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Derivatives Hedges and Financial Instruments - Additional Information (Detail) $ / shares in Units, MMBTU in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2021 USD ($) $ / MMBTU | Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) MMBTU $ / MMBTU | Sep. 30, 2020 USD ($) | Dec. 31, 2020 USD ($) MMBTU $ / shares $ / MMBTU shares
Derivative Instruments And Hedging Activities Disclosures [Line Items] |  |  |  |  |
Gain (loss) on sale of natural gas |  | $ 500,000 | $ 2,700,000 | $ (200,000) |
Realized gain on sale of natural gas |  |  | 1,500,000 |  |
Fair value of embedded derivative, noncurrent liability |  |  |  |  | $ 1,029,000
Realized loss on fair value of embedded derivative |  |  | (3,300,000) |  |
Level 3 transfer |  |  | 0 |  |
Non-Operating Other Income and Expense [Member] |  |  |  |  |
Derivative Instruments And Hedging Activities Disclosures [Line Items] |  |  |  |  |
Unrealized gain (loss) on fair value of embedded derivative | $ (1,100,000) | $ (100,000) | $ (2,300,000) | $ 600,000 |
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
Embedded Derivative [Member] | Common Stock [Member] |  |  |  |  |
Derivative Instruments And Hedging Activities Disclosures [Line Items] |  |  |  |  |
Common stock per share | $ / shares |  |  |  |  | $ 3.39
Natural Gas Purchase Commitments [Member] |  |  |  |  |
Derivative Instruments And Hedging Activities Disclosures [Line Items] |  |  |  |  |
Natural gas purchase commitments volume | MMBTU |  |  | 4.8 |  |
Weighted average cost of natural gas per unit | $ / MMBTU | 3.84 |  | 3.84 |  |
Weighted average natural gas market value per unit | $ / MMBTU | 5.55 |  | 5.55 |  |
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 | $ / MMBTU |  |  |  |  | 2.65
Weighted average natural gas market value per unit | $ / MMBTU |  |  |  |  | 2.49
Natural Gas Purchase Commitments [Member] | Natural Gas Current Asset [Member] | Level 2 [Member] |  |  |  |  |
Derivative Instruments And Hedging Activities Disclosures [Line Items] |  |  |  |  |
Natural gas contracts, fair value disclosure |  |  |  |  | $ 100,000
Natural Gas Purchase Commitments [Member] | Natural Gas Current Liability [Member] | Level 2 [Member] |  |  |  |  |
Derivative Instruments And Hedging Activities Disclosures [Line Items] |  |  |  |  |
Natural gas contracts, fair value disclosure |  |  |  |  | $ 1,300,000

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