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Restructuring Charges - Additional Information (Detail) $ in Millions	3 Months Ended
	Mar. 31, 2018 USD ($) Cmp	Dec. 31, 2017 USD ($)
Restructuring And Related Activities [Abstract]
Accrual for severance and related charges	$ 1.2	$ 2.1
Accrued retention bonuses	$ 0.4
Number of remaining teach-out campuses | Cmp	6
Charges related to remaining obligations for continuing operations	$ 68.2
Gross remaining lease obligations	$ 3.0

X

- Definition

Number of remaining teach-out campuses.

+ References

No definition available.

+ Details

Name:	ceco_NumberOfRemainingTeachOutCampuses
Namespace Prefix:	ceco_
Data Type:	xbrli:positiveIntegerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The present value of the estimated charge related to remaining lease obligations for lease exits offset with an estimated amount for sublease income.

+ References

No definition available.

+ Details

Name:	ceco_PresentValueOfRemainingLeaseObligation
Namespace Prefix:	ceco_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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