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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The number of carbon credit units held by the entity subject to contractual obligations.

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Contractual weighted average pay rate related to the entity's interest rate contracts as of the balance sheet date.

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No definition available.

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The quantity of derivative future or forward contract(s) measured in ounces.

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No definition available.

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The volume of derivative future or forward contract(s) as of the period end.

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Derivative future or forward foreign exchange contract period.

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The period derivative future or forward platinum contract(s) settle.

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Estimated market weighted average receive rate related to the entity's interest rate contracts as of the balance sheet date.

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Fair value measurement with inputs reconciliation recurring basis asset transfers in out of level one and level two.

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No definition available.

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- Definition

The period derivative future or forward copper contract(s) settle.

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The description of the fixed interest rate for a interest rate contract held as of the period end.

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No definition available.

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The minimum amount of a interest rate swap declining balance as of the period end.

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The maturity date of a interest rate contract held as of the period end.

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- Definition

The period derivative future or forward natural gas contract(s) settle.

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- Definition

The preferred stock participation rights in dividends and liquidating distributions expressed in the aggregated number of shares of common stock.

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No definition available.

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- Definition

The weighted average cost per MMBtu of future or forward natural gas contract as of the period end.

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No definition available.

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Weighted average cost per ounce of future or forward platinum contract.

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Weighted average exchange rate during period.

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The weighted average market value per MMBtu of future or forward natural gas contracts as of the period end.

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No definition available.

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- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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- Definition

Fixed interest rate related to the interest rate derivative.

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No definition available.

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- Definition

Contractual rate at which a foreign currency can be purchased or sold.

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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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Amount of transfers of assets measured on a recurring basis out of Level 1 of the fair value hierarchy into Level 2.

+ 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 (bb)
-URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258

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Amount of transfers of assets measured on a recurring basis out of Level 2 of the fair value hierarchy into Level 1.

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Amount of transfers of liabilities measured on a recurring basis out of Level 1 of the fair value hierarchy into Level 2.

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Amount of transfers of liabilities measured on a recurring basis out of Level 2 of the fair value hierarchy into Level 1.

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- Definition

Fair value as of the balance sheet date of all foreign currency derivatives designated as cash flow hedging instruments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4B
-Subparagraph (a),(b),(c)(1)
-URI http://asc.fasb.org/extlink&oid=56946850&loc=SL5624163-113959

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Price of a single share of a number of saleable stocks of a company.

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No definition available.

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Derivatives, Hedges, Financial Instruments and Carbon Credits - Additional Information (Detail)	12 Months Ended
	Dec. 31, 2015 USD ($) MMBTU Unit oz $ / shares $ / MMBTU $ / Transaction $ / € shares	Dec. 31, 2014 EUR (€) MMBTU Unit oz $ / MMBTU $ / Transaction $ / oz $ / €	Dec. 31, 2013 USD ($)	Dec. 31, 2015 EUR (€) MMBTU Unit oz $ / Transaction $ / €	Feb. 28, 2011 USD ($)
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Contractual weighted-average cost \| $ / MMBTU	2.35	3.24
Estimated weighted-average market value \| $ / MMBTU	2.35
Contractual weighted-average exchange rate \| $ / €	1.12	1.27		1.12
Contractual weighted-average pay rate	3.23%
Estimated market weighted-average receive rate	0.61%
Carbon credit fair value per unit \| $ / Transaction	2.35	2.50		2.35
Derivative future or forward contracts in volume \| MMBTU	1,820,000	8,279,000		1,820,000
Future or forward copper contracts period		2015-05
The month future or forward natural gas contract period ends	2016-12	2016-06
Future or forward contract in ounces \| oz	0	3,000		0
Future or forward platinum contracts settlement period		2015-04
Weighted-average cost per ounce of future or forward platinum contracts \| $ / oz		1,224.26
Amount of foreign currency contract \| €		€ 819,000		€ 280,000
Future or forward foreign exchange contracts settlement period	2017-02	2015-05
LIBOR rate					3.23%
Interest rate swap declining balance beginning balance					$ 23,800,000
Interest rate swap declining balance ending balance					$ 18,800,000
Interest rate contracts fixed rate description	fixed three-month LIBOR rate of 3.23% on a declining balance
Maturity period interest rate contracts held	Mar. 31, 2016
Number of carbon credits \| Unit	495,000	1,112,000		495,000
Assets measured at fair value on a recurring basis transferred between Level 1 and Level 2 classifications	$ 0
Assets measured at fair value on a recurring basis transferred between Level 2 and Level 1 classifications	0
Liabilities measured at fair value on a recurring basis transferred between Level 1 and Level 2 classifications	0
Liabilities measured at fair value on a recurring basis transferred between Level 2 and Level 1 classifications	$ 0
Assets or liabilities measured at fair value on a recurring basis transferred between Level 1 and Level 2 classifications			$ 31,000
12% Senior Secured Notes [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Debt instrument, interest rate	12.00%			12.00%
7.75% Senior Secured Notes [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Debt instrument, interest rate	7.75%			7.75%
Foreign Exchange Contracts [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Contractual weighted-average exchange rate \| $ / €	1.12			1.12
Total estimated market weighted-average exchange rate \| $ / €	1.09
Embedded Derivative [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Participating right in dividends and liquidating distributions expressed in number of common shares \| shares	456,225
Embedded Derivative [Member] \| Common Stock Shares [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Market price of common stock per share \| $ / shares	$ 7.25