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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
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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

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- Definition 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 -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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