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Restructuring Charges - Additional Information (Detail) - USD ($) $ in Millions | 42 Months Ended |
--- | --- | ---
Jun. 30, 2018 | Dec. 31, 2017
Restructuring And Related Activities [Abstract] |  |
Accrual for severance and related charges | $ 0.7 | $ 2.1
Accrued retention bonuses | 0.3 |
Charges related to remaining obligations for continuing operations | $ 73.3 |

X
- Definition For continuing operations and discontinuing operations under restructuring activities, the present value of remaining lease obligations recorded at the time a facility is exited. + References No definition available. + Details
Name: | ceco_RemainingLeaseObligationsRestructuringIncurred
Namespace Prefix: | ceco_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The amount of retention bonus accrued for as of the balance sheet date as part of restructuring actions that is due to paid within one year of the balance sheet date. + References No definition available. + Details
Name: | ceco_RetentionBonusesAccruedInAssociationWithRestructuring
Namespace Prefix: | ceco_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount of severance related costs expected to be paid in the next fiscal year related to restructuring actions. + References No definition available. + Details
Name: | ceco_SeveranceAccrualShortTermPortionRestructuring
Namespace Prefix: | ceco_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_RestructuringAndRelatedActivitiesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration