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Business Segment Information - Long-lived assets by geographic area (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2025 | Dec. 31, 2024
Segment Reporting Information [Line Items] |  |
Total Long-Lived Assets | $ 496,404 | $ 428,728
US |  |
Segment Reporting Information [Line Items] |  |
Total Long-Lived Assets | 370,971 | 332,162
GB |  |
Segment Reporting Information [Line Items] |  |
Total Long-Lived Assets | 28,122 | 27,003
CN |  |
Segment Reporting Information [Line Items] |  |
Total Long-Lived Assets | 39,438 | 36,315
Other |  |
Segment Reporting Information [Line Items] |  |
Total Long-Lived Assets | $ 57,873 | $ 33,248

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- Definition Total Long-Lived Assets + References No definition available. + Details
Name: | ceco_TotalLong-LivedAssets
Namespace Prefix: | ceco_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

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- Details
Name: | srt_StatementGeographicalAxis=country_US
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_StatementGeographicalAxis=country_GB
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_StatementGeographicalAxis=country_CN
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementGeographicalAxis=ceco_OtherMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |