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Derivatives Hedges and Financial Instruments - Additional Information (Detail) $ / shares in Units, MMBTU in Millions, $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2020 USD ($) MMBTU $ / shares $ / MMBTU	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($) MMBTU $ / shares $ / MMBTU shares	Jun. 30, 2019 USD ($)	Dec. 31, 2019 $ / shares shares
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Loss on sale of natural gas | $	$ 0.7		$ (0.7)
Unrealized loss on sale of natural gas | $		$ 0.4		$ 0.4
Non-Operating Other Income [Member]
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Unrealized gain (loss) on fair value of embedded derivative | $	$ 0.1	$ (0.7)	$ 0.8	$ 0.5
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		303,646
Embedded Derivative [Member] | Common Stock Shares [Member]
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Common stock per share | $ / shares	$ 1.16		$ 1.16		$ 4.20
Natural Gas Purchase Commitments [Member]
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Natural gas purchase commitments volume | MMBTU	6.5		6.5
Weighted average cost of natural gas per unit	1.98		1.98
Weighted average natural gas market value per unit	1.72		1.72
Natural Gas Purchase Commitments [Member] | Level 2 [Member]
Derivative Instruments And Hedging Activities Disclosures [Line Items]
Natural gas purchase commitments volume | MMBTU	1.8		1.8
Weighted average cost of natural gas per unit	2.01		2.01
Weighted average natural gas market value per unit	1.94		1.94

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- Definition

The amount of gains and losses (realized and unrealized) recognized in earnings during the period on natural gas forward contracts measured at fair value.

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Natural gas purchase commitment volume.

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The preferred stock participation rights in dividends and liquidating distributions expressed in the aggregated number of shares of common stock.

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- Definition

The amount of unrealized gains and losses recognized in earnings during the period on natural gas forward contracts held as of period end measured at fair value.

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- Definition

Weighted average natural gas market value per unit.

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- Definition

Net Increase or Decrease in the fair value of the embedded derivative or group of embedded derivatives included in earnings in the period.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 15
-URI http://asc.fasb.org/subtopic&trid=2229187

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

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