Number of expected individual arbitrations sent back to state court.

No definition available.

Name:	ceco_NumberOfExpectedIndividualArbitrationsSentBackToStateCourt
Namespace Prefix:	ceco_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount awarded to other party in judgment or settlement of litigation.

+ References

No definition available.

+ Details

Name:	us-gaap_LitigationSettlementAmountAwardedToOtherParty
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of litigation expense, including but not limited to legal, forensic, accounting, and investigative fees.

+ References

No definition available.

+ Details

Name:	us-gaap_LitigationSettlementExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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

- Definition

Amount of loss contingency liability.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=118942415&loc=d3e14326-108349

+ Details

Name:	us-gaap_LossContingencyAccrualAtCarryingValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The total number of new claims filed pertaining to a loss contingency during the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118942415&loc=d3e14435-108349

+ Details

Name:	us-gaap_LossContingencyNewClaimsFiledNumber
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	srt_LitigationCaseAxis=ceco_FederalTradeCommissionSettlementAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_BalanceSheetLocationAxis=ceco_OtherAccruedExpensesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Contingencies - Additional Information (Detail) $ in Millions	3 Months Ended	5 Months Ended	6 Months Ended
	Jun. 30, 2019 USD ($)	Jul. 31, 2018 Claim	Jun. 30, 2019 USD ($) Claim	Dec. 31, 2018 USD ($)
Loss Contingencies [Line Items]
Number of arbitration claims filed \| Claim		310
Number of expected individual arbitrations sent back to state court \| Claim			65
FTC Agreement [Member]
Loss Contingencies [Line Items]
Litigation settlement, amount awarded to other party			$ 30.0
Litigation pre-tax settlement charge	$ 30.0
Other Accrued Expenses [Member]
Loss Contingencies [Line Items]
Accrual for legal fees and settlements	$ 30.8		$ 30.8	$ 6.1