XML 16 R39.htm IDEA: XBRL DOCUMENT
v2.4.0.8

Basis of Presentation (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2013 Segment Production_Facility | Dec. 31, 2012
Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |
Number of production facilities operated | 4 |
Number of reportable segments | 1 |
Pre-tax net loss generated by Warsaw, Kentucky facility operations |  | $ 1,100,000

X
- Definition Number of Production Facilities Operated + References No definition available. + Details
Name: | cmt_NumberOfProductionFacilitiesOperated
Namespace Prefix: | cmt_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Pre-tax net loss generated by Warsaw, Kentucky facility operations. + References No definition available. + Details
Name: | cmt_PreTaxNetLossGeneratedByWarsawKentuckyFacilityOperations
Namespace Prefix: | cmt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. + References No definition available. + Details
Name: | us-gaap_NumberOfReportableSegments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_OrganizationConsolidationAndPresentationOfFinancialStatementsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration