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Derivatives Hedges and Financial Instruments - Additional Information (Detail) $ / shares in Units, MMBTU in Millions, $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
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Sep. 30, 2020 USD ($) MMBTU $ / shares $ / MMBTU | Sep. 30, 2019 USD ($) | Sep. 30, 2020 USD ($) MMBTU $ / shares $ / MMBTU shares | Sep. 30, 2019 USD ($) | Dec. 31, 2019 $ / shares shares
Derivative Instruments And Hedging Activities Disclosures [Line Items] |  |  |  |  |
Gain (loss) on sale of natural gas | $ | $ 0.5 |  | $ (0.2) |  |
Unrealized gain on sale of natural gas | $ |  | $ 0.8 |  | $ 0.6 |
Non-Operating Other Income [Member] |  |  |  |  |
Derivative Instruments And Hedging Activities Disclosures [Line Items] |  |  |  |  |
Unrealized gain (loss) on fair value of embedded derivative | $ | $ 0.1 | $ 0.4 | $ 0.6 | $ 0.1 |
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 | $ 1.61 |  | $ 1.61 |  | $ 4.20
Natural Gas Purchase Commitments [Member] |  |  |  |  |
Derivative Instruments And Hedging Activities Disclosures [Line Items] |  |  |  |  |
Natural gas purchase commitments volume | MMBTU | 4.3 |  | 4.3 |  |
Weighted average cost of natural gas per unit | 2.46 |  | 2.46 |  |
Weighted average natural gas market value per unit | 2.48 |  | 2.48 |  |
Natural Gas Purchase Commitments [Member] | Level 2 [Member] |  |  |  |  |
Derivative Instruments And Hedging Activities Disclosures [Line Items] |  |  |  |  |
Natural gas purchase commitments volume | MMBTU | 1.0 |  | 1.0 |  |
Weighted average cost of natural gas per unit | 2.01 |  | 2.01 |  |
Weighted average natural gas market value per unit | 2.53 |  | 2.53 |  |

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