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Organization and Nature of Business (Detail) $ in Thousands, T in Millions |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Mar. 04, 2022 USD ($) T | Sep. 30, 2022 USD ($) | Sep. 30, 2023 USD ($) T | Sep. 30, 2022 USD ($) | Sep. 30, 2020 mine
Business Acquisition [Line Items] |  |  |  |  |
Processing capacity |  |  | 5.5 |  |
Acquisition of Blair facility | $ |  | $ 6,547 | $ 0 | $ 6,547 |
Number Of Mines And Related Facilities Acquired | mine |  |  |  |  | 2
Blair |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Acquisition of Blair facility | $ | $ 6,450 |  |  |  |
Asset Acquisition, Annual Processing Capacity Once Operational | 2.9 |  |  |  |
Utica | BNSF [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Processing capacity |  |  | 1.6 |  |

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