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Derivatives, Hedges, Financial Instruments and Carbon Credits - Additional Information (Detail) | 9 Months Ended | 12 Months Ended |  |  |  |
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Sep. 30, 2016 USD ($) Unit $ / shares $ / MMBTU $ / Transaction $ / € shares | Dec. 31, 2015 $ / shares $ / MMBTU shares | Sep. 30, 2016 EUR (€) Unit $ / Transaction $ / € | Sep. 07, 2016 | Dec. 31, 2015 EUR (€) MMBTU Unit $ / Transaction $ / € | Feb. 28, 2011 USD ($)
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |  |
Contractual weighted-average cost | $ / MMBTU | 3.01 | 2.35 |  |  |  |
Estimated weighted-average market value | $ / MMBTU | 3.02 |  |  |  |  |
Contractual weighted-average exchange rate | $ / € | 1.12 |  | 1.12 |  | 1.12 |
Carbon credit fair value per unit | $ / Transaction | 0 |  | 0 |  | 2.35 |
Derivative future or forward contracts in volume | MMBTU |  |  |  |  | 1,820,000 |
The month future or forward natural gas contract period ends |  | 2016-12 |  |  |  |
Amount of foreign currency contract | € |  |  | € 66,000 |  | € 280,000 |
Future or forward foreign exchange contracts settlement period | 2017-02 | 2017-02 |  |  |  |
LIBOR rate |  |  |  |  |  | 3.23%
Interest rate contracts fixed rate description | fixed three-month LIBOR rate of 3.23% on a declining balance |  |  |  |  |
Interest rate swap declining balance beginning balance |  |  |  |  |  | $ 23,800,000
Interest rate swap declining balance ending balance |  |  |  |  |  | $ 18,800,000
Maturity period interest rate contracts held | Mar. 31, 2016 |  |  |  |  |
Number of carbon credits | Unit | 0 |  | 0 |  | 495,000 |
Assets measured at fair value on a recurring basis transferred between Level 1 and Level 2 classifications | $ 0 |  |  |  |  |
Assets measured at fair value on a recurring basis transferred between Level 2 and Level 1 classifications | 0 |  |  |  |  |
Liabilities measured at fair value on a recurring basis transferred between Level 1 and Level 2 classifications | 0 |  |  |  |  |
Liabilities measured at fair value on a recurring basis transferred between Level 2 and Level 1 classifications | $ 0 |  |  |  |  |
12% Senior Secured Notes [Member] |  |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |  |
Debt instrument, interest rate | 12.00% |  | 12.00% | 12.00% |  |
Foreign Exchange Contracts [Member] |  |  |  |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |  |  |  |
Contractual weighted-average exchange rate | $ / € | 1.12 |  | 1.12 |  |  |
Total estimated market weighted-average exchange rate | $ / € | 1.13 |  |  |  |  |
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 | 303,646 | 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 | $ 8.58 | $ 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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