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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Cash Flows from Operating Activities:      
Consolidated Net Earnings $ 154,294us-gaap_ProfitLoss $ 119,432us-gaap_ProfitLoss $ 85,527us-gaap_ProfitLoss
Adjustments to reconcile consolidated net earnings to net cash provided by operating activities:      
Depreciation, depletion and amortization 222,746us-gaap_DepreciationDepletionAndAmortization 173,761us-gaap_DepreciationDepletionAndAmortization 177,211us-gaap_DepreciationDepletionAndAmortization
Stock-based compensation expense 8,993us-gaap_ShareBasedCompensation 7,008us-gaap_ShareBasedCompensation 7,781us-gaap_ShareBasedCompensation
Gains on divestitures and sales of assets (52,297)us-gaap_GainLossOnDispositionOfAssets (2,265)us-gaap_GainLossOnDispositionOfAssets (956)us-gaap_GainLossOnDispositionOfAssets
Deferred income taxes 50,292us-gaap_DeferredIncomeTaxExpenseBenefit 24,113us-gaap_DeferredIncomeTaxExpenseBenefit 13,929us-gaap_DeferredIncomeTaxExpenseBenefit
Excess tax benefits from stock-based compensation transactions (2,508)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities (2,368)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities (777)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities
Other items, net 4,795us-gaap_OtherNoncashIncomeExpense (429)us-gaap_OtherNoncashIncomeExpense 2,073us-gaap_OtherNoncashIncomeExpense
Changes in operating assets and liabilities, net of effects of acquisitions and divestitures:      
Accounts receivable, net (16,650)us-gaap_IncreaseDecreaseInAccountsReceivable (22,523)us-gaap_IncreaseDecreaseInAccountsReceivable (20,302)us-gaap_IncreaseDecreaseInAccountsReceivable
Inventories, net (12,020)us-gaap_IncreaseDecreaseInInventories (11,639)us-gaap_IncreaseDecreaseInInventories (9,640)us-gaap_IncreaseDecreaseInInventories
Accounts payable 5,303us-gaap_IncreaseDecreaseInAccountsPayableTrade 20,063us-gaap_IncreaseDecreaseInAccountsPayableTrade (8,673)us-gaap_IncreaseDecreaseInAccountsPayableTrade
Other assets and liabilities, net 18,710us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet 3,798us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet (23,484)us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet
Net Cash Provided by Operating Activities 381,658us-gaap_NetCashProvidedByUsedInOperatingActivities 308,951us-gaap_NetCashProvidedByUsedInOperatingActivities 222,689us-gaap_NetCashProvidedByUsedInOperatingActivities
Cash Flows from Investing Activities:      
Additions to property, plant and equipment (232,183)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (155,233)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (151,023)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Acquisitions, net (189)us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired (64,478)us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired (160)us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
Cash received in acquisition 59,887us-gaap_CashAcquiredFromAcquisition    
Proceeds from divestitures and sales of assets 121,985us-gaap_ProceedsFromSalesOfBusinessAffiliateAndProductiveAssets 8,564us-gaap_ProceedsFromSalesOfBusinessAffiliateAndProductiveAssets 9,973us-gaap_ProceedsFromSalesOfBusinessAffiliateAndProductiveAssets
Payment of railcar construction advances (14,513)mlm_PaymentsForOtherInvestingActivities    
Reimbursement of railcar construction advances 14,513mlm_ProceedsFromOtherInvestingActivities    
Repayments from affiliate 1,175us-gaap_ProceedsFromCollectionOfAdvanceToAffiliate    
Loan to affiliate   (3,402)us-gaap_PaymentsForAdvanceToAffiliate (2,000)us-gaap_PaymentsForAdvanceToAffiliate
Net Cash Used for Investing Activities (49,325)us-gaap_NetCashProvidedByUsedInInvestingActivities (214,549)us-gaap_NetCashProvidedByUsedInInvestingActivities (143,210)us-gaap_NetCashProvidedByUsedInInvestingActivities
Cash Flows from Financing Activities:      
Borrowings of long-term debt 868,762us-gaap_ProceedsFromIssuanceOfLongTermDebt 604,417us-gaap_ProceedsFromIssuanceOfLongTermDebt 181,000us-gaap_ProceedsFromIssuanceOfLongTermDebt
Repayments of long-term debt (1,057,289)us-gaap_RepaymentsOfLongTermDebt (621,142)us-gaap_RepaymentsOfLongTermDebt (193,655)us-gaap_RepaymentsOfLongTermDebt
Debt issuance costs (2,782)us-gaap_PaymentsOfDebtIssuanceCosts (2,148)us-gaap_PaymentsOfDebtIssuanceCosts (621)us-gaap_PaymentsOfDebtIssuanceCosts
Change in bank overdraft (2,373)us-gaap_ProceedsFromRepaymentsOfBankOverdrafts 2,556us-gaap_ProceedsFromRepaymentsOfBankOverdrafts  
Payments on capital lease obligations (3,075)us-gaap_RepaymentsOfLongTermCapitalLeaseObligations (28)us-gaap_RepaymentsOfLongTermCapitalLeaseObligations  
Dividends paid (91,304)us-gaap_PaymentsOfDividendsCommonStock (74,197)us-gaap_PaymentsOfDividendsCommonStock (73,767)us-gaap_PaymentsOfDividendsCommonStock
Distributions to owners of noncontrolling interests (800)us-gaap_PaymentsOfDividendsMinorityInterest (876)us-gaap_PaymentsOfDividendsMinorityInterest (800)us-gaap_PaymentsOfDividendsMinorityInterest
Purchase of remaining interest in existing subsidiaries (19,480)us-gaap_PaymentsToAcquireAdditionalInterestInSubsidiaries    
Issuances of common stock 39,714us-gaap_ProceedsFromIssuanceOfCommonStock 11,691us-gaap_ProceedsFromIssuanceOfCommonStock 6,959us-gaap_ProceedsFromIssuanceOfCommonStock
Excess tax benefits from stock-based compensation transactions 2,508us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities 2,368us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities 777us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
Net Cash Used for Financing Activities (266,119)us-gaap_NetCashProvidedByUsedInFinancingActivities (77,359)us-gaap_NetCashProvidedByUsedInFinancingActivities (80,107)us-gaap_NetCashProvidedByUsedInFinancingActivities
Net Increase (Decrease) in Cash and Cash Equivalents 66,214us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease 17,043us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease (628)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and Cash Equivalents, beginning of year 42,437us-gaap_CashAndCashEquivalentsAtCarryingValue 25,394us-gaap_CashAndCashEquivalentsAtCarryingValue 26,022us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and Cash Equivalents, end of year 108,651us-gaap_CashAndCashEquivalentsAtCarryingValue 42,437us-gaap_CashAndCashEquivalentsAtCarryingValue 25,394us-gaap_CashAndCashEquivalentsAtCarryingValue
Supplemental Disclosures of Cash Flow Information:      
Cash paid for interest 81,304us-gaap_InterestPaid 52,034us-gaap_InterestPaid 53,039us-gaap_InterestPaid
Cash paid for income taxes $ 15,955us-gaap_IncomeTaxesPaidNet $ 23,491us-gaap_IncomeTaxesPaidNet $ 12,826us-gaap_IncomeTaxesPaidNet