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GUARANTOR AND NON-GUARANTOR SUBSIDIARIES FINANCIAL INFORMATION (Narrative) (Details) | 9 Months Ended
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Sep. 30, 2018
Guarantor and Non-Guarantor Subsidiaries Financial Information [Abstract] |
Ownership percentage of U.S. guarantor subsidiaries | 100.00%

X
- Definition -- None. No documentation exists for this element. -- + References No definition available. + Details
Name: | clh_GuarantorAndNonGuarantorSubsidiariesFinancialInformationAbstract
Namespace Prefix: | clh_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Percentage of subsidiary's or equity method investee's stock owned by parent immediately after all stock transactions. + References No definition available. + Details
Name: | us-gaap_SubsidiaryOrEquityMethodInvesteeCumulativePercentageOwnershipAfterAllTransactions
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration