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Property, Plant and Equipment, Net - Schedule of Net Property, Plant and Equipment (Detail) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015	Dec. 31, 2014
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	$ 123,047	$ 121,986	$ 93,614
Less: accumulated depreciation and depletion	17,752	13,058	7,799
Total property, plant and equipment, net	105,295	108,928	85,815
Machinery, Equipment and Tooling
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	4,809	4,673	4,011
Vehicles
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	953	952	733
Furniture and Fixtures
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	303	303	206
Plant and Building
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	64,387	64,001	43,785
Real Estate Properties
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	3,504	3,500	2,131
Railroad and Sidings
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	7,920	7,868	7,193
Land and Improvements
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	13,317	12,977	9,132
Asset Retirement Obligation
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	1,135	1,135	1,748
Mineral Properties
Property Plant And Equipment [Line Items]
Property, plant and equipment, gross	9,785	9,785	9,734
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	$ 16,517	$ 16,637	$ 14,941

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.

+ References

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

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