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OTHER ITEMS AND CHARGES (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Unusual or Infrequent Items, or Both [Abstract] |  |  |  |
Expense from acquisition activities | $ 816 | $ 1,904 | $ 3,878 | $ 3,950
Environmental remediation charge | $ 759 | $ 0 | $ 759 | $ 0

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

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- Definition The charge against earnings in the period for known or estimated future costs arising from requirements to perform environmental remediation activities. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 55 -Paragraph 11 -URI https://asc.fasb.org/extlink&oid=6571209&loc=d3e13644-110860 Reference 2: http://www.xbrl.org/2003/role/recommendedDisclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 45 -Paragraph 4 -URI https://asc.fasb.org/extlink&oid=109237650&loc=d3e13064-110858 Reference 3: http://www.xbrl.org/2003/role/recommendedDisclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 12 -Subparagraph (a) -URI https://asc.fasb.org/extlink&oid=6393242&loc=d3e13296-110859 + Details
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Balance Type: | debit
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- References No definition available. + Details
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