$MLM
MARTIN MARIETTA MATERIALS INC Stock $mlm

$mlm Overview Financials Valuation SEC Filings Company Website

2017 Q4 Form 10-K Financial Statement

#000119312518055887 Filed on February 23, 2018

Income Statement

Concept	2017 Q4	2017	2016 Q4
Revenue	$970.5M	$3.966B	$948.8M
YoY Change	2.29%	3.85%	12.34%
Cost Of Revenue	$711.4M	$2.994B	$723.8M
YoY Change	-1.71%	2.98%	9.72%
Gross Profit	$259.1M	$971.9M	$225.1M
YoY Change	15.1%	6.6%	21.81%
Gross Profit Margin	26.7%	24.51%	23.72%
Selling, General & Admin	$67.00M	$262.1M	$70.30M
YoY Change	-4.69%	8.48%	23.12%
% of Gross Profit	25.86%	26.97%	31.23%
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$75.80M	$297.2M	$73.30M
YoY Change	3.41%	4.19%	15.07%
% of Gross Profit	29.26%	30.58%	32.56%
Operating Expenses	$70.40M	$262.1M	$69.50M
YoY Change	1.29%	8.48%	55.13%
Operating Profit	$188.7M	$700.4M	$155.6M
YoY Change	21.27%	3.42%	11.14%
Interest Expense	-$23.50M	$91.50M	-$20.80M
YoY Change	12.98%	12.03%	10.05%
% of Operating Profit	-12.45%	13.06%	-13.37%
Other Income/Expense, Net	$3.600M	$10.00M	$1.700M
YoY Change	111.76%	-12.58%	-58.54%
Pretax Income	$163.6M	$618.9M	$136.4M
YoY Change	19.94%	1.96%	11.35%
Income Tax	$44.40M	-$94.50M	$37.60M
% Of Pretax Income	27.14%	-15.27%	27.57%
Net Earnings	$377.2M	$713.3M	$98.90M
YoY Change	281.4%	67.68%	18.87%
Net Earnings / Revenue	38.87%	17.99%	10.42%
Basic Earnings Per Share		$11.30
Diluted Earnings Per Share	$5.968M	$11.25	$1.557M
COMMON SHARES
Basic Shares Outstanding		62.90M	63.47M
Diluted Shares Outstanding		63.20M

Balance Sheet

Concept	2017 Q4	2017	2016 Q4
SHORT-TERM ASSETS
Cash & Short-Term Investments	$1.446B	$1.446B	$50.00M
YoY Change	2792.0%	2792.0%	-70.24%
Cash & Equivalents	$1.446B	$1.446B	$50.04M
Short-Term Investments
Other Short-Term Assets	$96.97M	$97.00M	$56.81M
YoY Change	70.67%	70.18%	71.31%
Inventory	$600.6M	$601.0M	$521.6M
Prepaid Expenses
Receivables	$487.2M	$478.0M	$458.0M
Other Receivables	$0.00	$9.000M	$0.00
Total Short-Term Assets	$2.631B	$2.631B	$1.086B
YoY Change	142.19%	142.27%	0.44%
LONG-TERM ASSETS
Property, Plant & Equipment	$3.593B	$3.593B	$3.423B
YoY Change	4.95%	4.97%	8.47%
Goodwill	$2.160B		$2.159B
YoY Change	0.04%		4.4%
Intangibles
YoY Change
Long-Term Investments
YoY Change
Other Assets	$101.9M	$102.0M	$120.5M
YoY Change	-15.42%	-15.0%	-14.67%
Total Long-Term Assets	$6.361B	$6.362B	$6.215B
YoY Change	2.36%	2.37%	5.76%
TOTAL ASSETS
Total Short-Term Assets	$2.631B	$2.631B	$1.086B
Total Long-Term Assets	$6.361B	$6.362B	$6.215B
Total Assets	$8.993B	$8.993B	$7.301B
YoY Change	23.17%	23.17%	4.93%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$183.6M	$184.0M	$178.6M
YoY Change	2.82%	2.79%	8.43%
Accrued Expenses	$123.0M	$123.0M	$117.0M
YoY Change	5.13%	5.13%	14.71%
Deferred Revenue
YoY Change
Short-Term Debt	$0.00	$0.00	$0.00
YoY Change			-100.0%
Long-Term Debt Due	$299.9M	$300.0M	$180.0M
YoY Change	66.58%	66.67%	862.09%
Total Short-Term Liabilities	$694.2M	$694.0M	$546.6M
YoY Change	27.01%	26.87%	49.07%
LONG-TERM LIABILITIES
Long-Term Debt	$2.727B	$2.727B	$1.506B
YoY Change	81.08%	81.08%	-2.83%
Other Long-Term Liabilities	$233.8M	$478.0M	$194.5M
YoY Change	20.2%	7.9%	12.59%
Total Long-Term Liabilities	$2.961B	$3.205B	$1.701B
YoY Change	74.12%	64.44%	-1.29%
TOTAL LIABILITIES
Total Short-Term Liabilities	$694.2M	$694.0M	$546.6M
Total Long-Term Liabilities	$2.961B	$3.205B	$1.701B
Total Liabilities	$4.310B	$4.313B	$3.158B
YoY Change	36.47%	36.44%	9.0%
SHAREHOLDERS EQUITY
Retained Earnings	$1.440B		$935.6M
YoY Change	53.92%		6.99%
Common Stock	$3.369B		$3.335B
YoY Change	1.01%		1.42%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$4.680B	$4.680B	$4.140B
YoY Change
Total Liabilities & Shareholders Equity	$8.993B	$8.993B	$7.301B
YoY Change	23.17%	23.17%	4.93%

Cashflow Statement

Concept	2017 Q4	2017	2016 Q4
OPERATING ACTIVITIES
Net Income	$377.2M	$713.3M	$98.90M
YoY Change	281.4%	67.68%	18.87%
Depreciation, Depletion And Amortization	$75.80M	$297.2M	$73.30M
YoY Change	3.41%	4.19%	15.07%
Cash From Operating Activities	$239.8M	$657.6M	$267.5M
YoY Change	-10.36%	-4.59%	2.49%
INVESTING ACTIVITIES
Capital Expenditures	-$101.6M	$410.3M	-$101.8M
YoY Change	-0.2%	5.95%	-3.78%
Acquisitions		$12.10M
YoY Change		-93.07%
Other Investing Activities	-$400.0K	$23.80M	$1.200M
YoY Change	-133.33%	-114.17%	-119.35%
Cash From Investing Activities	-$101.9M	-$386.1M	-$100.6M
YoY Change	1.29%	-30.47%	-10.26%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net		$100.0M
YoY Change		-57.97%
Debt Paid & Issued, Net		$1.065B
YoY Change		137.03%
Cash From Financing Activities	1.273B	1.125B	-177.6M
YoY Change	-816.95%	-545.87%	-57.41%
NET CHANGE
Cash From Operating Activities	239.8M	657.6M	267.5M
Cash From Investing Activities	-101.9M	-386.1M	-100.6M
Cash From Financing Activities	1.273B	1.125B	-177.6M
Net Change In Cash	1.411B	1.396B	-10.70M
YoY Change	-13288.79%	-1279.68%	-96.01%
FREE CASH FLOW
Cash From Operating Activities	$239.8M	$657.6M	$267.5M
Capital Expenditures	-$101.6M	$410.3M	-$101.8M
Free Cash Flow	$341.4M	$247.3M	$369.3M
YoY Change	-7.55%	-18.1%	0.68%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value
CY2017	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2017
CY2017	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2017	dei	Trading Symbol TradingSymbol	MLM
CY2017	dei	Entity Central Index Key EntityCentralIndexKey	0000916076
CY2017	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2016	us-gaap	Shipping And Handling Revenue ShippingAndHandlingRevenue	241982000
CY2015	us-gaap	Shipping And Handling Revenue ShippingAndHandlingRevenue	271454000
CY2017	us-gaap	Profit Loss ProfitLoss	713385000
CY2016	us-gaap	Profit Loss ProfitLoss	425444000
CY2015	us-gaap	Profit Loss ProfitLoss	288938000
CY2017	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	43000
CY2016	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	58000
CY2015	us-gaap	Net Income Loss Attributable To Noncontrolling Interest NetIncomeLossAttributableToNoncontrollingInterest	146000
CY2018Q1	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	62803002
CY2016	us-gaap	Sales Revenue Goods Net SalesRevenueGoodsNet	3576767000
CY2017	us-gaap	Cost Of Goods Sold CostOfGoodsSold	2749488000
CY2017	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2017	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2017	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2017	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2016	us-gaap	Cost Of Goods Sold CostOfGoodsSold	2665029000
CY2015	us-gaap	Other Operating Income Expense Net OtherOperatingIncomeExpenseNet	-15653000
CY2015	us-gaap	Proceeds From Sales Of Business Affiliate And Productive Assets ProceedsFromSalesOfBusinessAffiliateAndProductiveAssets	448122000
CY2016	us-gaap	Repayments Of Advances For Construction RepaymentsOfAdvancesForConstruction	82910000
CY2015	us-gaap	Repayments Of Advances For Construction RepaymentsOfAdvancesForConstruction	25234000
CY2017	us-gaap	Proceeds From Advances For Construction ProceedsFromAdvancesForConstruction	43594000
CY2017	us-gaap	Gross Profit GrossProfit	971940000
CY2016	us-gaap	Business Combination Acquisition Related Costs BusinessCombinationAcquisitionRelatedCosts	909000
CY2017Q2	dei	Entity Public Float EntityPublicFloat	11664571328
CY2017	us-gaap	Sales Revenue Net SalesRevenueNet	3965594000
CY2017	us-gaap	Sales Revenue Goods Net SalesRevenueGoodsNet	3721428000
CY2015	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	210754000
CY2016	us-gaap	Sales Revenue Net SalesRevenueNet	3818749000
CY2017	us-gaap	Shipping And Handling Revenue ShippingAndHandlingRevenue	244166000
CY2017	us-gaap	Shipping Handling And Transportation Costs ShippingHandlingAndTransportationCosts	244166000
CY2015	us-gaap	Gross Profit GrossProfit	726920000
CY2015	us-gaap	Sales Revenue Net SalesRevenueNet	3539570000
CY2016	us-gaap	Shipping Handling And Transportation Costs ShippingHandlingAndTransportationCosts	241982000
CY2017	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	2993654000
CY2016	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	2907011000
CY2015	us-gaap	Cost Of Goods Sold CostOfGoodsSold	2541196000
CY2015	us-gaap	Shipping Handling And Transportation Costs ShippingHandlingAndTransportationCosts	271454000
CY2017	us-gaap	Business Combination Acquisition Related Costs BusinessCombinationAcquisitionRelatedCosts	8638000
CY2015	us-gaap	Business Combination Acquisition Related Costs BusinessCombinationAcquisitionRelatedCosts	6346000
CY2016	us-gaap	Gross Profit GrossProfit	911738000
CY2015	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	2812650000
CY2017	us-gaap	Other Operating Income Expense Net OtherOperatingIncomeExpenseNet	-793000
CY2017	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	262128000
CY2016	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	241606000
CY2016	us-gaap	Other Operating Income Expense Net OtherOperatingIncomeExpenseNet	8043000
CY2015	us-gaap	Sales Revenue Goods Net SalesRevenueGoodsNet	3268116000
CY2017	dei	Entity Registrant Name EntityRegistrantName	MARTIN MARIETTA MATERIALS INC
CY2015	us-gaap	Participating Securities Distributed And Undistributed Earnings Loss Diluted ParticipatingSecuritiesDistributedAndUndistributedEarningsLossDiluted	1252000
CY2016	us-gaap	Participating Securities Distributed And Undistributed Earnings Loss Diluted ParticipatingSecuritiesDistributedAndUndistributedEarningsLossDiluted	1775000
CY2015	mlm	Basic And Diluted Net Income Loss Attributable To Common Shareholders Of Reporting Entity BasicAndDilutedNetIncomeLossAttributableToCommonShareholdersOfReportingEntity	287540000
CY2016Q4	us-gaap	Inventory Finished Goods InventoryFinishedGoods	479291000
CY2016Q4	us-gaap	Inventory Work In Process And Raw Materials InventoryWorkInProcessAndRawMaterials	61171000
CY2016Q4	us-gaap	Other Inventory Supplies OtherInventorySupplies	116024000
CY2016Q4	us-gaap	Inventory Gross InventoryGross	656486000
CY2016Q4	us-gaap	Inventory Valuation Reserves InventoryValuationReserves	134862000
CY2015	us-gaap	Operating Income Loss OperatingIncomeLoss	494167000
CY2016	us-gaap	Operating Income Loss OperatingIncomeLoss	677266000
CY2017	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	10034000
CY2017	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	618928000
CY2015	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-4079000
CY2017	us-gaap	Interest Expense InterestExpense	91487000
CY2016	us-gaap	Interest Expense InterestExpense	81677000
CY2016	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	11439000
CY2015	us-gaap	Interest Expense InterestExpense	76287000
CY2015	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	413801000
CY2016	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	181584000
CY2016	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	607028000
CY2017	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-94457000
CY2017	us-gaap	Operating Income Loss OperatingIncomeLoss	700381000
CY2015	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	124863000
CY2016	us-gaap	Proceeds From Repayments Of Bank Overdrafts ProceedsFromRepaymentsOfBankOverdrafts	-10235000
CY2015	us-gaap	Proceeds From Advances For Construction ProceedsFromAdvancesForConstruction	25234000
CY2016	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-555313000
CY2016	us-gaap	Proceeds From Advances For Construction ProceedsFromAdvancesForConstruction	82910000
CY2015	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	88546000
CY2017	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	2204000
CY2016	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	2300000
CY2016Q4	us-gaap	Other Intangible Assets Net OtherIntangibleAssetsNet	69110000
CY2016Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	120476000
CY2016Q4	us-gaap	Assets Assets	7300905000
CY2016Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	178598000
CY2016Q4	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	47428000
CY2016Q4	us-gaap	Pension And Other Postretirement And Postemployment Benefit Plans Liabilities Current PensionAndOtherPostretirementAndPostemploymentBenefitPlansLiabilitiesCurrent	9293000
CY2016Q4	us-gaap	Accrual For Taxes Other Than Income Taxes Current AccrualForTaxesOtherThanIncomeTaxesCurrent	60093000
CY2016Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	180036000
CY2016Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	71140000
CY2016Q4	us-gaap	Liabilities Current LiabilitiesCurrent	546588000
CY2016Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	1506153000
CY2016Q4	us-gaap	Pension And Other Postretirement And Postemployment Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementAndPostemploymentBenefitPlansLiabilitiesNoncurrent	248086000
CY2016Q4	us-gaap	Deferred Tax Liabilities Noncurrent DeferredTaxLiabilitiesNoncurrent	663019000
CY2017Q4	us-gaap	Other Inventory Supplies OtherInventorySupplies	128792000
CY2017Q4	us-gaap	Inventory Gross InventoryGross	744552000
CY2017Q4	us-gaap	Inventory Valuation Reserves InventoryValuationReserves	143961000
CY2016Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	194469000
CY2016Q4	us-gaap	Liabilities Liabilities	3158315000
CY2016Q4	us-gaap	Common Stock Value CommonStockValue	630000
CY2016Q4	us-gaap	Preferred Stock Value PreferredStockValue
CY2016Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-130687000
CY2016Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	935574000
CY2016Q4	us-gaap	Minority Interest MinorityInterest	2612000
CY2016Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	4142590000
CY2016Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	7300905000
CY2016Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2016Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	100000000
CY2016Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	62873000
CY2016Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.01
CY2016Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	10000000
CY2016Q4	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	0
CY2017	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	297162000
CY2017	us-gaap	Share Based Compensation ShareBasedCompensation	30460000
CY2017	us-gaap	Gain Loss On Disposition Of Assets GainLossOnDispositionOfAssets	19366000
CY2017	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-239056000
CY2017	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	13157000
CY2016	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	17730000
CY2017	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	29329000
CY2016	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	25072000
CY2017	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	78966000
CY2016	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	47381000
CY2017	us-gaap	Increase Decrease In Accounts Payable Trade IncreaseDecreaseInAccountsPayableTrade	-17874000
CY2016	us-gaap	Increase Decrease In Accounts Payable Trade IncreaseDecreaseInAccountsPayableTrade	-8116000
CY2017	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	-14619000
CY2016	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	11106000
CY2016	us-gaap	Net Income Loss NetIncomeLoss	425386000
CY2015	us-gaap	Net Income Loss NetIncomeLoss	288792000
CY2017	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	11.30
CY2016	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	6.66
CY2017	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	11.25
CY2016	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	6.63
CY2015	us-gaap	Cash Acquired From Acquisition CashAcquiredFromAcquisition	63000
CY2017	us-gaap	Proceeds From Sales Of Business Affiliate And Productive Assets ProceedsFromSalesOfBusinessAffiliateAndProductiveAssets	35941000
CY2016	us-gaap	Proceeds From Sales Of Business Affiliate And Productive Assets ProceedsFromSalesOfBusinessAffiliateAndProductiveAssets	6476000
CY2015	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	4.31
CY2017	us-gaap	Net Income Loss NetIncomeLoss	713342000
CY2015	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax	10299000
CY2017	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	657878000
CY2016	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	689233000
CY2015	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	4.29
CY2017	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	62932000
CY2016	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	63610000
CY2015	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	66770000
CY2017	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	63217000
CY2016	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	63861000
CY2015	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	67020000
CY2017	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax	-8052000
CY2016	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax	-31620000
CY2015	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Net Of Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodNetOfTax	-7101000
CY2017	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Net Of Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax	-883000
CY2016	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Net Of Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax	-992000
CY2015	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Net Of Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditNetOfTax	-1149000
CY2017	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax	8503000
CY2016	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossNetOfTax	7138000
CY2017	us-gaap	Other Comprehensive Income Loss Finalization Of Pension And Non Pension Postretirement Plan Valuation Net Of Tax OtherComprehensiveIncomeLossFinalizationOfPensionAndNonPensionPostretirementPlanValuationNetOfTax	13000
CY2016	us-gaap	Other Comprehensive Income Loss Finalization Of Pension And Non Pension Postretirement Plan Valuation Net Of Tax OtherComprehensiveIncomeLossFinalizationOfPensionAndNonPensionPostretirementPlanValuationNetOfTax	71000
CY2016	mlm	Other Comprehensive Income Loss Net Periodic Pension Cost Due To Special Plan Termination Benefits Net Of Tax OtherComprehensiveIncomeLossNetPeriodicPensionCostDueToSpecialPlanTerminationBenefitsNetOfTax	471000
CY2015	mlm	Other Comprehensive Income Loss Net Periodic Pension Cost Due To Special Plan Termination Benefits Net Of Tax OtherComprehensiveIncomeLossNetPeriodicPensionCostDueToSpecialPlanTerminationBenefitsNetOfTax	1274000
CY2017	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-419000
CY2016	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-24932000
CY2015	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	3323000
CY2017	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	1140000
CY2016	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	-898000
CY2015	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	-3542000
CY2017	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax	872000
CY2016	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax	826000
CY2015	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesNetOfTax	771000
CY2017	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	1593000
CY2016	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-25004000
CY2015	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	552000
CY2017	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	714978000
CY2016	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	400440000
CY2015	us-gaap	Comprehensive Income Net Of Tax Including Portion Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxIncludingPortionAttributableToNoncontrollingInterest	289490000
CY2017	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	53000
CY2016	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	119000
CY2015	us-gaap	Comprehensive Income Net Of Tax Attributable To Noncontrolling Interest ComprehensiveIncomeNetOfTaxAttributableToNoncontrollingInterest	161000
CY2017	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	714925000
CY2016	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	400321000
CY2015	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	289329000
CY2017	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax	-2625000
CY2016	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax	-19734000
CY2015	us-gaap	Other Comprehensive Income Defined Benefit Plans Net Unamortized Gain Loss Arising During Period Tax OtherComprehensiveIncomeDefinedBenefitPlansNetUnamortizedGainLossArisingDuringPeriodTax	-4530000
CY2017	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax	-547000
CY2016	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax	-617000
CY2015	us-gaap	Other Comprehensive Income Loss Amortization Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Prior Service Cost Credit Tax OtherComprehensiveIncomeLossAmortizationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetPriorServiceCostCreditTax	-731000
CY2017	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax	5271000
CY2016	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax	4437000
CY2015	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci Pension And Other Postretirement Benefit Plans For Net Gain Loss Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIPensionAndOtherPostretirementBenefitPlansForNetGainLossTax	6551000
CY2017	us-gaap	Other Comprehensive Income Finalization Of Pension And Non Pension Postretirement Plan Valuation Tax OtherComprehensiveIncomeFinalizationOfPensionAndNonPensionPostretirementPlanValuationTax	8000
CY2016	us-gaap	Other Comprehensive Income Finalization Of Pension And Non Pension Postretirement Plan Valuation Tax OtherComprehensiveIncomeFinalizationOfPensionAndNonPensionPostretirementPlanValuationTax	44000
CY2015	us-gaap	Other Comprehensive Income Finalization Of Pension And Non Pension Postretirement Plan Valuation Tax OtherComprehensiveIncomeFinalizationOfPensionAndNonPensionPostretirementPlanValuationTax	0
CY2017	mlm	Other Comprehensive Income Net Periodic Pension Cost Due To Special Plan Termination Benefits Tax OtherComprehensiveIncomeNetPeriodicPensionCostDueToSpecialPlanTerminationBenefitsTax	0
CY2016	mlm	Other Comprehensive Income Net Periodic Pension Cost Due To Special Plan Termination Benefits Tax OtherComprehensiveIncomeNetPeriodicPensionCostDueToSpecialPlanTerminationBenefitsTax	293000
CY2015	mlm	Other Comprehensive Income Net Periodic Pension Cost Due To Special Plan Termination Benefits Tax OtherComprehensiveIncomeNetPeriodicPensionCostDueToSpecialPlanTerminationBenefitsTax	811000
CY2017	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesTax	571000
CY2015	us-gaap	Proceeds From Repayments Of Bank Overdrafts ProceedsFromRepaymentsOfBankOverdrafts	10052000
CY2016	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	105036000
CY2016	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	259228000
CY2017	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	410325000
CY2016	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	387267000
CY2017	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-386479000
CY2017	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	2408830000
CY2016	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	560000000
CY2017	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	1065048000
CY2016	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	449306000
CY2017	mlm	Payments Of Deferred Acquisition Consideration PaymentsOfDeferredAcquisitionConsideration	2774000
CY2017	us-gaap	Repayments Of Long Term Capital Lease Obligations RepaymentsOfLongTermCapitalLeaseObligations	3543000
CY2016	us-gaap	Repayments Of Long Term Capital Lease Obligations RepaymentsOfLongTermCapitalLeaseObligations	3364000
CY2015	us-gaap	Repayments Of Long Term Capital Lease Obligations RepaymentsOfLongTermCapitalLeaseObligations	6616000
CY2017	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	108852000
CY2015	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	107462000
CY2015	us-gaap	Payments Of Dividends Minority Interest PaymentsOfDividendsMinorityInterest	325000
CY2017	us-gaap	Proceeds From Minority Shareholders ProceedsFromMinorityShareholders	212000
CY2016	us-gaap	Proceeds From Minority Shareholders ProceedsFromMinorityShareholders	44000
CY2017	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	99999000
CY2015	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	519962000
CY2017	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	10110000
CY2016	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	27257000
CY2015	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	37230000
CY2017	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	11805000
CY2016	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	9723000
CY2015	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	7601000
CY2017	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	1124927000
CY2016	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-252291000
CY2017	us-gaap	Participating Securities Distributed And Undistributed Earnings Loss Diluted ParticipatingSecuritiesDistributedAndUndistributedEarningsLossDiluted	2029000
CY2017	mlm	Basic And Diluted Net Income Loss Attributable To Common Shareholders Of Reporting Entity BasicAndDilutedNetIncomeLossAttributableToCommonShareholdersOfReportingEntity	711313000
CY2016	mlm	Basic And Diluted Net Income Loss Attributable To Common Shareholders Of Reporting Entity BasicAndDilutedNetIncomeLossAttributableToCommonShareholdersOfReportingEntity	423611000
CY2016	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesTax	541000
CY2017Q4	us-gaap	Pension And Other Postretirement And Postemployment Benefit Plans Liabilities Current PensionAndOtherPostretirementAndPostemploymentBenefitPlansLiabilitiesCurrent	13652000
CY2017Q4	us-gaap	Accrual For Taxes Other Than Income Taxes Current AccrualForTaxesOtherThanIncomeTaxesCurrent	64958000
CY2015	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci On Derivatives Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIOnDerivativesTax	509000
CY2017Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	1446364000
CY2016Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	50038000
CY2017Q4	us-gaap	Accounts And Other Receivables Net Current AccountsAndOtherReceivablesNetCurrent	487240000
CY2016Q4	us-gaap	Accounts And Other Receivables Net Current AccountsAndOtherReceivablesNetCurrent	457910000
CY2017Q4	us-gaap	Inventory Net InventoryNet	600591000
CY2016Q4	us-gaap	Inventory Net InventoryNet	521624000
CY2017Q4	us-gaap	Other Assets Current OtherAssetsCurrent	96965000
CY2016Q4	us-gaap	Other Assets Current OtherAssetsCurrent	56813000
CY2017Q4	us-gaap	Assets Current AssetsCurrent	2631160000
CY2016Q4	us-gaap	Assets Current AssetsCurrent	1086385000
CY2017Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	3592813000
CY2016Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	3423395000
CY2017Q4	us-gaap	Goodwill Goodwill	2160290000
CY2016Q4	us-gaap	Goodwill Goodwill	2159337000
CY2017Q4	mlm	Intangible Assets Operating Permits Net IntangibleAssetsOperatingPermitsNet	439116000
CY2016Q4	mlm	Intangible Assets Operating Permits Net IntangibleAssetsOperatingPermitsNet	442202000
CY2017Q4	us-gaap	Other Intangible Assets Net OtherIntangibleAssetsNet	67233000
CY2017Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	101899000
CY2017Q4	us-gaap	Assets Assets	8992511000
CY2017Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	183638000
CY2017Q4	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	44255000
CY2017Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	299909000
CY2017Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	87804000
CY2017Q4	us-gaap	Liabilities Current LiabilitiesCurrent	694216000
CY2017Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	2727294000
CY2017Q4	us-gaap	Pension And Other Postretirement And Postemployment Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementAndPostemploymentBenefitPlansLiabilitiesNoncurrent	244043000
CY2017Q4	us-gaap	Deferred Tax Liabilities Noncurrent DeferredTaxLiabilitiesNoncurrent	410723000
CY2017Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	233758000
CY2017Q4	us-gaap	Liabilities Liabilities	4310034000
CY2017Q4	us-gaap	Common Stock Value CommonStockValue	628000
CY2017Q4	us-gaap	Preferred Stock Value PreferredStockValue
CY2017Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	3368007000
CY2016Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	3334461000
CY2017Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-129104000
CY2017Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	1440069000
CY2017Q4	us-gaap	Stockholders Equity StockholdersEquity	4679600000
CY2016Q4	us-gaap	Stockholders Equity StockholdersEquity	4139978000
CY2017Q4	us-gaap	Minority Interest MinorityInterest	2877000
CY2017Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	4682477000
CY2017Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	8992511000
CY2017Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2017Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	100000000
CY2017Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	62873000
CY2017Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.01
CY2017Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	10000000
CY2017Q4	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	0
CY2017	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	713385000
CY2016	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	425444000
CY2015	us-gaap	Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest	288938000
CY2016	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	285253000
CY2015	us-gaap	Share Based Compensation ShareBasedCompensation	13589000
CY2015	us-gaap	Gain Loss On Disposition Of Assets GainLossOnDispositionOfAssets	-14093000
CY2015	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	85225000
CY2015	us-gaap	Other Noncash Income Expense OtherNoncashIncomeExpense	5972000
CY2015	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	-12309000
CY2015	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	21525000
CY2015	us-gaap	Increase Decrease In Accounts Payable Trade IncreaseDecreaseInAccountsPayableTrade	-40053000
CY2015	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	29591000
CY2015	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	318232000
CY2015	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	263587000
CY2016	us-gaap	Share Based Compensation ShareBasedCompensation	20481000
CY2016	us-gaap	Gain Loss On Disposition Of Assets GainLossOnDispositionOfAssets	-410000
CY2016	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	67050000
CY2015	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	580600000
CY2017	us-gaap	Payments To Acquire Businesses Gross PaymentsToAcquireBusinessesGross	12095000
CY2016	us-gaap	Payments To Acquire Businesses Gross PaymentsToAcquireBusinessesGross	178768000
CY2015	us-gaap	Payments To Acquire Businesses Gross PaymentsToAcquireBusinessesGross	43215000
CY2016	us-gaap	Cash Acquired From Acquisition CashAcquiredFromAcquisition	4246000
CY2017	us-gaap	Repayments Of Advances For Construction RepaymentsOfAdvancesForConstruction	43594000
CY2015	us-gaap	Proceeds From Collection Of Advance To Affiliate ProceedsFromCollectionOfAdvanceToAffiliate	1808000
CY2015	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	230000000
CY2015	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	244704000
CY2016	us-gaap	Payments Of Dividends Minority Interest PaymentsOfDividendsMinorityInterest	400000
CY2015	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-609388000
CY2017	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	1396326000
CY2016	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	-118371000
CY2015	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	59758000
CY2015Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	168409000
CY2014Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	108651000
CY2014Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	4352748000
CY2015	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	107462000
CY2015	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	30624000
CY2015	us-gaap	Stock Repurchased During Period Value StockRepurchasedDuringPeriodValue	519962000
CY2015	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	13589000
CY2015	us-gaap	Noncontrolling Interest Increase From Business Combination NoncontrollingInterestIncreaseFromBusinessCombination	1475000
CY2015	us-gaap	Minority Interest Decrease From Redemptions MinorityInterestDecreaseFromRedemptions	325000
CY2015Q4	us-gaap	Stockholders Equity Including Portion Attributable To Noncontrolling Interest StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest	4060177000
CY2016	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	105036000
CY2016	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	26112000
CY2016	us-gaap	Stock Repurchased During Period Value StockRepurchasedDuringPeriodValue	259228000
CY2016	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	20481000
CY2016	us-gaap	Minority Interest Decrease From Distributions To Noncontrolling Interest Holders MinorityInterestDecreaseFromDistributionsToNoncontrollingInterestHolders	400000
CY2016	us-gaap	Noncontrolling Interest Increase From Subsidiary Equity Issuance NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance	44000
CY2017	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	108852000
CY2017	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	14893000
CY2017	us-gaap	Adjustments Related To Tax Withholding For Share Based Compensation AdjustmentsRelatedToTaxWithholdingForShareBasedCompensation	11805000
CY2017	us-gaap	Stock Repurchased During Period Value StockRepurchasedDuringPeriodValue	99999000
CY2017	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	30460000
CY2017	us-gaap	Noncontrolling Interest Increase From Subsidiary Equity Issuance NoncontrollingInterestIncreaseFromSubsidiaryEquityIssuance	212000
CY2017	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	1.72
CY2016	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	1.64
CY2015	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	1.60
CY2017	us-gaap	Use Of Estimates UseOfEstimates	<div> <p style="text-align:justify;margin-bottom:0pt;margin-top:12pt;text-indent:0%;font-weight:bold;font-style:italic;font-size:11pt;font-family:Calibri;text-transform:none;font-variant: normal;">Use of Estimates. <font style="font-weight:normal;font-style:normal;">The preparation of the Company’s consolidated financial statements in conformity with accounting principles generally accepted in the United States (U.S. GAAP) requires management to make certain estimates and assumptions about future events. These estimates and the underlying assumptions affect the amounts of assets and liabilities reported, disclosures about contingent assets and liabilities and reported amounts of revenues and expenses. Such estimates include the valuation of accounts receivable, inventories, goodwill, intangible assets and other long-lived assets and assumptions used in the calculation of income tax (benefit) expense, retirement and other postemployment benefits, and the allocation of the purchase price to the fair values of assets acquired and liabilities assumed as part of business combinations.  These estimates and assumptions are based on management’s judgment. Management evaluates estimates and assumptions on an ongoing basis using historical experience and other factors, including the current economic environment, and adjusts such estimates and assumptions when facts and circumstances dictate. Changes in credit, equity and energy markets and changes in construction activity increase the uncertainty inherent in certain estimates and assumptions. As future events and their effects cannot be determined with precision, actual results could differ significantly from estimates. Changes in estimates, including those resulting from continuing changes in the economic environment, are reflected in the consolidated financial statements for the period in which the change in estimate occurs. </font></p></div>
CY2015	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate	0.0220
CY2017Q4	mlm	Number Of States With Aggregates Business Sales By Destination NumberOfStatesWithAggregatesBusinessSalesByDestination	30
CY2017	mlm	Number Of Cement Plants NumberOfCementPlants	2
CY2017	mlm	Number Of Quarries And Yards NumberOfQuarriesAndYards	282
CY2017	mlm	Number Of Cement Distribution Facilities NumberOfCementDistributionFacilities	5
CY2016	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	251000
CY2015	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	250000
CY2017	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	230000
CY2017	us-gaap	Goodwill Purchase Accounting Adjustments GoodwillPurchaseAccountingAdjustments	723000
CY2016	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	425386000
CY2015	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	288792000
CY2017	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	285000
CY2015	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Dividend Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate	0.0120
CY2015	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate	0.3610
CY2015	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Fair Value Assumptions Expected Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1	P8Y6M
CY2015	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	57.71
CY2017	mlm	Minimum Likelihood For Recognition Of Tax Benefit Related To Uncertain Tax Position MinimumLikelihoodForRecognitionOfTaxBenefitRelatedToUncertainTaxPosition	0.50
CY2017	us-gaap	Other Comprehensive Income Loss Before Reclassifications Net Of Tax OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	-6922000
CY2017	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	-8505000
CY2017	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	1583000
CY2017Q4	us-gaap	Deferred Tax Assets Other Comprehensive Loss DeferredTaxAssetsOtherComprehensiveLoss	80116000
CY2016	us-gaap	Other Comprehensive Income Loss Before Reclassifications Net Of Tax OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	-32576000
CY2016	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	-7511000
CY2016	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-25065000
CY2016Q4	us-gaap	Deferred Tax Assets Other Comprehensive Loss DeferredTaxAssetsOtherComprehensiveLoss	82793000
CY2015	us-gaap	Other Comprehensive Income Loss Before Reclassifications Net Of Tax OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	-10658000
CY2015	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	-11195000
CY2015	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	537000
CY2015Q4	us-gaap	Deferred Tax Assets Other Comprehensive Loss DeferredTaxAssetsOtherComprehensiveLoss	67757000
CY2017	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	713342000
CY2015Q4	us-gaap	Goodwill Goodwill	2068235000
CY2016	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	91174000
CY2016	us-gaap	Goodwill Written Off Related To Sale Of Business Unit GoodwillWrittenOffRelatedToSaleOfBusinessUnit	72000
CY2017Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	540727000
CY2016Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	536870000
CY2017Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	68255000
CY2016Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	54155000
CY2017Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	472472000
CY2016Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	482715000
CY2017Q4	us-gaap	Indefinite Lived Intangible Assets Excluding Goodwill IndefiniteLivedIntangibleAssetsExcludingGoodwill	33877000
CY2016Q4	us-gaap	Indefinite Lived Intangible Assets Excluding Goodwill IndefiniteLivedIntangibleAssetsExcludingGoodwill	28597000
CY2017	mlm	Finite Lived And Indefinite Lived Intangible Assets Acquired FiniteLivedAndIndefiniteLivedIntangibleAssetsAcquired	10270000
CY2017	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	14178000
CY2016	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	13922000
CY2015	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	13962000
CY2017Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	13070000
CY2017Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	12114000
CY2017Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	12078000
CY2017Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	11387000
CY2017Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Five FiniteLivedIntangibleAssetsAmortizationExpenseYearFive	9805000
CY2017Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense After Year Five FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive	414018000
CY2017Q4	us-gaap	Accounts Receivable Gross Current AccountsReceivableGrossCurrent	480073000
CY2016Q4	us-gaap	Accounts Receivable Gross Current AccountsReceivableGrossCurrent	456508000
CY2017Q4	us-gaap	Other Receivables Gross Current OtherReceivablesGrossCurrent	9557000
CY2016Q4	us-gaap	Other Receivables Gross Current OtherReceivablesGrossCurrent	7668000
CY2017Q4	mlm	Accounts And Other Receivables Gross Current AccountsAndOtherReceivablesGrossCurrent	489630000
CY2016Q4	mlm	Accounts And Other Receivables Gross Current AccountsAndOtherReceivablesGrossCurrent	464176000
CY2017Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	2390000
CY2016Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	6266000
CY2017Q4	us-gaap	Due From Affiliate Current DueFromAffiliateCurrent	2819000
CY2016Q4	us-gaap	Due From Affiliate Current DueFromAffiliateCurrent	2578000
CY2017Q4	us-gaap	Inventory Finished Goods InventoryFinishedGoods	552999000
CY2017Q4	us-gaap	Inventory Work In Process And Raw Materials InventoryWorkInProcessAndRawMaterials	62761000
CY2017Q4	mlm	Land And Land Improvements Gross LandAndLandImprovementsGross	974622000
CY2016Q4	mlm	Land And Land Improvements Gross LandAndLandImprovementsGross	915158000
CY2017Q4	us-gaap	Mineral Properties Gross MineralPropertiesGross	1162289000
CY2016Q4	us-gaap	Mineral Properties Gross MineralPropertiesGross	1114560000
CY2017Q4	us-gaap	Buildings And Improvements Gross BuildingsAndImprovementsGross	154564000
CY2016Q4	us-gaap	Buildings And Improvements Gross BuildingsAndImprovementsGross	151115000
CY2017Q4	us-gaap	Machinery And Equipment Gross MachineryAndEquipmentGross	4006619000
CY2016Q4	us-gaap	Machinery And Equipment Gross MachineryAndEquipmentGross	3766975000
CY2017Q4	us-gaap	Construction In Progress Gross ConstructionInProgressGross	199973000
CY2016Q4	us-gaap	Construction In Progress Gross ConstructionInProgressGross	167722000
CY2017Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	6498067000
CY2016Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	6115530000
CY2017Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	2905254000
CY2016Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	2692135000
CY2017Q4	us-gaap	Capital Leased Assets Gross CapitalLeasedAssetsGross	23919000
CY2016Q4	us-gaap	Capital Leased Assets Gross CapitalLeasedAssetsGross	23117000
CY2017Q4	us-gaap	Capital Leases Lessee Balance Sheet Assets By Major Class Accumulated Deprecation CapitalLeasesLesseeBalanceSheetAssetsByMajorClassAccumulatedDeprecation	11243000
CY2016Q4	us-gaap	Capital Leases Lessee Balance Sheet Assets By Major Class Accumulated Deprecation CapitalLeasesLesseeBalanceSheetAssetsByMajorClassAccumulatedDeprecation	8077000
CY2017Q4	us-gaap	Capital Leases Balance Sheet Assets By Major Class Net CapitalLeasesBalanceSheetAssetsByMajorClassNet	12676000
CY2016Q4	us-gaap	Capital Leases Balance Sheet Assets By Major Class Net CapitalLeasesBalanceSheetAssetsByMajorClassNet	15040000
CY2017	mlm	Depreciation And Depletion And Amortization Excluding Portion Attributable To Machinery And Equipment Under Capital Leases DepreciationAndDepletionAndAmortizationExcludingPortionAttributableToMachineryAndEquipmentUnderCapitalLeases	279808000
CY2016	mlm	Depreciation And Depletion And Amortization Excluding Portion Attributable To Machinery And Equipment Under Capital Leases DepreciationAndDepletionAndAmortizationExcludingPortionAttributableToMachineryAndEquipmentUnderCapitalLeases	268935000
CY2015	mlm	Depreciation And Depletion And Amortization Excluding Portion Attributable To Machinery And Equipment Under Capital Leases DepreciationAndDepletionAndAmortizationExcludingPortionAttributableToMachineryAndEquipmentUnderCapitalLeases	246874000
CY2017	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	3616000
CY2016	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	3543000
CY2015	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	5832000
CY2017Q4	us-gaap	Long Term Debt LongTermDebt	3027203000
CY2016Q4	us-gaap	Long Term Debt LongTermDebt	1686189000
CY2017	us-gaap	Debt Instrument Redemption Price Percentage DebtInstrumentRedemptionPricePercentage	1.01
CY2017Q2	us-gaap	Debt Instrument Redemption Price Percentage Of Principal Amount Redeemed DebtInstrumentRedemptionPricePercentageOfPrincipalAmountRedeemed	1.00
CY2017Q4	us-gaap	Debt Instrument Redemption Price Percentage DebtInstrumentRedemptionPricePercentage	1.01
CY2017	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.35
CY2016	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	97975000
CY2015	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	20627000
CY2016	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	68899000
CY2015	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	85295000
CY2017	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	19424000
CY2017	mlm	Increase Decrease In Accrued Salaries Benefits And Payroll Taxes IncreaseDecreaseInAccruedSalariesBenefitsAndPayrollTaxes	136000
CY2017	mlm	Increase Decrease In Accrued Insurance And Other Taxes IncreaseDecreaseInAccruedInsuranceAndOtherTaxes	4866000
CY2017	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	-11044000
CY2017	us-gaap	Increase Decrease In Pension And Postretirement Obligations IncreaseDecreaseInPensionAndPostretirementObligations	1980000
CY2016	us-gaap	Federal Income Tax Expense Benefit Continuing Operations FederalIncomeTaxExpenseBenefitContinuingOperations	166874000
CY2015	us-gaap	Federal Income Tax Expense Benefit Continuing Operations FederalIncomeTaxExpenseBenefitContinuingOperations	105922000
CY2016	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	15189000
CY2015	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	18153000
CY2016	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-1149000
CY2015	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	930000
CY2016	us-gaap	State And Local Income Tax Expense Benefit Continuing Operations StateAndLocalIncomeTaxExpenseBenefitContinuingOperations	14040000
CY2015	us-gaap	State And Local Income Tax Expense Benefit Continuing Operations StateAndLocalIncomeTaxExpenseBenefitContinuingOperations	19083000
CY2016	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	1064000
CY2015	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	99000
CY2016	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	-394000
CY2015	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	-241000
CY2016	us-gaap	Foreign Income Tax Expense Benefit Continuing Operations ForeignIncomeTaxExpenseBenefitContinuingOperations	670000
CY2015	us-gaap	Foreign Income Tax Expense Benefit Continuing Operations ForeignIncomeTaxExpenseBenefitContinuingOperations	-142000
CY2017	mlm	Tax Cuts And Jobs Act Of2017 Incomplete Accounting Change In Tax Rate Deferred Tax Liability Provisional Income Tax Expense Benefit TaxCutsAndJobsActOf2017IncompleteAccountingChangeInTaxRateDeferredTaxLiabilityProvisionalIncomeTaxExpenseBenefit	258103000
CY2016	mlm	Income Tax Benefit From Operating Loss Carry Forwards Utilized During Period IncomeTaxBenefitFromOperatingLossCarryForwardsUtilizedDuringPeriod	11852000
CY2015	mlm	Income Tax Benefit From Operating Loss Carry Forwards Utilized During Period IncomeTaxBenefitFromOperatingLossCarryForwardsUtilizedDuringPeriod	156554000
CY2015	us-gaap	Adjustments To Additional Paid In Capital Tax Effect From Share Based Compensation AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation	871000
CY2015	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	-1175000
CY2017	us-gaap	Effective Income Tax Rate Reconciliation Change In Enacted Tax Rate EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate	-0.417
CY2015	mlm	Effective Income Tax Rate Reconciliation Statutory Depletion Deduction EffectiveIncomeTaxRateReconciliationStatutoryDepletionDeduction	0.078
CY2015	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.030
CY2015	us-gaap	Effective Income Tax Rate Reconciliation Deductions EffectiveIncomeTaxRateReconciliationDeductions	0.001
CY2017	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Share Based Compensation Cost EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost	0.010
CY2016	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Share Based Compensation Cost EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost	0.001
CY2015	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Share Based Compensation Cost EffectiveIncomeTaxRateReconciliationNondeductibleExpenseShareBasedCompensationCost	0.003
CY2017	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	-0.013
CY2016	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	0.009
CY2015	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	0.004
CY2017	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	-0.153
CY2016	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.299
CY2015	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.302
CY2017	us-gaap	Effective Income Tax Rate Reconciliation Deductions Qualified Production Activities EffectiveIncomeTaxRateReconciliationDeductionsQualifiedProductionActivities	0.09
CY2017	us-gaap	Income Tax Reconciliation Deductions IncomeTaxReconciliationDeductions	15461000
CY2016	us-gaap	Income Tax Reconciliation Deductions IncomeTaxReconciliationDeductions	13583000
CY2015	us-gaap	Income Tax Reconciliation Deductions IncomeTaxReconciliationDeductions	222000
CY2017Q4	mlm	Increase Decrease In Net Earnings Per Share Related To Production Deduction Benefit IncreaseDecreaseInNetEarningsPerShareRelatedToProductionDeductionBenefit	0.25
CY2016Q4	mlm	Increase Decrease In Net Earnings Per Share Related To Production Deduction Benefit IncreaseDecreaseInNetEarningsPerShareRelatedToProductionDeductionBenefit	0.21
CY2015Q4	mlm	Increase Decrease In Net Earnings Per Share Related To Production Deduction Benefit IncreaseDecreaseInNetEarningsPerShareRelatedToProductionDeductionBenefit	0.01
CY2017Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Employee Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits	16059000
CY2016Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Employee Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits	61462000
CY2016Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards Alternative Minimum Tax DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax	2771000
CY2017Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	187186000
CY2017Q4	us-gaap	Deferred Tax Assets Inventory DeferredTaxAssetsInventory	56242000
CY2016Q4	us-gaap	Deferred Tax Assets Inventory DeferredTaxAssetsInventory	71490000
CY2017Q4	mlm	Deferred Tax Assets Valuation And Other Reserves DeferredTaxAssetsValuationAndOtherReserves	22989000
CY2016Q4	mlm	Deferred Tax Assets Valuation And Other Reserves DeferredTaxAssetsValuationAndOtherReserves	38206000
CY2017Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	11780000
CY2016Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	10507000
CY2016Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	267229000
CY2017Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	10349000
CY2016Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	8521000
CY2017Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	176837000
CY2016Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	258708000
CY2017Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	407400000
CY2016Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	635576000
CY2017Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets DeferredTaxLiabilitiesGoodwillAndIntangibleAssets	168506000
CY2016Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets DeferredTaxLiabilitiesGoodwillAndIntangibleAssets	268999000
CY2017Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	11654000
CY2016Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	17152000
CY2017Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	587560000
CY2016Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	921727000
CY2017Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	410723000
CY2016Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	663019000
CY2017	mlm	Domestic And Foreign Operating Loss Carry Forward Expiration Date DomesticAndForeignOperatingLossCarryForwardExpirationDate	2036
CY2017Q4	us-gaap	Operating Loss Carryforwards Valuation Allowance OperatingLossCarryforwardsValuationAllowance	10085000
CY2016Q4	us-gaap	Operating Loss Carryforwards Valuation Allowance OperatingLossCarryforwardsValuationAllowance	8303000
CY2016Q4	mlm	Alternative Minimum Tax Credit Carryforward AlternativeMinimumTaxCreditCarryforward	17192000
CY2017	mlm	Tax Cuts And Jobs Act Of2017 Change In Tax Rate For Executive Compensation Deduction Limitation Amount TaxCutsAndJobsActOf2017ChangeInTaxRateForExecutiveCompensationDeductionLimitationAmount	1000000
CY2016Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	21807000
CY2015Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	18727000
CY2014Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	21107000
CY2016	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	38566000
CY2016	us-gaap	Noncash Or Part Noncash Acquisition Other Assets Acquired1 NoncashOrPartNoncashAcquisitionOtherAssetsAcquired1	1399000
CY2015	us-gaap	Noncash Or Part Noncash Acquisition Other Assets Acquired1 NoncashOrPartNoncashAcquisitionOtherAssetsAcquired1	1445000
CY2015	us-gaap	Noncash Or Part Noncash Acquisition Fixed Assets Acquired1 NoncashOrPartNoncashAcquisitionFixedAssetsAcquired1	5000000
CY2015	us-gaap	Interest Paid InterestPaid	71011000
CY2015	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	46774000
CY2017	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	1396000
CY2016	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	2401000
CY2015	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	4978000
CY2015	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	3079000
CY2017	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromCurrentPeriodTaxPositions	946000
CY2016	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromCurrentPeriodTaxPositions	2047000
CY2016Q4	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	596207000
CY2016	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	4650000
CY2017Q4	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	638106000
CY2017	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	672000
CY2016	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	1924000
CY2015	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	3512000
CY2017	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	4961000
CY2015	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromCurrentPeriodTaxPositions	594000
CY2017	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	4179000
CY2015	us-gaap	Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	6331000
CY2017Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	22367000
CY2017Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	10399000
CY2016Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	11603000
CY2015Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	7975000
CY2017Q4	us-gaap	Decrease In Unrecognized Tax Benefits Is Reasonably Possible DecreaseInUnrecognizedTaxBenefitsIsReasonablyPossible	3333000
CY2017	mlm	Jurisdictions Statute Of Limitations Expiration Year JurisdictionsStatuteOfLimitationsExpirationYear	2014
CY2017Q4	mlm	Income Tax Examination Liability Refund Adjustment From Settlement With Taxing Authority Per Share IncomeTaxExaminationLiabilityRefundAdjustmentFromSettlementWithTaxingAuthorityPerShare	0.06
CY2015Q4	mlm	Income Tax Examination Liability Refund Adjustment From Settlement With Taxing Authority Per Share IncomeTaxExaminationLiabilityRefundAdjustmentFromSettlementWithTaxingAuthorityPerShare	0.04
CY2017Q4	us-gaap	Income Tax Examination Liability Refund Adjustment From Settlement With Taxing Authority IncomeTaxExaminationLiabilityRefundAdjustmentFromSettlementWithTaxingAuthority	-3922000
CY2015Q4	us-gaap	Income Tax Examination Liability Refund Adjustment From Settlement With Taxing Authority IncomeTaxExaminationLiabilityRefundAdjustmentFromSettlementWithTaxingAuthority	-2364000
CY2017Q4	us-gaap	Defined Benefit Pension Plan Liabilities Current DefinedBenefitPensionPlanLiabilitiesCurrent	11092000
CY2016Q4	us-gaap	Defined Benefit Pension Plan Liabilities Current DefinedBenefitPensionPlanLiabilitiesCurrent	6223000
CY2017Q4	us-gaap	Defined Benefit Pension Plan Liabilities Noncurrent DefinedBenefitPensionPlanLiabilitiesNoncurrent	230137000
CY2016Q4	us-gaap	Defined Benefit Pension Plan Liabilities Noncurrent DefinedBenefitPensionPlanLiabilitiesNoncurrent	229419000
CY2017Q4	us-gaap	Defined Benefit Pension Plan Current And Noncurrent Liabilities DefinedBenefitPensionPlanCurrentAndNoncurrentLiabilities	241229000
CY2016Q4	us-gaap	Defined Benefit Pension Plan Current And Noncurrent Liabilities DefinedBenefitPensionPlanCurrentAndNoncurrentLiabilities	235642000
CY2017Q4	us-gaap	Defined Benefit Plan Accumulated Benefit Obligation DefinedBenefitPlanAccumulatedBenefitObligation	792912000
CY2016Q4	us-gaap	Defined Benefit Plan Accumulated Benefit Obligation DefinedBenefitPlanAccumulatedBenefitObligation	752659000
CY2017Q4	us-gaap	Defined Benefit Plan Plan Assets Target Allocation Percentage DefinedBenefitPlanPlanAssetsTargetAllocationPercentage	1.00
CY2017Q4	us-gaap	Defined Benefit Plan Weighted Average Asset Allocations DefinedBenefitPlanWeightedAverageAssetAllocations	1.00
CY2016Q4	us-gaap	Defined Benefit Plan Weighted Average Asset Allocations DefinedBenefitPlanWeightedAverageAssetAllocations	1.00
CY2016Q4	us-gaap	Other Postretirement Defined Benefit Plan Liabilities Noncurrent OtherPostretirementDefinedBenefitPlanLiabilitiesNoncurrent	17521000
CY2017	mlm	Future Share Based Compensation Expense Year Five FutureShareBasedCompensationExpenseYearFive	94000
CY2017Q4	us-gaap	Other Postretirement Defined Benefit Plan Liabilities Current And Noncurrent OtherPostretirementDefinedBenefitPlanLiabilitiesCurrentAndNoncurrent	15347000
CY2017	mlm	Future Share Based Compensation Expense FutureShareBasedCompensationExpense	24866000
CY2017	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures And Expirations In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod	840
CY2017	us-gaap	Operating Leases Rent Expense Net OperatingLeasesRentExpenseNet	90731000
CY2017Q4	us-gaap	Other Postretirement Defined Benefit Plan Liabilities Noncurrent OtherPostretirementDefinedBenefitPlanLiabilitiesNoncurrent	12787000
CY2017	us-gaap	Defined Benefit Plan Contributions By Employer DefinedBenefitPlanContributionsByEmployer	30903000
CY2016	us-gaap	Defined Benefit Plan Contributions By Employer DefinedBenefitPlanContributionsByEmployer	44763000
CY2017Q4	mlm	Other Postretirement Defined Benefit Plan Liabilities Current OtherPostretirementDefinedBenefitPlanLiabilitiesCurrent	2560000
CY2016Q4	mlm	Other Postretirement Defined Benefit Plan Liabilities Current OtherPostretirementDefinedBenefitPlanLiabilitiesCurrent	3070000
CY2016Q4	us-gaap	Other Postretirement Defined Benefit Plan Liabilities Current And Noncurrent OtherPostretirementDefinedBenefitPlanLiabilitiesCurrentAndNoncurrent	20591000
CY2017Q4	us-gaap	Defined Benefit Plan Health Care Cost Trend Rate Assumed Next Fiscal Year DefinedBenefitPlanHealthCareCostTrendRateAssumedNextFiscalYear	0.070
CY2016Q4	us-gaap	Defined Benefit Plan Health Care Cost Trend Rate Assumed Next Fiscal Year DefinedBenefitPlanHealthCareCostTrendRateAssumedNextFiscalYear	0.070
CY2017Q4	us-gaap	Defined Benefit Plan Ultimate Health Care Cost Trend Rate1 DefinedBenefitPlanUltimateHealthCareCostTrendRate1	0.050
CY2016Q4	us-gaap	Defined Benefit Plan Ultimate Health Care Cost Trend Rate1 DefinedBenefitPlanUltimateHealthCareCostTrendRate1	0.050
CY2017	us-gaap	Defined Benefit Plan Year Health Care Cost Trend Rate Reaches Ultimate Trend Rate DefinedBenefitPlanYearHealthCareCostTrendRateReachesUltimateTrendRate	2022
CY2016	us-gaap	Defined Benefit Plan Year Health Care Cost Trend Rate Reaches Ultimate Trend Rate DefinedBenefitPlanYearHealthCareCostTrendRateReachesUltimateTrendRate	2021
CY2017	us-gaap	Defined Benefit Plan Effect Of One Percentage Point Increase On Service And Interest Cost Components DefinedBenefitPlanEffectOfOnePercentagePointIncreaseOnServiceAndInterestCostComponents	41000
CY2017	us-gaap	Defined Benefit Plan Effect Of One Percentage Point Increase On Accumulated Postretirement Benefit Obligation DefinedBenefitPlanEffectOfOnePercentagePointIncreaseOnAccumulatedPostretirementBenefitObligation	783000
CY2017	us-gaap	Defined Benefit Plan Effect Of One Percentage Point Decrease On Service And Interest Cost Components1 DefinedBenefitPlanEffectOfOnePercentagePointDecreaseOnServiceAndInterestCostComponents1	34000
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CY2017	us-gaap	Defined Contribution Plan Plan Name DefinedContributionPlanPlanName	401(a)
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CY2017	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures And Expirations In Period Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice	80.52
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CY2017Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice	83.37
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CY2017	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Weighted Average Remaining Contractual Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1	P3Y1M6D
CY2015	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Grants In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice	154.58
CY2017	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	13247000
CY2016	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	22571000
CY2015	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	7318000
CY2017Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue	39135000
CY2017Q4	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Intrinsic Value1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1	35984000
CY2017Q4	mlm	Common Stock Price CommonStockPrice	221.04
CY2017Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Available For Grant ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant	836000
CY2016	mlm	Share Based Compensation Arrangement By Share Based Payment Award Number Of Additional Shares Available For Grant ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfAdditionalSharesAvailableForGrant	800000
CY2017Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Authorized ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized	250000
CY2017	mlm	Cumulative Shares Issued Under Shareholder Value Achievement Plan CumulativeSharesIssuedUnderShareholderValueAchievementPlan	42025
CY2017Q4	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized	24866000
CY2017	mlm	Future Share Based Compensation Expense Year One FutureShareBasedCompensationExpenseYearOne	15559000
CY2017	mlm	Future Share Based Compensation Expense Year Two FutureShareBasedCompensationExpenseYearTwo	8299000
CY2017	mlm	Future Share Based Compensation Expense Year Three FutureShareBasedCompensationExpenseYearThree	645000
CY2017	mlm	Future Share Based Compensation Expense Year Four FutureShareBasedCompensationExpenseYearFour	269000
CY2016	us-gaap	Operating Leases Rent Expense Net OperatingLeasesRentExpenseNet	85945000
CY2017Q4	mlm	Percentage Ownership By Person Or Group Making Rights Exercisable PercentageOwnershipByPersonOrGroupMakingRightsExercisable	0.15
CY2017Q4	us-gaap	Class Of Warrant Or Right Exercise Price Of Warrants Or Rights1 ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1	315
CY2017	mlm	Asset Retirement Obligation Depreciation And Accretion AssetRetirementObligationDepreciationAndAccretion	8682000
CY2017Q4	us-gaap	Capital Leases Future Minimum Payments Due In Four Years CapitalLeasesFutureMinimumPaymentsDueInFourYears	1371000
CY2016	mlm	Asset Retirement Obligation Depreciation And Accretion AssetRetirementObligationDepreciationAndAccretion	8823000
CY2017Q4	us-gaap	Capital Leases Future Minimum Payments Due In Five Years CapitalLeasesFutureMinimumPaymentsDueInFiveYears	913000
CY2015	mlm	Asset Retirement Obligation Depreciation And Accretion AssetRetirementObligationDepreciationAndAccretion	6767000
CY2017Q4	us-gaap	Capital Leases Future Minimum Payments Due Thereafter CapitalLeasesFutureMinimumPaymentsDueThereafter	3993000
CY2017Q4	us-gaap	Capital Leases Future Minimum Payments Due In Three Years CapitalLeasesFutureMinimumPaymentsDueInThreeYears	2247000
CY2015	us-gaap	Operating Leases Rent Expense Net OperatingLeasesRentExpenseNet	80417000
CY2017	us-gaap	Royalty Expense RoyaltyExpense	51827000
CY2016	us-gaap	Royalty Expense RoyaltyExpense	55257000
CY2015	us-gaap	Royalty Expense RoyaltyExpense	53658000
CY2017Q4	us-gaap	Capital Leases Future Minimum Payments Due Current CapitalLeasesFutureMinimumPaymentsDueCurrent	4205000
CY2017Q4	us-gaap	Capital Leases Future Minimum Payments Due In Two Years CapitalLeasesFutureMinimumPaymentsDueInTwoYears	3750000
CY2017Q4	us-gaap	Capital Leases Future Minimum Payments Due CapitalLeasesFutureMinimumPaymentsDue	16479000
CY2017Q4	us-gaap	Capital Leases Future Minimum Payments Interest Included In Payments CapitalLeasesFutureMinimumPaymentsInterestIncludedInPayments	3231000
CY2017Q4	us-gaap	Capital Leases Future Minimum Payments Present Value Of Net Minimum Payments CapitalLeasesFutureMinimumPaymentsPresentValueOfNetMinimumPayments	13248000
CY2017Q4	us-gaap	Capital Lease Obligations Current CapitalLeaseObligationsCurrent	3623000
CY2017Q4	us-gaap	Capital Lease Obligations Noncurrent CapitalLeaseObligationsNoncurrent	9625000
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CY2017Q4	mlm	Future Minimum Lease Commitments Related To Contracts Of Affreightment FutureMinimumLeaseCommitmentsRelatedToContractsOfAffreightment	204418000
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CY2017	us-gaap	Asset Retirement Obligation Liabilities Incurred AssetRetirementObligationLiabilitiesIncurred	7940000
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CY2017	us-gaap	Asset Retirement Obligation Revision Of Estimate AssetRetirementObligationRevisionOfEstimate	-3852000
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CY2017Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	109653000
CY2017Q4	us-gaap	Accrued Insurance Noncurrent AccruedInsuranceNoncurrent	48061000
CY2016Q4	us-gaap	Accrued Insurance Noncurrent AccruedInsuranceNoncurrent	42184000
CY2017Q4	us-gaap	Letters Of Credit Outstanding Amount LettersOfCreditOutstandingAmount	45028000
CY2017Q4	mlm	Surety Bonds SuretyBonds	348253000
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CY2017	mlm	Group Of Bonds Amount GroupOfBondsAmount	5
CY2017Q4	mlm	Top5 Surety Bonds Percentage Top5SuretyBondsPercentage	0.26
CY2017Q4	us-gaap	Due From Affiliates DueFromAffiliates	15775000
CY2017Q4	us-gaap	Guarantee Obligations Maximum Exposure GuaranteeObligationsMaximumExposure	25000000
CY2016Q4	us-gaap	Unrecorded Unconditional Purchase Obligation Balance On First Anniversary UnrecordedUnconditionalPurchaseObligationBalanceOnFirstAnniversary	238280000
CY2016Q4	us-gaap	Unrecorded Unconditional Purchase Obligation Balance On Second Anniversary UnrecordedUnconditionalPurchaseObligationBalanceOnSecondAnniversary	37275000
CY2015	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	22285000
CY2015Q4	us-gaap	Assets Assets	6957611000
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CY2017	mlm	Percentage Of Employees Represented In Labor Union PercentageOfEmployeesRepresentedInLaborUnion	0.11
CY2017	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	61644000
CY2017	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	3
CY2016Q4	us-gaap	Unrecorded Unconditional Purchase Obligation Balance On Third Anniversary UnrecordedUnconditionalPurchaseObligationBalanceOnThirdAnniversary	10983000
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CY2016Q4	us-gaap	Unrecorded Unconditional Purchase Obligation Balance On Fifth Anniversary UnrecordedUnconditionalPurchaseObligationBalanceOnFifthAnniversary	1616000
CY2016Q4	us-gaap	Unrecorded Unconditional Purchase Obligation Due After Five Years UnrecordedUnconditionalPurchaseObligationDueAfterFiveYears	18502000
CY2016Q4	us-gaap	Unrecorded Unconditional Purchase Obligation Balance Sheet Amount UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount	315465000
CY2017	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	83748000
CY2016	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	62927000
CY2015	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	116681000
CY2017	us-gaap	Property Plant And Equipment Additions PropertyPlantAndEquipmentAdditions	438621000
CY2016	us-gaap	Property Plant And Equipment Additions PropertyPlantAndEquipmentAdditions	540771000
CY2015	us-gaap	Property Plant And Equipment Additions PropertyPlantAndEquipmentAdditions	364116000
CY2017	mlm	Property Plant And Equipment Additions Through Acquisitions PropertyPlantAndEquipmentAdditionsThroughAcquisitions	2480000
CY2016	mlm	Property Plant And Equipment Additions Through Acquisitions PropertyPlantAndEquipmentAdditionsThroughAcquisitions	133636000
CY2015	mlm	Property Plant And Equipment Additions Through Acquisitions PropertyPlantAndEquipmentAdditionsThroughAcquisitions	40350000
CY2016	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	-9171000
CY2015	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	3631000
CY2016	mlm	Increase Decrease In Accrued Salaries Benefits And Payroll Taxes IncreaseDecreaseInAccruedSalariesBenefitsAndPayrollTaxes	16942000
CY2015	mlm	Increase Decrease In Accrued Salaries Benefits And Payroll Taxes IncreaseDecreaseInAccruedSalariesBenefitsAndPayrollTaxes	-4854000
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CY2015	us-gaap	Increase Decrease In Accrued Income Taxes Payable IncreaseDecreaseInAccruedIncomeTaxesPayable	-4364000
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CY2015	us-gaap	Increase Decrease In Pension And Postretirement Obligations IncreaseDecreaseInPensionAndPostretirementObligations	-18153000
CY2017	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	38105000
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CY2017	us-gaap	Noncash Or Part Noncash Acquisition Other Assets Acquired1 NoncashOrPartNoncashAcquisitionOtherAssetsAcquired1	811000
CY2017	us-gaap	Noncash Or Part Noncash Acquisition Fixed Assets Acquired1 NoncashOrPartNoncashAcquisitionFixedAssetsAcquired1	2476000
CY2017	mlm	Sale Of Asset To Settle Liability SaleOfAssetToSettleLiability	900000
CY2017	us-gaap	Interest Paid InterestPaid	78902000
CY2016	us-gaap	Interest Paid InterestPaid	73664000
CY2017	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	155771000
CY2016	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	124342000
CY2017	us-gaap	Other Nonrecurring Expense OtherNonrecurringExpense	12668000

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2017 Q4 Form 10-K Financial Statement

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