XML 97 R83.htm IDEA: XBRL DOCUMENT
v3.20.4

INCOME TAXES (Valuation Allowance) (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Income Tax Disclosure [Abstract] |  |
Valuation allowance, foreign tax credits | $ 14,127 | $ 16,565
Valuation allowance, acquired federal net operating losses | 779 | 779
Valuation allowance, state net operating loss carryforwards | 10,429 | 10,663
Valuation allowance, foreign net operating loss carryforwards | 29,839 | 34,149
Valuation allowance, deferred tax assets of a Canadian subsidiary | 11,468 | 14,922
Valuation allowance, realized and unrealized capital losses | 10,402 | 6,565
Valuation allowance | $ 77,044 | $ 83,643

X
- Definition Deferred Tax Assets, Valuation Allowance, Acquired Federal Net Operating Losses + References No definition available. + Details
Name: | clh_DeferredTaxAssetsValuationAllowanceAcquiredFederalNetOperatingLosses
Namespace Prefix: | clh_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Deferred Tax Assets, Valuation Allowance, Deferred Tax Assets Of Subsidiary + References No definition available. + Details
Name: | clh_DeferredTaxAssetsValuationAllowanceDeferredTaxAssetsOfSubsidiary
Namespace Prefix: | clh_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Deferred Tax Assets, Valuation Allowance, Foreign Net Operating Loss Carryforwards + References No definition available. + Details
Name: | clh_DeferredTaxAssetsValuationAllowanceForeignNetOperatingLossCarryforwards
Namespace Prefix: | clh_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Deferred Tax Assets, Valuation Allowance, Foreign Tax Credits + References No definition available. + Details
Name: | clh_DeferredTaxAssetsValuationAllowanceForeignTaxCredits
Namespace Prefix: | clh_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Deferred Tax Assets, Valuation Allowance, Realized And Unrealized Capital Losses + References No definition available. + Details
Name: | clh_DeferredTaxAssetsValuationAllowanceRealizedAndUnrealizedCapitalLosses
Namespace Prefix: | clh_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Deferred Tax Assets, Valuation Allowance, State Net Operating Loss Carryforwards + References No definition available. + Details
Name: | clh_DeferredTaxAssetsValuationAllowanceStateNetOperatingLossCarryforwards
Namespace Prefix: | clh_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
Name: | us-gaap_DeferredTaxAssetsValuationAllowance
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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