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Investments - Additional Information (Detail) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Financial Instruments [Line Items] |  |  |
Period cash equivalents and short-term investments have been in continuous unrealized loss position, years, maximum | 1 year |  |
Period cash equivalents and long-term investments have been in continuous unrealized loss position, years, minimum | 1 year |  |
Cumulative unrealized income (loss) on municipal bonds | $ (350,000)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax | $ (13,000)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax | $ (152,000)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax
CCKF [Member] |  |  |
Financial Instruments [Line Items] |  |  |
Non controlling interest | 4,800,000 us-gaap_EquityMethodInvestments / us-gaap_BusinessAcquisitionAxis = ceco_CckfMember |  |
Percentage of investment in equity affiliate | 30.70%us-gaap_MinorityInterestOwnershipPercentageByParent / us-gaap_BusinessAcquisitionAxis = ceco_CckfMember |  |
Equity method investment percentage | 30.70%us-gaap_EquityMethodInvestmentOwnershipPercentage / us-gaap_BusinessAcquisitionAxis = ceco_CckfMember |  |
Additional investment in affiliate | 3,200,000 ceco_EquityMethodInvestmentAdditionalInvestment / us-gaap_BusinessAcquisitionAxis = ceco_CckfMember |  |
Retained earnings |  | 100,000 ceco_AdjustmentsToRetainedEarningsDeficitBeginningOfPeriodEquityMethod / us-gaap_BusinessAcquisitionAxis = ceco_CckfMember |
Maximum [Member] | CCKF [Member] |  |  |
Financial Instruments [Line Items] |  |  |
Percentage of investment in interest |  |  | 20.00%ceco_EquityMethodInvestmentPercentageStakeAcquiredFromThirdPartyByInvestee / us-gaap_BusinessAcquisitionAxis = ceco_CckfMember / us-gaap_RangeAxis = us-gaap_MaximumMember
Income from investment in affiliate | 100,000 us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_BusinessAcquisitionAxis = ceco_CckfMember / us-gaap_RangeAxis = us-gaap_MaximumMember |  |
Municipal Bond [Member] |  |  |
Financial Instruments [Line Items] |  |  |
Period debt obligations mature, years, maximum | 1 year |  |
Cumulative unrealized income (loss) on municipal bonds | $ 500,000 us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax / us-gaap_InvestmentTypeAxis = us-gaap_MunicipalBondsMember |  |

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