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Property, Plant and Equipment, Net - Schedule of Net Property, Plant and Equipment (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	$ 198,569	$ 123,477
Less: accumulated depreciation and depletion	26,367	19,381
Total property, plant and equipment, net	172,202	104,096
Machinery, Equipment and Tooling
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	8,242	4,841
Vehicles
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	1,546	953
Furniture and Fixtures
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	720	305
Plant and Building
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	81,561	64,390
Real Estate Properties
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	4,432	3,503
Railroad and Sidings
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	10,254	7,927
Land and Improvements
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	16,378	13,317
Asset Retirement Obligation
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	8,408	1,324
Mineral Properties
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	9,878	9,785
Deferred Mining Costs
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	657	417
Construction in Progress
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	$ 56,493	$ 16,715

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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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