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GUARANTOR AND NON-GUARANTOR SUBSIDIARIES (Narrative) (Details) | 12 Months Ended
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Dec. 31, 2018
Guarantor and Non-Guarantor Subsidiaries Financial Information [Abstract] |
Guarantor, ownership interest by Clean Harbors, Inc. | 100.00%

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- 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