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PROPERTY, PLANT AND EQUIPMENT (Details) (USD $)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, gross $ 2,533,988,000us-gaap_PropertyPlantAndEquipmentGross   $ 2,564,340,000us-gaap_PropertyPlantAndEquipmentGross
Less - accumulated depreciation and amortization 1,031,491,000us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment   1,005,506,000us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
Total property, plant and equipment, net 1,502,497,000us-gaap_PropertyPlantAndEquipmentNet   1,558,834,000us-gaap_PropertyPlantAndEquipmentNet
Interest capitalized to fixed assets 200,000us-gaap_AccumulatedCapitalizedInterestCosts 0us-gaap_AccumulatedCapitalizedInterestCosts  
Depreciation inclusive of amortization 57,400,000clh_DepreciationInclusiveofAmortization 59,900,000clh_DepreciationInclusiveofAmortization  
Land      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, gross 97,742,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LandMember
  98,507,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LandMember
Asset retirement costs (non-landfill)      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, gross 10,812,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_AssetRetirementObligationCostsMember
  10,871,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_AssetRetirementObligationCostsMember
Landfill assets      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, gross 116,889,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LandfillMember
  110,984,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_LandfillMember
Buildings and improvements      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, gross 334,282,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingAndBuildingImprovementsMember
  338,242,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_BuildingAndBuildingImprovementsMember
Camp equipment      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, gross 163,434,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= clh_CampEquipmentMember
  180,575,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= clh_CampEquipmentMember
Vehicles      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, gross 468,862,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_VehiclesMember
  471,615,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_VehiclesMember
Equipment      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, gross 1,283,502,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_EquipmentMember
  1,302,424,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_EquipmentMember
Furniture and fixtures      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, gross 5,379,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_FurnitureAndFixturesMember
  5,517,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_FurnitureAndFixturesMember
Construction in progress      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment, gross $ 53,086,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ConstructionInProgressMember
  $ 45,605,000us-gaap_PropertyPlantAndEquipmentGross
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= us-gaap_ConstructionInProgressMember