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SUBSEQUENT EVENTS Subsequent Events (Details) (Subsequent Event, Thermo Fluids Inc., USD $)
In Millions, unless otherwise specified
0 Months Ended
Feb. 04, 2015
Subsequent Event | Thermo Fluids Inc.
 
Business Acquisition [Line Items]  
Payments to acquire businesses, gross $ 85.0us-gaap_PaymentsToAcquireBusinessesGross
/ us-gaap_BusinessAcquisitionAxis
= clh_ThermoFluidsInc.Member
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember