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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
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Jun. 30, 2021 USD ($) MMBTU $ / shares $ / MMBTU | Jun. 30, 2020 USD ($) | Jun. 30, 2021 USD ($) MMBTU $ / shares $ / MMBTU shares | Jun. 30, 2020 USD ($) | Dec. 31, 2020 MMBTU $ / shares $ / MMBTU shares
Derivative Instruments And Hedging Activities Disclosures [Line Items] |  |  |  |  |
Gain (loss) on sale of natural gas | $ |  | $ 0.7 | $ 2.7 | $ (0.7) |
Realized gain on sale of natural gas | $ |  |  | 1.5 |  |
Non-Operating Other Income and Expense [Member] |  |  |  |  |
Derivative Instruments And Hedging Activities Disclosures [Line Items] |  |  |  |  |
Unrealized gain (loss) on fair value of embedded derivative | $ | $ (0.7) | $ 0.1 | $ (1.2) | $ 0.8 |
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 | $ 6.05 |  | $ 6.05 |  | $ 3.39
Natural Gas Purchase Commitments |  |  |  |  |
Derivative Instruments And Hedging Activities Disclosures [Line Items] |  |  |  |  |
Natural gas purchase commitments volume | MMBTU | 4.7 |  | 4.7 |  |
Weighted average cost of natural gas per unit | 2.75 |  | 2.75 |  |
Weighted average natural gas market value per unit | 3.40 |  | 3.40 |  |
Natural Gas Purchase Commitments | 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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