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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

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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.

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No definition available.

+ Details

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

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- Definition

The amount of severance related costs expected to be paid in the next fiscal year related to restructuring actions.

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No definition available.

+ Details

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

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- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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