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Business segments - Schedule of Identifiable Net Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Segment Reporting Information [Line Items]
Identifiable net assets	$ 717,123	$ 728,485
Cash items
Segment Reporting Information [Line Items]
Identifiable net assets	143,634	149,935
Unallocated corporate assets
Segment Reporting Information [Line Items]
Identifiable net assets	1,828	1,492
Industrial and commercial | Operating Segments
Segment Reporting Information [Line Items]
Identifiable net assets	37,198	37,527
Mining royalty lands | Operating Segments
Segment Reporting Information [Line Items]
Identifiable net assets	47,506	47,527
Development | Operating Segments
Segment Reporting Information [Line Items]
Identifiable net assets	144,538	144,832
Multifamily | Operating Segments
Segment Reporting Information [Line Items]
Identifiable net assets	$ 342,419	$ 347,172

X

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Amount of asset recognized for present right to economic benefit.

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