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Derivatives, Hedges, Financial Instruments and Carbon Credits - Additional Information (Detail) (USD $) | 6 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2014 Unit MMBTU | Dec. 31, 2013 Unit MMBTU | Feb. 28, 2011
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Contractual weighted-average cost | 4.21 | 3.98 |
Estimated weighted-average market value | 4.22 |  |
Contractual weighted-average pay rate | 3.23% |  |
Estimated market weighted-average receive rate | 0.47% |  |
Carbon credit fair value per unit | 2.50 | 1.00 |
Derivative future or forward contracts in volume | 13,041,000 | 1,530,000 |
The month future or forward natural gas contract period ends | 2016-06 | 2014-10 |
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 | $ 30,000,000 | $ 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 | $ 106.5 | $ 104.5 |
Notes higher range of ask or bid price | $ 107.5 | $ 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 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 Weighted average cost per MMbtu of future or forward natural gas contract. + References No definition available. + Details
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- Definition Weighted average prices used to estimate reserves. + 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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