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Components of Change in Other Assets and Liabilities Net (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Supplemental Cash Flow Elements [Abstract]    
Other current and noncurrent assets $ (4,083)us-gaap_IncreaseDecreaseInOtherOperatingAssets $ (783)us-gaap_IncreaseDecreaseInOtherOperatingAssets
Accrued salaries, benefits and payroll taxes (13,703)us-gaap_IncreaseDecreaseInOtherEmployeeRelatedLiabilities (3,984)us-gaap_IncreaseDecreaseInOtherEmployeeRelatedLiabilities
Accrued insurance and other taxes 386mlm_IncreaseDecreaseInAccruedInsuranceAndOtherTaxes (1,838)mlm_IncreaseDecreaseInAccruedInsuranceAndOtherTaxes
Accrued income taxes (46,700)us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable (4,595)us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable
Accrued pension, postretirement and postemployment benefits 5,830us-gaap_IncreaseDecreaseInPensionAndPostretirementObligations 2,763us-gaap_IncreaseDecreaseInPensionAndPostretirementObligations
Other current and noncurrent liabilities (10,827)us-gaap_IncreaseDecreaseInOtherOperatingLiabilities 9,311us-gaap_IncreaseDecreaseInOtherOperatingLiabilities
Change in other assets and liabilities $ (69,097)us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet $ 874us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet