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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Estimated Payments Undiscounted Under Our Self Insurance Program) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES [Abstract]  
2015 $ 18,585vmc_EstimatedPaymentsUnderSelfInsuranceProgramYearOne
2016 11,210vmc_EstimatedPaymentsUnderSelfInsuranceProgramYearTwo
2017 7,704vmc_EstimatedPaymentsUnderSelfInsuranceProgramYearThree
2018 5,347vmc_EstimatedPaymentsUnderSelfInsuranceProgramYearFour
2019 $ 3,835vmc_EstimatedPaymentsUnderSelfInsuranceProgramYearFive