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Discontinued Operations - Summary Results of Operations for Discontinued Operations (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified	0 Months Ended	12 Months Ended
	Dec. 03, 2013	Dec. 31, 2014
Discontinued Operations and Disposal Groups [Abstract]
Income tax expense	$ 87.9ceco_DiscontinuedOperationsIncomeTaxExpenseAttributedToSaleOfInternationalOperations	$ 87.9ceco_DiscontinuedOperationsIncomeTaxExpenseAttributedToSaleOfInternationalOperations

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- Definition

Income tax expense recorded due to the sale of International operations, including the tax effect of the difference in basis for financial reporting purposes versus tax reporting.

+ References

No definition available.

+ Details

Name:	ceco_DiscontinuedOperationsIncomeTaxExpenseAttributedToSaleOfInternationalOperations
Namespace Prefix:	ceco_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

Name:	us-gaap_DiscontinuedOperationsAndDisposalGroupsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration