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Property, Plant and Equipment, Net - Schedule of Net Property, Plant and Equipment (Detail) - USD ($) $ in Thousands	Jun. 30, 2018	Mar. 15, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 257,527	$ 15,549	$ 198,129
Less: accumulated depreciation and depletion	33,534		26,367
Total property, plant and equipment, net	223,993		171,762
Machinery, equipment and tooling
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	11,791	1,478	7,802
Vehicles
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	1,671		1,546
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	760		720
Plant and building
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	143,622	1,407	81,561
Real estate properties
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	4,441		4,432
Railroad and sidings
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	25,691	$ 9,926	10,254
Land improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	25,870		16,378
Asset retirement obligation
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	10,493		8,408
Mineral properties
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	9,879		9,878
Deferred mining costs
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	782		657
Construction in progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 22,527		$ 56,493

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- Definition

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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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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