Debt instrument maturity date year.

No definition available.

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Balance Type:	na
Period Type:	duration

- Definition

Number of cement plants.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

- Definition

Number of days Restricted from utilizing cash.

+ References

No definition available.

+ Details

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Data Type:	xbrli:durationItemType
Balance Type:	na
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- Definition

Number of quarries and yards.

+ References

No definition available.

+ Details

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Namespace Prefix:	mlm_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Significant accounting policies.

+ References

No definition available.

+ Details

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Face (par) amount of debt instrument at time of issuance.

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

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Balance Type:	na
Period Type:	instant

- 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

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Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

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

+ References

No definition available.

+ Details

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Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount after tax, before reclassification adjustments of other comprehensive income (loss).

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Balance Type:	credit
Period Type:	duration

- 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.

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- Definition

Investments which are not defined as or included in marketable (debt, equity, or other) securities whose use is restricted in whole or in part, generally by contractual agreements or regulatory requirements. For use in an unclassified balance sheet.

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Significant Accounting Policies - Additional Information (Detail) $ in Millions	3 Months Ended	6 Months Ended		12 Months Ended
	Jun. 30, 2022 USD ($)	Jun. 30, 2023 USD ($) Facility State Segment Plant	Jun. 30, 2022 USD ($)	Dec. 31, 2022 USD ($)
Significant Accounting Policies [Line Items]
Number of quarries and yards \| Facility		350
Number of states in which entity operates \| State		28
Reportable business segments \| Segment		2
Restricted cash		$ 0.0		$ 0.8
Number of days restricted from utilizing cash				180 days
Restricted investments		702.3		$ 704.6
0.650% Senior Notes, Due 2023 (discharged)
Significant Accounting Policies [Line Items]
Debt instrument, face amount		$ 700.0		$ 700.0
Interest rate on notes		0.65%		0.65%
Maturity year		2023		2023
Pension and Postretirement Benefit Plans
Significant Accounting Policies [Line Items]
Other comprehensive loss, before reclassifications, net of tax	$ (0.4)	$ (0.1)	$ 33.0
California
Significant Accounting Policies [Line Items]
Number of cement plants \| Plant		1