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SIGNIFICANT ACCOUNTING POLICIES (Credit Concentration) (Details)
Dec. 31, 2013
Dec. 31, 2012
Accounts receivable    
Restricted Cash and Cash Equivalents Items [Line Items]    
Concentration risk major customers over benchmark 10.00%clh_ConcentrationRiskMajorCustomersOverBenchmark
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_AccountsReceivableMember		  
Sales    
Restricted Cash and Cash Equivalents Items [Line Items]    
Concentration risk major customers over benchmark 10.00%clh_ConcentrationRiskMajorCustomersOverBenchmark
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesMember		 10.00%clh_ConcentrationRiskMajorCustomersOverBenchmark
/ us-gaap_ConcentrationRiskByBenchmarkAxis
= us-gaap_SalesMember