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Property, Plant and Equipment, Net - Schedule of Net Property, Plant and Equipment (Detail) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 424,865	$ 421,358
Less: accumulated depreciation and depletion	191,520	184,666
Total property, plant and equipment, net	233,345	236,692
Machinery, equipment and tooling
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	44,188	43,041
SmartSystems
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	32,583	32,551
Vehicles
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	4,161	3,961
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	1,420	1,368
Plant and building
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	219,398	218,546
Real estate properties
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	7,187	7,161
Railroad and sidings
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	35,728	35,728
Land and land improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	40,627	40,627
Asset retirement obligations
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	23,283	23,283
Mineral properties
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	7,442	7,442
Deferred mining costs
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	4,463	4,434
Construction in progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 4,385	$ 3,216

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