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Consolidated Statement of Stockholders' Equity (Parenthetical) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Statement of Stockholders' Equity [Abstract]
Tax effect of change in post retirement benefits	$ 1,119,000us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansTaxPortionAttributableToParent	$ (961,000)us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansTaxPortionAttributableToParent	$ 384,000us-gaap_OtherComprehensiveIncomeDefinedBenefitPlansTaxPortionAttributableToParent
Tax effect of change in interest rate swaps	$ 7,000cmt_OtherComprehensiveIncomeDerivativeInstrumentsTax	$ 12,000cmt_OtherComprehensiveIncomeDerivativeInstrumentsTax	$ 28,000cmt_OtherComprehensiveIncomeDerivativeInstrumentsTax

X

- Definition

Other Comprehensive Income, Derivative Instruments, Tax

+ References

No definition available.

+ Details

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X

- Definition

Amount of tax (expense) benefit, after reclassification adjustments, of (increase) decrease in accumulated other comprehensive (income) loss related to pension and other postretirement defined benefit plans, attributable to parent entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 810

-SubTopic 10

-Section 45

-Paragraph 20

-URI http://asc.fasb.org/extlink&oid=7656940&loc=SL4569643-111683



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 810

-SubTopic 10

-Section 45

-Paragraph 19

-URI http://asc.fasb.org/extlink&oid=7656940&loc=SL4569616-111683



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 810

-SubTopic 10

-Section 50

-Paragraph 1A

-Subparagraph (c)(3)

-URI http://asc.fasb.org/extlink&oid=18733093&loc=SL4573702-111684

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