Maximum consolidated debt reduction for unrestricted cash and temporary investments for debt covenant calculation.

No definition available.

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Namespace Prefix:	mlm_
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- Definition

Ratio of consolidated net debt to earnings before interest taxes depreciation depletion and amortization.

+ References

No definition available.

+ Details

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- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

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- Definition

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

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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.

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+ Details

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- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

+ Details

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Balance Type:	credit
Period Type:	instant

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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+ Details

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Balance Type:	credit
Period Type:	instant

- Definition

Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

+ References

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

- Definition

Date the credit facility terminates, in YYYY-MM-DD format.

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- Definition

Period remaining on line of credit facility before it terminates, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Long-Term Debt - Additional Information (Detail) - USD ($)		9 Months Ended
	Sep. 18, 2024	Sep. 30, 2024	Jul. 02, 2024	Dec. 31, 2023
Debt Instrument [Line Items]
Maximum consolidated debt reduction for unrestricted cash and temporary investments for debt covenant calculation		$ 500,000,000
Outstanding letters of credit		33,000,000
Senior Notes
Debt Instrument [Line Items]
Line of credit, trade receivable securitization facility			$ 400,000,000
Interest rate on notes			4.25%
Revolving Facility
Debt Instrument [Line Items]
Credit facility commitment		$ 800,000,000
Debt instrument maturity period		Dec. 21, 2028
Outstanding borrowing under credit facility		$ 0		$ 0
Senior unsecured revolving facility, maturity period		5 years
Outstanding letters of credit		$ 3,000,000		$ 3,000,000
Maximum \| Including Acquisition Bridge Debt
Debt Instrument [Line Items]
Debt covenant		3.5
Maximum \| Excluding Acquisition Bridge Debt
Debt Instrument [Line Items]
Debt covenant		4
Trade Receivable Facility
Debt Instrument [Line Items]
Line of credit, trade receivable securitization facility		$ 400,000,000
Debt instrument maturity period	Sep. 17, 2025
Interest rate on notes		6.00%
Trade Receivable Facility \| Maximum
Debt Instrument [Line Items]
Credit facility commitment		$ 500,000,000
Trade Receivable Facility \| Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member]
Debt Instrument [Line Items]
Basis spread on variable rate		0.80%