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Property, Plant and Equipment, Net - Schedule of Net Property, Plant and Equipment (Detail) - USD ($)
$ in Thousands
Sep. 30, 2022
Dec. 31, 2021
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 396,040 $ 372,363
Less: accumulated depreciation and depletion 128,830 109,898
Total property, plant and equipment, net 267,210 262,465
Machinery, equipment and tooling    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 34,411 30,813
SmartSystems    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 27,654 27,343
Vehicles    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 3,234 3,066
Furniture and fixtures    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 1,345 1,325
Plant and building    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 200,373 199,958
Real estate properties    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 6,523 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 40,455 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 $ 9,708 $ 9,574