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PROPERTY, PLANT AND EQUIPMENT (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Property, Plant and Equipment [Abstract] |  |
Depreciation expense, inclusive of landfill and finance lease amortization | $ 64.6 | $ 65.4

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- Definition Depreciation Expense, Inclusive Of Landfill And Finance Lease Amortization + References No definition available. + Details
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Namespace Prefix: | clh_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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