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SIGNIFICANT ACCOUNTING POLICIES (Property, Plant and Equipment) (Details) | 12 Months Ended
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Dec. 31, 2018
Minimum | Buildings |
Property, Plant and Equipment [Line Items] |
Weighted average remaining useful life (in years) | 20 years
Minimum | Leasehold and building improvements |
Property, Plant and Equipment [Line Items] |
Weighted average remaining useful life (in years) | 2 years
Minimum | Camp and lodging equipment |
Property, Plant and Equipment [Line Items] |
Weighted average remaining useful life (in years) | 8 years
Minimum | Vehicles |
Property, Plant and Equipment [Line Items] |
Weighted average remaining useful life (in years) | 2 years
Minimum | Capitalized software and computer equipment |
Property, Plant and Equipment [Line Items] |
Weighted average remaining useful life (in years) | 3 years
Minimum | Containers and railcars |
Property, Plant and Equipment [Line Items] |
Weighted average remaining useful life (in years) | 8 years
Minimum | All other equipment |
Property, Plant and Equipment [Line Items] |
Weighted average remaining useful life (in years) | 4 years
Minimum | Furniture and fixtures |
Property, Plant and Equipment [Line Items] |
Weighted average remaining useful life (in years) | 5 years
Maximum | Buildings |
Property, Plant and Equipment [Line Items] |
Weighted average remaining useful life (in years) | 42 years
Maximum | Leasehold and building improvements |
Property, Plant and Equipment [Line Items] |
Weighted average remaining useful life (in years) | 45 years
Maximum | Camp and lodging equipment |
Property, Plant and Equipment [Line Items] |
Weighted average remaining useful life (in years) | 15 years
Maximum | Vehicles |
Property, Plant and Equipment [Line Items] |
Weighted average remaining useful life (in years) | 15 years
Maximum | Capitalized software and computer equipment |
Property, Plant and Equipment [Line Items] |
Weighted average remaining useful life (in years) | 5 years
Maximum | Containers and railcars |
Property, Plant and Equipment [Line Items] |
Weighted average remaining useful life (in years) | 16 years
Maximum | All other equipment |
Property, Plant and Equipment [Line Items] |
Weighted average remaining useful life (in years) | 30 years
Maximum | Furniture and fixtures |
Property, Plant and Equipment [Line Items] |
Weighted average remaining useful life (in years) | 8 years

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_PropertyPlantAndEquipmentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
Name: | us-gaap_PropertyPlantAndEquipmentUsefulLife
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_BuildingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_LandBuildingsAndImprovementsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=clh_CampEquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_VehiclesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_ComputerEquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_RailroadTransportationEquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=clh_AllOtherEquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_FurnitureAndFixturesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |