$CLH
CLEAN HARBORS INC Stock $clh

$clh Overview Financials Valuation SEC Filings Company Website

2019 Q4 Form 10-K Financial Statement

#000082281821000003 Filed on February 24, 2021

Income Statement

Concept	2019 Q4	2018 Q4	2018
Revenue	$871.0M	$858.2M	$3.300B
YoY Change	1.49%	14.82%	12.07%
Cost Of Revenue	$615.8M	$594.9M	$2.306B
YoY Change	3.52%	12.94%	11.77%
Gross Profit	$255.2M	$263.3M	$994.8M
YoY Change	-3.08%	19.32%	12.74%
Gross Profit Margin	29.3%	30.69%	30.14%
Selling, General & Admin	$123.0M	$141.4M	$503.7M
YoY Change	-13.01%	18.92%	10.31%
% of Gross Profit	48.19%	53.69%	50.64%
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$77.40M	$77.90M	$298.6M
YoY Change	-0.64%	8.95%	3.54%
% of Gross Profit	30.32%	29.58%	30.02%
Operating Expenses	$202.9M	$221.8M	$503.7M
YoY Change	-8.52%	15.04%	10.31%
Operating Profit	$52.31M	$41.49M	$182.6M
YoY Change	26.09%	48.51%	42.89%
Interest Expense	-$19.00M	-$20.10M	-$81.09M
YoY Change	-5.47%	0.0%	-5.48%
% of Operating Profit	-36.32%	-48.45%	-44.42%
Other Income/Expense, Net	$905.0K	-$4.061M	-$4.510M
YoY Change	-122.29%	22.87%	-26.3%
Pretax Income	$34.90M	$17.30M	$115.1M
YoY Change	101.73%	367.57%	13.13%
Income Tax	$10.70M	$1.100M	$28.85M
% Of Pretax Income	30.66%	6.36%	25.07%
Net Earnings	$24.15M	$16.43M	$65.64M
YoY Change	46.98%	-80.48%	-34.85%
Net Earnings / Revenue	2.77%	1.91%	1.99%
Basic Earnings Per Share	$0.43	$0.29	$1.17
Diluted Earnings Per Share	$0.43	$0.29	$1.16
COMMON SHARES
Basic Shares Outstanding	55.81M shares	56.01M shares	56.15M shares
Diluted Shares Outstanding			56.34M shares

Balance Sheet

Concept	2019 Q4	2018 Q4	2018
SHORT-TERM ASSETS
Cash & Short-Term Investments	$414.4M	$279.4M	$279.4M
YoY Change	48.32%	-21.87%	-21.87%
Cash & Equivalents	$372.0M	$226.5M	$226.5M
Short-Term Investments	$42.42M	$52.90M	$52.90M
Other Short-Term Assets	$70.60M	$315.8M	$61.60M
YoY Change	-77.65%	18.05%	10.79%
Inventory	$214.7M	$199.5M	$199.5M
Prepaid Expenses
Receivables	$644.7M	$607.0M	$661.7M
Other Receivables	$0.00	$0.00	$0.00
Total Short-Term Assets	$1.401B	$1.202B	$1.202B
YoY Change	16.53%	4.17%	4.17%
LONG-TERM ASSETS
Property, Plant & Equipment	$1.588B	$1.562B	$1.562B
YoY Change	1.68%	-1.6%	-1.6%
Goodwill	$525.0M	$514.2M
YoY Change	2.11%	7.45%
Intangibles	$419.1M	$441.9M
YoY Change	-5.16%	-5.81%
Long-Term Investments
YoY Change
Other Assets	$13.56M	$18.12M	$18.10M
YoY Change	-25.17%	3.56%	3.43%
Total Long-Term Assets	$2.708B	$2.536B	$2.536B
YoY Change	6.78%	-0.64%	-0.64%
TOTAL ASSETS
Total Short-Term Assets	$1.401B	$1.202B	$1.202B
Total Long-Term Assets	$2.708B	$2.536B	$2.536B
Total Assets	$4.109B	$3.738B	$3.738B
YoY Change	9.91%	0.86%	0.86%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$298.4M	$276.5M	$276.5M
YoY Change	7.93%	23.29%	23.33%
Accrued Expenses	$276.5M	$233.4M	$233.4M
YoY Change	18.48%	24.16%	24.15%
Deferred Revenue	$73.37M	$61.84M
YoY Change	18.64%	-8.82%
Short-Term Debt	$0.00	$0.00	$0.00
YoY Change
Long-Term Debt Due	$7.535M	$7.535M	$7.500M
YoY Change	0.0%	88.38%	87.5%
Total Short-Term Liabilities	$720.1M	$602.3M	$602.3M
YoY Change	19.56%	19.54%	19.55%
LONG-TERM LIABILITIES
Long-Term Debt	$1.554B	$1.565B	$1.565B
YoY Change	-0.7%	-3.72%	-3.72%
Other Long-Term Liabilities	$46.00M	$167.9M	$167.9M
YoY Change	-72.61%	1.33%	1.33%
Total Long-Term Liabilities	$2.119B	$1.966B	$1.733B
YoY Change	7.77%	-2.4%	-3.25%
TOTAL LIABILITIES
Total Short-Term Liabilities	$720.1M	$602.3M	$602.3M
Total Long-Term Liabilities	$2.119B	$1.966B	$1.733B
Total Liabilities	$2.839B	$2.569B	$2.569B
YoY Change	10.53%	1.99%	1.99%
SHAREHOLDERS EQUITY
Retained Earnings	$834.9M	$737.2M
YoY Change	13.26%	9.52%
Common Stock	$645.0M	$656.0M
YoY Change	-1.68%	-4.59%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares
Shareholders Equity	$1.270B	$1.170B	$1.170B
YoY Change
Total Liabilities & Shareholders Equity	$4.109B	$3.738B	$3.738B
YoY Change	9.91%	0.86%	0.86%

Cashflow Statement

Concept	2019 Q4	2018 Q4	2018
OPERATING ACTIVITIES
Net Income	$24.15M	$16.43M	$65.64M
YoY Change	46.98%	-80.48%	-34.85%
Depreciation, Depletion And Amortization	$77.40M	$77.90M	$298.6M
YoY Change	-0.64%	8.95%	3.54%
Cash From Operating Activities	$128.5M	$126.0M	$373.2M
YoY Change	1.98%	96.26%	30.63%
INVESTING ACTIVITIES
Capital Expenditures	-$42.80M	-$43.80M	$193.3M
YoY Change	-2.28%	10.89%	15.77%
Acquisitions			$151.0M
YoY Change			206.79%
Other Investing Activities	$12.10M	-$6.300M	-$151.6M
YoY Change	-292.06%	-85.11%	338.15%
Cash From Investing Activities	-$30.80M	-$50.20M	-$349.7M
YoY Change	-38.65%	-38.71%	72.02%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net			$45.08M
YoY Change			-7.95%
Debt Paid & Issued, Net			$405.8M
YoY Change			0.94%
Cash From Financing Activities	-9.300M	-60.60M	-$111.0M
YoY Change	-84.65%	156.78%	52.55%
NET CHANGE
Cash From Operating Activities	128.5M	126.0M	$373.2M
Cash From Investing Activities	-30.80M	-50.20M	-$349.7M
Cash From Financing Activities	-9.300M	-60.60M	-$111.0M
Net Change In Cash	88.40M	15.20M	-$92.89M
YoY Change	481.58%	-136.8%	-849.01%
FREE CASH FLOW
Cash From Operating Activities	$128.5M	$126.0M	$373.2M
Capital Expenditures	-$42.80M	-$43.80M	$193.3M
Free Cash Flow	$171.3M	$169.8M	$179.9M
YoY Change	0.88%	63.74%	51.54%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2020	dei	Entity Central Index Key EntityCentralIndexKey	0000822818
CY2020	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2020
CY2020	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2020	dei	Amendment Flag AmendmentFlag	false
CY2020	clh	Finance Lease Cost FinanceLeaseCost	6489000	USD
CY2019Q4	us-gaap	Finance Lease Liability Noncurrent Statement Of Financial Position Extensible List FinanceLeaseLiabilityNoncurrentStatementOfFinancialPositionExtensibleList	us-gaap:OtherLiabilitiesNoncurrent
CY2020Q4	us-gaap	Finance Lease Liability Noncurrent Statement Of Financial Position Extensible List FinanceLeaseLiabilityNoncurrentStatementOfFinancialPositionExtensibleList	us-gaap:OtherLiabilitiesNoncurrent
CY2020Q4	us-gaap	Finance Lease Liability Current Statement Of Financial Position Extensible List FinanceLeaseLiabilityCurrentStatementOfFinancialPositionExtensibleList	us-gaap:AccruedLiabilitiesCurrent
CY2019Q4	us-gaap	Finance Lease Liability Current Statement Of Financial Position Extensible List FinanceLeaseLiabilityCurrentStatementOfFinancialPositionExtensibleList	us-gaap:AccruedLiabilitiesCurrent
CY2020	dei	Document Type DocumentType	10-K
CY2020	dei	Document Annual Report DocumentAnnualReport	true
CY2020	dei	Document Period End Date DocumentPeriodEndDate	2020-12-31
CY2020	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2020	dei	Document Transition Report DocumentTransitionReport	false
CY2020	dei	Entity File Number EntityFileNumber	001-34223
CY2020	dei	Entity Registrant Name EntityRegistrantName	CLEAN HARBORS, INC
CY2020	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	MA
CY2020	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	04-2997780
CY2020	dei	Entity Address Address Line1 EntityAddressAddressLine1	42 Longwater Drive
CY2020	dei	Entity Address City Or Town EntityAddressCityOrTown	Norwell
CY2020	dei	Entity Address State Or Province EntityAddressStateOrProvince	MA
CY2020	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	02061-9149
CY2020	dei	City Area Code CityAreaCode	781
CY2020	dei	Local Phone Number LocalPhoneNumber	792-5000
CY2020	dei	Security12b Title Security12bTitle	Common Stock, $0.01 par value
CY2020	dei	Trading Symbol TradingSymbol	CLH
CY2020	dei	Security Exchange Name SecurityExchangeName	NYSE
CY2020	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2020	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2020	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2020	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
CY2020	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2020	dei	Entity Small Business EntitySmallBusiness	false
CY2020	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
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CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.74
CY2018	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.16
CY2020	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	55479000	shares
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	55845000	shares
CY2018	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	56148000	shares
CY2020	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	55690000	shares
CY2019	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	56129000	shares
CY2018	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	56340000	shares
CY2020	us-gaap	Net Income Loss NetIncomeLoss	134837000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	97740000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	65636000	USD
CY2020	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-8000	USD
CY2019	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	-120000	USD
CY2018	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax	77000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	0	USD
CY2019	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	-332000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Reclassification Adjustment From Aoci For Sale Of Securities Net Of Tax OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax	0	USD
CY2020	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	-20970000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	-14401000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Before Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax	-9579000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax	-8180000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax	-2335000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Cash Flow Hedge Gain Loss Reclassification After Tax OtherComprehensiveIncomeLossCashFlowHedgeGainLossReclassificationAfterTax	-806000	USD
CY2020	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent	11561000	USD
CY2019	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent	25130000	USD
CY2018	us-gaap	Other Comprehensive Income Foreign Currency Transaction And Translation Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationAdjustmentNetOfTaxPortionAttributableToParent	-42350000	USD
CY2020	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent	189000	USD
CY2019	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent	-44000	USD
CY2018	us-gaap	Other Comprehensive Income Defined Benefit Plans Adjustment Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeDefinedBenefitPlansAdjustmentNetOfTaxPortionAttributableToParent	-82000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-1426000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	13320000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-50964000	USD
CY2020	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	133411000	USD
CY2019	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	111060000	USD
CY2018	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	14672000	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	134837000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	97740000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	65636000	USD
CY2020	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	292915000	USD
CY2019	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	300725000	USD
CY2018	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	298625000	USD
CY2020	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	10133000	USD
CY2019	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	2408000	USD
CY2018	us-gaap	Provision For Doubtful Accounts ProvisionForDoubtfulAccounts	15817000	USD
CY2020	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	3666000	USD
CY2019	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	3809000	USD
CY2018	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	3846000	USD
CY2020	clh	Accretion Of Environmental Liabilities AccretionOfEnvironmentalLiabilities	11051000	USD
CY2019	clh	Accretion Of Environmental Liabilities AccretionOfEnvironmentalLiabilities	10136000	USD
CY2018	clh	Accretion Of Environmental Liabilities AccretionOfEnvironmentalLiabilities	9806000	USD
CY2020	us-gaap	Other Increase Decrease In Environmental Liabilities OtherIncreaseDecreaseInEnvironmentalLiabilities	10698000	USD
CY2019	us-gaap	Other Increase Decrease In Environmental Liabilities OtherIncreaseDecreaseInEnvironmentalLiabilities	-332000	USD
CY2018	us-gaap	Other Increase Decrease In Environmental Liabilities OtherIncreaseDecreaseInEnvironmentalLiabilities	2147000	USD
CY2020	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-9748000	USD
CY2019	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	8005000	USD
CY2018	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	19089000	USD
CY2020	clh	Gain Loss On Sale Of Fixed Assets And Assets Held For Sale GainLossOnSaleOfFixedAssetsAndAssetsHeldForSale	-290000	USD
CY2019	clh	Gain Loss On Sale Of Fixed Assets And Assets Held For Sale GainLossOnSaleOfFixedAssetsAndAssetsHeldForSale	2897000	USD
CY2018	clh	Gain Loss On Sale Of Fixed Assets And Assets Held For Sale GainLossOnSaleOfFixedAssetsAndAssetsHeldForSale	-4510000	USD
CY2020	us-gaap	Share Based Compensation ShareBasedCompensation	18502000	USD
CY2019	us-gaap	Share Based Compensation ShareBasedCompensation	17816000	USD
CY2018	us-gaap	Share Based Compensation ShareBasedCompensation	16792000	USD
CY2020	us-gaap	Gain Loss On Sale Of Business GainLossOnSaleOfBusiness	-3376000	USD
CY2019	us-gaap	Gain Loss On Sale Of Business GainLossOnSaleOfBusiness	687000	USD
CY2018	us-gaap	Gain Loss On Sale Of Business GainLossOnSaleOfBusiness	0	USD
CY2020	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	0	USD
CY2019	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-6131000	USD
CY2018	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-2488000	USD
CY2020	us-gaap	Payments For Environmental Liabilities PaymentsForEnvironmentalLiabilities	12401000	USD
CY2019	us-gaap	Payments For Environmental Liabilities PaymentsForEnvironmentalLiabilities	18701000	USD
CY2018	us-gaap	Payments For Environmental Liabilities PaymentsForEnvironmentalLiabilities	10115000	USD
CY2020	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	-22422000	USD
CY2019	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	33271000	USD
CY2018	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	79563000	USD
CY2020	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	7933000	USD
CY2019	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	15869000	USD
CY2018	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	26958000	USD
CY2020	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	12602000	USD
CY2019	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	14421000	USD
CY2018	us-gaap	Increase Decrease In Other Operating Assets IncreaseDecreaseInOtherOperatingAssets	7946000	USD
CY2020	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	-80328000	USD
CY2019	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	7153000	USD
CY2018	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	46915000	USD
CY2020	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	45719000	USD
CY2019	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	45447000	USD
CY2018	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	12121000	USD
CY2020	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	430597000	USD
CY2019	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	413192000	USD
CY2018	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	373210000	USD
CY2020	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	196256000	USD
CY2019	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	216324000	USD
CY2018	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	193344000	USD
CY2020	clh	Proceeds From Sales Of Fixed Assets And Assets Held For Sale ProceedsFromSalesOfFixedAssetsAndAssetsHeldForSale	9623000	USD
CY2019	clh	Proceeds From Sales Of Fixed Assets And Assets Held For Sale ProceedsFromSalesOfFixedAssetsAndAssetsHeldForSale	11655000	USD
CY2018	clh	Proceeds From Sales Of Fixed Assets And Assets Held For Sale ProceedsFromSalesOfFixedAssetsAndAssetsHeldForSale	15445000	USD
CY2020	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	8839000	USD
CY2019	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	29363000	USD
CY2018	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	151023000	USD
CY2020	us-gaap	Payments To Acquire Intangible Assets PaymentsToAcquireIntangibleAssets	2029000	USD
CY2019	us-gaap	Payments To Acquire Intangible Assets PaymentsToAcquireIntangibleAssets	3904000	USD
CY2018	us-gaap	Payments To Acquire Intangible Assets PaymentsToAcquireIntangibleAssets	4688000	USD
CY2020	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	70891000	USD
CY2019	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	35836000	USD
CY2018	us-gaap	Payments To Acquire Available For Sale Securities Debt PaymentsToAcquireAvailableForSaleSecuritiesDebt	44772000	USD
