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Quarterly Financial Summary (Unaudited) - Schedule of Quarterly Financial Summary (Parenthetical) (Detail) (USD $) | 0 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 03, 2013 | Dec. 31, 2014 | Sep. 30, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Jun. 30, 2014
Schedule Of Quarterly Financial Summary [Line Items] |  |  |  |  |  |  |  |  |  |  |
Trade name impairment charges |  | $ 14,200,000 ceco_IntangibleAssetImpairmentCharges | $ 3,000,000 ceco_IntangibleAssetImpairmentCharges |  |  | $ 4,000,000 ceco_IntangibleAssetImpairmentCharges |  | $ 14,200,000 ceco_IntangibleAssetImpairmentCharges |  |  |
Loss on sale of business |  |  |  |  |  |  | 6,700,000 us-gaap_GainLossOnSaleOfBusiness |  | (6,905,000)us-gaap_GainLossOnSaleOfBusiness |  |
Goodwill and asset impairment charges, discontinued operations |  | 10,300,000 ceco_DisposalGroupIncludingDiscontinuedOperationGoodwillAndIntangibleAssetImpairmentCharge | 1,500,000 ceco_DisposalGroupIncludingDiscontinuedOperationGoodwillAndIntangibleAssetImpairmentCharge | 1,000,000 ceco_DisposalGroupIncludingDiscontinuedOperationGoodwillAndIntangibleAssetImpairmentCharge | 10,700,000 ceco_DisposalGroupIncludingDiscontinuedOperationGoodwillAndIntangibleAssetImpairmentCharge | 2,300,000 ceco_DisposalGroupIncludingDiscontinuedOperationGoodwillAndIntangibleAssetImpairmentCharge |  | 10,300,000 ceco_DisposalGroupIncludingDiscontinuedOperationGoodwillAndIntangibleAssetImpairmentCharge | 1,000,000 ceco_DisposalGroupIncludingDiscontinuedOperationGoodwillAndIntangibleAssetImpairmentCharge |  | 7,400,000 ceco_DisposalGroupIncludingDiscontinuedOperationGoodwillAndIntangibleAssetImpairmentCharge
Decrease in revenue |  | 9,400,000 ceco_CumulativeAdjustmentRelatedToChangeInAccountingMethodologyForRevenueRecognition |  |  |  |  |  |  |  |  |
Expense for bad debts |  | 7,500,000 ceco_CumulativeAdjustmentRelatedToChangeInAccountingMethodologyForBadDebtExpense |  |  |  |  |  |  |  |  |
Loss from Discontinuing Operations |  | 500,000 ceco_CumulativeAdjustmentRelatedToChangeInAccountingMethodologyForIncomeLossFromDiscontinuingOperations |  |  |  |  |  |  |  |  |
Valuation allowances against deferred tax assets |  | 71,800,000 us-gaap_DeferredTaxAssetsValuationAllowance |  | 72,200,000 us-gaap_DeferredTaxAssetsValuationAllowance |  |  |  | 71,800,000 us-gaap_DeferredTaxAssetsValuationAllowance | 72,200,000 us-gaap_DeferredTaxAssetsValuationAllowance |  |
Amount from legal settlement |  |  |  | 15,500,000 ceco_PendingLitigationSettlementAmount |  |  |  |  |  |  |
Asset impairment charges |  |  | 11,500,000 us-gaap_AssetImpairmentCharges | 7,000,000 us-gaap_AssetImpairmentCharges |  |  |  | 16,898,000 us-gaap_AssetImpairmentCharges | 8,681,000 us-gaap_AssetImpairmentCharges | 86,606,000 us-gaap_AssetImpairmentCharges |
Realized gain on sale | 130,100,000 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax |  |  |  |  |  |  |  |  |  |
Insurance recovery |  |  | 8,600,000 us-gaap_InsuranceRecoveries |  |  |  |  |  |  |  |
Goodwill and asset impairment charges |  |  |  |  | 11,600,000 us-gaap_GoodwillAndIntangibleAssetImpairment | 10,000,000 us-gaap_GoodwillAndIntangibleAssetImpairment |  | 36,209,000 us-gaap_GoodwillAndIntangibleAssetImpairment | 22,691,000 us-gaap_GoodwillAndIntangibleAssetImpairment | 127,007,000 us-gaap_GoodwillAndIntangibleAssetImpairment |
International Segment Sale [Member] |  |  |  |  |  |  |  |  |  |  |
Schedule Of Quarterly Financial Summary [Line Items] |  |  |  |  |  |  |  |  |  |  |
Realized gain on sale |  |  |  | $ 130,100,000 us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax / us-gaap_StatementBusinessSegmentsAxis = ceco_InternationalSegmentSaleMember |  |  |  |  |  |  |

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- Definition Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=8077374&loc=d3e2420-110228 + Details
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