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Derivatives, Hedges, Financial Instruments and Carbon Credits - Additional Information (Detail) | 12 Months Ended |  |
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Dec. 31, 2015 USD ($) $ / shares $ / MMBTU $ / € shares | Dec. 31, 2014 EUR (€) MMBTU Unit lb oz $ / MMBTU $ / Transaction $ / lb $ / oz $ / € | Dec. 31, 2013 USD ($) | Dec. 31, 2015 EUR (€) MMBTU Unit lb oz $ / Transaction $ / € | Feb. 28, 2011 USD ($)
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |
Contractual weighted-average cost | $ / MMBTU | 2.35 | 3.24 |  |  |
Estimated weighted-average market value | $ / MMBTU | 2.35 |  |  |  |
Contractual weighted-average exchange rate | $ / € |  | 1.27 |  | 1.12 |
Contractual weighted-average pay rate | 3.23% |  |  |  |
Estimated market weighted-average receive rate | 0.61% |  |  |  |
Carbon credit fair value per unit | $ / Transaction |  | 2.50 |  | 2.35 |
Derivative future or forward contracts in pounds | lb |  | 1,750,000 |  | 0 |
Derivative future or forward contracts in volume | MMBTU |  | 8,279,000 |  | 1,820,000 |
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 | 2016-12 | 2016-06 |  |  |
Future or forward contract in ounces | oz |  | 3,000 |  | 0 |
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 | € |  | € 819,000 |  | € 280,000 |
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 |  | 1,112,000 |  | 495,000 |
Assets or liabilities measured at fair value on a recurring basis transferred between Level 1 and Level 2 classifications | $ | $ 0 |  | $ 31,000 |  |
12% Senior Secured Notes [Member] |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |
Debt instrument, interest rate |  |  |  | 12.00% |
7.75% Senior Secured Notes [Member] |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |
Debt instrument, interest rate |  |  |  | 7.75% |
Foreign Exchange Contracts [Member] |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |
Contractual weighted-average exchange rate | $ / € |  |  |  | 1.12 |
Total estimated market weighted-average exchange rate | $ / € | 1.09 |  |  |  |
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 |  |  |  |
Embedded Derivative [Member] | Common Stock Shares [Member] |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |
Market price of common stock per share | $ / shares | $ 7.25 |  |  |  |

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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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