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Property, Plant and Equipment, net - Schedule of Net Property, Plant and Equipment (Detail) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 359,664	$ 293,525
Less: accumulated depreciation and depletion	84,988	63,064
Total property, plant and equipment, net	274,676	230,461
Machinery, equipment and tooling
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	29,002	19,683
SmartSystems
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	22,352	15,811
Vehicles
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	2,893	2,419
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	1,302	1,228
Plant and building
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	199,867	170,283
Real estate properties
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	6,458	4,946
Railroad and sidings
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	27,703	27,701
Land and land improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	33,040	21,320
Asset retirement obligation
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	19,993	11,480
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	2,123	2,004
Construction in progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 7,489	$ 9,208

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