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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

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