Entity Address, City or Town Entity Address, City or Town Stock Repurchased During Period, Value Repurchase amount Repurchases of common stock Fair Value Disclosures [Abstract] Net Earnings Attributable to Martin Marietta Per Common Share Earnings Per Share [Abstract] Continuing Operations Disposal Group, Held-for-sale, Not Discontinued Operations [Member] Cash Flows from Financing Activities: Net Cash Provided by (Used in) Financing Activities [Abstract] Restricted investments Purchase of restricted investments to discharge long-term debt Purchase Of Restricted Investments To Discharge Long-Term Debt Purchase of restricted investments to discharge long-term debt Increase (Decrease) in Other Operating Assets and Liabilities, Net, Total Other assets and liabilities, net Increase (Decrease) in Other Operating Assets and Liabilities, Net Long-term Line of Credit, Total Outstanding borrowing under credit facility Long-Term Line of Credit Amendment Flag Amendment Flag Products. Products Products [Member] Accrued liabilities for purchases of property, plant and equipment Capital Expenditures Incurred but Not yet Paid Less: Distributed and undistributed earnings attributable to unvested awards Participating Securities, Distributed and Undistributed Earnings (Loss), Diluted Including Acquisition Bridge Debt Including Acquisition Bridge Debt [Member] Including acquisition bridge debt. Asset retirement obligations Disposal Group Including Discontinued Operation Asset Retirement Obligations Noncurrent Disposal group including discontinued operation asset retirement obligations noncurrent. Balance at September 30, 2022 Goodwill, Total Goodwill Balance at January 1, 2022 Goodwill Operating lease right-of-use assets, net Operating Lease, Right-of-Use Asset Costs Incurred, Asset Retirement Obligation Incurred Assumed asset retirement obligations liability Document Quarterly Report Document Quarterly Report Debt Instrument [Table] Schedule of Long-Term Debt Instruments [Table] Intangible assets fair value adjustment Finite-Lived Intangible Assets, Purchase Accounting Adjustments Repurchases of common stock Payments for Repurchase of Common Stock Foreign Currency Accumulated Foreign Currency Adjustment Attributable to Parent [Member] Revenue Recognition [Table] Revenue Recognition [Table] Revenue recognition. Earnings per Common Share Earnings Per Share, Policy [Policy Text Block] Statement [Table] Statement [Table] Noncurrent operating lease liabilities Operating Lease, Liability, Noncurrent Subsegments Subsegments [Domain] Postretirement Benefits Other Postretirement Benefits Plan [Member] London Interbank Offered Rate(LIBOR) London Interbank Offered Rate (LIBOR) [Member] Service Service [Member] Business Acquisition Business Acquisition [Axis] Accumulated Other Comprehensive Income Loss [Table] Accumulated Other Comprehensive Income (Loss) [Table] Dividends paid Payments of Ordinary Dividends, Common Stock Construction Contractor, Receivable, Retainage, Total Retainage on contracts Construction Contractor, Receivable, Retainage 3.500% Senior Notes, Due 2027 Three Point Five Zero Zero Percent Senior Notes Due Twenty Twenty Seven [Member] Three point five zero zero percent senior notes due twenty twenty seven. Inventories Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Inventory Gain (Loss) on Disposition of Business Pretax gain Gain on sale of investment Product and Service Product and Service [Axis] Tiller Corporation Tiller Corporation [Member] Tiller Corporation. Employee-related Liabilities, Current, Total Employee-related Liabilities, Current Accrued salaries, benefits and payroll taxes Disposal Group Classification Disposal Group Classification [Domain] Debt Instrument, Repurchased Face Amount Principal amount of stock repurchased during the period Concentration Risk Type Concentration Risk Type [Axis] 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 Amounts reclassified from accumulated other comprehensive loss, net of tax Earnings from Continuing Operations Amounts reclassified from accumulated other comprehensive loss, net of tax Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax Total Liabilities and Equity Liabilities and Equity Interproduct Revenues Intersubsegment Eliminations [Member] Other Liabilities, Current, Total Other current liabilities Other Liabilities, Current Weighted-Average Common Shares Outstanding: Weighted Average Number of Shares Outstanding, Diluted [Abstract] Other liabilities Disposal Group, Including Discontinued Operation, Other Liabilities, Noncurrent Inventory, Raw Materials, Gross, Total Raw materials Inventory, Raw Materials, Gross Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Income Statement [Abstract] 3.450% Senior Notes, Due 2027 Three Point Four Five Zero Percent Senior Notes Due Twenty Twenty Seven [Member] Three point four five zero percent senior notes due twenty twenty seven. Payments for (Proceeds from) Life Insurance Policies, Total Investments in life insurance contracts, net Payments for (Proceeds from) Life Insurance Policies Capital expenditures Capital Expenditure, Discontinued Operations Other liabilities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other Operating Segments Operating Segments [Member] Total Current Liabilities Liabilities, Current Asset retirement obligations and other liabilities purchase accounting adjustments Asset Retirement Obligations And Other Liabilities Purchase Accounting Adjustments Asset retirement obligations and other liabilities purchase accounting adjustments. Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest, Total (Loss) Earnings attributable to noncontrolling interests Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest Business Acquisition, Acquiree Business Acquisition, Acquiree [Domain] Operating lease right-of-use assets Disposal Group Including Discontinued Operation Lease Right Of Use Assets Disposal group, including discontinued operation, lease right-of-use assets. Interest Expense, Total Interest expense Interest Expense Proceeds from Sale of Equity Method Investments Interest payable Long-term debt, fair values Long-Term Debt, Fair Value Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent, Total Net earnings from continuing operations attributable to Martin Marietta Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent Corporate Corporate, Non-Segment [Member] Variable Rate Variable Rate [Axis] Entity Small Business Entity Small Business Nonrecurring gains on divested assets Nonrecurring Gains On Divested Assets Nonrecurring gains on divested assets Reportable business segments Reportable business segments Number of Reportable Segments 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 Reclassification out of Accumulated Other Comprehensive Income Reclassification out of Accumulated Other Comprehensive Income [Member] Total Current Assets Assets, Current Property, Plant and Equipment [Line Items] Summary of Information About the Company's Contract Balances Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block] Revenues and Gross Profit Revenues And Gross Profit [Text Block] Revenues and gross profit. Line of credit facility, increased borrowing capacity, subject to lender commitments Line Of Credit Facility Increased Borrowing Capacity Subject To Lender Commitments Line of credit facility increased borrowing capacity subject to lender commitments. Weighted Average Number of Shares Outstanding, Basic, Total Basic weighted-average common shares outstanding Basic Weighted Average Number of Shares Outstanding, Basic City Area Code City Area Code Schedule of Components of Net Periodic Benefit Cost (Credit) Schedule of Net Benefit Costs [Table Text Block] West Group West Group [Member] West group. Reportable Subsegments Reportable Subsegments [Member] Total Liabilities Liabilities Document Period End Date Document Period End Date Guarantee of affiliate's obligations Guarantor Obligations, Maximum Exposure, Undiscounted Net periodic benefit cost (credit) Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Schedule of Company's Total Revenues by Category for each Reportable Segment Schedule Of Revenue By Category For Reportable Segment Table [Text Block] Schedule of revenue by category for reportable segment. Payments for (Proceeds from) Policy Loans, Total Repayment of loans related to life insurance policies Payments for (Proceeds from) Policy Loans Balance at beginning of period, Pension and Postretirement Benefit Plans Balance at end of period, Pension and Postretirement Benefit Plans Accumulated Other Comprehensive Loss Noncurrent Deferred Tax Assets Pension And Postretirement Benefit Plans Accumulated other comprehensive loss, noncurrent deferred tax assets, pension and postretirement benefit plans. Financial Data for Continuing Operation for Company's Reportable Business Segments Schedule of Segment Reporting Information, by Segment [Table Text Block] Statistical Measurement Statistical Measurement [Axis] Schedule Of Product Information [Table] Schedule of Product Information [Table] Corporate headquarters member. Corporate Headquarters [Member] Corporate Headquarters [Member] Other current assets Other Assets, Current Stockholders' Equity Attributable to Noncontrolling Interest, Ending Balance Stockholders' Equity Attributable to Noncontrolling Interest, Beginning Balance Stockholders' Equity Attributable to Noncontrolling Interest, Total Noncontrolling interests Stockholders' Equity Attributable to Noncontrolling Interest Policy Elections Policy Elections Policy [Text Block] Policy elections. Amortization or depreciation expense Depreciation and Amortization, Discontinued Operations Total Assets Assets Contract with Customer, Asset, after Allowance for Credit Loss, Total Costs in excess of billings Contract with Customer, Asset, after Allowance for Credit Loss 3.450% Senior Notes, Due 2027 Three Point Four Five Percent Senior Notes Due Twenty Twenty Seven [Member] Three point four five percent senior notes due twenty twenty seven. Conduit Lenders Conduit Lenders [Member] conduit lenders. Other Nonoperating Income, Net Other Nonoperating Income (Expense) [Member] Other Nonoperating (Income) and Expenses, Net Long-term Debt, Excluding Current Maturities, Total Long-term debt Long-Term Debt, Excluding Current Maturities Diluted attributable to common shareholders Earnings Per Share, Diluted Diluted attributable to common shareholders Retirement Plan Type Retirement Plan Type [Axis] Cement and California Ready Mix Businesses Discontinued Operations [Member] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Debt issuance and extinguishment costs Debt issuance and extinguishment costs Payment for Debt Extinguishment or Debt Prepayment Cost Document Fiscal Period Focus Document Fiscal Period Focus Subsegments Consolidation Items Subsegments Consolidation Items [Domain] Restricted Cash, Total Restricted cash Restricted Cash Cost of Goods and Services Sold, Total Total Cost of Revenues Cost of Goods and Services Sold Significant Accounting Policies Organization, Consolidation, Basis of Presentation, Business Description and Accounting Policies [Text Block] Accounts receivable, net Increase (Decrease) in Accounts Receivable Pension Pension Plan [Member] Revolving Facility Revolving Credit Facility [Member] 