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Property, Plant and Equipment, net - Schedule of Net Property, Plant and Equipment (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Mar. 15, 2018
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 293,525	$ 291,205	$ 15,549
Less: accumulated depreciation and depletion	63,064	42,809
Total property, plant and equipment, net	230,461	248,396
Machinery, equipment and tooling
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	19,683	14,858	1,478
SmartSystems
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	15,811	5,286
Vehicles
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	2,419	1,955
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	1,228	1,140
Plant and building
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	170,283	158,882	1,407
Real estate properties
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	4,946	4,601
Railroad and sidings
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	27,701	27,347	$ 9,926
Land and land improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	21,320	27,167
Asset retirement obligation
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	11,480	16,469
Mineral properties
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	7,442	10,075
Deferred mining costs
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	2,004	1,806
Construction in progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 9,208	$ 21,619

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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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