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Property, Plant and Equipment, net - Schedule of Net Property, Plant and Equipment (Detail) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 393,797 $ 372,363
Less: accumulated depreciation and depletion 134,954 109,898
Total property, plant and equipment, net 258,843 262,465
Machinery, equipment and tooling    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 36,483 30,813
SmartSystems    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 28,376 27,343
Vehicles    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 3,835 3,066
Furniture and fixtures    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 1,421 1,325
Plant and building    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 200,480 199,958
Real estate properties    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 6,155 6,496
Railroad and sidings    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 33,698 27,703
Land and land improvements    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 40,433 35,652
Asset retirement obligation    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 22,583 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 2,470 2,455
Construction in progress    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 10,421 $ 9,574