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Basis of Presentation (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Segment
Production_Facility
Dec. 31, 2012
Organization, Consolidation and Presentation of Financial Statements [Abstract]    
Number of production facilities operated 4cmt_NumberOfProductionFacilitiesOperated  
Number of reportable segments 1us-gaap_NumberOfReportableSegments  
Pre-tax net loss generated by Warsaw, Kentucky facility operations   $ 1,100,000cmt_PreTaxNetLossGeneratedByWarsawKentuckyFacilityOperations