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Derivatives Hedges and Financial Instruments - Additional Information (Detail) | 12 Months Ended
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Dec. 31, 2018 USD ($) $ / shares $ / Transaction shares | Dec. 31, 2017 USD ($) $ / shares $ / Transaction shares
Derivative Instruments And Hedging Activities Disclosures [Line Items] |  |
Series E redeemable preferred - embedded derivative | $ 1,642,000 | $ 2,660,000
Carbon credit fair value per unit | $ / Transaction | 2.35 | 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 | $ 5.52 | $ 8.76

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- Definition The preferred stock participation rights in dividends and liquidating distributions expressed in the aggregated number of shares of common stock. + References No definition available. + Details
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- Definition Fair value as of the balance sheet date of the embedded derivative or group of embedded derivatives classified as a liability. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624163-113959 + Details
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- Details
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