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Share-Based Compensation - Schedule of Restricted Stock Units to be Settled in Cash (Detail) - shares | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract] |  |  |
Beginning balance of Outstanding, Restricted Stock Units to be Settled in Cash | 471,728 | 1,192,078 | 1,575,050
Restricted Stock Units to be Settled in Cash, Granted |  |  | 461,428
Restricted Stock Units to be Settled in Cash, Vested | (214,192) | (650,729) | (610,680)
Restricted Stock Units to be Settled in Cash, Forfeited | (44,742) | (69,621) | (233,720)
Ending balance of Outstanding, Restricted Stock Units to be Settled in Cash | 212,794 | 471,728 | 1,192,078

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 grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan) to be settled in cash. + References No definition available. + Details
Name: | ceco_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodSettledInCash
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