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Property, Plant and Equipment, net - Schedule of Net Property, Plant and Equipment (Detail) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 421,358	$ 414,230
Less: accumulated depreciation and depletion	184,666	159,138
Total property, plant and equipment, net	236,692	255,092
Machinery, equipment and tooling
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	43,041	40,632
SmartSystems revenue
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	32,551	30,651
Vehicles
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	3,961	4,082
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	1,368	1,466
Plant and buildings
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	218,546	213,756
Real estate properties
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	7,161	7,209
Railroad and sidings
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	35,728	35,491
Land and land improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	40,627	40,519
Asset retirement obligation
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	23,283	22,910
Mineral properties
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	7,442	7,442
Deferred stripping costs
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	4,434	3,802
Construction in progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 3,216	$ 6,270

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