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LEASES (Supplemental Finance Lease Balance Sheet information) (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
ROU assets: |  |
Finance lease (included in property, plant and equipment, net) | $ 60,271 | $ 32,307
Current portion of lease liabilities: |  |
Finance lease (included in accrued expenses) | $ 5,840 | $ 801
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List] | us-gaap:AccruedLiabilitiesCurrent | us-gaap:AccruedLiabilitiesCurrent
Long-term portion of lease liabilities: |  |
Finance lease (included in deferred taxes, unrecognized tax benefits and other long-term liabilities) | $ 55,038 | $ 34,517
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] | us-gaap:OtherLiabilitiesNoncurrent | us-gaap:OtherLiabilitiesNoncurrent

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- Definition Lease, Liability, Current [Abstract] + References No definition available. + Details
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Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Lease, Liability, Noncurrent [Abstract] + References No definition available. + Details
Name: | clh_LeaseLiabilityNoncurrentAbstract
Namespace Prefix: | clh_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition ROU Assets [Abstract] + References No definition available. + Details
Name: | clh_ROUAssetsAbstract
Namespace Prefix: | clh_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Present value of lessee's discounted obligation for lease payments from finance lease, classified as current. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918627-209977 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Indicates line item in statement of financial position that includes current finance lease liability. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918631-209977 + Details
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Balance Type: | na
Period Type: | instant

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- Definition Present value of lessee's discounted obligation for lease payments from finance lease, classified as noncurrent. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918627-209977 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Indicates line item in statement of financial position that includes noncurrent finance lease liability. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918631-209977 + Details
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- Definition Amount, after accumulated amortization, of right-of-use asset from finance lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918627-209977 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | debit
Period Type: | instant