Schedule III—Real Estate and Accumulated Depreciation - Schedule of Real Estate and Accumulated Depreciation (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	$ 4,882
Initial Cost
Initial Cost, Land	1,197,815
Initial Cost, Buildings and Improvements	5,138
Costs Capitalized Subsequent to Acquisition
Costs Capitalized Subsequent to Acquisition, Land	257,805
Costs Capitalized Subsequent to Acquisition, Buildings and Improvements	439
Gross Amounts at Which Carried at Close of Period
Gross Amounts at Which Carried at Close of Period, Land	1,455,620
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements	5,577
Gross Amounts at Which Carried at Close of Period, Total	1,461,197	$ 1,395,698	$ 294,777	$ 254,304
Accumulated Depreciation	3,407	$ 2,943	$ 2,442	$ 1,992
Aggregate cost of land and improvements for federal income tax purposes	2,000,000
Newhall Ranch-Land under development
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	4,803
Initial Cost
Initial Cost, Land	111,172
Initial Cost, Buildings and Improvements	0
Costs Capitalized Subsequent to Acquisition
Costs Capitalized Subsequent to Acquisition, Land	247,264
Costs Capitalized Subsequent to Acquisition, Buildings and Improvements	0
Gross Amounts at Which Carried at Close of Period
Gross Amounts at Which Carried at Close of Period, Land	358,436
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements	0
Gross Amounts at Which Carried at Close of Period, Total	358,436
Accumulated Depreciation	0
San Francisco Shipyard and Candlestick Point
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost
Initial Cost, Land	1,038,154
Initial Cost, Buildings and Improvements	0
Costs Capitalized Subsequent to Acquisition
Costs Capitalized Subsequent to Acquisition, Land	25,795
Costs Capitalized Subsequent to Acquisition, Buildings and Improvements	0
Gross Amounts at Which Carried at Close of Period
Gross Amounts at Which Carried at Close of Period, Land	1,063,949
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements	0
Gross Amounts at Which Carried at Close of Period, Total	1,063,949
Accumulated Depreciation	0
Agriculture-Operating property
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost
Initial Cost, Land	40,634
Initial Cost, Buildings and Improvements	1,114
Costs Capitalized Subsequent to Acquisition
Costs Capitalized Subsequent to Acquisition, Land	(13,477)
Costs Capitalized Subsequent to Acquisition, Buildings and Improvements	1,418
Gross Amounts at Which Carried at Close of Period
Gross Amounts at Which Carried at Close of Period, Land	27,157
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements	2,532
Gross Amounts at Which Carried at Close of Period, Total	29,689
Accumulated Depreciation	1,507
TPC Golf Course-Operating Property Held for Sale
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	79
Initial Cost
Initial Cost, Land	4,707
Initial Cost, Buildings and Improvements	4,024
Costs Capitalized Subsequent to Acquisition
Costs Capitalized Subsequent to Acquisition, Land	(2,136)
Costs Capitalized Subsequent to Acquisition, Buildings and Improvements	(979)
Gross Amounts at Which Carried at Close of Period
Gross Amounts at Which Carried at Close of Period, Land	2,571
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements	3,045
Gross Amounts at Which Carried at Close of Period, Total	5,616
Accumulated Depreciation	1,900
Other Properties
SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]
Encumbrances	0
Initial Cost
Initial Cost, Land	3,148
Initial Cost, Buildings and Improvements	0
Costs Capitalized Subsequent to Acquisition
Costs Capitalized Subsequent to Acquisition, Land	359
Costs Capitalized Subsequent to Acquisition, Buildings and Improvements	0
Gross Amounts at Which Carried at Close of Period
Gross Amounts at Which Carried at Close of Period, Land	3,507
Gross Amounts at Which Carried at Close of Period, Buildings and Improvements	0
Gross Amounts at Which Carried at Close of Period, Total	3,507
Accumulated Depreciation	$ 0