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EQUITY (Details 3) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Share-Based Compensation Expense      
Total share-based compensation $ 1,250,000us-gaap_AllocatedShareBasedCompensationExpense $ 865,000us-gaap_AllocatedShareBasedCompensationExpense $ 846,000us-gaap_AllocatedShareBasedCompensationExpense
Income tax benefit (467,000)us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense (310,000)us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense (326,000)us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
Share-based compensation, net of tax 783,000us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax 555,000us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax 520,000us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax
Unrecognized Share-Based Compensation Expense      
Unrecognized compensation expense related to unvested share-based awards granted 2,400,000us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized    
Weighted average remaining vesting period over which expense is expected to be recognized 2 years    
Stock options      
Share-Based Compensation Expense      
Total share-based compensation 442,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= ecol_EmployeeAndDirectorsStockOptionsMember
346,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= ecol_EmployeeAndDirectorsStockOptionsMember
397,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= ecol_EmployeeAndDirectorsStockOptionsMember
Restricted stock      
Share-Based Compensation Expense      
Total share-based compensation $ 808,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
$ 519,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
$ 449,000us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember