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Discontinued Operations - Summary Results of Operations Held for Sale within Discontinued Operations (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Asset Held For Sale: |  |  |
Revenue | $ 172,606 ceco_RevenueFromDisposalGroupIncludingDiscontinuedOperationsHeldForSale | $ 177,549 ceco_RevenueFromDisposalGroupIncludingDiscontinuedOperationsHeldForSale | $ 224,842 ceco_RevenueFromDisposalGroupIncludingDiscontinuedOperationsHeldForSale
Loss from discontinued operations | $ (66,322)ceco_LossIncomeFromDisposalGroupIncludingDiscontinuedOperationsHeldForSale | $ (81,242)ceco_LossIncomeFromDisposalGroupIncludingDiscontinuedOperationsHeldForSale | $ (33,865)ceco_LossIncomeFromDisposalGroupIncludingDiscontinuedOperationsHeldForSale

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- Details
Name: | ceco_AssetsHeldForSaleAbstract
Namespace Prefix: | ceco_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The amount of loss income from discontinued operations related to assets held for sale. + References No definition available. + Details
Name: | ceco_LossIncomeFromDisposalGroupIncludingDiscontinuedOperationsHeldForSale
Namespace Prefix: | ceco_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition The amount of revenue recorded for the period relating to assets held for sale within discontinued operations. + References No definition available. + Details
Name: | ceco_RevenueFromDisposalGroupIncludingDiscontinuedOperationsHeldForSale
Namespace Prefix: | ceco_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration