Derivative and Other Financial Instruments and Fair Value Measurements - Additional Information (Detail) BTU in Trillions	12 Months Ended
Dec. 31, 2015 USD ($) BTU t	Dec. 31, 2014
Derivative [Line Items]
Derivative contracts \| t	24,600
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	17.50%
Maximum
Derivative [Line Items]
Estimated fair value of financing receivable outstanding on number of days	30 days
Common Stock Warrant Liability
Derivative [Line Items]
Valuation technique	Monte Carlo Simulation
Volatility	49.90%	52.00%
Expected term	4 years 4 months 24 days	5 years 9 months 18 days
Equity raise probability		25.00%
Equity raise probability in 2015	60.00%
Equity raise price discount assumption	15.00%	15.00%
Percentage of increase decrease in unobservable inputs on estimated fair value of common stock warrant liability	10.00%
Equity raise probability of weighted average price on volume days	10 days	10 days
Currency Exchange Hedging
Derivative [Line Items]
Currency derivative contracts outstanding	$ 0
Natural Gas \| Swap Contract One
Derivative [Line Items]
Forward buy contracts \| BTU	1.9

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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Carrying value of financing receivable outstanding within number of days.

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

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Fair value assumptions equity raise on weighted average price within number of days.

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

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Fair value assumptions equity raise probability in next twelve months

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

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

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- Definition

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

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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)
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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.

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

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

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

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
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Description of the inputs and valuation technique(s) used to measure fair value.

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