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Property, Plant and Equipment, Net - Schedule of Net Property, Plant and Equipment (Detail) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 419,560	$ 414,230
Less: accumulated depreciation and depletion	173,030	159,138
Total property, plant and equipment, net	246,530	255,092
Machinery, equipment and tooling
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	42,434	40,632
SmartSystems
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	31,127	30,651
Vehicles
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	4,225	4,082
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	1,479	1,466
Plant and building
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	216,460	213,756
Real estate properties
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	7,209	7,209
Railroad and sidings
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	35,719	35,491
Land and land improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	40,528	40,519
Asset retirement obligations
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	22,910	22,910
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	3,906	3,802
Construction in progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 6,121	$ 6,270

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Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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