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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, 2017 USD ($)
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Property Subject to or Available for Operating Lease [Line Items] |
Operating Subleases, 2018 | $ 5,928
Operating Subleases, 2019 | 4,140
Operating Subleases, 2020 | 2,637
Operating Subleases, 2021 | 784
Operating Subleases, Total | 13,489
Continuing Operation [Member] |
Property Subject to or Available for Operating Lease [Line Items] |
Operating Subleases, 2018 | 4,344
Operating Subleases, 2019 | 3,797
Operating Subleases, 2020 | 2,637
Operating Subleases, 2021 | 784
Operating Subleases, Total | 11,562
Discontinued Operations [Member] |
Property Subject to or Available for Operating Lease [Line Items] |
Operating Subleases, 2018 | 1,584
Operating Subleases, 2019 | 343
Operating Subleases, Total | $ 1,927

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- Definition Amount of minimum sublease rentals to be received by the seller-lessee for all operating leases. + References No definition available. + Details
Name: | ceco_FutureMinimumSubleaseRentalsUnderOperatingLeases
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
Name: | ceco_FutureMinimumSubleaseRentalsUnderOperatingLeasesWithinFourYears
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
Name: | ceco_FutureMinimumSubleaseRentalsUnderOperatingLeasesWithinOneYear
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
Name: | ceco_FutureMinimumSubleaseRentalsUnderOperatingLeasesWithinThreeYears
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
Name: | ceco_FutureMinimumSubleaseRentalsUnderOperatingLeasesWithinTwoYears
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
Name: | us-gaap_PropertySubjectToOrAvailableForOperatingLeaseLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis=ceco_ContinuingOperationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertySubjectToOrAvailableForOperatingLeaseAxis=ceco_DiscontinuedOperationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |