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v3.21.1

CLOSURE AND POST-CLOSURE LIABILITIES (Narrative) (Details) | 3 Months Ended
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Mar. 31, 2021
Asset Retirement Obligation Disclosure [Abstract] |
Credit-adjusted risk-free rate | 4.84%

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- Definition Asset Retirement Obligations Discount Rate + References No definition available. + Details
Name: | clh_AssetRetirementObligationsDiscountRate
Namespace Prefix: | clh_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_AssetRetirementObligationDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration