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Share-Based Compensation - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified | 12 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Jun. 30, 2014 | Dec. 31, 2012 | Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares issuable upon exercise of outstanding options | 3,781,964 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber | 3,900,435 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber |  | 2,591,887 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber | 3,353,462 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
Number of shares to reduce shares available to grant by upon vesting of restricted stock units | 598,892 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber | 760,183 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber |  | 1,998,224 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber | 1,796,747 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
Number of shares to reduce shares available to grant by upon vesting of deferred stock units | 116,952 ceco_ShareBasedCompensationArrangementByShareBasedPaymentAwardDeferredStockUnitsNonvestedNumber | 0 ceco_ShareBasedCompensationArrangementByShareBasedPaymentAwardDeferredStockUnitsNonvestedNumber |  |  |
Estimated pretax compensation expense | $ 5.0 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized |  |  |  |
Estimated pretax compensation expenses expiration, years | 4 years |  |  |  |
Service period in years | 4 years |  |  |  |
Restricted stock awards settled in stock exercisable in percentage | 25.00%ceco_RestrictedStockAwardsExercisableInPercentage |  |  |  |
Restricted stock awards settled in cash exercisable in percentage | 25.00%ceco_RestrictedStockUnitsToBeSettledInCashExercisableInPercentage |  |  |  |
Stock compensation and recognized liability | 4.8 ceco_ExpenseForRestrictedStockUnitsSettledInCash |  |  |  |
Long-term incentive, cash-based awards | 3 years |  |  |  |
Performance unit award expenses | $ 3.5 ceco_PerformanceUnitAwardsExpense | $ 1.1 ceco_PerformanceUnitAwardsExpense |  |  |
Volatility assumptions for estimating the fair value of stock options minimum | 72.90%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMinimum |  |  |  |
Volatility assumptions for estimating the fair value of stock options maximum | 74.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRateMaximum |  |  |  |
2008 Incentive Compensation Plan [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Common stock subject to awards of stock options or stock appreciation rights payable in shares | 1.0 ceco_CommonStockSubjectToAwardsOfStockOptionsOrStockAppreciationRightsPayableInShares / us-gaap_PlanNameAxis = ceco_TwoThousandAndEightIncentiveCompensationPlanMember |  |  |  |
Common stock subject to any other form of award | 1.67 ceco_CommonStockSubjectToAnyFormOfAwardsOtherThanStockOptionsOrStockAppreciationRightsPayableInShares / us-gaap_PlanNameAxis = ceco_TwoThousandAndEightIncentiveCompensationPlanMember |  |  |  |
Common stock available for future share-based awards | 6,100,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant / us-gaap_PlanNameAxis = ceco_TwoThousandAndEightIncentiveCompensationPlanMember |  |  |  |
Shares issuable upon exercise of outstanding options | 3,800,000 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber / us-gaap_PlanNameAxis = ceco_TwoThousandAndEightIncentiveCompensationPlanMember |  |  |  |
Non-Employee Directors' Stock Options [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Expiration period in years | 10 years |  |  |  |
Vesting period in years | 4 |  |  |  |
Employee Stock Option [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Employee stock options exercisable in percentage | 25.00%ceco_EmployeeStockOptionsExercisableInPercentage / us-gaap_AwardTypeAxis = us-gaap_EmployeeStockOptionMember |  |  |  |
Service period in years | 4 years |  |  |  |
Expiration period in years | 10 years |  |  |  |
Restricted Stock Shares [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of shares to reduce shares available to grant by upon vesting of restricted stock units | 42,752 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember | 221,562 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember |  | 854,291 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember | 1,796,747 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockMember
Service period in years | 4 years |  |  |  |
Deferred Stock Units to be Settled in Shares [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Service period in years |  |  | 3 years |  |
Restricted Stock Units RSU [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Number of shares to reduce shares available to grant by upon vesting of restricted stock units | 556,140 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember | 538,621 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember |  | 1,143,933 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber / us-gaap_AwardTypeAxis = us-gaap_RestrictedStockUnitsRSUMember |

X
- Definition The number that is multiplied against each share issued that are subject to awards of any stock-based compensation other than stock options and stock appreciation rights which is then subtracted from the available authorized grant pool. + References No definition available. + Details
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- Definition The number that is multiplied against each share issued that are subject to awards of any stock-based compensation other than stock options and stock appreciation rights which is then subtracted from the available authorized grant pool. + References No definition available. + Details
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- Definition The yearly percentage that vests for employee stock option grants. + References No definition available. + Details
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- Definition The number of years over which estimated share-based compensation expense for all unvested share-based awards that have been granted to participants will be recognized. + References No definition available. + Details
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- Definition The expense recorded during the period related to cash-settled restricted stock unit awards. + References No definition available. + Details
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- Definition The aggregate amount of expense recorded during the period for long term incentive awards granted to employees not stock-based to be settled in cash. + References No definition available. + Details
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- Definition The yearly percentage that vests for restricted stock awards. + References No definition available. + Details
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- Definition The yearly percentage that vests for restricted stock units settled in cash. + References No definition available. + Details
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- Definition The vesting period in years for stock option grants. + References No definition available. + Details
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- Definition The number of non-vested equity-based payment deferred stock units that validly exist and are outstanding as of the balance sheet date. + References No definition available. + Details
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- Definition Unrecognized cost of unvested share-based compensation awards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The estimated measure of the maximum percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References No definition available. + Details
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- Definition The estimated measure of the minimum percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References No definition available. + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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