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Property, Plant and Equipment, Net - Schedule of Net Property, Plant and Equipment (Detail) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 239,566	$ 198,569
Less: accumulated depreciation and depletion	29,529	26,367
Total property, plant and equipment, net	210,037	172,202
Machinery, equipment and tooling
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	10,529	8,242
Vehicles
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	1,544	1,546
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	730	720
Plant and building
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	83,057	81,561
Real estate properties
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	4,432	4,432
Railroad and sidings
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	25,286	10,254
Land improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	23,156	16,378
Asset retirement obligation
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	8,657	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	657	657
Construction in progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 71,639	$ 56,493

X

- Definition

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

+ References

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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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