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DESCRIPTION OF BUSINESS (Details)
12 Months Ended
Dec. 31, 2014
segment
Jul. 14, 2014
Number of operating segments 2us-gaap_NumberOfOperatingSegments  
EQ    
Percentage of outstanding shares acquired   100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
/ dei_LegalEntityAxis
= ecol_EQHoldingsIncMember