XML 65 R42.htm IDEA: XBRL DOCUMENT
v3.20.1

REVENUES - Narrative (Details) | 3 Months Ended
--- | ---
Mar. 31, 2020
Revenue from Contract with Customer [Abstract] |
Contract liability, recognition period | 3 months

X
- Definition Contract With Customer, Liability, Recognition In Subsequent Period + References No definition available. + Details
Name: | clh_ContractWithCustomerLiabilityRecognitionInSubsequentPeriod
Namespace Prefix: | clh_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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