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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, 2013 CreditFacility lb | Dec. 31, 2012 lb
Contractual weighted-average pay rate |  | 3.23% |
Estimated market weighted-average receive rate |  | 0.51% |
Carbon credit fair value per unit |  | 0.50 | 0.50
Derivative future or forward contract in pounds |  | 625,000 | 625,000
Weighted-average cost per pound of future or forward copper contracts |  | $ 3.53 | $ 3.53
Future or forward copper contract period |  | May 2013 | May 2013
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 |  | 625,000 |
Assets or liabilities measured at fair value on a recurring basis transferred between Level 1 and Level 2 classifications |  |  |

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