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 APIC, Share-based Payment Arrangement, Increase for Cost Recognition, Total Stock-based compensation expense APIC, Share-Based Payment Arrangement, Increase for Cost Recognition Goodwill, Written off Related to Sale of Business Unit Divestitures Divestitures Other investing activities, net Payments for (Proceeds from) Other Investing Activities Incremental Common Shares Attributable to Share-based Payment Arrangements, Total Effect of dilutive employee and director awards Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements Building Materials Business Building Materials Business Building Materials Business [Member] Building materials business. Cash Provided by (Used in) Investing Activities, Discontinued Operations Cash investing activities related to discontinued operations Organization Organization Policy [Text Block] Organization policy. Number of states with aggregates business sales by destination Number Of States With Aggregates Business Sales By Destination Number of states with aggregates business sales by destination. Net Cash Provided by (Used in) Financing Activities Net Cash (Used for) Provided by Financing Activities Revenue Recognition [Line Items] Revenue Recognition [Line Items] Revenue recognition. California CALIFORNIA Statement of Financial Position [Abstract] Disposal Group Classification Disposal Group Classification [Axis] Entity File Number Entity File Number Summary of Discontinued Operations and Assets and Liabilities Held for Sale Disposal Groups, Including Discontinued Operations [Table Text Block] Statement of Cash Flows [Abstract] Total reclassifications out of accumulated other comprehensive loss before taxes Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, before Tax Line of Credit Facility, Current Borrowing Capacity Line of credit, trade receivable securitization facility Assets: Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets [Abstract] Pension and Postretirement Benefits Retirement Benefits [Text Block] Geographical Geographical [Domain] Other operating income, net Other Operating Income (Expense), Net Statistical Measurement Statistical Measurement [Domain] Statement of Stockholders' Equity [Abstract] Other Notes Other Notes [Member] Other notes. Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] Consolidated Comprehensive Earnings (Loss) : Reclassification out of Accumulated Other Comprehensive Income Reclassification out of Accumulated Other Comprehensive Income [Axis] Disposal Group, Including Discontinued Operation, Liabilities, Current, Total Total current liabilities held for sale Current liabilities held for sale Disposal Group, Including Discontinued Operation, Liabilities, Current Proceeds from exercise of stock options Proceeds from Stock Options Exercised Long-term Debt, Type Long-Term Debt, Type [Axis] Goodwill reclassified from allocated to assets held for sale. Goodwill Reclassified from Allocated to Assets Held for Sale Goodwill reclassified from assets held for sale Deferred Income Tax Expense (Benefit), Total Deferred income taxes, net Deferred Income Tax Expense (Benefit) 7% Debentures, Due 2025 Seven Percent Debentures Due Twenty Twenty Five [Member] Seven percent debentures due twenty twenty five. Deferred Income Tax Liabilities, Net, Total Deferred income taxes, net Deferred Income Tax Liabilities, Net Asset retirement obligations Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Asset Retirement Obligations Business combination recognized identifiable assets acquired and liabilities assumed asset retirement obligations. Revenue Recognition Revenue from Contract with Customer [Text Block] Actuarial loss Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax 2.500% Senior Notes, Due 2030 Two Point Five Zero Zero Percent Senior Notes Due Twenty Thirty [Member] Two point five zero zero percent senior notes due twenty thirty. Total revenues Disposal Group, Including Discontinued Operation, Revenue Credit facility commitment Line of Credit Facility, Maximum Borrowing Capacity Subsegments Subsegments [Axis] Preferred stock, par value Preferred Stock, Par or Stated Value Per Share Maturity year Debt Instrument Maturity Date Year Debt instrument maturity date year. Total consideration Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net Credit Facility Credit Facility [Domain] Business combination, effective date Business Acquisition Effective Date Of Acquisition Month And Year Business acquisition effective date of acquisition month and year. Diluted weighted-average common shares outstanding Diluted Weighted Average Number of Shares Outstanding, Diluted Total Revenues and Gross Profit (Loss) by Product Line Schedule Of Entity Wide Revenue And Gross Profit From External Customers By Products And Services [Text Block] Schedule of entity wide revenue and gross profit from external customers by products and services. Financial Instruments Disclosure [Abstract] Financial instruments disclosure. Credit Facility Credit Facility [Axis] Supplemental Disclosures of Cash Flow Information Schedule of Cash Flow, Supplemental Disclosures [Table Text Block] Current Fiscal Year End Date Current Fiscal Year End Date Interest Payable Restricted investments Restricted Investments Business combination acquisition and integration related costs. Business Combination Acquisition and Integration Related Costs Acquisition and integration expenses Due from affiliate Guarantee Obligations Outstanding Guarantee obligations outstanding. Repurchases of common stock, Shares Stock Repurchased During Period, Shares Other Assets, Noncurrent, Total Other noncurrent assets Other