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ACCRUED EXPENSES AND OTHER CURRENT LIABILITIES - Additional Information (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Payables and Accruals [Abstract] |  |
Accrued insurance, employee medical insurance costs | $ 23.9 | $ 22.8
Accrual loss for workers' compensation, comprehensive general liability and vehicle liability self-insurance programs | $ 83.7 | $ 82.7

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- Definition Accrual For Workers' Compensation, Comprehensive General Liability And Vehicle Liability Self-insurance Programs + References No definition available. + Details
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Namespace Prefix: | clh_
Data Type: | xbrli:monetaryItemType
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- Definition Accrued Insurance, Employee Medical Insurance Costs + References No definition available. + Details
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Namespace Prefix: | clh_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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