Segment Reporting - Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019	Jun. 30, 2019
Segment Reporting Information [Line Items]
Assets	$ 2,908,303	$ 3,004,700
Add investment balance	469,564	533,239
Great Park
Segment Reporting Information [Line Items]
Assets	1,092,295		$ 1,196,258
Add investment balance	396,964	431,835	431,835
Gateway Commercial Venture
Segment Reporting Information [Line Items]
Assets	405,259		473,398
Add investment balance	72,600	101,404	$ 101,404
Operating Segments
Segment Reporting Information [Line Items]
Assets	3,705,058	3,774,989
Other eliminations
Segment Reporting Information [Line Items]
Assets	(16,665)	(8,310)
Corporate and Unallocated
Segment Reporting Information [Line Items]
Assets	247,900	374,438
Valencia | Operating Segments
Segment Reporting Information [Line Items]
Assets	833,134	748,082
San Francisco | Operating Segments
Segment Reporting Information [Line Items]
Assets	1,213,156	1,197,081
Great Park | Operating Segments
Segment Reporting Information [Line Items]
Assets	1,253,477	1,356,417
Great Park | Removal of Results of Unconsolidated Entities
Segment Reporting Information [Line Items]
Assets	(1,092,295)	(1,196,258)
Commercial | Operating Segments
Segment Reporting Information [Line Items]
Assets	405,291	473,409
Gateway Commercial Venture | Removal of Results of Unconsolidated Entities
Segment Reporting Information [Line Items]
Assets	$ (405,259)	$ (473,398)