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

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.

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No definition available.

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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 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.

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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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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.

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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
-Paragraph 2
-Subparagraph (bb)
-URI http://asc.fasb.org/extlink&oid=66048111&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=64837297&loc=SL5624163-113959

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- Definition

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

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Derivatives, Hedges, Financial Instruments and Carbon Credits - Additional Information (Detail)	6 Months Ended	12 Months Ended
	Jun. 30, 2016 USD ($) $ / shares $ / MMBTU $ / Transaction $ / € shares	Dec. 31, 2015 $ / shares $ / MMBTU shares	Jun. 30, 2016 EUR (€) $ / Transaction $ / €	Dec. 31, 2015 EUR (€) MMBTU Unit $ / Transaction	Feb. 28, 2011 USD ($)
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Contractual weighted-average cost \| $ / MMBTU	2.97	2.35
Estimated weighted-average market value \| $ / MMBTU	3.05
Contractual weighted-average exchange rate \| $ / €	1.12		1.12
Carbon credit fair value per unit \| $ / Transaction	2.35		2.35	2.35
Derivative future or forward contracts in volume \| MMBTU				1,820,000
The month future or forward natural gas contract period ends		2016-12
Amount of foreign currency contract \| €			€ 100,000	€ 280,000
Future or forward foreign exchange contracts settlement period	2017-02	2017-02
LIBOR rate					3.23%
Interest rate contracts fixed rate description	fixed three-month LIBOR rate of 3.23% on a declining balance
Interest rate swap declining balance beginning balance					$ 23,800,000
Interest rate swap declining balance ending balance					$ 18,800,000
Maturity period interest rate contracts held	Mar. 31, 2016
Number of carbon credits \| Unit				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
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 \| $ / €	1.11
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	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	$ 12.08	$ 7.25