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Foreign Operations (Details) (USD $)	3 Months Ended												12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Foreign operations:
Total sales	$ 44,414,000us-gaap_SalesRevenueNet	$ 43,591,000us-gaap_SalesRevenueNet	$ 46,124,000us-gaap_SalesRevenueNet	$ 41,075,000us-gaap_SalesRevenueNet	$ 37,648,000us-gaap_SalesRevenueNet	$ 37,434,000us-gaap_SalesRevenueNet	$ 34,681,000us-gaap_SalesRevenueNet	$ 34,362,000us-gaap_SalesRevenueNet	$ 35,696,000us-gaap_SalesRevenueNet	$ 37,681,000us-gaap_SalesRevenueNet	$ 44,544,000us-gaap_SalesRevenueNet	$ 44,529,000us-gaap_SalesRevenueNet	$ 175,204,000us-gaap_SalesRevenueNet	$ 144,125,000us-gaap_SalesRevenueNet	$ 162,450,000us-gaap_SalesRevenueNet
Property, plant and equipment — net	61,995,000us-gaap_PropertyPlantAndEquipmentNet				56,478,000us-gaap_PropertyPlantAndEquipmentNet								61,995,000us-gaap_PropertyPlantAndEquipmentNet	56,478,000us-gaap_PropertyPlantAndEquipmentNet
United States
Foreign operations:
Total sales													123,317,000us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_US	95,063,000us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_US	115,226,000us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_US
Property, plant and equipment — net	31,674,000us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_US				24,285,000us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_US								31,674,000us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_US	24,285,000us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_US
Mexico
Foreign operations:
Total sales													47,772,000us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_MX	45,069,000us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_MX	43,358,000us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_MX
Property, plant and equipment — net	30,321,000us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_MX				32,193,000us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_MX								30,321,000us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_MX	32,193,000us-gaap_PropertyPlantAndEquipmentNet / us-gaap_StatementGeographicalAxis = country_MX
Canada
Foreign operations:
Total sales													4,115,000us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_CA	3,993,000us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_CA	3,866,000us-gaap_SalesRevenueNet / us-gaap_StatementGeographicalAxis = country_CA
CoreComposites de Mexico, S. de R.L. de C.V.
Foreign operations:
Sales													$ 61,313,000us-gaap_SalesRevenueGoodsGross / dei_LegalEntityAxis = cmt_CorecompositesDeMexicoSDeRLDeCVMember	$ 61,612,000us-gaap_SalesRevenueGoodsGross / dei_LegalEntityAxis = cmt_CorecompositesDeMexicoSDeRLDeCVMember	$ 74,667,000us-gaap_SalesRevenueGoodsGross / dei_LegalEntityAxis = cmt_CorecompositesDeMexicoSDeRLDeCVMember
Expenses as a percentage of revenues													22.00%cmt_ExpensesIncurredInPesosAsPercentOfSales / dei_LegalEntityAxis = cmt_CorecompositesDeMexicoSDeRLDeCVMember	23.00%cmt_ExpensesIncurredInPesosAsPercentOfSales / dei_LegalEntityAxis = cmt_CorecompositesDeMexicoSDeRLDeCVMember	20.00%cmt_ExpensesIncurredInPesosAsPercentOfSales / dei_LegalEntityAxis = cmt_CorecompositesDeMexicoSDeRLDeCVMember

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