Entity Central Index Key Document And Company Information. Document And Entity Information [Abstract] Document Type Document Type Amendment Flag Amendment Flag Document Period End Date Document Period End Date Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Trading Symbol Trading Symbol Entity Registrant Name Entity Registrant Name Entity Central Index Key Current Fiscal Year End Date Current Fiscal Year End Date Entity Filer Category Entity Filer Category Entity Common Stock, Shares Outstanding Entity Common Stock Shares Outstanding Intangible assets operating permits net. Statement Of Financial Position [Abstract] ASSETS Assets [Abstract] Current Assets: Assets Current [Abstract] Cash and cash equivalents Cash And Cash Equivalents At Carrying Value Accounts receivable, net Accounts And Other Receivables Net Current Inventories, net Inventory Net Other current assets Other Assets Current Total Current Assets Assets Current Property, plant and equipment Property Plant And Equipment Gross Allowances for depreciation, depletion and amortization Accumulated Depreciation Depletion And Amortization Property Plant And Equipment Net property, plant and equipment Property Plant And Equipment Net Goodwill Goodwill Operating permits, net Intangible Assets Operating Permits Net Other intangibles, net Other Intangible Assets Net Other noncurrent assets Other Assets Noncurrent Total Assets Assets LIABILITIES AND EQUITY Liabilities And Stockholders Equity [Abstract] Current Liabilities: Liabilities Current [Abstract] Bank overdraft Bank Overdrafts Accounts payable Accounts Payable Current Accrued salaries, benefits and payroll taxes Employee Related Liabilities Current Pension and postretirement benefits Pension And Other Postretirement And Postemployment Benefit Plans Liabilities Current Accrued insurance and other taxes Accrual For Taxes Other Than Income Taxes Current Current maturities of long-term debt and short-term facilities Long Term Debt Current Accrued interest Interest Payable Current Other current liabilities Other Liabilities Current Total Current Liabilities Liabilities Current Long-term debt Long Term Debt Noncurrent Pension, postretirement and postemployment benefits Pension And Other Postretirement And Postemployment Benefit Plans Liabilities Noncurrent Deferred income taxes, net Deferred Tax Liabilities Noncurrent Other noncurrent liabilities Other Liabilities Noncurrent Total Liabilities Liabilities Equity: Stockholders Equity Including Portion Attributable To Noncontrolling Interest [Abstract] Common stock, par value $0.01 per share Common Stock Value Preferred stock, par value $0.01 per share Preferred Stock Value Additional paid-in capital Additional Paid In Capital Common Stock Accumulated other comprehensive loss Accumulated Other Comprehensive Income Loss Net Of Tax Retained earnings Retained Earnings Accumulated Deficit Total Shareholders' Equity Stockholders Equity Noncontrolling interests Minority Interest Total Equity Stockholders Equity Including Portion Attributable To Noncontrolling Interest Total Liabilities and Equity Liabilities And Stockholders Equity Common stock, par value Common Stock Par Or Stated Value Per Share Preferred stock, par value Preferred Stock Par Or Stated Value Per Share Income Statement [Abstract] Net Sales Sales Revenue Goods Net Freight and delivery revenues Shipping And Handling Revenue Total revenues Sales Revenue Net Cost of sales Cost Of Goods Sold Freight and delivery costs Shipping Handling And Transportation Costs Total cost of revenues Cost Of Goods And Services Sold Gross Profit Gross Profit Selling, general & administrative expenses Selling General And Administrative Expense Acquisition-related expenses, net Business Combination Acquisition Related Costs Other operating expense (income), net Other Operating Income Expense Net Earnings from Operations Operating Income Loss Interest expense Interest Expense Other nonoperating income, net Other Nonoperating Income Expense Earnings before taxes on income Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest Taxes on income Income Tax Expense Benefit Consolidated net earnings Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest Less: Net (loss) earnings attributable to noncontrolling interests Net Income Loss Attributable To Noncontrolling Interest Net Earnings Attributable to Martin Marietta Materials, Inc. Net Income Loss Consolidated Comprehensive Earnings: (See Note 1) Comprehensive Income Net Of Tax [Abstract] Earnings attributable to Martin Marietta Materials, Inc. Comprehensive Income Net Of Tax Earnings (Loss) attributable to noncontrolling interests Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest Net Earnings Attributable to Martin Marietta Materials, Inc. Per Common Share: Earnings Per Share [Abstract] Basic attributable to common shareholders Earnings Per Share Basic Diluted attributable to common shareholders Earnings Per Share Diluted Weighted-Average Common Shares Outstanding: Weighted Average Number Of Shares Outstanding [Abstract] Basic Weighted Average Number Of Shares Outstanding Basic Diluted Weighted Average Number Of Diluted Shares Outstanding Cash Dividends Per Common Share Common Stock Dividends Per Share Cash Paid Statement Of Cash Flows [Abstract] Cash Flows from Operating Activities: Net Cash Provided By Used In Operating Activities [Abstract] Consolidated net earnings 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] Depreciation, depletion and amortization Depreciation Depletion And Amortization Stock-based compensation expense Share Based Compensation (Gain) Loss on divestitures and sales of assets Gain Loss On Disposition Of Assets Deferred income taxes Deferred Income Tax Expense Benefit Other items, net Other Noncash Income Expense Changes in operating assets and liabilities, net of effects of acquisitions and divestitures: Increase Decrease In Operating Capital [Abstract] Accounts receivable, net Increase Decrease In Accounts Receivable Inventories, net Increase Decrease In Inventories Accounts payable Increase Decrease In Accounts Payable Trade Other assets and liabilities, net Increase Decrease In Other Operating Capital Net Net Cash Provided by Operating Activities Net Cash Provided By Used In Operating Activities Cash Flows from Investing Activities: Net Cash Provided By Used In Investing Activities [Abstract] Additions to property, plant and equipment Payments To Acquire Property Plant And Equipment Acquisitions, net Payments To Acquire Businesses Net Of Cash Acquired Cash received in acquisition Cash Acquired From Acquisition Proceeds from divestitures and sales of assets Proceeds From Sales Of Business Affiliate And Productive Assets Payment of railcar construction advances Repayments Of Advances For Construction Reimbursement of railcar construction advances Proceeds From Advances For Construction Net Cash Used for Investing Activities Net Cash Provided By Used In Investing Activities Cash Flows from Financing Activities: Net Cash Provided By Used In Financing Activities [Abstract] Borrowings of debt Proceeds From Issuance Of Debt Repayments of debt Repayments Of Debt Payments on capital lease obligations Repayments Of Long Term Capital Lease Obligations Debt issuance costs Payments Of Debt Issuance Costs Change in bank overdraft Proceeds From Repayments Of Bank Overdrafts Contributions by owners of noncontrolling interest Proceeds From Minority Shareholders Dividends paid Payments Of Dividends Common Stock Proceeds from exercise of stock options Proceeds From Stock Options Exercised Shares withheld for employees' income tax obligations Payments Related To Tax Withholding For Share Based Compensation Repurchases of common stock Payments For Repurchase Of Common Stock Net Cash Used for Financing Activities Net Cash Provided By Used In Financing Activities Net Decrease in Cash and Cash Equivalents Cash And Cash Equivalents Period Increase Decrease Cash and Cash Equivalents, beginning of period Cash and Cash Equivalents, end of period Statement Of Stockholders Equity [Abstract] Statement [Table] Statement [Table] Equity Components Statement Equity Components [Axis] Equity Component Equity Component [Domain] Common Stock Common Stock [Member] Additional Paid-in Capital Additional Paid In Capital [Member] Accumulated Other Comprehensive Loss Accumulated Other Comprehensive Income [Member] Retained Earnings Retained Earnings [Member] Total Shareholders' Equity Parent [Member] Noncontrolling Interests Noncontrolling Interest [Member] Statement [Line Items] Statement [Line Items] Beginning Balance Beginning Balance (in shares) Common Stock Shares Outstanding Consolidated net earnings (loss) Other comprehensive earnings, net of tax Other Comprehensive Income Loss Net Of Tax Dividends declared Dividends Common Stock Cash Issuances of common stock for stock award plans Stock Issued During Period Value Share Based Compensation Issuances of common stock for stock award plans (in shares) Stock Issued During Period Shares Share Based Compensation Repurchases of common stock Stock Repurchased During Period Value Repurchases of common stock, Shares Stock Repurchased During Period Shares Stock-based compensation expense Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value Contributions by owners of noncontrolling interest Noncontrolling Interest Increase From Subsidiary Equity Issuance Ending Balance Ending Balance (in shares) Accounting Policies [Abstract] Significant Accounting Policies Organization Consolidation Basis Of Presentation Business Description And Accounting Policies [Text Block] Goodwill And Intangible Assets Disclosure [Abstract] Goodwill Goodwill Disclosure [Text Block] Inventory Disclosure [Abstract] Inventories, Net Inventory Disclosure [Text Block] Debt Disclosure [Abstract] Long-Term Debt Debt Disclosure [Text Block] Financial instruments disclosure. Financial Instruments Disclosure [Abstract] Financial Instruments Financial Instruments Disclosure [Text Block] Income Tax Disclosure [Abstract] Income Taxes Income Tax Disclosure [Text Block] Compensation And Retirement Disclosure [Abstract] Pension and Postretirement Benefits Pension And Other Postretirement Benefits Disclosure [Text Block] Commitments And Contingencies Disclosure [Abstract] Commitments and Contingencies Commitments And Contingencies Disclosure [Text Block] Segment Reporting [Abstract] Business Segments Segment Reporting Disclosure [Text Block] Other Income And Expenses [Abstract] Other Operating Expense (Income), Net Other Operating Income And Expense [Text Block] Supplemental Cash Flow Elements [Abstract] Supplemental Cash Flow Information Cash Flow Supplemental Disclosures [Text Block] Business Combinations [Abstract] Business Combinations Business Combination Disclosure [Text Block] Pending acquisition. Pending Acquisition of Bluegrass Materials Pending Acquisition [Text Block] Organization policy. Organization Organization Policy [Text Block] Basis of Presentation Basis Of Accounting Policy Policy [Text Block] New Accounting Pronouncements New Accounting Pronouncements Policy Policy [Text Block] Pending accounting pronouncements. Pending Accounting Pronouncements Pending Accounting Pronouncements Policy Policy [Text Block] Reclassifications Prior Period Reclassification Adjustment Description Consolidated Comprehensive Earnings/Loss and Accumulated Other Comprehensive Loss Comprehensive Income Policy Policy [Text Block] Earnings per Common Share Earnings Per Share Policy [Text Block] Significant accounting policies. Significant accounting policies. Significant Accounting Policies [Table] Significant Accounting Policies [Table] Parent Significant Accounting Policies [Line Items] Significant Accounting Policies [Line Items] Comprehensive Earnings Schedule Of Comprehensive Income Loss Table [Text Block] Changes in Accumulated Other Comprehensive Earnings (Loss), Net of Tax Schedule Of Accumulated Other Comprehensive Income Loss Table [Text Block] Noncurrent deferred tax assets recorded in accumulated other comprehensive loss. Noncurrent Deferred Tax Assets Recorded In Accumulated Other Comprehensive Loss Noncurrent Deferred Tax Assets Recorded In Accumulated Other Comprehensive Loss Table [Text Block] Reclassification Out of Accumulated Other Comprehensive Loss Reclassification Out Of Accumulated Other Comprehensive Income Table [Text Block] Basic and Diluted Earnings Per Common Share Schedule Of Earnings Per Share Basic And Diluted Table [Text Block] Changes in Goodwill Schedule Of Goodwill [Text Block] Schedule of Inventories Net Schedule Of Inventory Current Table [Text Block] Long-Term Debt Schedule Of Debt Instruments [Text Block] Schedule of Components of Net Periodic Benefit Cost (Credit) Schedule Of Net Benefit Costs Table [Text Block] Financial Data for Continuing Operation For Company's Reportable Business Segments Schedule Of Segment Reporting Information By Segment [Text Block] Net Sales and Gross Profit by Line of Business Schedule Of Entity Wide Information Revenue From External Customers By Products And Services [Text Block] Components of Change in Other Assets and Liabilities, Net Cash Flow Operating Capital Table [Text Block] Schedule Of Noncash Investing and Financing Activities Schedule Of Other Significant Noncash Transactions [Text Block] Supplemental Disclosures of Cash Flow Information Schedule Of Cash Flow Supplemental Disclosures Table [Text Block] Number of quarries distribution facilities and plants. Number of states with aggregates business sales by destination. Range Range [Axis] Range Range [Member] Minimum Minimum [Member] Maximum Maximum [Member] Adjustments for New Accounting Pronouncements Adjustments For New Accounting Pronouncements [Axis] Type of Adoption Type Of Adoption [Member] ASU 2016-09 Accounting Standards Update201609 [Member] Accounting standards update 201707. ASU 2017-07 Accounting Standards Update201707 [Member] Income Statement Location Income Statement Location [Axis] Income Statement Location Income Statement Location [Domain] Cost of Sales Cost Of Sales [Member] Selling, General and Administrative Expenses Selling General And Administrative Expenses [Member] Other Operating Income and Expenses Other Operating Income Expense [Member] Number of quarries distribution facilities and plants Number Of Quarries Distribution Facilities And Plants Number of states with aggregates business sales by destination Number Of States With Aggregates Business Sales By Destination Number of reportable segments Number Of Reportable Segments Shares withheld for income tax obligations reclassified from operating activity to financing activity Excess tax benefits from stock-based compensation recognized as operating activities Excess Tax Benefit From Share Based Compensation Operating Activities Reclassification of costs to nonoperating expense Prior Period Reclassification Adjustment Statement Of Income And Comprehensive Income [Abstract] Net earnings attributable to Martin Marietta Materials, Inc. Other comprehensive earnings, net of tax Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent Net (loss) earnings attributable to noncontrolling interests Other comprehensive earnings, net of tax Other Comprehensive Income Loss Net Of Tax Portion Attributable To Noncontrolling Interest Comprehensive earnings (loss) attributable to noncontrolling interests Accumulated Other Comprehensive Income Loss [Table] Accumulated Other Comprehensive Income Loss [Table] Pension and Postretirement Benefit Plans Accumulated Defined Benefit Plans Adjustment [Member] Foreign Currency Accumulated Translation Adjustment [Member] Unamortized Value of Terminated Forward Starting Interest Rate Swap Accumulated Net Gain Loss From Designated Or Qualifying Cash Flow Hedges [Member] Accumulated Other Comprehensive Income (Loss) [Line Items] Accumulated Other Comprehensive Income Loss [Line Items] Other comprehensive earnings (loss) before reclassifications, net of tax Other Comprehensive Income Loss Before Reclassifications Net Of Tax Amounts reclassified from accumulated other comprehensive earnings, net of tax Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax Other comprehensive earnings (loss), net of tax 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, pension and postretirement benefit plans. Equity [Abstract] Balance at beginning of period, Pension and Postretirement Benefit Plans Accumulated Other Comprehensive Loss Noncurrent Deferred Tax Assets Pension And Postretirement Benefit Plans Tax effect of other comprehensive earnings, Pension and Postretirement Benefit Plans Accumulated Other Comprehensive Loss Noncurrent Deferred Tax Assets Other Comprehensive Earnings Tax Effect Pension And Postretirement Benefit Plans Balance at end of period, Pension and Postretirement Benefit Plans Accumulated other comprehensive loss, noncurrent deferred tax assets, other comprehensive earnings, tax effect, unamortized value of terminated forward starting interest rate swap. Accumulated other comprehensive loss, noncurrent deferred tax assets, unamortized value of terminated forward starting interest rate swap. Balance at beginning of period, Unamortized Value of Terminated Forward Starting Interest Rate Swap Accumulated Other Comprehensive Loss Noncurrent Deferred Tax Assets Unamortized Value Of Terminated Forward Starting Interest Rate Swap Tax effect of other comprehensive earnings, Unamortized Value of Terminated Forward Starting Interest Rate Swap Accumulated Other Comprehensive Loss Noncurrent Deferred Tax Assets Other Comprehensive Earnings Tax Effect Unamortized Value Of Terminated Forward Starting Interest Rate Swap Balance at end of period, Unamortized Value of Terminated Forward Starting Interest Rate Swap Accumulated other comprehensive loss noncurrent deferred tax assets other comprehensive earnings tax effect period increase decrease. Accumulated other comprehensive loss noncurrent deferred tax assets net. Balance at beginning of period, Net Noncurrent Deferred Tax Assets Accumulated Other Comprehensive Loss Noncurrent Deferred Tax Assets Net Tax effect of other comprehensive earnings, Net Noncurrent Deferred Tax Assets Accumulated Other Comprehensive Loss Noncurrent Deferred Tax Assets Other Comprehensive Earnings Tax Effect Period Increase Decrease Balance at end of period, Net Noncurrent Deferred Tax Assets Reclassification Out Of Accumulated Other Comprehensive Income [Table] Reclassification Out Of Accumulated Other Comprehensive Income [Table] Reclassification out of Accumulated Other Comprehensive Income Reclassification Out Of Accumulated Other Comprehensive Income [Axis] Reclassification out of Accumulated Other Comprehensive Income Reclassification Out Of Accumulated Other Comprehensive Income [Domain] Reclassification out of Accumulated Other Comprehensive Income Reclassification Out Of Accumulated Other Comprehensive Income [Member] Other Nonoperating Income, Net Other Nonoperating Income Expense [Member] Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] Settlement charge Other Comprehensive Income Loss Reclassification Adjustment From A O C I Pension And Other Postretirement Benefit Plans For Net Transition Asset Obligation Before Tax Prior service credit Other Comprehensive Income Loss Amortization Adjustment From A O C I Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Before Tax Actuarial loss Other Comprehensive Income Loss Reclassification Adjustment From A O C I Pension And Other Postretirement Benefit Plans For Net Gain Loss Before Tax Total reclassifications out of accumulated other comprehensive loss before taxes Other Comprehensive Income Loss Reclassification Adjustment From A O C I Pension And Other Postretirement Benefit Plans Before Tax Additional interest expense Tax benefit Earnings from Continuing Operations Basic and diluted net income loss attributable to common shareholders of reporting entity. Net earnings attributable to Martin Marietta Materials, Inc. Income Loss From Continuing Operations Less: Distributed and undistributed earnings attributable to unvested awards Participating Securities Distributed And Undistributed Earnings Loss Diluted Basic and diluted net earnings available to common shareholders attributable to Martin Marietta Materials, Inc. Basic And Diluted Net Income Loss Attributable To Common Shareholders Of Reporting Entity Basic weighted-average common shares outstanding Effect of dilutive employee and director awards Incremental Common Shares Attributable To Share Based Payment Arrangements Diluted weighted-average common shares outstanding Schedule Of Goodwill [Table] Schedule Of Goodwill [Table] Segments Statement Business Segments [Axis] Segments Segment [Domain] Mid America Group. Mid-America Group Mid America Group [Member] Southeast group. Southeast Group Southeast Group [Member] West group. West Group West Group [Member] Goodwill [Line Items] Goodwill [Line Items] Balance at beginning of period Adjustments to purchase price allocations Goodwill Purchase Accounting Adjustments Balance at end of period Finished products Inventory Finished Goods Products in process and raw materials Inventory Work In Process And Raw Materials Supplies and expendable parts Other Inventory Supplies Inventories, Gross Inventory Gross Less: Allowances Inventory Valuation Reserves Total Debt Instrument [Table] Debt Instrument [Table] Debt Instrument Debt Instrument [Axis] Debt Instrument, Name Debt Instrument Name [Domain] Six point six zero percentage of senior notes due two thousand eighteen. 6.60% Senior Notes, Due 2018 Six Point Six Zero Percentage Of Senior Notes Due Two Thousand Eighteen [Member] Seven percent debentures due twenty twenty five. 7% Debentures, Due 2025 Seven Percent Debentures Due Twenty Twenty Five [Member] Six point two five percent senior notes due twenty thirty seven. 6.25% Senior Notes, Due 2037 Six Point Two Five Percent Senior Notes Due Twenty Thirty Seven [Member] Four point two five percent senior notes due twenty twenty four. 4.25% Senior Notes, Due 2024 Four Point Two Five Percent Senior Notes Due Twenty Twenty Four [Member] Three point four five zero percent senior notes due twenty twenty seven. 3.450% Senior Notes, Due 2027 Three Point Four Five Zero Percent Senior Notes Due Twenty Twenty Seven [Member] Floating rate senior notes due twenty seventeen. Floating Rate Notes, Due 2017 Floating Rate Senior Notes Due Twenty Seventeen [Member] Floating rate senior notes due twenty twenty. Floating Rate Notes, Due 2020 Floating Rate Senior Notes Due Twenty Twenty [Member] Term loan facility due twenty eighteen. Term Loan Facility, Due 2018 Term Loan Facility Due Twenty Eighteen [Member] Trade receivable credit facility. Trade Receivable Facility Trade Receivable Credit Facility [Member] Other notes. Other Notes Other Notes [Member] Credit Facility Credit Facility [Axis] Credit Facility Credit Facility [Domain] Revolving facility due twenty twenty one. Revolving Facility, Due 2021 Revolving Facility Due Twenty Twenty One [Member] Debt Instrument [Line Items] Debt Instrument [Line Items] Total debt Long Term Debt Less: Current maturities of long-term debt and short-term facilities Debt instrument maturity date year. Maturity year Debt Instrument Maturity Date Year Interest rate on notes Debt Instrument Interest Rate Stated Percentage Interest rate Debt Instrument Interest Rate Effective Percentage Credit Facility interest rate Line Of Credit Facility Interest Rate At Period End Debt Instrument, Redemption, Period Debt Instrument Redemption Period [Axis] Debt Instrument, Redemption, Period Debt Instrument Redemption Period [Domain] Debt Instrument, Redemption, Period One Debt Instrument Redemption Period One [Member] Debt Instrument, Redemption, Period Two Debt Instrument Redemption Period Two [Member] Variable Rate Variable Rate [Axis] Variable Rate Variable Rate [Domain] Three months London Interbank Offered Rate. Three-month LIBOR Three Months London Interbank Offered Rate [Member] Three point four five percent senior notes due twenty twenty seven. 3.45% Senior Notes, Due 2027 Three Point Four Five Percent Senior Notes Due Twenty Twenty Seven [Member] London Interbank Offered Rate(LIBOR) London Interbank Offered Rate L I B O R [Member] Revolving Facility Revolving Credit Facility [Member] Long-term Debt, Type Longterm Debt Type [Axis] Long-term Debt, Type Longterm Debt Type [Domain] Including acquisition bridge debt. Including Acquisition Bridge Debt Including Acquisition Bridge Debt [Member] Excluding acquisition bridge debt. Excluding Acquisition Bridge Debt Excluding Acquisition Bridge Debt [Member] Maximum Six point six five percent senior notes due twenty eighteen. 6.65% Senior Notes, Due 2018 Six Point Six Five Percent Senior Notes Due Twenty Eighteen [Member] Scenario Statement Scenario [Axis] Scenario, Unspecified Scenario Unspecified [Domain] Scenario, Forecast Scenario Forecast [Member] Senior notes, principal amount Debt Instrument Face Amount Debt instrument, redemption description Debt Instrument Redemption Description Debt instrument, maturity date Debt Instrument Maturity Date Redemption price percentage of principal amount of notes redeemed Debt Instrument Redemption Price Percentage Of Principal Amount Redeemed Basis spread on variable rate Debt Instrument Basis Spread On Variable Rate1 Required offer price to repurchase senior notes if change of control repurchase event Debt Instrument Redemption Price Percentage Line of credit facility borrowing base. Credit facility commitment Line Of Credit Facility Maximum Borrowing Capacity Debt instrument maturity period Line Of Credit Facility Expiration Date1 Credit facility borrowing base Line Of Credit Facility Borrowing Base Maximum consolidated debt reduction for unrestricted cash and cash equivalents for debt covenant calculation. The amount by which consolidated debt, for purposes of calculating the debt covenant ratio, may be reduced for unrestricted cash and cash equivalents, provided no amounts are outstanding under the revolving credit facility and the AR credit facility. Ratio of consolidated debt to earnings before interest taxes depreciation depletion and amortization. Senior unsecured revolving facility, maturity period Line Of Credit Facility Expiration Period Debt covenant Ratio Of Consolidated Debt To Earnings Before Interest Taxes Depreciation Depletion And Amortization 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 Reduction of consolidated debt in the debt ratio calculation Consolidated Debt Reduction For Unrestricted Cash And Cash Equivalents For Debt Covenant Calculation Outstanding letters of credit Letters Of Credit Outstanding Amount Debt instrument maturity, description Debt Instrument Maturity Date Description Increase in interest expense due to ongoing amortization of terminated value of swap agreements. Additional interest expense Interest Rate Cash Flow Hedge Gain Loss Reclassified To Earnings Net Increase in interest expense due to ongoing amortization of the terminated value of the swap agreements Increase In Interest Expense Due To Ongoing Amortization Of Terminated Value Of Swap Agreements Fair Value Disclosures [Abstract] Long-term debt, carrying values Long-term debt, fair values Long Term Debt Fair Value Favorable basis points on tax rate related to vesting and exercise of stock-based compensation awards. Income taxes. Income tax. Income Tax [Table] Income Tax [Table] Adoption of ASU 2016-09 Income Taxes [Line Items] Income Taxes [Line Items] Effective income tax rate Effective Income Tax Rate Continuing Operations Favorable basis points on tax rate related to vesting and exercise of stock-based compensation awards Favorable Basis Points On Tax Rate Related To Vesting And Exercise Of Stock Based Compensation Awards Schedule Of Defined Benefit Plans Disclosures [Table] Schedule Of Defined Benefit Plans Disclosures [Table] Pension Retirement Plan Type [Axis] Retirement Plan Type Retirement Plan Type [Domain] Pension Pension Plans Defined Benefit [Member] Postretirement Benefits Other Postretirement Benefit Plans Defined Benefit [Member] Defined Benefit Plan Disclosure [Line Items] Defined Benefit Plan Disclosure [Line Items] Service cost Defined Benefit Plan Service Cost Interest cost Defined Benefit Plan Interest Cost Expected return on assets Defined Benefit Plan Expected Return On Plan Assets Prior service cost (credit) Defined Benefit Plan Amortization Of Prior Service Cost Credit Actuarial loss (gain) Defined Benefit Plan Amortization Of Gains Losses Settlement charge Defined Benefit Plan Recognized Net Gain Loss Due To Settlements1 Special termination benefit Defined Benefit Plan Recognized Net Gain Loss Due To Curtailments Net periodic benefit cost (credit) Defined Benefit Plan Net Periodic Benefit Cost Commitments and contingencies. Commitments and contingencies. Commitments And Contingencies [Table] Commitments And Contingencies [Table] Interest-only loan. Interest-only loan Interest Only Loan [Member] Commitments and Contingencies [Line Items] Commitments And Contingencies [Line Items] Guarantee of affiliate's obligations Guarantee Obligations Maximum Exposure Due from affiliate Due From Affiliates Due date Reportable business segments Schedule Of Segment Reporting Information By Segment [Table] Schedule Of Segment Reporting Information By Segment [Table] Consolidation Items Consolidation Items [Axis] Consolidation Items Consolidation Items [Domain] Operating Segments Operating Segments [Member] Corporate Corporate Non Segment [Member] Magnesia specialties. Magnesia Specialties Magnesia Specialties [Member] Products and Services Product Or Service [Axis] Products and Services Products And Services [Domain] Building materials business. Building Materials Business Building Materials Business [Member] Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Total revenues Net sales Earnings (Loss) from operations Schedule Of Product Information [Table] Schedule Of Product Information [Table] Aggregates. Aggregates Aggregates [Member] Cement. Cement Cement [Member] Ready mixed concrete. Ready Mixed Concrete Ready Mixed Concrete [Member] Asphalt and paving. Asphalt and Paving Asphalt And Paving [Member] Subsegments Consolidation Items Subsegments Consolidation Items [Axis] Subsegments Consolidation Items Subsegments Consolidation Items [Domain] Reportable Subsegments Reportable Subsegments [Member] Interproduct Sales Intersubsegment Eliminations [Member] Product Information [Line Items] Product Information [Line Items] Gross profit (loss) Retirement expense. Component of other income and expense. Other operating income and expense. Other Operating Income And Expense [Table] Other Operating Income And Expense [Table] Other operating income. Other Operating Income, Net Other Operating Income [Member] Title of Individual Title Of Individual [Axis] Relationship to Entity Title Of Individual With Relationship To Entity [Domain] Chief Financial Officer Chief Financial Officer [Member] Component Of Other Income And Expense [Line Items] Component Of Other Income And Expense [Line Items] Nonrecurring repair costs Other Nonrecurring Expense Gain on sale of real estate Gain Loss On Sale Of Properties Retirement related expense including both cash and stock-based compensation Retirement Expense Increase decrease in accrued salaries benefits and payroll taxes. Increase decrease in accrued insurance and other taxes. Other current and noncurrent assets Increase Decrease In Other Operating Assets Accrued salaries, benefits and payroll taxes Increase Decrease In Accrued Salaries Benefits And Payroll Taxes Accrued insurance and other taxes Increase Decrease In Accrued Insurance And Other Taxes Accrued income taxes Increase Decrease In Accrued Income Taxes Payable Accrued pension, postretirement and postemployment benefits Increase Decrease In Pension And Postretirement Obligations Other current and noncurrent liabilities Increase Decrease In Other Operating Liabilities Change in other assets and liabilities, net Accrued liabilities for purchases of property, plant and equipment Capital Expenditures Incurred But Not Yet Paid Acquisition of assets through capital lease Noncash Or Part Noncash Acquisition Other Assets Acquired1 Settlement of royalty obligation via asset sale Settlement Of Asset Retirement Obligations Through Noncash Payments Amount Cash paid for interest Interest Paid Cash paid for income taxes Income Taxes Paid Net Business combination acquired mineral reserves. Business combinations. Schedule of business combinations and dispositions table. Schedule Of Business Combinations And Dispositions [Table] Schedule Of Business Combinations And Dispositions [Table] Geographical Statement Geographical [Axis] Geographical Segment Geographical [Domain] Colorado COLORADO Central Texas TEXAS Business Acquisition Business Acquisition [Axis] Business Acquisition, Acquiree Business Acquisition Acquiree [Domain] Ratliff Ready-Mix Limited Partnership. Ratliff Ratliff Ready Mix Limited Partnership [Member] Business Combinations [Line Items] Business Combinations [Line Items] Acquisition of mineral reserves Business Combination Acquired Mineral Reserves Ownership interest percentage under equity method, prior to acquisition Equity Method Investment Ownership Percentage Gain resulting from re-measurement of existing interest to fair value upon closing of transaction Business Combination Step Acquisition Equity Interest In Acquiree Remeasurement Gain Business combination agreed consideration. Bluegrass Materials Company. Bluegrass Materials Company Bluegrass Materials Company [Member] Business acquisition agreed amount to acquire Business Combination Agreed Consideration