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Revenues And Gross Profit [Text Block] Revenues and Gross Profit Reportable Subsegments [Member] Reportable Subsegments Inventory Valuation Reserves Inventory Valuation Reserves, Beginning Balance Inventory Valuation Reserves, Ending Balance Less: allowances Contract with Customer, Liability Billings in excess of costs Contract with Customer, Liability, Total Amendment Flag Amendment Flag Product and Service [Domain] Product and Service West group. West Group [Member] West Group Inventory Disclosure [Text Block] Inventories, Net Organization, Consolidation, Basis of Presentation, Business Description and Accounting Policies [Text Block] Significant Accounting Policies Earnings Per Share, Policy [Policy Text Block] Earnings per Common Share Current assets held for sale Disposal Group, Including Discontinued Operation, Assets, Current Total current assets held for sale Liabilities and Equity [Abstract] LIABILITIES AND EQUITY Entity Address, Postal Zip Code Entity Address, Postal Zip Code Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Net Cash Provided by Operating Activities Other assets Disposal Group, Including Discontinued Operation, Other Assets, Current Segment Reporting, CODM, Profit (Loss) Measure, How Used, Description Common Stock [Member] Common Stock Inventories Business Combination, Recognized Asset Acquired, Inventory, Current Other assets Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Other Assets Business combination recognized identifiable assets acquired and liabilities assumed other assets. Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Allowances for depreciation, depletion and amortization Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment, Total Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment, Beginning Balance Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment, Ending Balance Other Operating Income (Expense), Net Other operating (income) expense, net Other operating income, net Other operating (income) expense, net Entity Address, Address Line One Entity Address, Address Line One Depreciation, depletion and amortization expense Cost, Depreciation, Amortization and Depletion Cost, Depreciation, Amortization and Depletion, Total Balance at end of period Balance at beginning of period 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 Earnings Per Share [Abstract] Net Earnings Attributable to Martin Marietta Per Common Share: Goodwill and Intangible Assets Disclosure [Text Block] Goodwill Line of Credit Facility, Expiration Period Senior unsecured revolving facility, maturity period Operating Lease, Right-of-Use Asset Operating lease right-of-use assets, net Net Income (Loss) Attributable to Noncontrolling Interest Net Income (Loss) Attributable to Noncontrolling Interest, Total Less: Net earnings attributable to noncontrolling interests Inventory Disclosure [Abstract] Revenues Disposal Group, Including Discontinued Operation, Revenue Document Type Document Type Income Taxes Paid, Net Cash paid for income taxes, net of refunds Income Taxes Paid, Net, Total Gross Profit Gross profit (loss) Gross Profit Gross profit Entity Central Index Key Entity Central Index Key Maximum consolidated debt reduction for unrestricted cash and temporary investments for debt covenant calculation Maximum Consolidated Debt Reduction For Unrestricted Cash And Temporary Investments For Debt Covenant Calculation Maximum consolidated debt reduction for unrestricted cash and temporary investments for debt covenant calculation. Restricted Cash and Cash Equivalent [Abstract] Proceeds from divestitures and sales of assets Proceeds from Sales of Business, Affiliate and Productive Assets Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Net Decrease in Cash and Cash Equivalents Disposal Group Classification [Domain] Disposal Group Classification Common Stock, Par or Stated Value Per Share Common stock, par value Other comprehensive earnings, net of tax Other comprehensive earnings (loss), net of tax Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent Goodwill [Line Items] Building Materials Business [Member] Building Materials Business Building materials business. Building Materials Business Organization policy. Organization Policy [Text Block] Organization Parent [Member] Total Shareholders' Equity Parent Debt Instruments [Abstract] Debt Disclosure [Abstract] Accumulated Foreign Currency Adjustment Attributable to Parent [Member] Foreign Currency Revenue recognition. Revenue Recognition [Line Items] Revenue Recognition [Line Items] Supplemental Cash Flow Elements [Abstract] Reclassification out of Accumulated Other Comprehensive Income [Axis] Reclassification out of Accumulated Other Comprehensive Income Production Capacity of Asset Exchanged Production capacity of asset exchanged. Production capacity of aggregate operations Current Fiscal Year End Date Current Fiscal Year End Date Schedule of Long-Term Debt Instruments [Table] Debt Instrument [Table] Document Quarterly Report Document Quarterly Report CALIFORNIA California Entity Address, State or Province Entity Address, State or Province Other costs of revenues Other Cost of Operating Revenue Business Combination [Table Text Block] Summary of Values of Assets Acquired and Liabilities Assumed Comprehensive Income (Loss), Net of Tax, Attributable to Parent Consolidated comprehensive earnings attributable to Martin Marietta Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements Effect of dilutive employee and director awards Incremental Common Shares Attributable to Share-based Payment Arrangements, Total Geographical Geographical [Axis] Contract with Customer, Liability, Revenue Recognized Revenue recognized from contract liabilities Inventory, Raw Materials, Gross Raw materials Inventory, Raw Materials, Gross, Total Equity, Attributable to Noncontrolling Interest Noncontrolling interests Stockholders' Equity Attributable to Noncontrolling Interest, Total Stockholders' Equity Attributable to Noncontrolling Interest, Beginning Balance Stockholders' Equity Attributable to Noncontrolling Interest, Ending Balance Comprehensive Income, Policy [Policy Text Block] Consolidated Comprehensive Earnings and Accumulated Other Comprehensive Loss Deferred Income Tax Assets, Net Deferred income tax payments Other Postretirement Benefits Plan [Member] Postretirement Benefits Long-Term Debt, Fair Value Long-term debt, fair values Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax Amounts reclassified from accumulated other comprehensive loss, net of tax Earnings from Continuing Operations Amounts reclassified from accumulated other comprehensive loss, net of tax Amounts reclassified from accumulated other comprehensive loss, net of tax 7% Debentures, Due 2025 Seven percent debentures due twenty twenty five. Seven Percent Debentures Due Twenty Twenty Five [Member] Other Assets, Noncurrent Other noncurrent assets Other Assets, Noncurrent, Total Business combination recognized identifiable assets acquired and liabilities assumed asset retirement obligations. Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Asset Retirement Obligations Asset retirement obligations Two point five zero zero percent senior notes due twenty thirty. Two Point Five Zero Zero Percent Senior Notes Due Twenty Thirty [Member] 2.500% Senior Notes, Due 2030 AOCI Attributable to Parent [Member] Accumulated Other Comprehensive Loss Debt instrument maturity date year. Debt Instrument Maturity Date Year Maturity year Schedule of entity wide revenue and gross profit from external customers by products and services. Schedule Of Entity Wide Revenue And Gross Profit From External Customers By Products And Services [Text Block] Total Revenues and Gross Profit (Loss) by Product Line Preferred Stock, Value, Issued Preferred stock, par value $0.01 per share Preferred Stock, Value, Issued, Total Preferred Stock, Value, Issued, Beginning Balance Preferred Stock, Value, Issued, Ending Balance Intangible assets, other than goodwill Business Combination, Recognized Asset Acquired, Identifiable Intangible Asset, Excluding Goodwill Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill, Total Disposal Groups, Including Discontinued Operations [Table Text Block] Summary of Assets and Liabilities Held for Sale Financial instruments disclosure. Financial Instruments Disclosure [Abstract] Selling, general and administrative expenses Selling, General and Administrative Expense Selling, General and Administrative Expense, Total Reclassification out of Accumulated Other Comprehensive Income [Domain] Reclassification out of Accumulated Other Comprehensive Income Minimum [Member] Minimum Assets, Current [Abstract] Current Assets: South Texas cement business and related ready mixed concrete operations. South Texas Cement Business [Member] South Texas Cement Business Segment Reporting [Abstract] Total Assets Business Combination, Recognized Asset Acquired, Asset Liabilities, Current [Abstract] Current Liabilities: Stock Repurchased and Retired During Period, Value Repurchases of common stock Regulatory Asset [Axis] Quikrete [Member] Quikrete Holdings, Inc [Member] Quikrete Holdings, Inc. Business combination number of active aggregate operations acquired. Business Combination Number of Active Aggregate Operations Acquired Number of active aggregates operations Accounts Receivable, after Allowance for Credit Loss, Current Accounts receivable, net Accounts Receivable, after Allowance for Credit Loss, Current, Total Cement Cement [Member] Cement. Noncash asset and portfolio rationalization charge. Noncash Asset And Portfolio Rationalization Charge Noncash asset and portfolio rationalization charge Commitments and contingent liabilities - Note 9 Commitments and Contingencies Defined Benefit Plan, Service Cost Service cost Reclassification out of Accumulated Other Comprehensive Income [Table] Reclassification Out Of Accumulated Other Comprehensive Income [Table] Inventory, Work in Process, Gross Products in process Shares Issued, Shares, Share-Based Payment Arrangement, after Forfeiture Issuances of common stock for stock award plans (in shares) Shares Issued, Shares, Share-based Payment Arrangement, after Forfeiture, Total Reduction in goodwill Goodwill, Measurement Period Adjustment Reduction in goodwill Adjustments to purchase price allocations Debt Instrument, Basis Spread on Variable Rate Basis spread on variable rate Changes in Goodwill Schedule of Goodwill [Table Text Block] Capital Expenditures Incurred but Not yet Paid Accrued liabilities for purchases of property, plant and equipment Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Consolidated net earnings Consolidated net earnings Consolidated net earnings (loss) Disposal Group, Including Discontinued Operation, Liabilities, Current Current liabilities held for sale Total current liabilities held for sale Disposal Group, Including Discontinued Operation, Liabilities, Current, Total Accrued Income Taxes, Current Accrued income taxes Long-Term Debt, Type [Domain] Long-term Debt, Type Operating lease right-of-use assets, held-for-sale. Operating Lease Right-of-Use Assets, Held-for-Sale Operating lease right-of-use assets Weighted Average Number of Shares Outstanding, Basic Basic Basic weighted-average common shares outstanding Weighted Average Number of Shares Outstanding, Basic, Total Segments [Axis] Segments Pretax earnings (loss) Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax Pretax loss Subsequent Events Subsequent Events [Text Block] Long-Term Debt Long-term debt, carrying values Total debt APIC, Share-Based Payment Arrangement, Increase for Cost Recognition Stock-based compensation expense APIC, Share-based Payment Arrangement, Increase for Cost Recognition, Total Variable Rate [Domain] Variable Rate Ending Balance Beginning Balance Equity, Attributable to Parent Total Shareholders' Equity Preferred Stock, Par or Stated Value Per Share Preferred stock, par value Statement of Stockholders' Equity [Abstract] Trade receivable credit facility. Trade Receivable Credit Facility [Member] Trade Receivable Facility Property, plant and equipment Business Combination, Recognized Asset Acquired, Property, Plant, and Equipment Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment, Total Defined Benefit Plan Disclosure [Line Items] Defined Benefit Plan Disclosure [Line Items] Other Operating Income And Expense [Table] Other Operating Income And Expense [Table] Other operating income and expense. Percentage of minimum amount of income tax payments net of refunds received. Percentage of Minimum Amount of Income Tax Payments Net of Refunds Received Percentage of minimum amount of income tax payments net of refunds received Product Information [Line Items] Product Information [Line Items] Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] Pension and Postretirement Benefit Plans Noncontrolling Interest [Member] Noncontrolling Interests Debt Instrument, Name [Domain] Debt Instrument, Name Regulatory Asset [Domain] Other Assets, Current Other current assets Segment Reporting, CODM, Individual Title and Position or Group Name [Extensible Enumeration] Income tax. Income Tax [Table] Income Tax [Table] Interest Expense, Operating and Nonoperating Interest expense Interest Expense, Total Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date Credit Facility [Axis] Credit Facility Cost of revenues Cost of Product and Service Sold Cost of Goods and Services Sold, Total Total cost of revenues Accrued Benefits on Life Insurance Contracts Accrued benefits on life insurance contracts. Accrued benefits on life insurance contracts Excluding acquisition bridge debt. Excluding Acquisition Bridge Debt [Member] Excluding Acquisition Bridge Debt Liabilities: Business Combination, Recognized Liability Assumed, Liability [Abstract] Cement and ready mixed concrete. Cement and Ready Mixed Concrete [Member] Cement and ready mixed concrete Pension Plan [Member] Pension East Group East Group [Member] East group. Entity Address, City or Town Entity Address, City or Town Three point two zero zero percent senior notes, due twenty fifty one. Three Point Two Zero Zero Percent Senior Notes Due Twenty Fifty One [Member] 3.200% Senior Notes, Due 2051 Stock Repurchased During Period, Shares Repurchases of common stock, Shares Number of Reportable Segments Reportable business segments Reportable business segments Security Exchange Name Security Exchange Name Credit Facility [Domain] Credit Facility Property, Plant and Equipment, Gross Property, plant and equipment Property, Plant and Equipment, Gross, Total Property, Plant and Equipment, Gross, Beginning Balance Property, Plant and Equipment, Gross, Ending Balance Counterparty Name [Axis] Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Consolidated earnings from continuing operations before income tax expense Earnings before income tax expense Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent Income/ loss from discontinued operations Loss from discontinued operations, net of income tax benefit Inventory, Net Inventories, net Inventories, net Cash, Cash Equivalents and Restricted Cash, end of period Cash, Cash Equivalents and Restricted Cash, beginning of period Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Total cash, cash equivalents and restricted cash presented in the consolidated statements of cash flows Interest Paid, Excluding Capitalized Interest, Operating Activity Cash paid for interest, net of capitalized amount Statistical Measurement [Domain] Statistical Measurement Other Operating Income and Expense [Text Block] Other Operating (Expense) Income, Net Assets, Current Total Current Assets Document Period End Date Document Period End Date Other Income and Expenses [Abstract] Statement of Financial Position [Abstract] Assets: Business Combination, Recognized Asset Acquired, Asset [Abstract] Magnesia specialties. Magnesia Specialties [Member] Magnesia Specialties Reclassification out of Accumulated Other Comprehensive Income [Member] Reclassification out of Accumulated Other Comprehensive Income Significant accounting policies. Significant Accounting Policies [Line Items] Significant Accounting Policies [Line Items] Liabilities Total Liabilities Asset retirement obligations, held-for-sale. Asset Retirement Obligations, Held-for-Sale Asset retirement obligations Asset retirement obligations External Freight Expense External freight expense. External freight expense Reportable Segments [Member] Reportable Segments [Member] Reportable Segments Noncurrent asset retirement obligations Asset Retirement Obligations, Noncurrent Asset Retirement Obligations, Noncurrent, Total Defined Benefit Plan, Expected Return (Loss) on Plan Assets Expected return on assets Restricted Cash Restricted cash Restricted Cash, Total Disposal Groups, Including Discontinued Operations [Table] Income Statement Balance Sheet And Additional Disclosures By Disposal Groups Including Discontinued Operations [Table] Variable Rate Variable Rate [Axis] Weighted Average Number of Shares Outstanding, Diluted Diluted Diluted weighted-average common shares outstanding Securities Act File Number Entity File Number Payments of Ordinary Dividends, Common Stock Dividends paid Inventories net held-for-sale. Inventories Net, Held-for-Sale Inventories, net Four point two five zero percent senior notes due twenty fourty seven. Four Point Two Five Zero Percent Senior Notes Due Twenty Fourty Seven [Member] 4.250% Senior Notes, Due 2047 Revenue, Performance Obligation, Description of Timing Performance obligations, description of timing Cover [Abstract] Transaction expenses Transaction Expenses Transaction expenses. 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 Debt covenant California and Colorado. California And Colorado [Member] CALIFORNIA and COLORADO Property, plant and equipment, additions through acquisitions. Property Plant And Equipment Additions Through Acquisitions Property additions through business combinations Tax effect Reclassification from AOCI, Current Period, Tax, Total Reclassification from AOCI, Current Period, Tax Depreciation Bonus Percentage Depreciation bonus percentage. Depreciation bonus percentage Number of Operating Segments Number of divisions represent operating segments Segments Segment Reporting Disclosure [Text Block] Segment Reporting, Reconciling Item, Corporate Nonsegment [Member] Corporate Significant accounting policies. Significant Accounting Policies [Table] Significant Accounting Policies [Table] Nature of Operation, Product Information, Concentration of Risk [Table] Schedule Of Product Information [Table] New Accounting Pronouncements, Policy [Policy Text Block] New Accounting Pronouncements Cash Provided by (Used in) Investing Activities, Discontinued Operations, Total Net cash provided by investing activities Cash Provided by (Used in) Investing Activity, Discontinued Operation Net cash used for investing activities (capital expenditures) Comprehensive Income (Loss) [Table Text Block] Consolidated Comprehensive Earnings Total liabilities Total liabilities Business Combination, Recognized Liability Assumed, Liability Revenues Disposal Group, Including Discontinued Operation, Consideration Common Stock, Shares, Outstanding Ending Balance (in shares) Beginning Balance (in shares) Common stock, shares outstanding Current operating lease liabilities Operating Lease, Liability, Current Depreciation, Depletion and Amortization Depreciation, depletion and amortization Depreciation, Depletion and Amortization, Total Revenue, Remaining Performance Obligation, Amount Future revenues from unsatisfied performance obligations Defined Benefit Plan, Amortization of Prior Service Cost (Credit) Amortization of prior service cost Document Transition Report Document Transition Report Payments for Repurchase of Common Stock Repurchases of common stock Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest, Total Consolidated comprehensive earnings Statement of Cash Flows [Abstract] Income taxes. Income Taxes [Line Items] Income Taxes [Line Items] Ready mixed concrete. Ready Mixed Concrete [Member] Ready Mixed Concrete Payments to Acquire Businesses, Net of Cash Acquired Acquisitions, net of cash acquired Payments to Acquire Businesses, Net of Cash Acquired, Total Aggregates. Aggregates [Member] Aggregates Discontinued Operations and Disposal Groups [Abstract] Net Earnings Attributable to Martin Marietta Increase (Decrease) in Inventories Inventories, net Increase (Decrease) in Inventories, Total Other intangibles, net Other Intangible Assets, Net Number of quarries and yards. Number Of Quarries And Yards Number of quarries and yards Other financing activities, net Proceeds from (Payment for) Other Financing Activity Investment land Real Estate, Land, Held-for-Sale Proceeds from divestitures and sales of assets Proceeds from Divestiture of Businesses Assets [Abstract] ASSETS Cash Provided by (Used in) Operating Activity, Discontinued Operation Net cash used for operating activities Energy Expense Energy expense. Energy expense Document Fiscal Year Focus Document Fiscal Year Focus Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Changes in Accumulated Other Comprehensive Loss Net of Tax Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period Performance obligations, customer satisfaction period Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract] Cash Flows from Investing Activities: Retirement Benefits [Abstract] Accounts Payable, Current Accounts payable Accounts Payable, Current, Total Schedule of Net Benefit Costs [Table Text Block] Schedule of Components of Net Periodic Benefit Cost Pretax gain Gain (Loss) on Disposition of Business Gain on sale of investment Proceeds from exchange of certain assets Proceeds from Sale of Productive Assets Proceeds from Sale of Productive Assets, Total Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block] Summary of Information About the Company's Contract Balances Lease obligation, held-for-sale. Lease Obligation, Held-for-Sale Lease obligations Lease obligations Shares Issued, Value, Share-Based Payment Arrangement, after Forfeiture Issuances of common stock for stock award plans Shares Issued, Value, Share-based Payment Arrangement, after Forfeiture, Total Commitments and Contingencies Disclosure [Abstract] Net identifiable assets acquired Business Combination, Recognized Asset Acquired to Liability Assumed, Excess (Less) Net identifiable assets acquired Basis of presentation and use of estimates. Basis Of Presentation And Use Of Estimates Policy [Text Block] Basis of Presentation and Use of Estimates Cash Flow, Supplemental Disclosures [Text Block] Supplemental Cash Flow Information Long-Term Line of Credit Outstanding borrowing under credit facility Long-term Line of Credit, Total Net earnings from continuing operations attributable to Martin Marietta Business Combination, Pro Forma Information, Pro Forma Income (Loss) from Continuing Operations, after Tax Summary of Unaudited Pro Forma Financial Information Business Combination, Pro Forma Information [Table Text Block] Debt Instrument [Axis] Debt Instrument Defined Benefit Plan, Interest Cost Interest cost Cash Provided by (Used in) Investing Activity, Including Discontinued Operation Net Cash Used for Investing Activities Title of 12(b) Security Title of 12(b) Security Schedule of Segment Reporting Information, by Segment [Table] Schedule Of Segment Reporting Information By Segment [Table] Investment Program, Proportional Amortization Method, Elected, Other Income Tax Benefit Investment program, proportional amortization method, other income tax benefit Income Tax Disclosure [Text Block] Income Taxes 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 Tax effect of other comprehensive earnings Other Liabilities, Noncurrent Other noncurrent liabilities Other Liabilities, Noncurrent, Total Construction Contractor, Receivable, Retainage Retainage on contracts Construction Contractor, Receivable, Retainage, Total Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Increase (Decrease) in Operating Capital [Abstract] Changes in operating assets and liabilities, net of effects of acquisitions and divestitures: Letters of Credit Outstanding, Amount Outstanding letters of credit Schedule of Other Significant Noncash Transactions [Table Text Block] Schedule of Noncash Investing and Financing Activities Investment Program, Proportional Amortization Method, Elected, Commitment Investment program, commitment amount Income Tax Disclosure [Abstract] Additional Paid-in Capital [Member] Additional Paid-in Capital West Group Building materials business west group. Building Materials Business West Group [Member] West Group East Group Building materials business east group. Building Materials Business East Group [Member] Statement of Income Location, Balance [Axis] Income Statement Location Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] Trading Symbol Trading Symbol Two point four zero zero percent senior notes, due twenty thirty one. Two Point Four Zero Zero Percent Senior Notes Due Twenty Thirty One [Member] 2.400% Senior Notes, Due 2031 Disposal Group, Held-for-Sale, Not Discontinued Operations [Member] Continuing Operations Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax Pretax loss on divestitures and sales of assets Accrued salaries, benefits and payroll taxes Employee-related Liabilities, Current Employee-related Liabilities, Current, Total Remeasurement of operating leases right of use assets. Remeasurement Of Operating Leases Right Of Use Assets Remeasurement of operating lease right-of-use assets Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract] Cash Flows from Financing Activities: Equity Components [Axis] Equity Components Asphalt and paving services. Asphalt and Paving Services [Member] Asphalt and paving services Equity Component Equity Component [Domain] Performance obligation period. Performance Obligation Period Performance obligations, period RETC Projects Renewable Energy Program [Member] Goodwill and Intangible Assets Disclosure [Abstract] Business Combination [Axis] Business Acquisition Intersubsegment Eliminations [Member] Interproduct Revenues Statement of Comprehensive Income [Abstract] Maximum [Member] Maximum Maximum Statistical Measurement [Axis] Statistical Measurement Common Stock, Value, Issued Common Stock, Value, Issued, Total Common Stock, Value, Issued, Beginning Balance Common Stock, Value, Issued, Ending Balance Common stock, par value $0.01 per share (60,305,739 shares and 61,126,646 shares outstanding at June 30, 2025 and December 31, 2024, respectively) Number of states in which entity operates Number of States in which Entity Operates Finance Lease, Principal Payments Payments on finance lease obligations Line of Credit Facility, Expiration Date Debt instrument maturity period Revenues and gross profit. Revenues And Gross Profit [Abstract] Reclassification out of Accumulated Other Comprehensive Income [Table Text Block] Reclassification Out of Accumulated Other Comprehensive Loss Ending Balance Beginning Balance Equity, Including Portion Attributable to Noncontrolling Interest Total Equity Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] Consolidated Comprehensive Earnings: Interest Payable, Current Accrued interest Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest, Total Comprehensive earnings attributable to noncontrolling interests Mergers, Acquisitions and Dispositions Disclosures [Text Block] Business Combinations and Divestitures Payment, Tax Withholding, Share-Based Payment Arrangement Shares withheld for employees' income tax obligations Revenue from Contract with Customer [Text Block] Revenue Recognition Business Combination [Table] Schedule Of Business Acquisitions By Acquisition [Table] Entity Registrant Name Entity Registrant Name Debt Disclosure [Text Block] Debt Six point two five percentage of senior notes due two thousand thirty seven. Six Point Two Five Percentage Of Senior Notes Due Two Thousand Thirty Seven [Member] 6.25% Senior Notes, Due 2037 Zero point six five zero percent senior notes, due twenty twenty three. Zero Point Six Five Zero Percent Senior Notes Due Twenty Twenty Three [Member] 0.650% Senior Notes, Due 2023 (discharged) Accrued other taxes current. Accrued Other Taxes Current Accrued other taxes Other Nonoperating Income (Expense) Other nonoperating income, net Other Nonoperating Income (Expense), Total Noncash asset and portfolio rationalization charge Accumulated Other Comprehensive Income (Loss) [Table] Accumulated Other Comprehensive Income Loss [Table] Subsequent Events [Abstract] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] Tax effect Income Tax Expense (Benefit) Income tax expense Income Tax Expense (Benefit), Total Business combination acquisition divestiture and integration related costs. Business Combination Acquisition Divestiture And Integration Related Costs Acquisition, divestiture and integration expenses Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Disposal Group Classification [Axis] Disposal Group Classification Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, before Tax Amortization of prior service cost Amortization of prior service cost Business Combination, periods for production level Business Combination, periods for production level Business combination periods for production level Accumulated Other Comprehensive Income (Loss), Net of Tax Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax, Total Consolidation Items [Axis] Consolidation Items Payments to Acquire Property, Plant, and Equipment Additions to property, plant and equipment Payments to Acquire Property, Plant, and Equipment, Total Payment for (Proceeds from) Other Investing Activity Other investing activities, net Assets employed Assets Total Assets Income Statement [Abstract] Amortization of actuarial loss Defined Benefit Plan, Amortization of Gain (Loss) Remeasurement of finance lease right-of-use assets. Remeasurement Of Finance Lease Right Of Use Assets Remeasurement of finance lease right-of-use assets Deferred Income Tax Expense (Benefit) Deferred income taxes, net Deferred Income Tax Expense (Benefit), Total Subsegments Consolidation Items [Axis] Subsegments Consolidation Items Business Combination [Abstract] Earnings Per Share, Diluted Earnings Per Share, Diluted, Total Diluted attributable to common shareholders Schedule of Segment Reporting Information, by Segment [Table Text Block] Financial Data for Continuing Operation for Company's Reportable Business Segments Operating Segments [Member] Operating Segments Increase (Decrease) in Accounts Payable, Trade Accounts payable Business combination recognized identifiable assets acquired and liabilities assumed mineral reserves. Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Mineral Reserves Mineral reserves City Area Code City Area Code Investment program, proportional amortization method, income tax credit Investment Program, Proportional Amortization Method, Elected, Income Tax Credit Revenues Business Combination, Pro Forma Information, Pro Forma Revenue Other Comprehensive Income (Loss), Net of Tax Other Comprehensive Income (Loss), Net of Tax, Total Other comprehensive earnings, net of tax Income tax expense Discontinued Operation, Tax Effect of Discontinued Operation Discontinued Operation, Tax Effect of Discontinued Operation, Total Income tax benefit Line of Credit Facility, Maximum Borrowing Capacity Credit facility commitment Business Combination [Line Items] Business Acquisition [Line Items] Defined Benefit Plan [Table] Schedule Of Defined Benefit Plans Disclosures [Table] Counterparty Name [Domain] 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 Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Business Combinations and Divestitures Text Block Business combinations and divestitures. Business Combinations and Divestitures Property, Plant and Equipment, Net Net property, plant and equipment Property, Plant and Equipment, Net, Beginning Balance Property, Plant and Equipment, Net, Ending Balance Right-of-Use Asset Obtained in Exchange for Finance Lease Liability Right-of-use assets obtained in exchange for new finance lease liabilities Pretax earnings Operating Income (Loss) Earnings from Operations Segment Earnings (Loss) from Operations Retained Earnings [Member] Retained Earnings Share-Based Payment Arrangement, Noncash Expense Stock-based compensation expense Share-based Payment Arrangement, Noncash Expense, Total Operating Lease, Liability, Noncurrent Noncurrent operating lease liabilities Net Cash Used for Financing Activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation Five Point One Five Zero Percent Senior Notes Due Twenty Thirty Four [Member] Five point one five zero percent senior notes, due twenty thirty four. 5.150% Senior Notes, Due 2034 Deferred Income Tax Liabilities, Net Deferred income taxes, net Deferred Income Tax Liabilities, Net, Total Goodwill [Table] 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] Entity Interactive Data Current Entity Interactive Data Current Statement of Income Location, Balance [Domain] Income Statement Location Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract] Cash Flows from Operating Activities: Raw materials expense Raw Materials Expense Raw materials expense. Contract with Customer, Asset, after Allowance for Credit Loss Costs in excess of billings Contract with Customer, Asset, after Allowance for Credit Loss, Total Common Stock, Dividends, Per Share, Declared Dividends declared Deferred income tax payments Deferred Federal, State and Local, Tax Expense (Benefit) Deferred Federal, State and Local, Tax Expense (Benefit), Total Line of credit, trade receivable securitization facility Line of Credit Facility, Current Borrowing Capacity Entity Tax Identification Number Entity Tax Identification Number Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] Equity: Long-Term Debt, Type [Axis] Long-term Debt, Type Other Inventory, Supplies, Gross Supplies and expendable parts Local Phone Number Local Phone Number Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income (Loss) [Line Items] Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Net periodic benefit cost (credit) Other Liabilities, Current Other current liabilities Other Liabilities, Current, Total Weighted Average Number of Shares Outstanding, Diluted [Abstract] Weighted-Average Common Shares Outstanding: Accounting Policies [Abstract] Other Comprehensive Income (Loss), before Reclassifications, Net of Tax Other comprehensive loss, before reclassifications, net of tax Other comprehensive earnings (loss) before reclassifications, net of tax Revenues Revenue from Contract with Customer, Excluding Assessed Tax, Total Service revenues Segment Revenues Blue Water Industries LLC Blue Water Industries LLC [Member] Blue Water Industries LLC. Labor and Related Expense Labor and benefits expense Entity Emerging Growth Company Entity Emerging Growth Company Subsegments Consolidation Items [Domain] Subsegments Consolidation Items Business Combination, Recognized Asset Acquired to Liability Assumed, Excess (Less), and Goodwill Total consideration Chair, President And Chief Executive Officer. Chair, President And Chief Executive Officer [Member]