Assets, Noncurrent Total Equity Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Beginning Balance, Total Equity Ending Balance, Total Equity Entity Address, Address Line One Entity Address, Address Line One Repayments of Long-Term Debt, Total Repayments of Long-Term Debt Repayments of debt Repayments of debt Cement Cement [Member] Cement. Noncontrolling Interests Noncontrolling Interest [Member] Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Table] Disposal Groups, Including Discontinued Operations [Table] Gain (Loss) on Repurchase of Debt Instrument Gain on repurchase of bond Restricted Investments Investment, Policy [Policy Text Block] Business Combinations, Discontinued Operations, Divestitures and Assets and Liabilities Held for Sale Business combinations divestitures and discontinued operations text block Business Combinations Divestitures And Discontinued Operations Text Block Income Tax Expense (Benefit), Total Tax benefit Income tax expense Income Tax Expense (Benefit) Senior Notes [Member] Senior Notes Income Taxes Income Tax Disclosure [Text Block] Payments to Acquire Property, Plant, and Equipment, Total Additions to property, plant and equipment Payments to Acquire Property, Plant, and Equipment Future revenues from unsatisfied performance obligations Revenue, Remaining Performance Obligation, Amount Income Tax Disclosure [Abstract] Total noncurrent assets held for sale Noncurrent assets held for sale Disposal Group, Including Discontinued Operation, Assets, Noncurrent Other Operating Income and Expense [Text Block] Other Operating Income, Net Products and Services Products And Services [Member] Products and services. Intangible assets fair value adjustment Intangible Assets Fair Value Adjustment Excluding Goodwill Intangible assets fair value adjustment excluding goodwill. Asphalt and Paving Asphalt And Paving [Member] Asphalt and paving. Goodwill and Intangible Assets Disclosure [Abstract] Prior service cost (credit) Defined Benefit Plan, Amortization of Prior Service Cost (Credit) Product and freight revenues customer payment terms Product And Freight Revenues Customer Payment Terms Product and freight revenues customer payment terms. Equity [Abstract] Revenue recognized from contract liabilities Contract with Customer, Liability, Revenue Recognized Pretax gain (loss) on divestiture Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax Financial Instruments Financial Instruments Disclosure [Text Block] Southern Crushed Concrete Southern Crushed Concrete [Member] Southern Crushed Concrete. Earnings from Operations Earnings (Loss) from operations Operating Income (Loss) Interest rate on notes Debt Instrument, Interest Rate, Stated Percentage Additional Paid in Capital, Common Stock, Ending Balance Additional Paid in Capital, Common Stock, Beginning Balance Additional paid-in capital Additional Paid in Capital, Common Stock Payments to Acquire Businesses, Net of Cash Acquired, Total Acquisitions, net of cash acquired Payments to Acquire Businesses, Net of Cash Acquired Business combination number of California ready mix operations Business Combination Number Of California Ready Mix Operations Business combination number of California ready mix operations. Concentration Risk Benchmark Concentration Risk Benchmark [Domain] Trade Receivable Facility Trade Receivable Credit Facility [Member] Trade receivable credit facility. Entity Filer Category Entity Filer Category Consolidated Comprehensive Earnings (Loss) Comprehensive Income (Loss) [Table Text Block] Prior service cost Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, before Tax Other comprehensive earnings (loss), net of tax Other comprehensive earnings (loss), net of tax Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment, Total Property, plant and equipment Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment Entity Current Reporting Status Entity Current Reporting Status Total Inventories, net Inventory, Net Inventories, Net Inventory Disclosure [Text Block] Settlement charge Other Comprehensive Income (Loss), Defined Benefit Plan, Transition Asset (Obligation), Reclassification Adjustment from AOCI, before Tax Other assets Disposal Group, Including Discontinued Operation, Other Assets, Noncurrent Restricted Cash and Cash Equivalents [Abstract] Business Combinations [Abstract] Total Shareholders' Equity Stockholders' Equity Attributable to Parent Beginning Balance Ending Balance Accumulated Other Comprehensive Loss AOCI Attributable to Parent [Member] Entity Tax Identification Number Entity Tax Identification Number Income Statement Location Income Statement Location [Axis] Common stock, par value $0.01 per share (62.1 shares and 62.4 shares outstanding at September 30, 2022 and December 31, 2021, respectively) Common Stock, Value, Issued, Ending Balance Common Stock, Value, Issued, Beginning Balance Common Stock, Value, Issued, Total Common Stock, Value, Issued Consolidation Items Consolidation Items [Axis] Retained Earnings (Accumulated Deficit), Ending Balance Retained Earnings (Accumulated Deficit), Beginning Balance Retained Earnings (Accumulated Deficit), Total Retained earnings Retained Earnings (Accumulated Deficit) Inventory Valuation Reserves, Ending Balance Inventory Valuation Reserves, Beginning Balance Less: Allowances Inventory Valuation Reserves Equity Components Equity Components [Axis] Due from affiliate Due from Affiliates Excluding Acquisition Bridge Debt Excluding Acquisition Bridge Debt [Member] Excluding acquisition bridge debt. Contract with Customer, Liability, Total Billings in excess of costs Contract with Customer, Liability East Group East Group [Member] East group. 3.200% Senior Notes, Due 2051 Three Point Two Zero Zero Percent Senior Notes Due Twenty Fifty One [Member] Three point two zero zero percent senior notes, due twenty fifty one. Basic and diluted net earnings from continuing operations available to common shareholders attributable to Martin Marietta Basic And Diluted Net Income Loss From Continuing Operations Attributable To Common Shareholders Of Reporting Entity Basic and diluted net income loss from continuing operations attributable to common shareholders of reporting entity. Entity Emerging Growth Company Entity Emerging Growth Company Schedule Of Business Acquisitions By Acquisition [Table] Schedule of Business Acquisitions, by Acquisition [Table] Interest cost Defined Benefit Plan, Interest Cost Diluted from continuing operations attributable to common shareholders Income (Loss) from Continuing Operations, Per Diluted Share Number of States in which Entity Operates Number of states in which entity operates Goodwill [Line Items] Goodwill [Line Items] Retirement Plan Type Retirement Plan Type [Domain] Commitments and Contingencies [Line Items] Commitments And Contingencies [Line Items] Commitments and contingencies. 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 Diluted from discontinued operations attributable to common shareholders Performance obligations, description of timing Revenue, Performance Obligation, Description of Timing Construction [Member] Construction [Member] Service cost Defined Benefit Plan, Service Cost Retirement Benefits [Abstract] Goodwill allocated to assets held for sale Goodwill Allocated To Assets Held For Sale Goodwill allocated to assets held for sale. Document Transition Report Document Transition Report Depreciation, Depletion and Amortization, Total Depreciation, depletion and amortization Depreciation, Depletion and Amortization Schedule Of Segment Reporting Information By Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Changes in Accumulated Other Comprehensive Loss Net of Tax Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block] Accumulated Other Comprehensive Income (Loss), Net of Tax, Total Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Accounts Receivable, after Allowance for Credit Loss, Current, Total Accounts receivable, net Accounts Receivable, after Allowance for Credit Loss, Current Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Magnesia Specialties Magnesia Specialties [Member] Magnesia specialties. Other Comprehensive Income (Loss), Net of Tax, Total Other comprehensive earnings / loss, net of tax Other Comprehensive Income (Loss), Net of Tax Supplemental Cash Flow Information Cash Flow, Supplemental Disclosures [Text Block] Net Earnings Attributable to Martin Marietta Net earnings attributable to Martin Marietta Net Income (Loss) Attributable to Parent Significant Accounting Policies [Line Items] Significant Accounting Policies [Line Items] Significant accounting policies. Operating lease liabilities Operating Lease, Liability, Current Additional Paid-in Capital Additional Paid-in Capital [Member] Shares withheld for employees' income tax obligations Payment, Tax Withholding, Share-Based Payment Arrangement Debt instrument maturity period Line of Credit Facility, Expiration Date Entity Registrant Name Entity Registrant Name 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 Property, plant and equipment Disposal Group, Including Discontinued Operation, Property, Plant and Equipment, Noncurrent Maturity date Debt Instrument, Maturity Date Share-based Payment Arrangement, Noncash Expense, Total Stock-based compensation expense Share-Based Payment Arrangement, Noncash Expense Statement of Comprehensive Income [Abstract] 4.250% Senior Notes, Due 2047 Four Point Two Five Zero Percent Senior Notes Due Twenty Fourty Seven [Member] Four point two five zero percent senior notes due twenty fourty seven. Property, Plant and Equipment, Net, Ending Balance Property, Plant and Equipment, Net, Beginning Balance Net property, plant and equipment Property, Plant and Equipment, Net Statement [Line Items] Statement [Line Items] Product Information [Line Items] Product Information [Line Items] 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 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 Earnings from discontinued operations, net of income tax expense Goodwill Increased Goodwill, Purchase Accounting Adjustments Assumed asset retirement obligations liability Title of 12(b) Security Title of 12(b) Security Debt covenant Ratio Of Consolidated Net Debt To Earnings Before Interest Taxes Depreciation Depletion And Amortization Ratio of consolidated net debt to earnings before interest taxes depreciation depletion and amortization. CALIFORNIA and COLORADO California And Colorado [Member] California and Colorado. Common Stock Common Stock [Member] Restricted Cash Cash and Cash Equivalents, Restricted Cash and Cash Equivalents, Policy [Policy Text Block] Condensed Income Statement [Table] Cash Flows from Operating Activities: Net Cash Provided by (Used in) Operating Activities [Abstract] Equity Component Equity Component [Domain] Service revenues Revenue from Contract with Customer, Excluding Assessed Tax, Total Total Total Revenues Earnings from continuing operations before income tax expense Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Reconciliation of Cash, Cash Equivalents and Restricted Cash Schedule of Cash and Cash Equivalents [Table Text Block] Entity Address, State or Province Entity Address, State or Province Geographical Geographical [Axis] Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax Pretax earnings Net (Decrease) Increase in Cash, Cash Equivalents and Restricted Cash Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect 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 Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Document Type Document Type Cash paid for interest, net of capitalized amount Interest Paid, Excluding Capitalized Interest, Operating Activities Goodwill Goodwill Disclosure [Text Block] Significant Accounting Policies [Table] Significant Accounting Policies [Table] Significant accounting policies. Actuarial loss (gain) Defined Benefit Plan, Amortization of Gain (Loss) Entity Shell Company Entity Shell Company Increase (Decrease) in Inventories, Total Inventories, net Increase (Decrease) in Inventories Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Supplies and expendable parts Other Inventory, Supplies, Gross Proceeds from Divestiture of Businesses Proceeds from divestitures Intangible assets, excluding goodwill Disposal Group, Including Discontinued Operation, Intangible Assets, Noncurrent Schedule Of Business Combinations And Dispositions [Table] Schedule Of Business Combinations And Dispositions [Table] Schedule of business combinations and dispositions table. Reclassification Out Of Accumulated Other Comprehensive Income [Table] Reclassification out of Accumulated Other Comprehensive Income [Table] Equity: Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] Security Exchange Name Security Exchange Name Revenue from Contract with Customer [Abstract] Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent Earnings from discontinued operations, net of income tax expense SOFR SOFR [Member] SOFR [Member] Interest-only loan receivable Interest Only Loan Receivable [Member] Interest only loan receivable. Net Cash Provided by Operating Activities Net Cash Provided by (Used in) Operating Activities Cash transferred in business combination Payments to Acquire Businesses, Gross Commitments and Contingencies Disclosure [Abstract] Shares withheld for employees' income tax obligations Share-Based Payment Arrangement, Decrease for Tax Withholding Obligation Accrued interest Interest Payable, Current Ready Mixed Concrete Ready Mixed Concrete [Member] Ready mixed concrete. Discount rate for remeasurement Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate Aggregates Aggregates [Member] Aggregates. Total assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets Valuation allowance for loss on sale Disposal Group Including Discontinued Operation Valuation Allowance For Loss On Sale Disposal group, including discontinued operation, valuation allowance for loss on sale. Liabilities: Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities [Abstract] Schedule Of Defined Benefit Plans Disclosures [Table] Schedule of Defined Benefit Plans Disclosures [Table] Common stock, shares outstanding Beginning Balance (in shares) Ending Balance (in shares) Common Stock, Shares, Outstanding Business Acquisition [Line Items] Business Acquisition [Line Items] Products in process Inventory, Work in Process, Gross Change in fair value of asset retirement obligations Increase Decrease in Fair value of Asset Retirement Obligations Increase decrease in fair value of asset retirement obligations Long-Term Debt Debt Disclosure [Text Block] 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. Proceeds from Issuance of Long-Term Debt, Total Proceeds from Issuance of Long-Term Debt Borrowings of debt Cash Flows from Investing Activities: Net Cash Provided by (Used in) Investing Activities [Abstract] Number of quarries and yards Number Of Quarries And Yards Number of quarries and yards. Variable Rate Variable Rate [Domain] Minimum Minimum [Member] Segments Segments [Domain] Customer payments terms based on contractual billing Customer Payment Terms Based On Contractual Billing Customer payment terms based on contractual billing. Debt Instrument Debt Instrument [Axis] Earnings from continuing operations Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] Segments Segments [Axis] Other Noncash Income (Expense), Total Other items, net Other Noncash Income (Expense) Other Nonoperating Income (Expense), Total Other nonoperating income, net Other Nonoperating Income (Expense) Current maturities of discharged long-term debt Long-term Debt, Current Maturities, Total Less: Current maturities Long-Term Debt, Current Maturities Discontinued Operations and Disposal Groups [Abstract] Discontinued Operation, Income (Loss) from Discontinued Operation During Phase-out Period, before Income Tax Pretax earnings from operations Income tax expense Discontinued Operation, Tax Effect of Discontinued Operation, Total Discontinued Operation, Tax Effect of Discontinued Operation Income tax expense Entity Central Index Key Entity Central Index Key Other Income and Expenses [Abstract] Maximum consolidated debt reduction for unrestricted cash and temporary investments Maximum Consolidated Debt Reduction For Unrestricted Cash And Cash Equivalents For Debt Covenant Calculation Maximum consolidated debt reduction for unrestricted cash and cash equivalents for debt covenant calculation. Right-of-use assets obtained in exchange for new finance lease liabilities Right-of-Use Asset Obtained in Exchange for Finance Lease Liability Accounting Policies [Abstract] Tax effect of other comprehensive loss (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. 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 Property, Plant and Equipment [Table] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis] Other intangibles, net Other Intangible Assets, Net Consolidation Items Consolidation Items [Domain] Lease obligations Disposal Group Including Discontinued Operation Lease Obligations Noncurrent Disposal group, including discontinued operation, lease obligations noncurrent. 