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Property, Plant and Equipment, Net - Schedule of Net Property, Plant and Equipment (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	$ 123,477	$ 121,986
Less: accumulated depreciation and depletion	19,381	13,058
Total property, plant and equipment, net	104,096	108,928
Machinery, Equipment and Tooling
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	4,841	4,673
Vehicles
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	953	952
Furniture and Fixtures
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	305	303
Plant and Building
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	64,390	64,001
Real Estate Properties
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	3,503	3,500
Railroad and Sidings
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	7,927	7,868
Land and Improvements
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	13,317	12,977
Asset Retirement Obligation
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	1,324	1,135
Mineral Properties
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	9,785	9,785
Deferred Mining Costs
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	417	155
Construction in Progress
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	$ 16,715	$ 16,637

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

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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