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Derivatives, Hedges, Financial Instruments and Carbon Credits - Additional Information (Detail)	9 Months Ended	12 Months Ended
	Sep. 30, 2018 USD ($) Unit $ / shares $ / Transaction shares	Dec. 31, 2017 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	488,000	0
Series E redeemable preferred - embedded derivative | $	$ 2,970,000	$ 2,660,000
Redemption of preferred stock | shares	0
Carbon credit fair value per unit | $ / Transaction	2.35
Embedded Derivative [Member]
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Series E redeemable preferred - embedded derivative | $	$ 0	$ 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	$ 9.78	$ 8.76

X

- Definition

The number of carbon credit units held by the entity subject to contractual obligations.

+ References

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- Definition

The fair value per carbon credit unit as of the balance sheet date.

+ References

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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

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- Definition

Redeemable preferred stock.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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

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- Definition

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