Business Segments - Schedule of Identifiable Net Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2026	Dec. 31, 2025
Segment Reporting [Line Items]
Identifiable net assets	$ 762,313	$ 735,145
Operating segments \| Industrial and commercial
Segment Reporting [Line Items]
Identifiable net assets	61,662	62,260
Operating segments \| Mining royalty lands
Segment Reporting [Line Items]
Identifiable net assets	47,661	47,729
Operating segments \| Development
Segment Reporting [Line Items]
Identifiable net assets	227,233	187,237
Operating segments \| Multifamily
Segment Reporting [Line Items]
Identifiable net assets	321,441	329,303
Cash items
Segment Reporting [Line Items]
Identifiable net assets	100,975	105,361
Unallocated corporate assets
Segment Reporting [Line Items]
Identifiable net assets	$ 3,341	$ 3,255

Amount of asset recognized for present right to economic benefit.

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+ Details

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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+ Details