Derivatives, Hedges, Financial Instruments and Carbon Credits - Additional Information (Detail)	12 Months Ended
Dec. 31, 2017 USD ($) Unit $ / shares $ / Transaction 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	$ 2,660,000	$ 2,557,000
Carbon credit fair value per unit \| $ / Transaction	0
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
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	$ 8.76	$ 8.42

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

No definition available.

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- Definition

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

+ References

No definition available.

+ Details

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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

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.

+ References

No definition available.

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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://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4B
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=84234895&loc=SL5624163-113959

+ Details

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- Definition

Amount of transfers of assets measured on a recurring basis out of Level 1 of the fair value hierarchy into Level 2.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bb)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

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- Definition

Amount of transfers of assets measured on a recurring basis out of Level 2 of the fair value hierarchy into Level 1.

+ References

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- Definition

Amount of transfers of liabilities measured on a recurring basis out of Level 1 of the fair value hierarchy into Level 2.

+ References

+ Details

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- Definition

Amount of transfers of liabilities measured on a recurring basis out of Level 2 of the fair value hierarchy into Level 1.

+ References

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- Definition

Price of a single share of a number of saleable stocks of a company.

+ References

No definition available.

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- Details

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