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OPERATING SEGMENTS (Details 2) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Reconciliation of adjusted EBITDA to Net Income    
Adjusted EBITDA $ 27,230ecol_AdjustedEbitda $ 20,275ecol_AdjustedEbitda
Reconciliation to Net Income    
Income tax expense (2,902)us-gaap_IncomeTaxExpenseBenefit (5,227)us-gaap_IncomeTaxExpenseBenefit
Interest expense (5,694)us-gaap_InterestExpense (86)us-gaap_InterestExpense
Interest income 41us-gaap_InvestmentIncomeInterest 44us-gaap_InvestmentIncomeInterest
Foreign currency loss (1,067)us-gaap_ForeignCurrencyTransactionGainLossBeforeTax (940)us-gaap_ForeignCurrencyTransactionGainLossBeforeTax
Other income 536us-gaap_OtherNonoperatingIncomeExpense 86us-gaap_OtherNonoperatingIncomeExpense
Depreciation and amortization of plant and equipment (7,479)us-gaap_DepreciationAmortizationAndAccretionNet (3,839)us-gaap_DepreciationAmortizationAndAccretionNet
Amortization of intangibles (3,302)us-gaap_AmortizationOfIntangibleAssets (352)us-gaap_AmortizationOfIntangibleAssets
Stock-based Compensation (463)us-gaap_ShareBasedCompensation (270)us-gaap_ShareBasedCompensation
Accretion and non-cash adjustment of closure & post-closure liabilities (1,035)ecol_AccretionAndNonCashAdjustmentOfClosurePostClosureLiabilities (330)ecol_AccretionAndNonCashAdjustmentOfClosurePostClosureLiabilities
Net income 5,865us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 9,361us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Operating Segment | Environmental Services    
Reconciliation of adjusted EBITDA to Net Income    
Adjusted EBITDA 37,129ecol_AdjustedEbitda
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= ecol_EnvironmentalServicesSegmentMember
24,044ecol_AdjustedEbitda
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= ecol_EnvironmentalServicesSegmentMember
Operating Segment | Field & Industrial Services    
Reconciliation of adjusted EBITDA to Net Income    
Adjusted EBITDA 3,109ecol_AdjustedEbitda
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= ecol_FieldAndIndustrialServicesSegmentMember
 
Corporate    
Reconciliation of adjusted EBITDA to Net Income    
Adjusted EBITDA $ (13,008)ecol_AdjustedEbitda
/ us-gaap_ConsolidationItemsAxis
= us-gaap_CorporateNonSegmentMember
$ (3,769)ecol_AdjustedEbitda
/ us-gaap_ConsolidationItemsAxis
= us-gaap_CorporateNonSegmentMember