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Restructuring Charges - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended	36 Months Ended
	Dec. 31, 2017	Dec. 31, 2017	Dec. 31, 2016
Restructuring Cost And Reserve [Line Items]
Accrual for severance and related charges	$ 2.1	$ 2.1	$ 7.3
Long term amount			$ 1.4
Accrued retention bonuses	$ 0.5	0.5
Lease expiration teach out campuses	2022
Gross remaining lease obligations	$ 3.0	3.0
Charges related to remaining obligations for continuing operations		67.7
Maximum [Member]
Restructuring Cost And Reserve [Line Items]
Long term amount	$ 0.1	$ 0.1

X

- Definition

The longest lease term expiration for all campuses that are scheduled to be taught out as of the reporting date.

+ References

No definition available.

+ Details

Name:	ceco_LeaseExpirationTeachOutCampuses
Namespace Prefix:	ceco_
Data Type:	xbrli:gYearItemType
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 greater than one year from the reporting date related to restructuring actions.

+ References

No definition available.

+ Details

Name:	ceco_SeveranceAccrualLongTermPortion
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

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_RestructuringCostAndReserveLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type: