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Leases - Schedule of Future Minimum Sublease Rental Income under Operating Leases for Continuing and Discontinued Operations (Detail) $ in Thousands	Dec. 31, 2018 USD ($)
Property Subject to or Available for Operating Lease [Line Items]
Operating Subleases, 2019	$ 3,631
Operating Subleases, 2020	2,750
Operating Subleases, 2021	1,279
Operating Subleases, 2022	777
Operating Subleases, 2023 and thereafter	328
Operating Subleases, Total	8,765
Continuing Operation [Member]
Property Subject to or Available for Operating Lease [Line Items]
Operating Subleases, 2019	3,457
Operating Subleases, 2020	2,750
Operating Subleases, 2021	1,279
Operating Subleases, 2022	777
Operating Subleases, 2023 and thereafter	328
Operating Subleases, Total	8,591
Discontinued Operations [Member]
Property Subject to or Available for Operating Lease [Line Items]
Operating Subleases, 2019	174
Operating Subleases, Total	$ 174

X

- Definition

Amount of minimum sublease rentals to be received by the seller-lessee for all operating leases.

+ References

No definition available.

+ Details

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Namespace Prefix:	ceco_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of minimum sublease rentals to be received by the seller-lessee in and after the fifth fiscal year.

+ References

No definition available.

+ Details

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Namespace Prefix:	ceco_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of minimum sublease rentals to be received by the seller-lessee in the next four fiscal years.

+ References

No definition available.

+ Details

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Namespace Prefix:	ceco_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of minimum sublease rentals to be received by the seller-lessee in the next fiscal year.

+ References

No definition available.

+ Details

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Namespace Prefix:	ceco_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of minimum sublease rentals to be received by the seller-lessee in the next three fiscal years.

+ References

No definition available.

+ Details

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Namespace Prefix:	ceco_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of minimum sublease rentals to be received by the seller-lessee in the next two fiscal years.

+ References

No definition available.

+ Details

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Namespace Prefix:	ceco_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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

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

X

- Details

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X

- Details

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