3.26.1 html 155 288 1 true 51 0 false 8 false false R1.htm 75000 - Document - Document and Entity Information Sheet http://martinmarietta.com/20260331/taxonomy/role/Role_DocumentDocumentAndEntityInformation Document and Entity Information Cover 1 false false R2.htm 75010 - Statement - Consolidated Balance Sheets (Unaudited) Sheet http://martinmarietta.com/20260331/taxonomy/role/StatementConsolidatedBalanceSheetsUnaudited Consolidated Balance Sheets (Unaudited) Statements 2 false false R3.htm 75020 - Statement - Consolidated Balance Sheets (Parenthetical) (Unaudited) Sheet http://martinmarietta.com/20260331/taxonomy/role/StatementConsolidatedBalanceSheetsParentheticalUnaudited Consolidated Balance Sheets (Parenthetical) (Unaudited) Statements 3 false false R4.htm 75030 - Statement - Consolidated Statements of Earnings and Comprehensive Earnings (Unaudited) Sheet http://martinmarietta.com/20260331/taxonomy/role/Role_StatementConsolidatedStatementsOfEarningsAndComprehensiveEarningsUnaudited Consolidated Statements of Earnings and Comprehensive Earnings (Unaudited) Statements 4 false false R5.htm 75040 - Statement - Consolidated Statements of Cash Flows (Unaudited) Sheet http://martinmarietta.com/20260331/taxonomy/role/Role_StatementConsolidatedStatementsOfCashFlowsUnaudited Consolidated Statements of Cash Flows (Unaudited) Statements 5 false false R6.htm 75050 - Statement - Consolidated Statements of Total Equity (Unaudited) Sheet http://martinmarietta.com/20260331/taxonomy/role/Role_StatementConsolidatedStatementsOfTotalEquityUnaudited Consolidated Statements of Total Equity (Unaudited) Statements 6 false false R7.htm 75060 - Statement - Consolidated Statements of Total Equity (Parenthetical) (Unaudited) Sheet http://martinmarietta.com/20260331/taxonomy/role/Role_StatementConsolidatedStatementsOfTotalEquityParentheticalUnaudited Consolidated Statements of Total Equity (Parenthetical) (Unaudited) Statements 7 false false R8.htm 995410 - Disclosure - Pay vs Performance Disclosure Sheet http://xbrl.sec.gov/ecd/role/PvpDisclosure Pay vs Performance Disclosure Notes 8 false false R9.htm 995445 - Disclosure - Insider Trading Arrangements Sheet http://xbrl.sec.gov/ecd/role/InsiderTradingArrangements Insider Trading Arrangements Notes 9 false false R10.htm 995455 - Disclosure - Significant Accounting Policies Sheet http://martinmarietta.com/20260331/taxonomy/role/Role_DisclosureSignificantAccountingPolicies Significant Accounting Policies Notes 10 false false R11.htm 995465 - Disclosure - Business Combinations, Divestitures, Discontinued Operations and Assets and Liabilities Held for Sale Sheet http://martinmarietta.com/20260331/taxonomy/role/DisclosureBusinessCombinationsDivestituresDiscontinuedOperationsAndAssetsAndLiabilitiesHeldForSale Business Combinations, Divestitures, Discontinued Operations and Assets and Liabilities Held for Sale Notes 11 false false R12.htm 995475 - Disclosure - Goodwill and Other Intangible Assets Sheet http://martinmarietta.com/20260331/taxonomy/role/DisclosureGoodwillAndOtherIntangibleAssets Goodwill and Other Intangible Assets Notes 12 false false R13.htm 995485 - Disclosure - Inventories, Net Sheet http://martinmarietta.com/20260331/taxonomy/role/Role_DisclosureInventoriesNet Inventories, Net Notes 13 false false R14.htm 995495 - Disclosure - Debt Sheet http://martinmarietta.com/20260331/taxonomy/role/DisclosureDebt Debt Notes 14 false false R15.htm 995505 - Disclosure - Financial Instruments Sheet http://martinmarietta.com/20260331/taxonomy/role/Role_DisclosureFinancialInstruments Financial Instruments Notes 15 false false R16.htm 995515 - Disclosure - Income Taxes Sheet http://martinmarietta.com/20260331/taxonomy/role/Role_DisclosureIncomeTaxes Income Taxes Notes 16 false false R17.htm 995525 - Disclosure - Pension Benefits Sheet http://martinmarietta.com/20260331/taxonomy/role/DisclosurePensionBenefits Pension Benefits Notes 17 false false R18.htm 995535 - Disclosure - Commitments and Contingencies Sheet http://martinmarietta.com/20260331/taxonomy/role/Role_DisclosureCommitmentsAndContingencies Commitments and Contingencies Notes 18 false false R19.htm 995545 - Disclosure - Segments Sheet http://martinmarietta.com/20260331/taxonomy/role/DisclosureSegments1 Segments Notes 19 false false R20.htm 995555 - Disclosure - Revenues and Gross Profit Sheet http://martinmarietta.com/20260331/taxonomy/role/Role_DisclosureRevenuesAndGrossProfit Revenues and Gross Profit Notes 20 false false R21.htm 995565 - Disclosure - Supplemental Cash Flow Information Sheet http://martinmarietta.com/20260331/taxonomy/role/Role_DisclosureSupplementalCashFlowInformation Supplemental Cash Flow Information Notes 21 false false R22.htm 995575 - Disclosure - Subsequent Event Sheet http://martinmarietta.com/20260331/taxonomy/role/DisclosureSubsequentEvent Subsequent Event Notes 22 false false R23.htm 995585 - Disclosure - Significant Accounting Policies (Policies) Sheet http://martinmarietta.com/20260331/taxonomy/role/Role_DisclosureSignificantAccountingPoliciesPolicies Significant Accounting Policies (Policies) Policies http://martinmarietta.com/20260331/taxonomy/role/Role_DisclosureSignificantAccountingPolicies 23 false false R24.htm 995595 - Disclosure - Significant Accounting Policies (Tables) Sheet http://martinmarietta.com/20260331/taxonomy/role/Role_DisclosureSignificantAccountingPoliciesTables Significant Accounting Policies (Tables) Tables http://martinmarietta.com/20260331/taxonomy/role/Role_DisclosureSignificantAccountingPolicies 24 false false R25.htm 995605 - Disclosure - Business Combinations, Divestitures, Discontinued Operations and Assets and Liabilities Held for Sale (Tables) Sheet http://martinmarietta.com/20260331/taxonomy/role/DisclosureBusinessCombinationsDivestituresDiscontinuedOperationsAndAssetsAndLiabilitiesHeldForSaleTables Business Combinations, Divestitures, Discontinued Operations and Assets and Liabilities Held for Sale (Tables) Tables http://martinmarietta.com/20260331/taxonomy/role/DisclosureBusinessCombinationsDivestituresDiscontinuedOperationsAndAssetsAndLiabilitiesHeldForSale 25 false false R26.htm 995615 - Disclosure - Goodwill and Other Intangible Assets (Tables) Sheet http://martinmarietta.com/20260331/taxonomy/role/DisclosureGoodwillAndOtherIntangibleAssetsTables Goodwill and Other Intangible Assets (Tables) Tables http://martinmarietta.com/20260331/taxonomy/role/DisclosureGoodwillAndOtherIntangibleAssets 26 false false R27.htm 995625 - Disclosure - Inventories, Net (Tables) Sheet http://martinmarietta.com/20260331/taxonomy/role/Role_DisclosureInventoriesNetTables Inventories, Net (Tables) Tables http://martinmarietta.com/20260331/taxonomy/role/Role_DisclosureInventoriesNet 27 false false R28.htm 995635 - Disclosure - Debt (Tables) Sheet http://martinmarietta.com/20260331/taxonomy/role/DisclosureDebtTables Debt (Tables) Tables http://martinmarietta.com/20260331/taxonomy/role/DisclosureDebt 28 false false R29.htm 995645 - Disclosure - Pension Benefits (Tables) Sheet http://martinmarietta.com/20260331/taxonomy/role/DisclosurePensionBenefitsTables Pension Benefits (Tables) Tables http://martinmarietta.com/20260331/taxonomy/role/DisclosurePensionBenefits 29 false false R30.htm 995655 - Disclosure - Segments (Tables) Sheet http://martinmarietta.com/20260331/taxonomy/role/DisclosureSegmentsTables Segments (Tables) Tables http://martinmarietta.com/20260331/taxonomy/role/DisclosureSegments1 30 false false R31.htm 995665 - Disclosure - Revenues and Gross Profit (Tables) Sheet http://martinmarietta.com/20260331/taxonomy/role/Role_DisclosureRevenuesAndGrossProfitTables Revenues and Gross Profit (Tables) Tables http://martinmarietta.com/20260331/taxonomy/role/Role_DisclosureRevenuesAndGrossProfit 31 false false R32.htm 995675 - Disclosure - Supplemental Cash Flow Information (Tables) Sheet http://martinmarietta.com/20260331/taxonomy/role/Role_DisclosureSupplementalCashFlowInformationTables Supplemental Cash Flow Information (Tables) Tables http://martinmarietta.com/20260331/taxonomy/role/Role_DisclosureSupplementalCashFlowInformation 32 false false R33.htm 995685 - Disclosure - Significant Accounting Policies - Additional Information (Detail) Sheet http://martinmarietta.com/20260331/taxonomy/role/Role_DisclosureSignificantAccountingPoliciesAdditionalInformationDetail Significant Accounting Policies - Additional Information (Detail) Details 33 false false R34.htm 995695 - Disclosure - Significant Accounting Policies - Comprehensive Earnings Attributable to Martin Marietta Materials Incorporated (Detail) Sheet http://martinmarietta.com/20260331/taxonomy/role/DisclosureSignificantAccountingPoliciesComprehensiveEarningsAttributableToMartinMariettaMaterialsIncorporatedDetail Significant Accounting Policies - Comprehensive Earnings Attributable to Martin Marietta Materials Incorporated (Detail) Details 34 false false R35.htm 995705 - Disclosure - Significant Accounting Policies - Changes in Accumulated Other Comprehensive Earnings (Loss) Net of Tax (Detail) Sheet http://martinmarietta.com/20260331/taxonomy/role/DisclosureSignificantAccountingPoliciesChangesInAccumulatedOtherComprehensiveEarningsLossNetOfTaxDetail Significant Accounting Policies - Changes in Accumulated Other Comprehensive Earnings (Loss) Net of Tax (Detail) Details 35 false false R36.htm 995715 - Disclosure - Significant Accounting Policies - Noncurrent Deferred Tax Assets Recorded in Accumulated Other Comprehensive Earnings (Loss) (Detail) Sheet http://martinmarietta.com/20260331/taxonomy/role/DisclosureSignificantAccountingPoliciesNoncurrentDeferredTaxAssetsRecordedInAccumulatedOtherComprehensiveEarningsLossDetail Significant Accounting Policies - Noncurrent Deferred Tax Assets Recorded in Accumulated Other Comprehensive Earnings (Loss) (Detail) Details 36 false false R37.htm 995725 - Disclosure - Significant Accounting Policies - Reclassification Out of Accumulated Other Comprehensive Earnings (loss) (Detail) Sheet http://martinmarietta.com/20260331/taxonomy/role/DisclosureSignificantAccountingPoliciesReclassificationOutOfAccumulatedOtherComprehensiveEarningsLossDetail Significant Accounting Policies - Reclassification Out of Accumulated Other Comprehensive Earnings (loss) (Detail) Details 37 false false R38.htm 995735 - Disclosure - Significant Accounting Policies - Basic and Diluted Earnings from Continuing Operations Per Common Share (Detail) Sheet http://martinmarietta.com/20260331/taxonomy/role/Role_DisclosureSignificantAccountingPoliciesBasicAndDilutedEarningsFromContinuingOperationsPerCommonShareDetail Significant Accounting Policies - Basic and Diluted Earnings from Continuing Operations Per Common Share (Detail) Details 38 false false R39.htm 995745 - Disclosure - Business Combinations, Divestitures, Discontinued Operations and Assets and Liabilities Held for Sale - Additional Information (Detail) Sheet http://martinmarietta.com/20260331/taxonomy/role/DisclosureBusinessCombinationsDivestituresDiscontinuedOperationsAndAssetsAndLiabilitiesHeldForSaleAdditionalInformationDetail Business Combinations, Divestitures, Discontinued Operations and Assets and Liabilities Held for Sale - Additional Information (Detail) Details http://martinmarietta.com/20260331/taxonomy/role/DisclosureBusinessCombinationsDivestituresDiscontinuedOperationsAndAssetsAndLiabilitiesHeldForSaleTables 39 false false R40.htm 995755 - Disclosure - Business Combinations, Divestitures, Discontinued Operations and Assets and Liabilities Held for Sale - Summary of Preliminary Estimated Fair Values of Assets Acquired and Liabilities Assumed (Detail) Sheet http://martinmarietta.com/20260331/taxonomy/role/DisclosureBusinessCombinationsDivestituresDiscontinuedOperationsAndAssetsAndLiabilitiesHeldForSaleSummaryOfPreliminaryEstimatedFairValuesOf Business Combinations, Divestitures, Discontinued Operations and Assets and Liabilities Held for Sale - Summary of Preliminary Estimated Fair Values of Assets Acquired and Liabilities Assumed (Detail) Details 40 false false R41.htm 995765 - Disclosure - Business Combinations, Divestitures, Discontinued Operations and Assets and Liabilities Held for Sale - Summary of Preliminary Estimated Fair Values of Assets Acquired and Liabilities Assumed (Parenthetical) (Detail) Sheet http://martinmarietta.com/20260331/taxonomy/role/DisclosureBusinessCombinationsDivestituresDiscontinuedOperationsAndAssetsAndLiabilitiesHeldForSaleSummaryOfPreliminaryEstimatedFairValuesOf1 Business Combinations, Divestitures, Discontinued Operations and Assets and Liabilities Held for Sale - Summary of Preliminary Estimated Fair Values of Assets Acquired and Liabilities Assumed (Parenthetical) (Detail) Details 41 false false R42.htm 995775 - Disclosure - Business Combinations, Divestitures, Discontinued Operations and Assets and Liabilities Held for Sale - Summary of Unaudited Pro Forma Financial Information (Detail) Sheet http://martinmarietta.com/20260331/taxonomy/role/DisclosureBusinessCombinationsDivestituresDiscontinuedOperationsAndAssetsAndLiabilitiesHeldForSaleSummaryOfUnauditedProFormaFinancialInform Business Combinations, Divestitures, Discontinued Operations and Assets and Liabilities Held for Sale - Summary of Unaudited Pro Forma Financial Information (Detail) Details 42 false false R43.htm 995785 - Disclosure - Business Combinations, Divestitures, Discontinued Operations and Assets and Liabilities Held for Sale - Summary of Discontinued Operations (Detail) Sheet http://martinmarietta.com/20260331/taxonomy/role/DisclosureBusinessCombinationsDivestituresDiscontinuedOperationsAndAssetsAndLiabilitiesHeldForSaleSummaryOfDiscontinuedOperationsDetail Business Combinations, Divestitures, Discontinued Operations and Assets and Liabilities Held for Sale - Summary of Discontinued Operations (Detail) Details 43 false false R44.htm 995805 - Disclosure - Business Combinations, Divestitures, Discontinued Operations and Assets and Liabilities Held for Sale - Summary of Assets and Liabilities held for Sale (Detail) Sheet http://martinmarietta.com/20260331/taxonomy/role/DisclosureBusinessCombinationsDivestituresDiscontinuedOperationsAndAssetsAndLiabilitiesHeldForSaleSummaryOfAssetsAndLiabilitiesHeldForSale Business Combinations, Divestitures, Discontinued Operations and Assets and Liabilities Held for Sale - Summary of Assets and Liabilities held for Sale (Detail) Details 44 false false R45.htm 995835 - Disclosure - Goodwill and Other Intangible Assets - Changes in Goodwill (Detail) Sheet http://martinmarietta.com/20260331/taxonomy/role/DisclosureGoodwillAndOtherIntangibleAssetsChangesInGoodwillDetail Goodwill and Other Intangible Assets - Changes in Goodwill (Detail) Details 45 false false R46.htm 995845 - Disclosure - Goodwill and Other Intangible Assets - Intangible Assets acquired (Details) Sheet http://martinmarietta.com/20260331/taxonomy/role/DisclosureGoodwillAndOtherIntangibleAssetsIntangibleAssetsAcquiredDetails Goodwill and Other Intangible Assets - Intangible Assets acquired (Details) Details 46 false false R47.htm 995855 - Disclosure - Inventories, Net - Schedule of Inventories Net (Detail) Sheet http://martinmarietta.com/20260331/taxonomy/role/Role_DisclosureInventoriesNetScheduleOfInventoriesNetDetail Inventories, Net - Schedule of Inventories Net (Detail) Details 47 false false R48.htm 995865 - Disclosure - Debt - Long-Term Debt (Detail) Sheet http://martinmarietta.com/20260331/taxonomy/role/DisclosureDebtLongtermDebtDetail Debt - Long-Term Debt (Detail) Details 48 false false R49.htm 995875 - Disclosure - Debt - Long-Term Debt (Parenthetical) (Detail) Sheet http://martinmarietta.com/20260331/taxonomy/role/DisclosureDebtLongtermDebtParentheticalDetail Debt - Long-Term Debt (Parenthetical) (Detail) Details 49 false false R50.htm 995885 - Disclosure - Debt - Additional Information (Detail) Sheet http://martinmarietta.com/20260331/taxonomy/role/DisclosureDebtAdditionalInformationDetail Debt - Additional Information (Detail) Details 50 false false R51.htm 995895 - Disclosure - Financial Instruments - Additional Information (Detail) Sheet http://martinmarietta.com/20260331/taxonomy/role/Role_DisclosureFinancialInstrumentsAdditionalInformationDetail Financial Instruments - Additional Information (Detail) Details 51 false false R52.htm 995905 - Disclosure - Income Taxes - Additional Information (Detail) Sheet http://martinmarietta.com/20260331/taxonomy/role/Role_DisclosureIncomeTaxesAdditionalInformationDetail Income Taxes - Additional Information (Detail) Details 52 false false R53.htm 995915 - Disclosure - Pension Benefits - Schedule of Components of Net Periodic Benefit Cost (Detail) Sheet http://martinmarietta.com/20260331/taxonomy/role/DisclosurePensionBenefitsScheduleOfComponentsOfNetPeriodicBenefitCostDetail Pension Benefits - Schedule of Components of Net Periodic Benefit Cost (Detail) Details 53 false false R54.htm 995925 - Disclosure - Commitments and Contingencies - Additional Information (Detail) Sheet http://martinmarietta.com/20260331/taxonomy/role/Role_DisclosureCommitmentsAndContingenciesAdditionalInformationDetail Commitments and Contingencies - Additional Information (Detail) Details 54 false false R55.htm 995935 - Disclosure - Segments - Additional Information (Detail) Sheet