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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The fair value per carbon credit unit as of the balance sheet date.

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- Definition

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

+ References

No definition available.

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- Definition

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

+ References

No definition available.

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- Definition

The derivative future or forward contract(s) measured in pounds as of the period end.

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No definition available.

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- Definition

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

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No definition available.

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- Definition

Derivative future or forward foreign exchange contract period.

+ References

No definition available.

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- Definition

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

+ References

No definition available.

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- Definition

Estimated market weighted average receive 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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- Definition

Excess of carrying value over estimated fair value.

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No definition available.

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Excess Of Estimated Fair Value Over Carrying Value

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- Definition

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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No definition available.

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- Definition

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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- Definition

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

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- Definition

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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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.

+ References

No definition available.

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- Definition

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

+ References

No definition available.

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The weighted average cost per pound of future or forward copper contract(s) as of the period end.

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No definition available.

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- Definition

Weighted Average Exchange Rate During Period

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- Definition

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

+ References

No definition available.

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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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- 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.

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- Definition

Price at which a dealer is willing to buy an instrument, 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)

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

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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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Derivatives, Hedges, Financial Instruments and Carbon Credits - Additional Information (Detail)	9 Months Ended	12 Months Ended
	Sep. 30, 2015 USD ($) MMBTU Unit lb oz $ / shares $ / Transaction $ / MMBTU $ / €	Dec. 31, 2014 USD ($) MMBTU Unit lb oz $ / shares $ / Transaction $ / MMBTU $ / lb $ / oz $ / €	Sep. 30, 2015 EUR (€) MMBTU Unit lb oz $ / Transaction $ / €	Dec. 31, 2014 EUR (€) MMBTU Unit lb oz $ / Transaction $ / €	Feb. 28, 2011 USD ($)
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Contractual weighted-average cost \| $ / MMBTU	2.93	3.24
Estimated weighted-average market value \| $ / MMBTU	2.65
Contractual weighted-average exchange rate \| $ / €	1.12	1.27	1.12	1.27
Contractual weighted-average pay rate	3.23%
Estimated market weighted-average receive rate	0.38%
Carbon credit fair value per unit \| $ / Transaction	2.35	2.50	2.35	2.50
Derivative future or forward contracts in pounds \| lb	0	1,750,000	0	1,750,000
Derivative future or forward contracts in volume \| MMBTU	3,227,000	8,279,000	3,227,000	8,279,000
Future or forward copper contracts period		2015-05
Weighted-average cost per pound of future or forward copper contracts \| $ / lb		2.98
The month future or forward natural gas contract period ends	2016-06	2016-06
Future or forward contract in ounces \| oz	0	3,000	0	3,000
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 \| €			€ 293,000	€ 819,000
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	March 2016
Number of carbon credits \| Unit	84,000	1,112,000	84,000	1,112,000
Assets or liabilities measured at fair value on a recurring basis transferred between Level 1 and Level 2 classifications	$ 0
Senior Secured Notes [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Excess of estimated fair value over carrying value		$ 17,000,000
Excess of carrying value over estimated fair value	$ 15,000,000
Senior Secured Notes [Member] \| Significant Other Observable Inputs (Level 2) [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Notes based on quoted price \| $ / shares	$ 96.5	$ 104.0
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 \| $ / €	1.13