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Property, Plant and Equipment, Net - Schedule of Net Property, Plant and Equipment (Detail) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 393,271	$ 372,363
Less: accumulated depreciation and depletion	122,678	109,898
Total property, plant and equipment, net	270,593	262,465
Machinery, equipment and tooling
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	32,993	30,813
SmartSystems
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	27,534	27,343
Vehicles
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	3,199	3,066
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	1,336	1,325
Plant and building
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	200,129	199,958
Real estate properties
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	6,507	6,496
Railroad and sidings
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	33,622	27,703
Land and land improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	40,172	35,652
Asset retirement obligation
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	28,818	20,536
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	2,455	2,455
Construction in progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 9,064	$ 9,574

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