Amount of accumulated depreciation, depletion, and amortization of property, plant, and equipment. Includes, but is not limited to, land and land improvement; building; machinery and equipment; furniture and fixture; and work of art, historical treasure, or similar asset classified as collection.

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

- Definition

Amount, after accumulated depreciation, depletion, and amortization, of property, plant, and equipment. Includes, but is not limited to, land and land improvement; building; machinery and equipment; furniture and fixture; and work of art, historical treasure, or similar asset classified as collection.

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+ Details

Property, plant and equipment - Schedule Of Property, Plant And Equipment (Details) - USD ($) $ in Thousands	Jun. 30, 2026	Dec. 31, 2025	Dec. 31, 2024
Property, Plant, and Equipment [Line Items]
Less: Accumulated depreciation	$ (76,391)	$ (67,372)
Property, plant and equipment, net	$ 197,673	200,818
HMH Holding BV And Subsidiaries [Member]
Property, Plant, and Equipment [Line Items]
Property plant and equipment gross		268,190	$ 240,777
Less: Accumulated depreciation		(67,372)	(42,093)
Property, plant and equipment, net		200,818	198,684
HMH Holding BV And Subsidiaries [Member] \| Buildings and land [Member]
Property, Plant, and Equipment [Line Items]
Property plant and equipment gross		162,275	151,638
HMH Holding BV And Subsidiaries [Member] \| Machinery, equipment and software [Member]
Property, Plant, and Equipment [Line Items]
Property plant and equipment gross		102,600	85,822
HMH Holding BV And Subsidiaries [Member] \| Asset under Construction [Member]
Property, Plant, and Equipment [Line Items]
Property plant and equipment gross		$ 3,315	$ 3,317