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INCOME TAXES - Additional Information (Details) $ in Millions	12 Months Ended
	Dec. 31, 2024 USD ($)
Income Tax Disclosure [Abstract]
Expiration of tax credits	$ 4.1

X

- Definition

Tax Credits Carryforward, Expiration, Amount

+ References

No definition available.

+ Details

Name:	clh_TaxCreditsCarryforwardExpirationAmount
Namespace Prefix:	clh_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_IncomeTaxDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration