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Property, Plant and Equipment, Net - Schedule of Net Property, Plant and Equipment (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2025
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 440,775		$ 435,469
Less: accumulated depreciation and depletion	218,414		212,215
Total property, plant and equipment, net	222,361		223,254
Depreciation expenses	7,220	$ 6,998
Machinery, equipment and tooling
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	50,736		48,865
SmartSystems
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	33,439		32,583
Vehicles
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	4,304		4,261
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	1,420		1,420
Plant and buildings
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	223,501		223,104
Real estate properties
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	7,760		7,738
Railroad and sidings
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	36,677		36,677
Land and land improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	40,627		40,627
Asset retirement obligations
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	23,454		23,454
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	7,428		6,757
Construction in progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 3,987		$ 2,541