Divestitures, Discontinued Operations and Assets and Liabilities Held for Sale - Additional Information (Detail) $ in Millions		6 Months Ended
Apr. 01, 2022 USD ($)	Jun. 30, 2023 USD ($)	Jun. 30, 2022 USD ($) Plant
Business Acquisition [Line Items]
Cash used for operating and investing activities for discontinued operations		$ 42.5	$ 224.2
Revenues			235.0
Proceeds from Divestiture and sale of assets		57.5	235.0
Capital expenditures		$ 3.8	$ 13.2
Business combination number of California ready mix operations \| Plant			14
Colorado and Central Texas
Business Acquisition [Line Items]
Pretax gain	$ 151.7

Business combination number of California ready mix operations.

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Cash used for operating and investing activities for discontinued operations.

+ References

No definition available.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 805
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Amount of capital expenditure attributable to discontinued operations.

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Amount of consideration received or receivable for the disposal of assets and liabilities, including discontinued operation.

+ References

No definition available.

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- Definition

Amount of gain (loss) from sale and disposal of integrated set of activities and assets capable of being conducted and managed for purpose of providing return in form of dividend, lower cost, or other economic benefit to investor, owner, member and participant.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 230
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The cash inflow associated with the amount received from the sale of a portion of the company's business, for example a segment, division, branch or other business, during the period.

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