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Property, Plant and Equipment, net - Schedule of Net Property, Plant and Equipment (Detail) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 414,230 $ 393,797
Less: accumulated depreciation and depletion 159,138 134,954
Total property, plant and equipment, net 255,092 258,843
Machinery, equipment and tooling    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 40,632 36,483
SmartSystems    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 30,651 28,376
Vehicles    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 4,082 3,835
Furniture and fixtures    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 1,466 1,421
Plant and buildings    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 213,756 200,480
Real estate properties    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 7,209 6,155
Railroad and sidings    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 35,491 33,698
Land and land improvements    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 40,519 40,433
Asset retirement obligation    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 22,910 22,583
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 3,802 2,470
Construction in progress    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 6,270 $ 10,421