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Summary of significant accounting policies - Computation of Depreciation of Property and Equipment (Detail)	Dec. 31, 2023
Buildings and improvements | Minimum [Member]
Property Plant And Equipment [Line Items]
Property and equipment useful life	10 years
Buildings and improvements | Maximum [Member]
Property Plant And Equipment [Line Items]
Property and equipment useful life	40 years
Machinery and equipment | Minimum [Member]
Property Plant And Equipment [Line Items]
Property and equipment useful life	3 years
Machinery and equipment | Maximum [Member]
Property Plant And Equipment [Line Items]
Property and equipment useful life	20 years
Mine development costs
Property Plant And Equipment [Line Items]
Property and equipment useful life	us-gaap:UnitsOfProductionDepreciationMethodMember

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- Definition

Indicates method of allocating cost over useful life in systematic and rational manner for property, plant, and equipment.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 360
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482099/360-10-50-1

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- 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.

+ References

No definition available.

+ Details

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- Definition

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

No definition available.

+ Details

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