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Derivatives, Hedges, Financial Instruments and Carbon Credits - Additional Information (Detail) (USD $) | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Feb. 28, 2011 | Mar. 31, 2014 Unit MMBTU | Dec. 31, 2013 Unit MMBTU
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Contractual weighted-average cost |  | 3.95 | 3.98
Estimated weighted-average market value |  | 4.29 |
Contractual weighted-average pay rate |  | 3.23% |
Estimated market weighted-average receive rate |  | 0.53% |
Carbon credit fair value per unit |  | 2.50 | 1.00
Derivative future or forward contracts in volume |  | 2,140,000 | 1,530,000
The month future or forward natural gas contract period ends |  | October 2014 | October 2014
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 |  | 669,000 | 1,284,000
Assets or liabilities measured at fair value on a recurring basis transferred between Level 1 and Level 2 classifications |  |  | 31,000
Senior Secured Notes [Member] |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Excess of estimated fair value over carrying value |  | $ 35,000,000 | $ 20,000,000
Senior Secured Notes [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Notes lower range of ask or bid price |  | $ 107.8 | $ 104.5
Notes higher range of ask or bid price |  | $ 108.8 | $ 104.9

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References 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 + Details
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- Definition The number of carbon credit units held by the entity subject to contractual obligations. + References No definition available. + Details
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- Definition The fair value per carbon credit unit as of the balance sheet date. + References No definition available. + Details
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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. + Details
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- Definition Derivative future or forward contract in volume. + References No definition available. + Details
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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. + References No definition available. + Details
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- Definition Excess Of Estimated Fair Value Over Carrying Value + References No definition available. + Details
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- Definition Fair value measurement with inputs reconciliation recurring basis asset transfers in out of level one and level two. + References No definition available. + Details
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- Definition Interest rate contracts fixed rate description. + References No definition available. + Details
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- Definition Interest rate swap declining balance minimum amount + References No definition available. + Details
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- Definition Maturity date of interest rate contract held. + References No definition available. + Details
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- Definition The month future or forward natural gas contract period ends. + References No definition available. + Details
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- Definition Notes Higher Range Of Ask Bid Prices + References No definition available. + Details
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- Definition Weighted average cost per pound of future or forward copper contract. + References No definition available. + Details
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- Definition Fixed interest rate related to the interest rate derivative. + References No definition available. + Details
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- Details
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