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Significant Accounting Policies - Additional Information (Detail) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2025 USD ($) Facility State Segment	Dec. 31, 2023	Dec. 31, 2024 USD ($)
Significant Accounting Policies [Line Items]
Number of quarries and yards | Facility	390
Number of states in which entity operates | State	28
Reportable business segments | Segment	2
Restricted cash	$ 13		$ 0
Number of days restricted from utilizing cash	180 days
Percentage of minimum amount of income tax payments net of refunds received		5.00%
Letter of Credit
Significant Accounting Policies [Line Items]
Restricted cash	$ 4
Replacement Assets
Significant Accounting Policies [Line Items]
Restricted cash	$ 9

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- Definition

Number of days Restricted from utilizing cash.

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- Definition

Number of quarries and yards.

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- Definition

Percentage of minimum amount of income tax payments net of refunds received.

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- Definition

Significant accounting policies.

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- Definition

Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 47
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482785/280-10-55-47

Reference 2: http://www.xbrl.org/2003/role/exampleRef
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Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 280
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-Name Accounting Standards Codification
-Section 50
-Paragraph 18
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-18

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- Definition

The number of states the entity operates in as of the balance sheet date.

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- Definition

Amount of cash restricted as to withdrawal or usage. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 944
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
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-Publisher FASB
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