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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Weighted-Average Common Shares Outstanding) (Details)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Weighted Average Number Of Shares Outstanding    
Weighted-average common shares outstanding 132,659us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 130,810us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Dilutive effect of    
Stock options/SOSARs 0us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements 693us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Other stock compensation plans 0vmc_IncrementalCommonSharesAttributableToOtherStockCompensationPlans 811vmc_IncrementalCommonSharesAttributableToOtherStockCompensationPlans
Weighted-average common shares outstanding, assuming dilution 132,659us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 132,314us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding