Derivative and Other Financial Instruments and Fair Value Measurements - Additional Information (Detail) BTU in Millions	9 Months Ended	12 Months Ended
Sep. 30, 2015 USD ($) BTU t	Dec. 31, 2014
Derivative [Line Items]
Derivative contracts \| t	30,700
Cash collateral posted or held	$ 0
Amount subject to enforceable master netting arrangement not offset	$ 0
Redeemable Preferred Stock
Derivative [Line Items]
Preferred stock redemption period	66 months
Credit spread adjustment percentage	14.20%
Common Stock Warrant Liability
Derivative [Line Items]
Valuation technique	Monte Carlo Simulation
Volatility	50.00%	52.00%
Expected term	4 years 8 months 12 days	5 years 9 months 18 days
Equity raise probability	25.00%
Equity raise price discount assumption	15.00%
Percentage of increase decrease in unobservable inputs on estimated fair value of common stock warrant liability	10.00%
Currency Exchange Hedging
Derivative [Line Items]
Currency derivative contracts outstanding	$ 0
Natural Gas \| Swap Contract One
Derivative [Line Items]
Forward buy contracts \| BTU	2.1

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 12

-Section 13

-Sentence Column B

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- Definition

Amount of discount, in percentage terms, the Company will offer to raise equity through a Rights Offering.

+ References

No definition available.

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- Definition

Probability that the Company will raise equity through a Rights Offering.

+ References

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- Definition

Percentage of increase decrease in unobservable inputs on estimated fair value of common stock warrant liability.

+ References

No definition available.

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- Definition

Period, in months, before the instrument can be redeemed by the holder.

+ References

No definition available.

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- Definition

Tons of metal in forward contracts with the right to buy (in tons).

+ References

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- Definition

The aggregate fair value of assets that are already posted, at the end of the reporting period, as collateral for derivative instruments with credit-risk-related contingent features.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4H

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624258-113959

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Nominal energy measure used to calculate payments on a derivative instrument.

+ References

No definition available.

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- Definition

Period the instrument, asset or liability is expected to be outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (e)

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- Definition

Measure of dispersion, in percentage terms (for instance, the standard deviation or variance), for a given stock price.

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- Definition

Risk associated with risk of default, credit spread risk and downgrade risk, expressed as a percentage, used as an input to measure fair value.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (bbb)

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Description of the inputs and valuation technique(s) used to measure fair value.

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-Publisher FASB

-Name Accounting Standards Codification

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-SubTopic 10

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- Definition

Amount of securities loaned to entities in exchange for collateral, not subject to a master netting arrangement.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 20

-Section 50

-Paragraph 3

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 20

-Section 55

-Paragraph 22

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