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. Payments on finance lease obligations Finance Lease, Principal Payments 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. Right-of-use assets obtained in exchange for new operating lease liabilities Right-of-Use Asset Obtained in Exchange for Operating Lease Liability 4.25% Senior Notes, Due 2024 Four Point Two Five Percent Senior Notes Due Twenty Twenty Four [Member] Four point two five percent senior notes due twenty twenty four. Adjustments to reconcile consolidated net earnings to net cash provided by operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Retained Earnings Retained Earnings [Member] Remeasurement of operating lease right-of-use assets Remeasurement Of Operating Leases Right Of Use Assets Remeasurement of operating leases right of use assets. Segment Reporting [Abstract] Effective Income Tax Rate Reconciliation, Percent, Total Effective income tax rates for continuing operations Effective Income Tax Rate Reconciliation, Percent Schedule Of Goodwill [Table] Schedule of Goodwill [Table] Disposal Group, Including Discontinued Operation, Consideration Total Revenues 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 Goodwill, Acquired During Period Acquisitions Condensed Income Statements, Captions [Line Items] Performance obligations, period Performance Obligation Period Performance obligation period. Lease obligations Disposal Group Including Discontinued Operation Lease Obligations Current Disposal group, including discontinued operation, lease obligations current. Entity Interactive Data Current Entity Interactive Data Current Description of pension plan Defined Benefit Plan, Assumptions Used in Calculation, Description Outstanding letters of credit Letters of Credit Outstanding, Amount Affiliate line of credit facility maturity period Affiliate Line of Credit Facility Maturity Period Line of credit maturity period Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill, Total Intangible assets, other than goodwill Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill Payments of Ordinary Dividends, Noncontrolling Interest Distributions to owners of noncontrolling interest Distributions to owners of noncontrolling interest Reclassification out of Accumulated Other Comprehensive Income Reclassification out of Accumulated Other Comprehensive Income [Domain] Gain (Loss) on Sale of Assets and Asset Impairment Charges Gain or loss on sale of asset Discontinued Operations Discontinued Operations, Held-for-sale [Member] Local Phone Number Local Phone Number Basic and Diluted Earnings from Continuing Operations Per Common Share Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Revenues And Gross Profit [Abstract] Revenues and gross profit. Debt Disclosure [Abstract] Net Income (Loss) Attributable to Noncontrolling Interest, Total Less: Net (loss) earnings attributable to noncontrolling interests Net Income (Loss) Attributable to Noncontrolling Interest Basis of Presentation Basis of Accounting, Policy [Policy Text Block] Other Nonoperating Income and Expense [Text Block] Other Nonoperating Income, Net Schedule of Noncash Investing and Financing Activities Schedule of Other Significant Noncash Transactions [Table Text Block] Other Liabilities, Noncurrent, Total Other noncurrent liabilities Other Liabilities, Noncurrent Income Statement Location Income Statement Location [Domain] Total liabilities Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities Other Operating Income (Expense) [Member] Other Operating Income (Expense) [Member] Total debt Long-term debt, carrying values Long-Term Debt Inventory Disclosure [Abstract] Customer Concentration Risk Customer Concentration Risk [Member] Operating and finance lease liabilities Business Combination, Recognized Identifiable Asset Acquired and Liability Assumed, Lease Obligation 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. Debt Instrument, Name Debt Instrument, Name [Domain] Document Fiscal Year Focus Document Fiscal Year Focus Accrued other taxes Accrued Other Taxes Current Accrued other taxes current. Gain loss on disposition of assets and extinguishment of debt Gain Loss On Disposition Of Assets And Extinguishment of Debt Gain on divestitures, sales of assets and extinguishment of debt Goodwill Increased Goodwill, Period Increase (Decrease) Goodwill, Period Increase (Decrease), Total Summary of Estimated Fair Values of Assets Acquired and Liabilities Assumed Schedule of Business Acquisitions, by Acquisition [Table Text Block] Basic attributable to common shareholders Earnings Per Share, Basic Basic attributable to common shareholders Income (Loss) from Continuing Operations, Per Outstanding Share, Total Basic from continuing operations attributable to common shareholders Income (Loss) from Continuing Operations, Per Basic Share Dividends declared Common Stock, Dividends, Per Share, Declared Dividends declared Dividends, Common Stock, Cash Goodwill Disposal Group, Including Discontinued Operation, Goodwill, Noncurrent ASSETS Assets [Abstract] Business Combinations [Line Items] Business Combinations [Line Items] Business combinations. Gross Profit Gross profit (loss) Gross Profit Cash used for operating and investing activities for discontinued operations Cash Used For Operating And Investing Activities For Discontinued Operations Cash used for operating and investing activities for discontinued operations. Proceeds from divestitures and sales of assets Proceeds from Sales of Business, Affiliate