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Derivatives, Hedges, Financial Instruments and Carbon Credits - Additional Information (Detail) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2017 USD ($) Unit $ / shares shares | Dec. 31, 2016 USD ($) Unit $ / shares shares
Derivative Instruments And Hedging Activities Disclosures [Line Items] |  |
Number of carbon credits or related contractual obligations associated with carbon credits | Unit | 0 | 0
Series E redeemable preferred - embedded derivative | $ 3,137,000 | $ 2,557,000
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 |
Embedded Derivative [Member] |  |
Derivative Instruments And Hedging Activities Disclosures [Line Items] |  |
Series E redeemable preferred - embedded derivative | $ 0 |
Participating right in dividends and liquidating distributions expressed in number of common shares | shares | 303,646 | 303,646
Embedded Derivative [Member] | Common Stock Shares [Member] |  |
Derivative Instruments And Hedging Activities Disclosures [Line Items] |  |
Common stock per share | $ / shares | $ 10.33 | $ 8.42

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