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OTHER ITEMS AND CHARGES (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Site Contingency [Line Items]
Expense from acquisition activities	$ 414	$ 1,009
Southbridge Landfill closure charge	157	613
Southbridge Landfill
Site Contingency [Line Items]
Southbridge Landfill closure charge	$ 157	$ 613

X

- Definition

The aggregate amount of expense associated with legal, consulting and other similar costs recognized during the accounting period associated with the acquisition and integration of acquired businesses or select development projects

+ References

No definition available.

+ Details

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

X

- Definition

The aggregate (recovery) charge recognized in the period associated with the unplanned closure of the Southbridge Landfill. (Recovery) charges are expected to be incurred through completion of the closure process

+ References

No definition available.

+ Details

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

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_EnvironmentalRemediationSiteAxis=cwst_SouthbridgeLandfillMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: