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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Weighted-Average Common Shares Outstanding) (Details)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Weighted Average Number Of Shares Outstanding      
Weighted-average common shares outstanding 131,461us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 130,272us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 129,745us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Dilutive effect of      
Stock options/SOSARs 656us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements 461us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements 0us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Other stock compensation plans 874vmc_IncrementalCommonSharesAttributableToOtherStockCompensationPlans 734vmc_IncrementalCommonSharesAttributableToOtherStockCompensationPlans 0vmc_IncrementalCommonSharesAttributableToOtherStockCompensationPlans
Weighted-average common shares outstanding, assuming dilution 132,991us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 131,467us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 129,745us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding