Performance obligation period.

No definition available.

Name:	mlm_PerformanceObligationPeriod
Namespace Prefix:	mlm_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Revenue recognition.

+ References

No definition available.

+ Details

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

- Definition

Date when acquisition agreement is executed in business combination, in YYYY-MM-DD format.

+ References

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

- Definition

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

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+ Details

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Balance Type:	credit
Period Type:	duration

- Definition

Description of timing for satisfying performance obligation in contract with customer. Includes, but is not limited to, as services are rendered, and upon shipment, delivery or completion of service.

+ References

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- Definition

Amount of transaction price allocated to performance obligation that has not been recognized as revenue.

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Balance Type:	credit
Period Type:	instant

- Details

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Namespace Prefix:
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Balance Type:
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- Details

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- Details

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- Details

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- Details

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REVENUES AND GROSS PROFIT - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Revenue Recognition [Line Items]
Performance obligations, description of timing			The Company’s product sales agreements are single-performance obligations that are satisfied at a point in time. Performance obligations within paving service agreements are satisfied over time, primarily ranging from one day to two years. Customer payments for the paving operations are generally based on contractual billing schedules and may, in certain circumstances, be contingent upon receipt of payment by the customer.
Future revenues from unsatisfied performance obligations	$ 240	$ 252	$ 240	$ 252
Service revenues	1,947	1,609	$ 3,309	2,771
British Columbia
Revenue Recognition [Line Items]
Business Combination, Date of Acquisition Agreement			Feb. 23, 2026
Service \| Colorado and British Columbia \| West Group
Revenue Recognition [Line Items]
Service revenues	$ 107		$ 126
Service \| Colorado and California \| West Group
Revenue Recognition [Line Items]
Service revenues		$ 102		$ 137
Minimum \| Service
Revenue Recognition [Line Items]
Performance obligations, period			1 day
Maximum \| Service
Revenue Recognition [Line Items]
Performance obligations, period			2 years