Investment In Unconsolidated Entities - Additional Information (Details) ft² in Thousands, $ in Thousands	1 Months Ended		3 Months Ended		9 Months Ended
	Aug. 31, 2020 USD ($) ft² building	May 31, 2020 USD ($) ft² a	Sep. 30, 2020 USD ($) numberOfHomesites individual	Sep. 30, 2019 USD ($)	Sep. 30, 2020 USD ($) numberOfHomesites individual	Sep. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)	Aug. 31, 2017 building
Schedule of Equity Method Investments [Line Items]
Revenue from customers			$ 8,065	$ 11,629	$ 41,012	$ 36,450
Number of buildings on campus			4		4			4
Acres of land sold | a		11
Carrying value of property			$ 33,018		$ 33,018		$ 32,312
Return on investment from Gateway Commercial Venture					78,968	0
Revenues			8,377	12,014	41,904	37,474
Land sales
Schedule of Equity Method Investments [Line Items]
Revenue from customers			42	9	17,076	74
Land sales | Affiliated Entity
Schedule of Equity Method Investments [Line Items]
Revenue from customers			$ 2	$ 229	$ 14	695
Great Park
Schedule of Equity Method Investments [Line Items]
Percentage of equity ownership			37.50%		37.50%
Distribution to certain interest holders, aggregate			$ 431,300		$ 431,300
Great Park | Land sales
Schedule of Equity Method Investments [Line Items]
Revenue from customers						98,700
Great Park | Land sales | Affiliated Entity
Schedule of Equity Method Investments [Line Items]
Other-than-temporary investment impairment					(26,900)
Revenue from customers					1,100	132,500
Great Park | Land sales | Third Parties
Schedule of Equity Method Investments [Line Items]
Revenue from customers					$ 22,000
Great Park | Homesites Sold
Schedule of Equity Method Investments [Line Items]
Revenue from customers						31,000
Gateway Commercial Venture
Schedule of Equity Method Investments [Line Items]
Number of buildings on campus | numberOfHomesites			1		1
Gateway Commercial Venture | Five Point Office Venture Holdings I, LLC Acquisition
Schedule of Equity Method Investments [Line Items]
Percentage of equity ownership			75.00%		75.00%
Number of individuals entitled to be appointed to executive committee | individual			2		2
Gateway Commercial Venture | Rental Revenue | Affiliated Entity
Schedule of Equity Method Investments [Line Items]
Revenues					$ 6,300	6,200
Great Park
Schedule of Equity Method Investments [Line Items]
Distributions entitled to be received					476,000
Potential additional distributions entitled to be received					$ 89,000
Percentage of equity ownership			37.50%		37.50%
Revenue from customers					$ 23,054	231,216
Great Park | Land sales | Affiliated Entity
Schedule of Equity Method Investments [Line Items]
Other-than-temporary investment impairment					$ (26,851)	0
Gateway Commercial Venture
Schedule of Equity Method Investments [Line Items]
Percentage of equity ownership			75.00%		75.00%
Revenue from customers					$ 22,141	25,708
Gain on asset sales, net					$ 112,260	$ 0
Gateway Commercial Venture | Gateway Commercial Venture | Five Point Office Venture Holdings I, LLC Acquisition
Schedule of Equity Method Investments [Line Items]
Number of buildings on campus | building	2
Acres of land sold | a		11
Area of building sold (in sq ft) | ft²	660	189
Purchase price	$ 355,000	$ 108,000
Carrying value of property	278,000	67,500
Gain on asset sales, net	74,800	37,400
Debt payment	245,000	30,000
Distribution made to members	107,000	75,000
Return on investment from Gateway Commercial Venture	$ 80,300	$ 56,300