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Property, Plant and Equipment, Net - Schedule of Net Property, Plant and Equipment (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 432,886		$ 432,886		$ 421,358
Less: accumulated depreciation and depletion	205,248		205,248		184,666
Total property, plant and equipment, net	227,638		227,638		236,692
Depreciation expenses	6,971	$ 6,946	20,995	$ 20,924
Machinery, equipment and tooling
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	47,305		47,305		43,041
SmartSystems
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	32,583		32,583		32,551
Vehicles
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	4,201		4,201		3,961
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	1,420		1,420		1,368
Plant and building
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	222,768		222,768		218,546
Real estate properties
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	7,726		7,726		7,161
Railroad and sidings
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	36,676		36,676		35,728
Land and land improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	40,627		40,627		40,627
Asset retirement obligations
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	23,283		23,283		23,283
Mineral properties
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	7,442		7,442		7,442
Deferred mining costs
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	6,067		6,067		4,434
Construction in progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 2,788		$ 2,788		$ 3,216

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Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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