Business Segments - Schedule of Identifiable Net Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024
Segment Reporting Information [Line Items]
Identifiable net assets	$ 722,782	$ 728,485
Operating segments | Industrial and commercial
Segment Reporting Information [Line Items]
Identifiable net assets	62,571	37,527
Operating segments | Mining royalty lands
Segment Reporting Information [Line Items]
Identifiable net assets	47,757	47,527
Operating segments | Development
Segment Reporting Information [Line Items]
Identifiable net assets	117,587	144,832
Operating segments | Multifamily
Segment Reporting Information [Line Items]
Identifiable net assets	337,760	347,172
Cash items
Segment Reporting Information [Line Items]
Identifiable net assets	154,433	149,935
Unallocated corporate assets
Segment Reporting Information [Line Items]
Identifiable net assets	$ 2,674	$ 1,492