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v3.21.2

REVENUES - Additional Information (Details) | 9 Months Ended
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Sep. 30, 2021 source
Disaggregation of Revenue [Line Items] |
Deferred contract cost, recognition period | 3 months
Environmental Services |
Disaggregation of Revenue [Line Items] |
Number of revenue sources | 4
Safety-Kleen Sustainability Solutions |
Disaggregation of Revenue [Line Items] |
Number of revenue sources | 2

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- Definition Deferred Contract Cost, Recognition Period + References No definition available. + Details
Name: | clh_DeferredContractCostRecognitionPeriod
Namespace Prefix: | clh_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Number Of Revenue Sources + References No definition available. + Details
Name: | clh_NumberOfRevenueSources
Namespace Prefix: | clh_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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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_DisaggregationOfRevenueLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=clh_EnvironmentalServicesSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=clh_SafetyKleenSustainabilitySolutionsSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |