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DEBT - Debt Modification Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Debt And Derivatives Disclosure [Abstract]
Debt modification expense	$ 1,396	$ 0	$ 0

X

- Definition

Debt And Derivatives Disclosure [Abstract]

+ References

No definition available.

+ Details

Name:	cwst_DebtAndDerivativesDisclosureAbstract
Namespace Prefix:	cwst_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Definition

Third-party expense related to debt modification.

+ References

No definition available.

+ Details

Name:	cwst_DebtModificationExpense
Namespace Prefix:	cwst_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration