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SEGMENT REPORTING (Details 2) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Reconciliation of adjusted EBITDA to Net Income                      
Adjusted EBITDA                 $ 108,976ecol_AdjustedEbitda $ 71,186ecol_AdjustedEbitda $ 58,352ecol_AdjustedEbitda
Reconciliation to Net Income                      
Income tax expense                 (22,814)us-gaap_IncomeTaxExpenseBenefit (17,996)us-gaap_IncomeTaxExpenseBenefit (16,059)us-gaap_IncomeTaxExpenseBenefit
Interest expense                 (10,677)us-gaap_InterestExpense (828)us-gaap_InterestExpense (878)us-gaap_InterestExpense
Interest income                 107us-gaap_InvestmentIncomeInterest 19us-gaap_InvestmentIncomeInterest 17us-gaap_InvestmentIncomeInterest
Foreign currency gain (loss)                 (1,499)us-gaap_ForeignCurrencyTransactionGainLossBeforeTax (2,327)us-gaap_ForeignCurrencyTransactionGainLossBeforeTax 1,213us-gaap_ForeignCurrencyTransactionGainLossBeforeTax
Other                 669us-gaap_OtherNonoperatingIncomeExpense 352us-gaap_OtherNonoperatingIncomeExpense 728us-gaap_OtherNonoperatingIncomeExpense
Depreciation, Amortization and Accretion, Net                 (24,413)us-gaap_DepreciationAmortizationAndAccretionNet (14,815)us-gaap_DepreciationAmortizationAndAccretionNet (13,916)us-gaap_DepreciationAmortizationAndAccretionNet
Amortization of Intangible                 (8,207)us-gaap_AmortizationOfIntangibleAssets (1,461)us-gaap_AmortizationOfIntangibleAssets (1,469)us-gaap_AmortizationOfIntangibleAssets
Share-based Compensation                 (1,250)us-gaap_ShareBasedCompensation (865)us-gaap_ShareBasedCompensation (846)us-gaap_ShareBasedCompensation
Accretion and non-cash adjustment of closure & post-closure liabilities                 (2,656)ecol_AccretionAndNonCashAdjustmentOfClosurePostClosureLiabilities (1,114)ecol_AccretionAndNonCashAdjustmentOfClosurePostClosureLiabilities (1,483)ecol_AccretionAndNonCashAdjustmentOfClosurePostClosureLiabilities
Net income 8,677us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 13,333us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 6,865us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 9,361us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 9,207us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 10,328us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 7,210us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 5,406us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 38,236us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 32,151us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic 25,659us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Operating Segment | Environmental Services                      
Reconciliation of adjusted EBITDA to Net Income                      
Adjusted EBITDA                 115,214ecol_AdjustedEbitda
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= ecol_EnvironmentalServicesSegmentMember
84,547ecol_AdjustedEbitda
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= ecol_EnvironmentalServicesSegmentMember
71,556ecol_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                 16,572ecol_AdjustedEbitda
/ us-gaap_ConsolidationItemsAxis
= us-gaap_OperatingSegmentsMember
/ us-gaap_StatementBusinessSegmentsAxis
= ecol_FieldAndIndustrialServicesSegmentMember
   
Corporate                      
Reconciliation of adjusted EBITDA to Net Income                      
Adjusted EBITDA                 $ (22,810)ecol_AdjustedEbitda
/ us-gaap_ConsolidationItemsAxis
= us-gaap_CorporateNonSegmentMember
$ (13,361)ecol_AdjustedEbitda
/ us-gaap_ConsolidationItemsAxis
= us-gaap_CorporateNonSegmentMember
$ (13,204)ecol_AdjustedEbitda
/ us-gaap_ConsolidationItemsAxis
= us-gaap_CorporateNonSegmentMember