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Income Taxes - Schedule of Reconciliation of Beginning and Ending Amount of Gross Unrecognized Tax Benefits (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Gross unrecognized tax benefits, beginning of the year	$ 13,900ceco_UnrecognizedTaxBenefitsBeforeInterestAndPenalties	$ 24,479ceco_UnrecognizedTaxBenefitsBeforeInterestAndPenalties	$ 29,892ceco_UnrecognizedTaxBenefitsBeforeInterestAndPenalties
Additions for tax positions of prior years	129us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	3,582us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions
Reductions for tax positions of prior years			(3,548)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions
Additions for tax positions related to the current year	931us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	813us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	958us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions
Reductions due to settlements	(4,064)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	(13,707)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	(2,531)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities
Reductions due to lapse of applicable statute of limitations	(1,578)us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	(1,267)us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations	(292)us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations
Subtotal	9,318ceco_UnrecognizedTaxBenefitsBeforeInterestAndPenalties	13,900ceco_UnrecognizedTaxBenefitsBeforeInterestAndPenalties	24,479ceco_UnrecognizedTaxBenefitsBeforeInterestAndPenalties
Interest and penalties	2,820us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense	3,107us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense	3,794us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense
Total gross unrecognized tax benefits, end of the year	$ 12,138us-gaap_UnrecognizedTaxBenefits	$ 17,007us-gaap_UnrecognizedTaxBenefits	$ 28,273us-gaap_UnrecognizedTaxBenefits

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Unrecognized Tax Benefits Before Interest And Penalties

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Amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

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Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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Amount of decrease in unrecognized tax benefits resulting from settlements with taxing authorities.

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Amount of expense for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

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Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return.

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