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DEBT (Details) (USD $)
0 Months Ended 12 Months Ended
Jun. 17, 2014
Dec. 31, 2014
Future maturities of long-term debt, excluding the net discount    
2015   $ 3,976,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths
2016   3,976,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo
2017   3,976,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree
2018   3,976,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour
2019   3,976,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive
Thereafter   375,736,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive
Total   395,616,000us-gaap_DebtInstrumentCarryingAmount
Long-term debt    
Term loan   395,616,000us-gaap_DebtInstrumentCarryingAmount
Net discount on term loan   (963,000)us-gaap_DebtInstrumentUnamortizedDiscount
Total debt   394,653,000us-gaap_LongTermDebt
Current portion of long-term debt   (3,828,000)us-gaap_LongTermDebtCurrent
Long-term debt   390,825,000us-gaap_LongTermDebtNoncurrent
June 30, 2014 through September 30, 2015    
Long-term debt    
Maximum consolidated senior secured leverage ratio   4.00ecol_DebtInstrumentCovenantMaximumConsolidatedSeniorSecuredLeverageRatio
/ ecol_DebtInstrumentPeriodAxis
= ecol_DebtInstrumentPeriodOneMember
December 31, 2015 through September 30, 2016    
Long-term debt    
Maximum consolidated senior secured leverage ratio   3.75ecol_DebtInstrumentCovenantMaximumConsolidatedSeniorSecuredLeverageRatio
/ ecol_DebtInstrumentPeriodAxis
= ecol_DebtInstrumentPeriodTwoMember
December 31, 2016 through September 30, 2017    
Long-term debt    
Maximum consolidated senior secured leverage ratio   3.50ecol_DebtInstrumentCovenantMaximumConsolidatedSeniorSecuredLeverageRatio
/ ecol_DebtInstrumentPeriodAxis
= ecol_DebtInstrumentPeriodThreeMember
December 31, 2017 through September 30, 2018    
Long-term debt    
Maximum consolidated senior secured leverage ratio   3.25ecol_DebtInstrumentCovenantMaximumConsolidatedSeniorSecuredLeverageRatio
/ ecol_DebtInstrumentPeriodAxis
= ecol_DebtInstrumentPeriodFourMember
December 31, 2018 and thereafter    
Long-term debt    
Maximum consolidated senior secured leverage ratio   3.00ecol_DebtInstrumentCovenantMaximumConsolidatedSeniorSecuredLeverageRatio
/ ecol_DebtInstrumentPeriodAxis
= ecol_DebtInstrumentPeriodFiveMember
Credit Agreement    
Long-term debt    
Period after closing of the credit agreement considered for calculation of prepayment premium 6 months  
Mandatory prepayments as a percentage of adjusted excess cash flow if entity's total leverage ratio is greater than the specified leverage ratio 50.00%ecol_DebtInstrumentCovenantMandatoryPrepaymentsAsPercentageOfAdjustedExcessCashFlowIfTotalLeverageRatioIsGreaterThanSpecifiedLeverageRatio
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember
 
Total leverage ratio 2.50ecol_DebtInstrumentCovenantTotalLeverageRatio
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember
 
Mandatory prepayments as a percentage of adjusted excess cash flow if entity's total leverage ratio is equal to or less than the specified leverage ratio 0.00%ecol_DebtInstrumentCovenantMandatoryPrepaymentsAsPercentageOfAdjustedExcessCashFlowIfTotalLeverageRatioIsEqualToSpecifiedLeverageRatio
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember
 
Credit Agreement | EQ    
Long-term debt    
Maximum borrowing capacity 540,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_BusinessAcquisitionAxis
= ecol_TheEnvironmentalQualityCompanyMember
/ us-gaap_CreditFacilityAxis
= us-gaap_LineOfCreditMember
 
Term Loan    
Long-term debt    
Debt instrument, aggregate annual amortization as a percentage of original principal amount 1.00%ecol_DebtInstrumentAnnualAmortizationAsPercentageOfOriginalPrincipalAmount
/ us-gaap_CreditFacilityAxis
= us-gaap_SecuredDebtMember
 
Effective interest rate (as a percent)   3.75%us-gaap_LineOfCreditFacilityInterestRateAtPeriodEnd
/ us-gaap_CreditFacilityAxis
= us-gaap_SecuredDebtMember
Percentage of principal amount of debt instrument for which the Company is required to enter into one or more interest rate hedge agreements   63.00%us-gaap_PercentageOfDebtHedgedByInterestRateDerivatives
/ us-gaap_CreditFacilityAxis
= us-gaap_SecuredDebtMember
Amount of debt hedged   250,000,000ecol_AmountOfDebtHedgedByInterestRateDerivatives
/ us-gaap_CreditFacilityAxis
= us-gaap_SecuredDebtMember
Prepayment premium (as a percent) 1.00%ecol_DebtInstrumentCovenantPrepaymentPremiumPercentage
/ us-gaap_CreditFacilityAxis
= us-gaap_SecuredDebtMember
 
Term Loan | Minimum    
Long-term debt    
Percentage of principal amount of debt instrument for which the Company is required to enter into one or more interest rate hedge agreements 50.00%us-gaap_PercentageOfDebtHedgedByInterestRateDerivatives
/ us-gaap_CreditFacilityAxis
= us-gaap_SecuredDebtMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
 
Term Loan | LIBOR    
Long-term debt    
Percentage points added to the reference rate 3.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_CreditFacilityAxis
= us-gaap_SecuredDebtMember
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember
 
Term Loan | EQ    
Long-term debt    
Maximum borrowing capacity 415,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_BusinessAcquisitionAxis
= ecol_TheEnvironmentalQualityCompanyMember
/ us-gaap_CreditFacilityAxis
= us-gaap_SecuredDebtMember
 
Percentage of outstanding shares acquired 100.00%us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
/ us-gaap_BusinessAcquisitionAxis
= ecol_TheEnvironmentalQualityCompanyMember
/ us-gaap_CreditFacilityAxis
= us-gaap_SecuredDebtMember
 
Term Loan | EQ | Base rate    
Long-term debt    
Percentage points added to the reference rate 2.00%us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
/ us-gaap_BusinessAcquisitionAxis
= ecol_TheEnvironmentalQualityCompanyMember
/ us-gaap_CreditFacilityAxis
= us-gaap_SecuredDebtMember
/ us-gaap_VariableRateAxis
= us-gaap_BaseRateMember
 
Revolving Line of Credit    
Long-term debt    
Maximum borrowing capacity 125,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
 
Amount outstanding   0us-gaap_LineOfCredit
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
Early termination penalties incurred 0ecol_DebtInstrumentEarlyTerminationPenalties
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
 
Commitment fee (as a percent) 0.50%us-gaap_LineOfCreditFacilityCommitmentFeePercentage
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
 
Availability for borrowings under line of credit   89,100,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
Line of credit issued in the form of a standby letters of credit   35,900,000us-gaap_LettersOfCreditOutstandingAmount
/ us-gaap_CreditFacilityAxis
= us-gaap_RevolvingCreditFacilityMember
Letter of credit    
Long-term debt    
Maximum borrowing capacity 50,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_LetterOfCreditMember