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Consolidated Balance Sheets (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Mar. 31, 2014
Current Assets:      
Cash and cash equivalents $ 56,366us-gaap_CashAndCashEquivalentsAtCarryingValue $ 108,651us-gaap_CashAndCashEquivalentsAtCarryingValue $ 35,801us-gaap_CashAndCashEquivalentsAtCarryingValue
Accounts receivable, net 381,389us-gaap_AccountsReceivableNetCurrent 421,001us-gaap_AccountsReceivableNetCurrent 242,587us-gaap_AccountsReceivableNetCurrent
Inventories, net 505,047us-gaap_InventoryNet 484,919us-gaap_InventoryNet 354,718us-gaap_InventoryNet
Current deferred income tax benefits 235,367us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent 244,638us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent 73,320us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent
Other current assets 103,560us-gaap_OtherAssetsCurrent 29,607us-gaap_OtherAssetsCurrent 51,788us-gaap_OtherAssetsCurrent
Total Current Assets 1,281,729us-gaap_AssetsCurrent 1,288,816us-gaap_AssetsCurrent 758,214us-gaap_AssetsCurrent
Property, plant and equipment 5,694,546us-gaap_PropertyPlantAndEquipmentGross 5,691,676us-gaap_PropertyPlantAndEquipmentGross 4,001,505us-gaap_PropertyPlantAndEquipmentGross
Allowances for depreciation, depletion and amortization (2,329,440)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment (2,288,906)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment (2,207,969)us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Net property, plant and equipment 3,365,106us-gaap_PropertyPlantAndEquipmentNet 3,402,770us-gaap_PropertyPlantAndEquipmentNet 1,793,536us-gaap_PropertyPlantAndEquipmentNet
Goodwill 2,071,471us-gaap_Goodwill 2,068,799us-gaap_Goodwill 616,621us-gaap_Goodwill
Other noncurrent assets 107,386us-gaap_OtherAssetsNoncurrent 108,802us-gaap_OtherAssetsNoncurrent 39,143us-gaap_OtherAssetsNoncurrent
Total Assets 7,417,646us-gaap_Assets 7,464,392us-gaap_Assets 3,255,257us-gaap_Assets
Current Liabilities:      
Bank overdraft   183us-gaap_BankOverdrafts  
Accounts payable 184,066us-gaap_AccountsPayableCurrent 202,476us-gaap_AccountsPayableCurrent 98,775us-gaap_AccountsPayableCurrent
Accrued salaries, benefits and payroll taxes 23,590us-gaap_EmployeeRelatedLiabilitiesCurrent 36,576us-gaap_EmployeeRelatedLiabilitiesCurrent 12,904us-gaap_EmployeeRelatedLiabilitiesCurrent
Pension and postretirement benefits 6,637us-gaap_PensionAndOtherPostretirementAndPostemploymentBenefitPlansLiabilitiesCurrent 6,953us-gaap_PensionAndOtherPostretirementAndPostemploymentBenefitPlansLiabilitiesCurrent 2,356us-gaap_PensionAndOtherPostretirementAndPostemploymentBenefitPlansLiabilitiesCurrent
Accrued insurance and other taxes 58,742us-gaap_AccrualForTaxesOtherThanIncomeTaxesCurrent 58,356us-gaap_AccrualForTaxesOtherThanIncomeTaxesCurrent 27,265us-gaap_AccrualForTaxesOtherThanIncomeTaxesCurrent
Current maturities of long-term debt and short-term facilities 14,406us-gaap_DebtCurrent 14,336us-gaap_DebtCurrent 12,403us-gaap_DebtCurrent
Accrued interest 22,461us-gaap_InterestPayableCurrent 16,136us-gaap_InterestPayableCurrent 18,077us-gaap_InterestPayableCurrent
Other current liabilities 33,653us-gaap_OtherLiabilitiesCurrent 61,632us-gaap_OtherLiabilitiesCurrent 21,978us-gaap_OtherLiabilitiesCurrent
Total Current Liabilities 343,555us-gaap_LiabilitiesCurrent 396,648us-gaap_LiabilitiesCurrent 193,758us-gaap_LiabilitiesCurrent
Long-term debt 1,566,617us-gaap_LongTermDebtNoncurrent 1,571,059us-gaap_LongTermDebtNoncurrent 1,055,541us-gaap_LongTermDebtNoncurrent
Pension, postretirement and postemployment benefits 252,923us-gaap_PensionAndOtherPostretirementAndPostemploymentBenefitPlansLiabilitiesNoncurrent 249,333us-gaap_PensionAndOtherPostretirementAndPostemploymentBenefitPlansLiabilitiesNoncurrent 80,457us-gaap_PensionAndOtherPostretirementAndPostemploymentBenefitPlansLiabilitiesNoncurrent
Noncurrent deferred income taxes 753,727us-gaap_DeferredTaxLiabilitiesNoncurrent 734,583us-gaap_DeferredTaxLiabilitiesNoncurrent 272,346us-gaap_DeferredTaxLiabilitiesNoncurrent
Other noncurrent liabilities 158,641us-gaap_OtherLiabilitiesNoncurrent 160,021us-gaap_OtherLiabilitiesNoncurrent 108,862us-gaap_OtherLiabilitiesNoncurrent
Total Liabilities 3,075,463us-gaap_Liabilities 3,111,644us-gaap_Liabilities 1,710,964us-gaap_Liabilities
Equity:      
Common stock, par value $0.01 per share 673us-gaap_CommonStockValue 671us-gaap_CommonStockValue 462us-gaap_CommonStockValue
Preferred stock, par value $0.01 per share         
Additional paid-in capital 3,255,809us-gaap_AdditionalPaidInCapitalCommonStock 3,243,619us-gaap_AdditionalPaidInCapitalCommonStock 442,551us-gaap_AdditionalPaidInCapitalCommonStock
Accumulated other comprehensive loss (106,723)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax (106,159)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax (42,744)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Retained earnings 1,190,807us-gaap_RetainedEarningsAccumulatedDeficit 1,213,035us-gaap_RetainedEarningsAccumulatedDeficit 1,108,516us-gaap_RetainedEarningsAccumulatedDeficit
Total Shareholders' Equity 4,340,566us-gaap_StockholdersEquity 4,351,166us-gaap_StockholdersEquity 1,508,785us-gaap_StockholdersEquity
Noncontrolling interests 1,617us-gaap_MinorityInterest 1,582us-gaap_MinorityInterest 35,508us-gaap_MinorityInterest
Total Equity 4,342,183us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest 4,352,748us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest 1,544,293us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
Total Liabilities and Equity 7,417,646us-gaap_LiabilitiesAndStockholdersEquity 7,464,392us-gaap_LiabilitiesAndStockholdersEquity 3,255,257us-gaap_LiabilitiesAndStockholdersEquity
Operating Permits      
Current Assets:      
Intangibles, net 497,841us-gaap_IntangibleAssetsNetExcludingGoodwill
/ mlm_IntangibleAssetsByMajorClassAxis
= mlm_OperatingPermitsMember
499,487us-gaap_IntangibleAssetsNetExcludingGoodwill
/ mlm_IntangibleAssetsByMajorClassAxis
= mlm_OperatingPermitsMember
16,935us-gaap_IntangibleAssetsNetExcludingGoodwill
/ mlm_IntangibleAssetsByMajorClassAxis
= mlm_OperatingPermitsMember
Other Intangible Assets      
Current Assets:      
Intangibles, net $ 94,113us-gaap_IntangibleAssetsNetExcludingGoodwill
/ mlm_IntangibleAssetsByMajorClassAxis
= us-gaap_OtherIntangibleAssetsMember
$ 95,718us-gaap_IntangibleAssetsNetExcludingGoodwill
/ mlm_IntangibleAssetsByMajorClassAxis
= us-gaap_OtherIntangibleAssetsMember
$ 30,808us-gaap_IntangibleAssetsNetExcludingGoodwill
/ mlm_IntangibleAssetsByMajorClassAxis
= us-gaap_OtherIntangibleAssetsMember