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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
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Dec. 03, 2013 | Dec. 31, 2014
Discontinued Operations and Disposal Groups [Abstract] |  |
Income tax expense | $ 87.9 ceco_DiscontinuedOperationsIncomeTaxExpenseAttributedToSaleOfInternationalOperations | $ 87.9 ceco_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

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