Basis of Presentation - Additional Information (Detail)	3 Months Ended	12 Months Ended
Mar. 31, 2017 USD ($) Project	Mar. 31, 2016 USD ($)	Dec. 31, 2016 USD ($)
Significant Accounting Policies [Line Items]
Number of projects suspended \| Project	2
Percentage of suspended projects relating to two projects	93.00%
Projects completed percentage	90.00%
Deferred tax assets, valuation allowance	$ 10,477,000
Restricted cash	11,792,000		$ 0
Lower of cost or market inventory adjustment	0	$ 0
Production cost	$ 11,212,000	9,707,000
Impairment charge related to manufacturing plant asset groups			$ 0
Bauxite raw materials
Significant Accounting Policies [Line Items]
Impairment of long-term portion of the bauxite raw material		$ 1,065,000

Number of Projects Terminated

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Percentage Of Projects Completion

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Percentage of suspended projects

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No definition available.

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Significant Accounting Policies [Line Items]

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No definition available.

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- Definition

Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 45
-Paragraph 4
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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Amount of loss from reductions in inventory due to subsequent measurement adjustments, including, but not limited to, physical deterioration, obsolescence, or changes in price levels.

+ References

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The accumulated decrease in the carrying value of the mineral properties as a result of adjustments in estimates of future income generating potential of the mineral property.

+ References

No definition available.

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- Definition

The capitalized costs incurred during the period (excluded from amortization) to operate and maintain wells and related equipment and facilities, including depreciation and applicable operating costs of support equipment and facilities and other costs of operating and maintaining those wells and related equipment and facilities. They become part of the cost of oil and gas produced. Examples of production costs (sometimes called lifting costs) are: costs of labor to operate the wells and related equipment and facilities; repairs and maintenance; materials, supplies, and fuel consumed and supplies utilized in operating the wells and related equipment and facilities; property taxes and insurance applicable to proved properties and wells and related equipment and facilities; severance taxes; some support equipment or facilities may serve two or more oil and gas producing activities and may also serve transportation, refining, and marketing activities. To the extent that the support equipment and facilities are used in oil and gas producing activities, their depreciation and applicable operating costs become exploration, development or production costs, as appropriate. Depreciation, depletion, and amortization of capitalized acquisition, exploration, and development costs are not production costs but also become part of the cost of oil and gas produced along with production (lifting) costs identified above.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
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The carrying amounts of cash and cash equivalent items which are restricted as to withdrawal or usage. Restrictions may include legally restricted deposits held as compensating balances against borrowing arrangements, contracts entered into with others, or entity statements of intention with regard to particular deposits; however, time deposits and short-term certificates of deposit are not generally included in legally restricted deposits. Excludes compensating balance arrangements that are not agreements which legally restrict the use of cash amounts shown on the balance sheet. This element is for unclassified presentations; for classified presentations there is a separate and distinct element.

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