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Credit Agreement - Schedule of U.S. Credit Agreement (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Credit Agreement:    
Credit facility borrowings $ 10,000us-gaap_LineOfCredit  
U.S. Credit Agreement [Member]    
Credit Agreement:    
Credit facility remaining availability 98,437us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_LineOfCreditFacilityAxis
= ceco_USCreditAgreementMember		 70,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_LineOfCreditFacilityAxis
= ceco_USCreditAgreementMember
Credit facility borrowings 10,000us-gaap_LineOfCredit
/ us-gaap_LineOfCreditFacilityAxis
= ceco_USCreditAgreementMember		  
Outstanding letters of credit 11,563us-gaap_LettersOfCreditOutstandingAmount
/ us-gaap_LineOfCreditFacilityAxis
= ceco_USCreditAgreementMember		 [1],[2] 12,318us-gaap_LettersOfCreditOutstandingAmount
/ us-gaap_LineOfCreditFacilityAxis
= ceco_USCreditAgreementMember		 [1],[2]
Availability of additional letters of credit 8,437ceco_LineOfCreditFacilityAvailabilityForAdditionalLettersOfCredit
/ us-gaap_LineOfCreditFacilityAxis
= ceco_USCreditAgreementMember		 [3] 7,682ceco_LineOfCreditFacilityAvailabilityForAdditionalLettersOfCredit
/ us-gaap_LineOfCreditFacilityAxis
= ceco_USCreditAgreementMember		 [3]
Weighted average daily revolving credit borrowings for the year ended $ 9ceco_LineOfCreditFacilityMaximumBorrowingCapacityPerDay
/ us-gaap_LineOfCreditFacilityAxis
= ceco_USCreditAgreementMember		 $ 40ceco_LineOfCreditFacilityMaximumBorrowingCapacityPerDay
/ us-gaap_LineOfCreditFacilityAxis
= ceco_USCreditAgreementMember
Weighted average annual interest rate 1.67%us-gaap_LineOfCreditFacilityInterestRateDuringPeriod
/ us-gaap_LineOfCreditFacilityAxis
= ceco_USCreditAgreementMember		 5.25%us-gaap_LineOfCreditFacilityInterestRateDuringPeriod
/ us-gaap_LineOfCreditFacilityAxis
= ceco_USCreditAgreementMember
Commitment fee rate 0.25%us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
/ us-gaap_LineOfCreditFacilityAxis
= ceco_USCreditAgreementMember		 0.25%us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
/ us-gaap_LineOfCreditFacilityAxis
= ceco_USCreditAgreementMember
Letter of credit fee rate 0.75%ceco_LineOfCreditFacilityPercentageOfLetterOfCreditFeeRate
/ us-gaap_LineOfCreditFacilityAxis
= ceco_USCreditAgreementMember		 0.75%ceco_LineOfCreditFacilityPercentageOfLetterOfCreditFeeRate
/ us-gaap_LineOfCreditFacilityAxis
= ceco_USCreditAgreementMember
[1] Represents letters of credit which are fully collateralized with $11.6 million and $12.6 million of restricted cash as of December 31, 2014 and 2013, respectively.
[2] As of December 31, 2014, outstanding letters of credit not related to the Credit Agreement totaled $1.4 million, which amount is fully collateralized with restricted cash, which is in addition to the $11.6 million reflected above.
[3] The letters of credit sublimit of $20.0 million under the Credit Agreement is part of, not in addition to, the $120.0 million aggregate commitments.