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Divestitures, Discontinued Operations and Assets and Liabilities Held for Sale - Additional Information (Detail) $ in Millions |  | 3 Months Ended | 6 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
Apr. 01, 2022 USD ($) | Sep. 30, 2023 USD ($) | Sep. 30, 2022 USD ($) | Jun. 30, 2022 USD ($) Plant | Sep. 30, 2023 USD ($) | Sep. 30, 2022 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |
Total cash used for operating activities related to discontinued operations |  |  |  |  | $ 9.1 | $ 35.8
Total cash provided by investing activities related to discontinued operations |  |  |  |  | 53.0 | 236.7
Revenues |  |  |  | $ 235.0 |  |
Pretax (loss) gain on divestitures and sales of assets |  | $ (21.9) | $ 0.7 |  | (19.6) | (0.3)
Proceeds from divestitures and sale of assets |  |  |  |  | 57.5 | 249.9
Capital expenditures |  |  |  |  | $ 4.5 | $ 13.2
Business combination number of California ready-mixed concrete operations | Plant |  |  |  | 14 |  |
Colorado and Central Texas |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Pretax gain | $ 151.9 |  |  |  |  |

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