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Property, Plant and Equipment, Net - Schedule of Net Property, Plant and Equipment (Detail) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 419,568	$ 414,230
Less: accumulated depreciation and depletion	177,679	159,138
Total property, plant and equipment, net	241,889	255,092
Machinery, equipment and tooling
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	41,832	40,632
SmartSystems
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	32,299	30,651
Vehicles
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	3,800	4,082
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	1,368	1,466
Plant and building
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	218,055	213,756
Real estate properties
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	6,980	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	40,704	40,519
Asset retirement obligations
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	22,910	22,910
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	3,838	3,802
Construction in progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 4,612	$ 6,270

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