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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Narrative) (Details) (USD $)
Share data in Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2015
Accounting Policies [Line Items]      
Restructuring charges $ 2,818,000us-gaap_RestructuringAndRelatedCostIncurredCost $ 0us-gaap_RestructuringAndRelatedCostIncurredCost  
Antidilutive weighted-average common stock equivalents 1,711vmc_SharesExcludedFromDilutedWeightedAverageCommonSharesOutstandingComputationDueToOperatingLosses    
Scenario, Forecast [Member]      
Accounting Policies [Line Items]      
Restructuring charges, expected costs remaining     $ 3,000,000us-gaap_RestructuringAndRelatedCostExpectedCostRemaining1
/ us-gaap_StatementScenarioAxis
= us-gaap_ScenarioForecastMember