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CONCENTRATIONS AND CREDIT RISK (Details) (Total revenue, One customer, Major Customers)
3 Months Ended
Mar. 31, 2014
Total revenue | One customer | Major Customers
 
CONCENTRATIONS AND CREDIT RISK  
Concentration of risk (as a percent) 11.00%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesRevenueServicesNetMember
/ us-gaap_ConcentrationRiskByTypeAxis
= us-gaap_CustomerConcentrationRiskMember
/ us-gaap_MajorCustomersAxis
= ecol_OneSignificantCustomerMember