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Subsequent Event - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended 0 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Feb. 12, 2015
Schedule of Reverse Stock Split [Line Items]        
Amount paid in consideration for cancellation of employment $ 9,046us-gaap_AllocatedShareBasedCompensationExpense $ 10,248us-gaap_AllocatedShareBasedCompensationExpense $ 9,544us-gaap_AllocatedShareBasedCompensationExpense  
Separation Agreement [Member] | Subsequent Event [Member]        
Schedule of Reverse Stock Split [Line Items]        
Amount paid in consideration for cancellation of employment       $ 2,500us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= ceco_EmployeeSeparationAgreementMember
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember