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Property, Plant and Equipment, Net - Schedule of Net Property, Plant and Equipment (Detail) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 389,532	$ 372,363
Less: accumulated depreciation and depletion	116,220	109,898
Total property, plant and equipment, net	273,312	262,465
Machinery, equipment and tooling
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	32,390	30,813
SmartSystems
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	27,544	27,343
Vehicles
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	3,173	3,066
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	1,329	1,325
Plant and building
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	200,099	199,958
Real estate properties
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	6,496	6,496
Railroad and sidings
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	33,591	27,703
Land and land improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	40,152	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	$ 6,043	$ 9,574

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