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Organization and Nature of Business (Detail) $ in Thousands, T in Millions |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Sep. 18, 2020 USD ($) | Sep. 30, 2021 USD ($) T | Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) T | Sep. 30, 2020 USD ($)
Business Acquisition [Line Items] |  |  |  |  |
Processing capacity | T |  | 7.1 |  | 7.1 |
Other income | $ |  | $ 1,792 | $ 80 | $ 5,457 | $ 162
Business Combination, Bargain Purchase, Gain Recognized, Amount | $ | $ 39,600 |  |  |  |
Eagle Materials Holdings [Member] | BNSF [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Processing capacity | T |  | 1.6 |  | 1.6 |

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