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Share-Based Compensation - Schedule of Restricted Stock Units to be Settled in Cash (Detail) shares in Thousands | 9 Months Ended
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Sep. 30, 2018 shares
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |
Beginning balance of Outstanding, Restricted Stock Units to be Settled in Cash | 472
Restricted Stock Units to be Settled in Cash, Vested | (210)
Restricted Stock Units to be Settled in Cash, Forfeited | (45)
Ending balance of Outstanding, Restricted Stock Units to be Settled in Cash | 217

X
- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period for equity-based payment instruments to be settled in cash. + References No definition available. + Details
Name: | ceco_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedSettledInCash
Namespace Prefix: | ceco_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of non-vested equity-based payment instruments which are to be settled in cash, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + References No definition available. + Details
Name: | ceco_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonVestedNumberSettledInCash
Namespace Prefix: | ceco_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period for equity-based payment instruments to be settled in cash. + References No definition available. + Details
Name: | ceco_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedSettledInCash
Namespace Prefix: | ceco_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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