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Derivatives, Hedges and Financial Instruments - Additional Information (Detail) $ / shares in Units, MMBTU in Millions | 3 Months Ended | 12 Months Ended
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Sep. 30, 2021 USD ($) | Jun. 30, 2021 USD ($) | Mar. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) $ / shares $ / MMBTU | Sep. 30, 2020 USD ($) | Jun. 30, 2020 USD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2021 USD ($) MMBTU $ / MMBTU | Dec. 31, 2020 USD ($) MMBTU $ / shares $ / MMBTU shares | Dec. 31, 2019 USD ($)
Derivative Instruments And Hedging Activities Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Gain (loss) on sale of natural gas |  |  |  |  |  |  |  | $ 2,700,000 | $ (1,600,000) | $ 0
Realized gain on sale of natural gas |  |  |  |  |  |  |  | 6,800,000 |  |
Unrealized loss on sale of natural gas |  |  |  |  |  |  |  |  | (1,200,000) |
Fair value of embedded derivative, noncurrent liability |  |  |  | $ 1,000,000.0 |  |  |  |  | 1,000,000.0 |
Realized loss on fair value of embedded derivative |  |  |  |  |  |  |  | (3,300,000) |  |
Unrealized gain (loss) on fair value of embedded derivative | $ (1,106,000) | $ (716,000) | $ (436,000) | $ (561,000) | $ (141,000) | $ 120,000 | $ 637,000 |  |  |
Level 3 transfer |  |  |  |  |  |  |  | 0 | 0 | 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 |  |  |  |  |  |  |  | $ (2,300,000) | $ 100,000 | $ 500,000
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 |  |  |  |  | $ 3.39 |
Natural Gas Purchase Commitments [Member] |  |  |  |  |  |  |  |  |  |
Derivative Instruments And Hedging Activities Disclosures [Line Items] |  |  |  |  |  |  |  |  |  |
Natural gas purchase commitments volume | MMBTU |  |  |  |  |  |  |  | 5.4 |  |
Weighted average cost of natural gas per unit | $ / MMBTU |  |  |  |  |  |  |  | 4.53 |  |
Weighted average natural gas market value per unit | $ / MMBTU |  |  |  |  |  |  |  | 3.87 |  |
Realized gain on sale of natural gas |  |  |  |  |  |  |  | $ 1,500,000 |  |
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 |  |  |  |  | 2.65 |
Weighted average natural gas market value per unit | $ / MMBTU |  |  |  | 2.49 |  |  |  |  | 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 |  |  |  |  | $ 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 |  |  |  |  | $ 1,300,000 |

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