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Derivatives Hedges and Financial Instruments - Additional Information (Detail) $ / shares in Units, MMBTU in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2020 USD ($) MMBTU $ / shares $ / MMBTU shares | Dec. 31, 2019 USD ($) $ / shares shares | Dec. 31, 2018 USD ($)
Derivative Instruments And Hedging Activities Disclosures [Line Items] |  |  |
Gain (loss) on sale of natural gas | $ | $ (1.6) | $ 0.0 | $ 0.0
Unrealized loss on sale of natural gas | $ | 1.2 |  |
Non-Operating Other Income and Expense [Member] |  |  |
Derivative Instruments And Hedging Activities Disclosures [Line Items] |  |  |
Unrealized gain (loss) on fair value of embedded derivative | $ | $ 0.1 | $ 0.5 | $ 1.2
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 [Member] |  |  |
Derivative Instruments And Hedging Activities Disclosures [Line Items] |  |  |
Common stock per share | $ / shares | $ 3.39 | $ 4.20 |
Natural Gas Purchase Commitments [Member] |  |  |
Derivative Instruments And Hedging Activities Disclosures [Line Items] |  |  |
Natural gas purchase commitments volume | MMBTU | 3.8 |  |
Weighted average cost of natural gas per unit | 2.80 |  |
Weighted average natural gas market value per unit | 2.36 |  |
Natural Gas Purchase Commitments [Member] | Level 2 [Member] |  |  |
Derivative Instruments And Hedging Activities Disclosures [Line Items] |  |  |
Natural gas purchase commitments volume | MMBTU | 7.3 |  |
Weighted average cost of natural gas per unit | 2.65 |  |
Weighted average natural gas market value per unit | 2.49 |  |

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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 + Details
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