and Productive Assets Long-Term Debt Schedule of Long-Term Debt Instruments [Table Text Block] Senior unsecured revolving facility, maturity period Line of Credit Facility, Expiration Period Debt instrument, face amount Debt Instrument, Face Amount Other assets Disposal Group, Including Discontinued Operation, Other Assets, Current Long-Lived Tangible Asset [Axis] Concentration Risk Benchmark Concentration Risk Benchmark [Axis] LIABILITIES AND EQUITY Liabilities and Equity [Abstract] Land [Member] Land [Member] Inventories, Gross Inventory, Gross Income Taxes Paid, Net, Total Cash paid for income taxes, net of refunds Income Taxes Paid, Net Remeasurement of finance lease right-of-use assets Remeasurement Of Finance Lease Right Of Use Assets Remeasurement of finance lease right-of-use assets. Accounts payable Increase (Decrease) in Accounts Payable, Trade Consolidated net earnings (loss) Consolidated net earnings Consolidated net earnings Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Current Assets: Assets, Current [Abstract] Freight Cargo and Freight [Member] Other comprehensive loss, before reclassifications, net of tax Other comprehensive (loss) earnings before reclassifications, net of tax Other Comprehensive Income (Loss), before Reclassifications, Net of Tax Business Segments Segment Reporting Disclosure [Text Block] Changes in Goodwill Schedule of Goodwill [Table Text Block] Inventories, net Disposal Group, Including Discontinued Operation, Inventory, Current Supplemental Cash Flow Elements [Abstract] Changes in operating assets and liabilities, net of effects of acquisitions and divestitures: Increase (Decrease) in Operating Capital [Abstract] Subsegments Consolidation Items Subsegments Consolidation Items [Axis] 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. Cover [Abstract] Percentage of concentration risk Concentration Risk, Percentage Product and Service Product and Service [Domain] Inventory, Finished Goods, Gross, Total Finished products Inventory, Finished Goods, Gross Current Liabilities: Liabilities, Current [Abstract] Maximum Maximum Maximum [Member] Number of cement plants Number Of Cement Plants Number of cement plants. Disposal Group, Including Discontinued Operation, Liabilities, Noncurrent, Total Total noncurrent liabilities held for sale Noncurrent liabilities held for sale Disposal Group, Including Discontinued Operation, Liabilities, Noncurrent Net Cash Used for Investing Activities Net Cash Provided by (Used in) Investing Activities Schedule of Inventories Net Schedule of Inventory, Current [Table Text Block] Commitments And Contingencies [Table] Commitments And Contingencies [Table] Commitments and contingencies. Pension and Postretirement Benefit Plans Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] Basis spread on variable rate Debt Instrument, Basis Spread on Variable Rate Accounts Receivable Accounts Receivable [Member] Change in fair value of other liabilities Other Liabilities Fair Value Adjustment Other liabilities fair value adjustment. Settlement charge Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement Trading Symbol Trading Symbol Restricted investments discharge amount Restricted Investments To Discharge Long Term Debt Restricted investments to discharge long term debt. Real Estate, Land, Held-for-Sale Investment land Reclassification Out of Accumulated Other Comprehensive Loss Reclassification out of Accumulated Other Comprehensive Income [Table 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] Colorado and Central Texas Colorado and Central Texas [Member] Colorado and Central Texas Parent Total Shareholders' Equity Parent [Member] Selling, General and Administrative Expense, Total Selling, general & administrative expenses Selling, General and Administrative Expense Lehigh West Region Lehigh Hanson Incorporation West Region [Member] Lehigh Hanson, Incorporation West Region [Member] Consolidated comprehensive earnings attributable to Martin Marietta Comprehensive Income (Loss), Net of Tax, Attributable to Parent Accounts Payable, Current, Total Accounts payable Accounts Payable, Current Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss) [Line Items] Concentration Risk Type Concentration Risk Type [Domain] Long-Lived Tangible Asset [Domain] Distributions to owners of noncontrolling interest Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders 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 Basic from discontinued operations attributable to common shareholders Total current assets held for sale Disposal Group, Including Discontinued Operation, Assets, Current Current assets held for sale Common stock, par value Common Stock, Par or Stated Value Per Share Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property Gain on divestitures of the Colorado and Central Texas Gain on sale of investment Nonrecurring gains on divested assets Consolidated Comprehensive (Loss) Earnings and Accumulated Other Comprehensive Loss Comprehensive Income, Policy [Policy Text Block] Defined Benefit Plan Disclosure [Line Items] Defined Benefit Plan Disclosure [Line Items] Performance obligations, customer satisfaction period Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period Other assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets Debt Instrument [Line Items] Debt Instrument [Line Items] Long-term Debt, Type Long-Term Debt, Type [Domain] Expected return on assets Defined Benefit Plan, Expected Return (Loss) on Plan Assets Principal Amount Of Stock Repurchased During The Period Principal amount of stock repurchased during the period Principal amount of stock repurchased during the period.