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Inventories, net Inventory, Net Inventories, net Cash Flows from Operating Activities: Net Cash Provided by (Used in) Operating Activities [Abstract] Consolidation Items Consolidation Items [Axis] Business Acquisition [Line Items] Business Acquisition [Line Items] Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment, Ending Balance Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment, Beginning Balance Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment, Total Allowances for depreciation, depletion and amortization Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Weighted Average Number of Shares Outstanding, Basic, Total Basic weighted-average common shares outstanding Basic Weighted Average Number of Shares Outstanding, Basic Guarantee of affiliate's obligations Guarantor Obligations, Maximum Exposure, Undiscounted Products in process Inventory, Work in Process, Gross Significant Accounting Policies [Table] Significant Accounting Policies [Table] Significant accounting policies. Cash Flows from Financing Activities: Net Cash Provided by (Used in) Financing Activities [Abstract] Statement [Table] Statement [Table] Accounts Receivable Accounts Receivable [Member] Document Fiscal Period Focus Document Fiscal Period Focus Restricted Investments Investment, Policy [Policy Text Block] Financial Instruments Financial Instruments Disclosure [Text Block] Statement [Line Items] Statement [Line Items] Business combination number of south texas ready mix operations Business Combination Number Of South Texas Ready Mix Operations Business Combination Number Of South Texas Ready Mix Operations Restricted Cash and Cash Equivalents [Abstract] Net cash used for investing activities (capital expenditures) Cash Provided by (Used in) Investing Activities, Discontinued Operations Long-Term Debt Schedule of Long-Term Debt Instruments [Table Text Block] Interest-only loan receivable Interest Only Loan Receivable [Member] Interest only loan receivable. Settlement charge Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement Contract with Customer, Asset, after Allowance for Credit Loss, Total Costs in excess of billings Contract with Customer, Asset, after Allowance for Credit Loss Outstanding letters of credit Letters of Credit Outstanding, Amount Construction Contractor, Receivable, Retainage, Total Retainage on contracts Construction Contractor, Receivable, Retainage Ready Mixed Concrete Ready Mixed Concrete [Member] Ready mixed concrete. Accounts Receivable, after Allowance for Credit Loss, Current, Total Accounts receivable, net Accounts Receivable, after Allowance for Credit Loss, Current Aggregates Aggregates [Member] Aggregates. Common Stock Common Stock [Member] Debt Instrument [Line Items] Debt Instrument [Line Items] Number of customer accounted for 10% or more of consolidated accounts receivable Number Of Customers Accounted For Ten Percent Or More Of Revenues Number of customers accounted for ten percent or more of revenues. Cash and Cash Equivalents, at Carrying Value, Ending Balance Cash and Cash Equivalents, at Carrying Value, Beginning Balance Cash and Cash Equivalents, at Carrying Value, Total Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Stock Repurchased During Period, Value Repurchase amount Repurchases of common stock Other current assets Other Assets, Current Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Income/ loss from discontinued operations Loss from discontinued operations, net of income tax benefit Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent Inventory, Finished Goods, Gross, Total Finished products Inventory, Finished Goods, Gross Number of quarries and yards Number Of Quarries And Yards Number of quarries and yards. Other operating (income) expense, net Other operating (income) expense, net Other Operating Income (Expense), Net Discontinued Operations and Disposal Groups [Abstract] Cover [Abstract] Selling, General and Administrative Expense, Total Selling, General and Administrative Expense Selling, general and administrative expenses Document Fiscal Year Focus Document Fiscal Year Focus Income Taxes Paid, Net, Total Cash paid for income taxes, net of refunds Income Taxes Paid, Net Customer payments terms based on contractual billing Customer Payment Terms Based On Contractual Billing Customer payment terms based on contractual billing. Accrued interest Interest Payable, Current Lease obligations Lease obligations Lease Obligation, Held-for-Sale Lease obligation, held-for-sale. Number of days restricted from utilizing cash Number Of Days Restricted From Utilizing Cash Number of days Restricted from utilizing cash. Reclassification out of Accumulated Other Comprehensive Income Reclassification out of Accumulated Other Comprehensive Income [Member] Segment Reporting [Abstract] Security Exchange Name Security Exchange Name Other comprehensive earnings, net of tax Other comprehensive earnings (loss), net of tax Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Reconciliation of Cash, Cash Equivalents and Restricted Cash Schedule of Cash and Cash Equivalents [Table Text Block] New Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Property, Plant and Equipment, Gross, Ending Balance Property, Plant and Equipment, Gross, Beginning Balance Property, Plant and Equipment, Gross, Total Property, plant and equipment Property, Plant and Equipment, Gross Payments of Ordinary Dividends, Noncontrolling Interest Distributions to owners of noncontrolling interest Distributions to owners of noncontrolling interest Basis of Presentation and Use of Estimates Basis Of Presentation And Use Of Estimates Policy [Text Block] Basis of presentation and use of estimates. Right-of-use assets obtained in exchange for new operating lease liabilities Right-of-Use Asset Obtained in Exchange for Operating Lease Liability Business Acquisition, Acquiree Business Acquisition, Acquiree [Domain] Weighted-Average Common Shares Outstanding: Weighted Average Number of Shares Outstanding, Diluted [Abstract] Entity Emerging Growth Company Entity Emerging Growth Company Amendment Flag Amendment Flag Total noncurrent assets held for sale Noncurrent assets held for sale Disposal Group, Including Discontinued Operation, Assets, Noncurrent Tax effect of other comprehensive earnings Accumulated Other Comprehensive Loss Noncurrent Deferred Tax Assets Other Comprehensive Earnings Tax Effect Pension And Postretirement Benefit Plans Accumulated other comprehensive loss, noncurrent deferred tax assets, other comprehensive earnings, tax effect, pension and postretirement benefit plans. Basis of Presentation Basis of Accounting, Policy [Policy Text Block] LIBOR Member LIBOR [Member] London Interbank Offered Rate . Proceeds from Sales of Business, Affiliate and Productive Assets Proceeds from divestitures and sales of assets Other Operating Income (Expense), Net Other Operating Income and Expense [Text Block] Variable Rate Variable Rate [Domain] Entity File Number Securities Act File Number West Group Building Materials Business West Group Building Materials Business West Group [Member] Building materials business west group. Building Materials Business East Group Building Materials Business East Group [Member] Building materials business east group. Debt instrument maturity period Line of Credit Facility, Expiration Date Goodwill and Intangible Assets Disclosure [Abstract] 2.400% Senior Notes, Due 2031 Two Point Four Zero Zero Percent Senior Notes Due Twenty Thirty One [Member] Two point four zero zero percent senior notes, due twenty thirty one. Long-term Debt, Excluding Current Maturities, Total Long-term debt Long-Term Debt, Excluding Current Maturities Total cash, cash equivalents and restricted cash presented in the consolidated statements of cash flows Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents Cash, Cash Equivalents and Restricted Cash, beginning of period Cash, Cash Equivalents and Restricted Cash, end of period Remeasurement of operating lease right-of-use assets Remeasurement Of Operating Leases Right Of Use Assets Remeasurement of operating leases right of use assets. Loss from discontinued operations, net of income tax benefit Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest, Total Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest Disposal Group Classification Disposal Group Classification [Domain] Dividends declared Dividends, Common Stock, Cash Accounts Payable, Current, Total Accounts payable Accounts Payable, Current Debt Instrument Debt Instrument [Axis] Other Receivables Asphalt and paving services Asphalt and Paving Services [Member] Asphalt and paving services. Other intangibles, net Other Intangible Assets, Net Performance obligations, period Performance Obligation Period Performance obligation period. Schedule Of Defined Benefit Plans Disclosures [Table] Schedule of Defined Benefit Plans Disclosures [Table] Preferred Stock, Value, Issued, Ending Balance Preferred Stock, Value, Issued, Beginning Balance Preferred Stock, Value, Issued, Total Preferred stock, par value $0.01 per share Preferred Stock, Value, Issued Entity Small Business Entity Small Business Entity Shell Company Entity Shell Company Asset Retirement Obligations, Noncurrent, Total Asset Retirement Obligations, Noncurrent Noncurrent asset retirement obligations Interproduct Revenues Intersubsegment Eliminations [Member] Affiliate line of credit facility maturity period Affiliate Line of Credit Facility Maturity Period Line of credit maturity period Entity Address, Address Line One Entity Address, Address Line One Goodwill Goodwill Disclosure [Text Block] Other Liabilities, Current, Total Other current liabilities Other Liabilities, Current Restricted Cash, Total Restricted cash Restricted Cash Revenues And Gross Profit [Abstract] Revenues and gross profit. Income Statement Location Income Statement Location [Axis] Long-term Debt, Type Long-Term Debt, Type [Axis] Consolidated net earnings Consolidated net earnings Consolidated net earnings Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Corporate Corporate, Non-Segment [Member] Basic loss per share from discontinued operations attributable to common shareholders Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic Share, Total Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic Share Right-of-use assets obtained in exchange for new finance lease liabilities Right-of-Use Asset Obtained in Exchange for Finance Lease Liability Depreciation, Depletion and Amortization, Total Depreciation, depletion and amortization Depreciation, Depletion and Amortization Product and Service Product and Service [Axis] Title of 12(b) Security Title of 12(b) Security Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture, Total Issuances of common stock for stock award plans Shares Issued, Value, Share-Based Payment Arrangement, after Forfeiture 6.25% Senior Notes, Due 2037 Six Point Two Five Percentage Of Senior Notes Due Two Thousand Thirty Seven [Member] Six point two five percentage of senior notes due two thousand thirty seven. 0.650% Senior Notes, Due 2023 (discharged) Zero Point Six Five Zero Percent Senior Notes Due Twenty Twenty Three [Member] Zero point six five zero percent senior notes, due twenty twenty three. Accrued other taxes Accrued Other Taxes Current Accrued other taxes current. Diluted loss per share from discontinued operations attributable to common shareholders Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share, Total Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share Alabama Definitive Agreement Alabama Definitive Agreement [Member] Alabama definitive agreement. Acquisition, divestiture and integration expenses Business Combination Acquisition Divestiture And Integration Related Costs Business combination acquisition divestiture and integration related costs. Cash Flows from Investing Activities: Net Cash Provided by (Used in) Investing Activities [Abstract] Long-term Line of Credit, Total Outstanding borrowing under credit facility Long-Term Line of Credit Business combination periods for production level Business Combination, periods for production level Business Combination, periods for production level Restricted Cash Cash and Cash Equivalents, Restricted Cash and Cash Equivalents, Policy [Policy Text Block] Dividends declared Common Stock, Dividends, Per Share, Declared Increase (Decrease) in Inventories, Total Inventories, net Increase (Decrease) in Inventories Contract with Customer, Liability, Total Billings in excess of costs Contract with Customer, Liability Remeasurement of finance lease right-of-use assets Remeasurement Of Finance Lease Right Of Use Assets Remeasurement of finance lease right-of-use assets. Common stock, shares outstanding Beginning Balance (in shares) Ending Balance (in shares) Common Stock, Shares, Outstanding Schedule Of Product Information [Table] Schedule of Product Information [Table] Supplemental Cash Flow Elements [Abstract] Retirement Plan Type Retirement Plan Type [Axis] Concentration Risk Type Concentration Risk Type [Domain] Income Statement Location Income Statement Location [Domain] Document Type Document Type Amortization of prior service cost Defined Benefit Plan, Amortization of Prior Service Cost (Credit) Amortization of prior service cost Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, before Tax Line of Credit Facility, Current Borrowing Capacity Line of credit, trade receivable securitization facility Net Cash Provided by (Used in) Investing Activities Net Cash Provided by (Used for) Investing Activities Document Quarterly Report Document Quarterly Report Schedule of Components of Net Periodic Benefit Cost Schedule of Net Benefit Costs [Table Text Block] Noncurrent Deferred Tax Assets Recorded In Accumulated Other Comprehensive Loss Noncurrent Deferred Tax Assets Recorded In Accumulated Other Comprehensive Loss Table [Text Block] Noncurrent deferred tax assets recorded in accumulated other comprehensive loss. Disposal Group Classification Disposal Group Classification [Axis] Inventory, Gross Total inventories Net Cash Provided by (Used in) Financing Activities Net Cash Used for Financing Activities Entity Filer Category Entity Filer Category Variable Rate Variable Rate [Axis] Number of cement plants Number Of Cement Plants Number of cement plants. Accrued liabilities for purchases of property, plant and equipment Capital Expenditures Incurred but Not yet Paid Total Liabilities Liabilities Accumulated Other Comprehensive Income Loss [Table] Accumulated Other Comprehensive Income (Loss) [Table] Commitments And Contingencies [Table] Commitments And Contingencies [Table] Commitments and contingencies. Total Shareholders' Equity Equity, Attributable to Parent Beginning Balance Ending Balance Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Net Earnings Attributable to Martin Marietta Interest Expense, Total Interest expense Interest Expense Restricted investments Restricted Investments Other Receivable, after Allowance for Credit Loss, Related Party, Type [Extensible Enumeration] Reportable Subsegments Reportable Subsegments [Member] Statement of Financial Position [Abstract] Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture, Total Issuances of common stock for stock award plans (in shares) Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture Diluted weighted-average common shares outstanding Diluted Weighted Average Number of Shares Outstanding, Diluted Credit Facility Credit Facility [Axis] Effective Income Tax Rate Reconciliation, Percent, Total Effective income tax rates for continuing operations Effective Income Tax Rate Reconciliation, Percent Other Income and Expenses [Abstract] Basic earnings per share from continuing operations attributable to common shareholders Income (Loss) from Continuing Operations, Per Outstanding Share, Total Income (Loss) from Continuing Operations, Per Basic Share Restricted investments discharge amount Restricted Investments To Discharge Long Term Debt Restricted investments to discharge long term debt. Net periodic benefit cost Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Colorado and Central Texas Colorado and Central Texas [Member] Colorado and Central Texas Income Taxes Income Tax Disclosure [Text Block] Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Line Items] Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] Lehigh West Region Lehigh Hanson Incorporation West Region [Member] Lehigh Hanson, Incorporation West Region [Member] Basic and Diluted Earnings from Continuing Operations Per Common Share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Fair Value Disclosures [Abstract] Summary of Estimated Fair Values of Assets Acquired and Liabilities Assumed Schedule of Business Acquisitions, by Acquisition [Table Text Block] Consolidated comprehensive earnings Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest, Total Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Payments to Acquire Property, Plant, and Equipment, Total Additions to property, plant and equipment Payments to Acquire Property, Plant, and Equipment Reclassification, Comparability Adjustment [Policy Text Block] Reclassifications Employee-related Liabilities, Current, Total Employee-related Liabilities, Current Accrued salaries, benefits and payroll taxes Business Acquisition Business Acquisition [Axis] Income Tax Disclosure [Abstract]