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Property, Plant and Equipment, Net - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Property Plant And Equipment [Line Items]      
Capitalized interest cost $ 8,033us-gaap_InterestCostsCapitalized $ 1,792us-gaap_InterestCostsCapitalized $ 2,537us-gaap_InterestCostsCapitalized
Property, plant and equipment, net 3,402,770us-gaap_PropertyPlantAndEquipmentNet 1,799,241us-gaap_PropertyPlantAndEquipmentNet  
Bahamas And Canada      
Property Plant And Equipment [Line Items]      
Property, plant and equipment, net 68,340us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementGeographicalAxis
= mlm_BahamasAndCanadaMember		 62,826us-gaap_PropertyPlantAndEquipmentNet
/ us-gaap_StatementGeographicalAxis
= mlm_BahamasAndCanadaMember		  
Property Plant and Equipment      
Property Plant And Equipment [Line Items]      
Depreciation, depletion and amortization $ 211,242mlm_DepreciationAndDepletionAndAmortizationExcludingPortionAttributableToMachineryAndEquipmentUnderCapitalLeases
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_PropertyPlantAndEquipmentMember		 $ 168,333mlm_DepreciationAndDepletionAndAmortizationExcludingPortionAttributableToMachineryAndEquipmentUnderCapitalLeases
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_PropertyPlantAndEquipmentMember		 $ 171,940mlm_DepreciationAndDepletionAndAmortizationExcludingPortionAttributableToMachineryAndEquipmentUnderCapitalLeases
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_PropertyPlantAndEquipmentMember