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COMMITMENTS AND CONTINGENCIES (Superfund Proceedings) (Details) | 12 Months Ended
--- | ---
Dec. 31, 2017 USD ($) site
Superfund Proceedings |
Number of sites owned by the entity subject to proceedings under federal or state superfund laws | 129
Superfund Proceedings |
Superfund Proceedings |
Number of sites subject to proceedings under federal or state superfund laws | 129
Number of sites owned by the entity subject to proceedings under federal or state superfund laws | 3
Number of sites owned by third parties subject to proceedings under federal or state superfund laws | 126
Number of sites for which environmental remediation expense is settled | 33
Third party sites requiring expenditure on remediation | 16
Number of sites for which environmental remediation expense is not required | 77
Possible increase in legal and administrative proceedings | $ | $ 100,000
Number of sites which potential liability could exceed $100,000 | 11
Notices received from owners of third party sites seeking indemnification from the company | 6
Certain other third party sites |
Superfund Proceedings |
Indemnification agreement with third party sites, sites | 11
Safety-Kleen |
Superfund Proceedings |
Notices received from owners of third party sites seeking indemnification from the company | 17

X
- Definition The amount as of the balance sheet date of potential needed increase in the loss contingency reserves. + References No definition available. + Details
Name: | clh_LossContingencyAccrualAtCarryingValuePotentialAdditionalLiability
Namespace Prefix: | clh_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Number of Sites, Potential Liability Exceeds Substantial Quota + References No definition available. + Details
Name: | clh_NumberofSitesPotentialLiabilityExceedsSubstantialQuota
Namespace Prefix: | clh_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of sites for which environmental remediation expense is incurred subject to proceedings under federal or state superfund laws owned by third party. + References No definition available. + Details
Name: | clh_SiteContingencyEnvironmentalRemediationExpenseNumberOfSitesOwnedByThirdParty
Namespace Prefix: | clh_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of sites owned by the third party for which environmental remediation expense is settled. + References No definition available. + Details
Name: | clh_SiteContingencyEnvironmentalRemediationExpenseSettledNumberOfSitesOwnedByThirdParty
Namespace Prefix: | clh_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of sites for which the company has an indemnification agreement from the third party seller. + References No definition available. + Details
Name: | clh_SiteContingencyIndemnificationAgreementNumberOfSitesOwnedByThirdParty
Namespace Prefix: | clh_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of sites owned by the third party for which environmental remediation expense is not required. + References No definition available. + Details
Name: | clh_SiteContingencyNotRequiringEnvironmentalRemediationExpenseNumberOfSitesOwnedByThirdParty
Namespace Prefix: | clh_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of notices received from owners of third party sites related to the CSD assets seeking indemnification from the company. + References No definition available. + Details
Name: | clh_SiteContingencyNoticeReceivedNumberOfSitesOwnedByThirdParty
Namespace Prefix: | clh_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of sites that are subject to proceedings under federal or state superfund laws brought against the company or against third parties for which the company may have certain indemnification obligations. + References No definition available. + Details
Name: | clh_SiteContingencyNumberOfSites
Namespace Prefix: | clh_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of sites that are subject to proceedings under federal or state superfund laws that are owned by the entity. + References No definition available. + Details
Name: | clh_SiteContingencyNumberOfSitesOwnedByEntity
Namespace Prefix: | clh_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of sites owned by third parties subject to proceedings under federal or state Superfund laws for which the company or the prior owners shipped wastes. + References No definition available. + Details
Name: | clh_SiteContingencyNumberOfSitesOwnedByThirdParty
Namespace Prefix: | clh_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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

X
- Details
Name: | clh_ContingenciesByNatureOfContingencyAxis=clh_SuperfundProceedingsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | clh_ContingenciesByNatureOfContingencyAxis=clh_CertainOtherThirdPartySitesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | clh_ContingenciesByNatureOfContingencyAxis=clh_SafetyKleenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |