncontrolling interest		0	$ 25,000
Redeemable noncontrolling interest, common stock class C units		$ 25,000
San Francisco Venture
Noncontrolling Interest [Line Items]
Issuance of Class C common shares (in shares) | shares				25.0
Proceeds from issuance of redeemable noncontrolling interest				$ 25,000
Maximum amount payable, class C units				25,000
Infrastructure development costs				25,000
San Francisco Venture | Maximum
Noncontrolling Interest [Line Items]
Authorized contribution amount				$ 25,000
The San Francisco Venture
Noncontrolling Interest [Line Items]
Holding period for right to exchange		12 months
Right to exchange, conversion ratio		1
Number of classes of membership units | class		3
Unitholder request for redemption, minimum ownership		50.10%
Conversion of Class B Common Shares Into Class A Common Shares
Noncontrolling Interest [Line Items]
Conversion of common shares, ratio		0.0003
Five Point Operating Company, LLC
Noncontrolling Interest [Line Items]
Noncontrolling interest percentage of outstanding common units		37.50%
Five Point Operating Company, LLC | Doni, Inc.
Noncontrolling Interest [Line Items]
Tax distribution to noncontrolling interest	$ 4,600
Five Point Operating Company, LLC | Class A Units | Affiliated Entity
Noncontrolling Interest [Line Items]
Ownership percentage of outstanding common units		62.50%
Five Point Operating Company, LLC | Class B Units | Affiliated Entity
Noncontrolling Interest [Line Items]
Ownership percentage of outstanding common units		100.00%