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Acquisitions - Fair Values of Assets Acquired and Liabilities Assumed at Date of Closing - HEE (Detail) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
--- | --- | --- | ---
Business Acquisition [Line Items] |  |  |
Goodwill | $ 167,547 us-gaap_Goodwill | $ 134,062 us-gaap_Goodwill | $ 19,548 us-gaap_Goodwill
HEE [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Current assets | 913 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentAssets / us-gaap_BusinessAcquisitionAxis = cece_HeeEnvironmentalEngineeringLlcMember |  |
Property and equipment | 158 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment / us-gaap_BusinessAcquisitionAxis = cece_HeeEnvironmentalEngineeringLlcMember |  |
Goodwill | 5,644 us-gaap_Goodwill / us-gaap_BusinessAcquisitionAxis = cece_HeeEnvironmentalEngineeringLlcMember |  |
Intangible - finite life, net | 2,690 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIntangibles / us-gaap_BusinessAcquisitionAxis = cece_HeeEnvironmentalEngineeringLlcMember |  |
Intangible - indefinite life | 510 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedIndefiniteLivedIntangibleAssets / us-gaap_BusinessAcquisitionAxis = cece_HeeEnvironmentalEngineeringLlcMember |  |
Total assets acquired | 9,915 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedAssets / us-gaap_BusinessAcquisitionAxis = cece_HeeEnvironmentalEngineeringLlcMember |  |
Current liabilities assumed | (415)us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedCurrentLiabilities / us-gaap_BusinessAcquisitionAxis = cece_HeeEnvironmentalEngineeringLlcMember |  |
Net assets acquired | $ 9,500 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredGoodwillAndLiabilitiesAssumedNet / us-gaap_BusinessAcquisitionAxis = cece_HeeEnvironmentalEngineeringLlcMember |  |

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