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Investments - Additional Information (Detail) (USD $)	12 Months Ended
	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	4,800,000us-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	3,200,000ceco_EquityMethodInvestmentAdditionalInvestment / us-gaap_BusinessAcquisitionAxis = ceco_CckfMember
Retained earnings		100,000ceco_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	100,000us-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	$ 500,000us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax / us-gaap_InvestmentTypeAxis = us-gaap_MunicipalBondsMember

X

- Definition

The adjustment recorded to beginning retained earnings balance due to a change in method for investments from cost method to equity method.

+ References

No definition available.

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- Definition

The amount of additional investment recorded during the period for equity method investments.

+ References

No definition available.

+ Details

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- Definition

Equity method investment percentage stake acquired from third party by investee.

+ References

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- Definition

The minimum length of time, in years, that the amount of investment in debt and equity securities categorized neither as trading securities nor held-to-maturity securities and intended be sold or mature greater than one year or operating cycle, if longer, are in a continuous unrealized loss/gain position.

+ References

No definition available.

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- Definition

The maximum length of time, in years, that the amount of investment in debt and equity securities categorized neither as trading securities nor held-to-maturity securities and intended be sold or mature one year or operating cycle, if longer, are in a continuous unrealized loss/gain position.

+ References

No definition available.

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- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

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- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 323

-SubTopic 10

-Section 50

-Paragraph 3

-Subparagraph (a)(1)

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- Definition

This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

+ References

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

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- Definition

This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.

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- Definition

The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

+ References

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- Definition

Amount after tax, before reclassification adjustments, of unrealized holding gain (loss) on available-for-sale securities.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

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