http://martinmarietta.com/20260331/taxonomy/role/DisclosureSegmentsAdditionalInformationDetail Segments - Additional Information (Detail) Details 55 false false R56.htm 995945 - Disclosure - Segments - Schedule of Consolidated Earnings from Continuing Operations Before Income Tax Expense (Detail) Sheet http://martinmarietta.com/20260331/taxonomy/role/DisclosureSegmentsScheduleOfConsolidatedEarningsFromContinuingOperationsBeforeIncomeTaxExpenseDetail Segments - Schedule of Consolidated Earnings from Continuing Operations Before Income Tax Expense (Detail) Details 56 false false R57.htm 995955 - Disclosure - Segments - Financial Data for Continuing Operations for Company's Reportable Business Segments (Detail) Sheet http://martinmarietta.com/20260331/taxonomy/role/DisclosureSegmentsFinancialDataForContinuingOperationsForCompanysReportableBusinessSegmentsDetail Segments - Financial Data for Continuing Operations for Company's Reportable Business Segments (Detail) Details 57 false false R58.htm 995965 - Disclosure - Revenues and Gross Profit - Total Revenues and Gross Profit (Loss) by Product Line (Detail) Sheet http://martinmarietta.com/20260331/taxonomy/role/Role_DisclosureRevenuesAndGrossProfitTotalRevenuesAndGrossProfitLossByProductLineDetail Revenues and Gross Profit - Total Revenues and Gross Profit (Loss) by Product Line (Detail) Details 58 false false R59.htm 995975 - Disclosure - Revenues and Gross Profit - Additional Information (Detail) Sheet http://martinmarietta.com/20260331/taxonomy/role/DisclosureRevenuesAndGrossProfitAdditionalInformationDetail2 Revenues and Gross Profit - Additional Information (Detail) Details 59 false false R60.htm 995985 - Disclosure - Revenues and Gross Profit - Additional Information (Detail 1) Sheet http://martinmarietta.com/20260331/taxonomy/role/DisclosureRevenuesAndGrossProfitAdditionalInformationDetail1 Revenues and Gross Profit - Additional Information (Detail 1) Details 60 false false R61.htm 995995 - Disclosure - Supplemental Cash Flow Information - Schedule of Noncash Investing and Financing Activities (Detail) Sheet http://martinmarietta.com/20260331/taxonomy/role/Role_DisclosureSupplementalCashFlowInformationScheduleOfNoncashInvestingAndFinancingActivitiesDetail Supplemental Cash Flow Information - Schedule of Noncash Investing and Financing Activities (Detail) Details 61 false false R62.htm 996005 - Disclosure - Supplemental Cash Flow Information - Additional Information (Detail) Sheet http://martinmarietta.com/20260331/taxonomy/role/DisclosureSupplementalCashFlowInformationAdditionalInformationDetail Supplemental Cash Flow Information - Additional Information (Detail) Details 62 false false R63.htm 996015 - Disclosure - Supplemental Cash Flow Information - Supplemental Disclosures of Cash Flow Information (Detail) Sheet http://martinmarietta.com/20260331/taxonomy/role/Role_DisclosureSupplementalCashFlowInformationSupplementalDisclosuresOfCashFlowInformationDetail Supplemental Cash Flow Information - Supplemental Disclosures of Cash Flow Information (Detail) Details 63 false false R64.htm 996025 - Disclosure - Subsequent Event - Additional Information (Detail) Sheet http://martinmarietta.com/20260331/taxonomy/role/DisclosureSubsequentEventAdditionalInformationDetail Subsequent Event - Additional Information (Detail) Details 64 false false All Reports Book All Reports mlm-20260331.htm mlm-20260331.xsd http://fasb.org/us-gaap/2025 http://xbrl.sec.gov/dei/2025 http://xbrl.sec.gov/ecd/2025 false false