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Property, Plant and Equipment, Net - Schedule of Net Property, Plant and Equipment (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 360,162	$ 293,525
Less: accumulated depreciation and depletion	79,020	63,064
Total property, plant and equipment, net	281,142	230,461
Machinery, equipment and tooling
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	52,077	19,683
SmartSystems
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	22,393	15,811
Vehicles
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	2,938	2,419
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	1,284	1,228
Plant and building
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	176,731	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	32,956	21,320
Asset retirement obligation
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	19,904	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	$ 8,153	$ 9,208

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