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Investments - Investments from Continuing Operations (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]
Total investments (available for sale), Cost	$ 131,058us-gaap_AvailableForSaleSecuritiesAmortizedCost	$ 39,441us-gaap_AvailableForSaleSecuritiesAmortizedCost
Total investments (available for sale), Gross Unrealized Gain	8us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains	1us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains
Total investments (available for sale), Gross Unrealized (Loss)	(834)us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss	(476)us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss
Total investments (available for sale), Fair value	130,232us-gaap_AvailableForSaleSecurities	38,966us-gaap_AvailableForSaleSecurities
Municipal Bond [Member]
Schedule of Available-for-sale Securities [Line Items]
Total investments (available for sale), Fair value	14,199us-gaap_AvailableForSaleSecurities / us-gaap_InvestmentTypeAxis = us-gaap_MunicipalBondsMember	7,374us-gaap_AvailableForSaleSecurities / us-gaap_InvestmentTypeAxis = us-gaap_MunicipalBondsMember
Non-governmental Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Total investments (available for sale), Fair value	98,130us-gaap_AvailableForSaleSecurities / us-gaap_InvestmentTypeAxis = ceco_NonUsGovernmentAgenciesDebtSecuritiesMember
Treasury and Federal Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Total investments (available for sale), Fair value	17,903us-gaap_AvailableForSaleSecurities / us-gaap_InvestmentTypeAxis = ceco_TreasuryAndFederalAgenciesMember
Short-term Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Total investments (available for sale), Cost	123,208us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_ScheduleOfFairValueOfSeparateAccountsByMajorCategoryOfInvestmentAxis = us-gaap_ShortTermInvestmentsMember
Total investments (available for sale), Gross Unrealized Gain	8us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains / us-gaap_ScheduleOfFairValueOfSeparateAccountsByMajorCategoryOfInvestmentAxis = us-gaap_ShortTermInvestmentsMember
Total investments (available for sale), Gross Unrealized (Loss)	(358)us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss / us-gaap_ScheduleOfFairValueOfSeparateAccountsByMajorCategoryOfInvestmentAxis = us-gaap_ShortTermInvestmentsMember
Total investments (available for sale), Fair value	122,858us-gaap_AvailableForSaleSecurities / us-gaap_ScheduleOfFairValueOfSeparateAccountsByMajorCategoryOfInvestmentAxis = us-gaap_ShortTermInvestmentsMember
Short-term Investments [Member] | Municipal Bond [Member]
Schedule of Available-for-sale Securities [Line Items]
Total investments (available for sale), Cost	6,880us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InvestmentTypeAxis = us-gaap_MunicipalBondsMember / us-gaap_ScheduleOfFairValueOfSeparateAccountsByMajorCategoryOfInvestmentAxis = us-gaap_ShortTermInvestmentsMember
Total investments (available for sale), Gross Unrealized Gain	1us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains / us-gaap_InvestmentTypeAxis = us-gaap_MunicipalBondsMember / us-gaap_ScheduleOfFairValueOfSeparateAccountsByMajorCategoryOfInvestmentAxis = us-gaap_ShortTermInvestmentsMember
Total investments (available for sale), Gross Unrealized (Loss)	(56)us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss / us-gaap_InvestmentTypeAxis = us-gaap_MunicipalBondsMember / us-gaap_ScheduleOfFairValueOfSeparateAccountsByMajorCategoryOfInvestmentAxis = us-gaap_ShortTermInvestmentsMember
Total investments (available for sale), Fair value	6,825us-gaap_AvailableForSaleSecurities / us-gaap_InvestmentTypeAxis = us-gaap_MunicipalBondsMember / us-gaap_ScheduleOfFairValueOfSeparateAccountsByMajorCategoryOfInvestmentAxis = us-gaap_ShortTermInvestmentsMember
Short-term Investments [Member] | Non-governmental Debt Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Total investments (available for sale), Cost	98,400us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InvestmentTypeAxis = ceco_NonUsGovernmentAgenciesDebtSecuritiesMember / us-gaap_ScheduleOfFairValueOfSeparateAccountsByMajorCategoryOfInvestmentAxis = us-gaap_ShortTermInvestmentsMember
Total investments (available for sale), Gross Unrealized Gain	1us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains / us-gaap_InvestmentTypeAxis = ceco_NonUsGovernmentAgenciesDebtSecuritiesMember / us-gaap_ScheduleOfFairValueOfSeparateAccountsByMajorCategoryOfInvestmentAxis = us-gaap_ShortTermInvestmentsMember
Total investments (available for sale), Gross Unrealized (Loss)	(271)us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss / us-gaap_InvestmentTypeAxis = ceco_NonUsGovernmentAgenciesDebtSecuritiesMember / us-gaap_ScheduleOfFairValueOfSeparateAccountsByMajorCategoryOfInvestmentAxis = us-gaap_ShortTermInvestmentsMember
Total investments (available for sale), Fair value	98,130us-gaap_AvailableForSaleSecurities / us-gaap_InvestmentTypeAxis = ceco_NonUsGovernmentAgenciesDebtSecuritiesMember / us-gaap_ScheduleOfFairValueOfSeparateAccountsByMajorCategoryOfInvestmentAxis = us-gaap_ShortTermInvestmentsMember
Short-term Investments [Member] | Treasury and Federal Agencies [Member]
Schedule of Available-for-sale Securities [Line Items]
Total investments (available for sale), Cost	17,928us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InvestmentTypeAxis = ceco_TreasuryAndFederalAgenciesMember / us-gaap_ScheduleOfFairValueOfSeparateAccountsByMajorCategoryOfInvestmentAxis = us-gaap_ShortTermInvestmentsMember
Total investments (available for sale), Gross Unrealized Gain	6us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains / us-gaap_InvestmentTypeAxis = ceco_TreasuryAndFederalAgenciesMember / us-gaap_ScheduleOfFairValueOfSeparateAccountsByMajorCategoryOfInvestmentAxis = us-gaap_ShortTermInvestmentsMember
Total investments (available for sale), Gross Unrealized (Loss)	(31)us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss / us-gaap_InvestmentTypeAxis = ceco_TreasuryAndFederalAgenciesMember / us-gaap_ScheduleOfFairValueOfSeparateAccountsByMajorCategoryOfInvestmentAxis = us-gaap_ShortTermInvestmentsMember
Total investments (available for sale), Fair value	17,903us-gaap_AvailableForSaleSecurities / us-gaap_InvestmentTypeAxis = ceco_TreasuryAndFederalAgenciesMember / us-gaap_ScheduleOfFairValueOfSeparateAccountsByMajorCategoryOfInvestmentAxis = us-gaap_ShortTermInvestmentsMember
Short-term Investments [Member] | U.S. Treasury Bills [Member]
Schedule of Available-for-sale Securities [Line Items]
Total investments (available for sale), Cost		31,591us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InvestmentTypeAxis = ceco_UsTreasuryBillsMember / us-gaap_ScheduleOfFairValueOfSeparateAccountsByMajorCategoryOfInvestmentAxis = us-gaap_ShortTermInvestmentsMember
Total investments (available for sale), Gross Unrealized Gain		1us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains / us-gaap_InvestmentTypeAxis = ceco_UsTreasuryBillsMember / us-gaap_ScheduleOfFairValueOfSeparateAccountsByMajorCategoryOfInvestmentAxis = us-gaap_ShortTermInvestmentsMember
Total investments (available for sale), Fair value		31,592us-gaap_AvailableForSaleSecurities / us-gaap_InvestmentTypeAxis = ceco_UsTreasuryBillsMember / us-gaap_ScheduleOfFairValueOfSeparateAccountsByMajorCategoryOfInvestmentAxis = us-gaap_ShortTermInvestmentsMember
Long Term Investments [Member] | Municipal Bond [Member]
Schedule of Available-for-sale Securities [Line Items]
Total investments (available for sale), Cost	7,850us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InvestmentTypeAxis = us-gaap_MunicipalBondsMember / us-gaap_ScheduleOfFairValueOfSeparateAccountsByMajorCategoryOfInvestmentAxis = ceco_LongTermInvestmentsMember	7,850us-gaap_AvailableForSaleSecuritiesAmortizedCost / us-gaap_InvestmentTypeAxis = us-gaap_MunicipalBondsMember / us-gaap_ScheduleOfFairValueOfSeparateAccountsByMajorCategoryOfInvestmentAxis = ceco_LongTermInvestmentsMember
Total investments (available for sale), Gross Unrealized (Loss)	(476)us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss / us-gaap_InvestmentTypeAxis = us-gaap_MunicipalBondsMember / us-gaap_ScheduleOfFairValueOfSeparateAccountsByMajorCategoryOfInvestmentAxis = ceco_LongTermInvestmentsMember	(476)us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss / us-gaap_InvestmentTypeAxis = us-gaap_MunicipalBondsMember / us-gaap_ScheduleOfFairValueOfSeparateAccountsByMajorCategoryOfInvestmentAxis = ceco_LongTermInvestmentsMember
Total investments (available for sale), Fair value	$ 7,374us-gaap_AvailableForSaleSecurities / us-gaap_InvestmentTypeAxis = us-gaap_MunicipalBondsMember / us-gaap_ScheduleOfFairValueOfSeparateAccountsByMajorCategoryOfInvestmentAxis = ceco_LongTermInvestmentsMember	$ 7,374us-gaap_AvailableForSaleSecurities / us-gaap_InvestmentTypeAxis = us-gaap_MunicipalBondsMember / us-gaap_ScheduleOfFairValueOfSeparateAccountsByMajorCategoryOfInvestmentAxis = ceco_LongTermInvestmentsMember

X

- Definition

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 25

-Paragraph 1

-Subparagraph (b)

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-Paragraph 5

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-Publisher FASB

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

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Amount of unrealized gain before deducting unrealized loss on investments in debt and equity securities classified as available-for-sale securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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Amount of unrealized loss before deducting unrealized gain on investments in available-for-sale securities.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

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