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Derivatives, Hedges, Financial Instruments and Carbon Credits - Additional Information (Detail) | 6 Months Ended | 12 Months Ended |  |  |
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Jun. 30, 2015 USD ($) MMBTU Unit lb oz $ / shares $ / Transaction $ / MMBTU $ / lb $ / € | Dec. 31, 2014 USD ($) MMBTU Unit lb oz $ / shares $ / Transaction $ / MMBTU $ / lb $ / oz $ / € | Jun. 30, 2015 EUR (€) MMBTU Unit lb oz $ / Transaction $ / € | Dec. 31, 2014 EUR (€) MMBTU Unit lb oz $ / Transaction $ / € | Feb. 28, 2011 USD ($)
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |
Contractual weighted-average cost | $ / MMBTU | 3.09 | 3.24 |  |  |
Estimated weighted-average market value | $ / MMBTU | 2.92 |  |  |  |
Contractual weighted-average exchange rate | $ / € | 1.14 | 1.27 | 1.14 | 1.27 |
Contractual weighted-average pay rate | 3.23% |  |  |  |
Estimated market weighted-average receive rate | 0.41% |  |  |  |
Carbon credit fair value per unit | $ / Transaction | 2.35 | 2.50 | 2.35 | 2.50 |
Derivative future or forward contracts in pounds | lb | 1,950,000 | 1,750,000 | 1,950,000 | 1,750,000 |
Derivative future or forward contracts in volume | MMBTU | 4,655,000 | 8,279,000 | 4,655,000 | 8,279,000 |
Future or forward copper contracts period | 2015-12 | 2015-05 |  |  |
Weighted-average cost per pound of future or forward copper contracts | $ / lb | 2.77 | 2.98 |  |  |
The month future or forward natural gas contract period ends | 2016-06 | 2016-06 |  |  |
Future or forward contract in ounces | oz | 0 | 3,000 | 0 | 3,000 |
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 | € |  |  | € 280,000 | € 819,000 |
Future or forward foreign exchange contracts settlement period | 2015-09 | 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 |  |  |  |  |
Number of carbon credits | Unit | 1,727,000 | 1,112,000 | 1,727,000 | 1,112,000 |
Assets or liabilities measured at fair value on a recurring basis transferred between Level 1 and Level 2 classifications | $ 0 |  |  |  |
Senior Secured Notes [Member] |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |
Excess of estimated fair value over carrying value | $ 30,000,000 | $ 17,000,000 |  |  |
Senior Secured Notes [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |
Notes based on quoted price | $ / shares | $ 107.0 | $ 104.0 |  |  |
Foreign Exchange Contracts [Member] |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |
Contractual weighted-average exchange rate | $ / € | 1.14 |  | 1.14 |  |
Total estimated market weighted-average exchange rate | $ / € | 1.11 |  |  |  |

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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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