CY2020	us-gaap	Proceeds From Sale And Maturity Of Available For Sale Securities ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities	61220000	USD
CY2019	us-gaap	Proceeds From Sale And Maturity Of Available For Sale Securities ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities	51202000	USD
CY2018	us-gaap	Proceeds From Sale And Maturity Of Available For Sale Securities ProceedsFromSaleAndMaturityOfAvailableForSaleSecurities	28723000	USD
CY2020	us-gaap	Proceeds From Divestiture Of Businesses ProceedsFromDivestitureOfBusinesses	7712000	USD
CY2019	us-gaap	Proceeds From Divestiture Of Businesses ProceedsFromDivestitureOfBusinesses	4714000	USD
CY2018	us-gaap	Proceeds From Divestiture Of Businesses ProceedsFromDivestitureOfBusinesses	0	USD
CY2020	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-199460000	USD
CY2019	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-217856000	USD
CY2018	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-349659000	USD
CY2020	us-gaap	Increase Decrease In Outstanding Checks Financing Activities IncreaseDecreaseInOutstandingChecksFinancingActivities	5404000	USD
CY2019	us-gaap	Increase Decrease In Outstanding Checks Financing Activities IncreaseDecreaseInOutstandingChecksFinancingActivities	-3705000	USD
CY2018	us-gaap	Increase Decrease In Outstanding Checks Financing Activities IncreaseDecreaseInOutstandingChecksFinancingActivities	132000	USD
CY2020	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	5331000	USD
CY2019	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	7429000	USD
CY2018	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	3266000	USD
CY2020	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	74844000	USD
CY2019	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	21390000	USD
CY2018	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	45080000	USD
CY2020	us-gaap	Payments Of Financing Costs PaymentsOfFinancingCosts	2171000	USD
CY2019	us-gaap	Payments Of Financing Costs PaymentsOfFinancingCosts	10079000	USD
CY2018	us-gaap	Payments Of Financing Costs PaymentsOfFinancingCosts	4027000	USD
CY2020	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	4469000	USD
CY2019	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	586000	USD
CY2018	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	0	USD
CY2020	us-gaap	Payments Of Debt Extinguishment Costs PaymentsOfDebtExtinguishmentCosts	0	USD
CY2019	us-gaap	Payments Of Debt Extinguishment Costs PaymentsOfDebtExtinguishmentCosts	2701000	USD
CY2018	us-gaap	Payments Of Debt Extinguishment Costs PaymentsOfDebtExtinguishmentCosts	1238000	USD
CY2020	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	7535000	USD
CY2019	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	852535000	USD
CY2018	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	405768000	USD
CY2020	us-gaap	Proceeds From Issuance Of Unsecured Debt ProceedsFromIssuanceOfUnsecuredDebt	0	USD
CY2019	us-gaap	Proceeds From Issuance Of Unsecured Debt ProceedsFromIssuanceOfUnsecuredDebt	845000000	USD
CY2018	us-gaap	Proceeds From Issuance Of Unsecured Debt ProceedsFromIssuanceOfUnsecuredDebt	348250000	USD
CY2020	us-gaap	Proceeds From Lines Of Credit ProceedsFromLinesOfCredit	150000000	USD
CY2019	us-gaap	Proceeds From Lines Of Credit ProceedsFromLinesOfCredit	0	USD
CY2018	us-gaap	Proceeds From Lines Of Credit ProceedsFromLinesOfCredit	50000000	USD
CY2020	us-gaap	Repayments Of Lines Of Credit RepaymentsOfLinesOfCredit	150000000	USD
CY2019	us-gaap	Repayments Of Lines Of Credit RepaymentsOfLinesOfCredit	0	USD
CY2018	us-gaap	Repayments Of Lines Of Credit RepaymentsOfLinesOfCredit	50000000	USD
CY2020	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-88946000	USD
CY2019	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-53425000	USD
CY2018	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-110997000	USD
CY2020	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	4919000	USD
CY2019	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	3573000	USD
CY2018	us-gaap	Effect Of Exchange Rate On Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents EffectOfExchangeRateOnCashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	-5446000	USD
CY2020	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	147110000	USD
CY2019	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	145484000	USD
CY2018	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	-92892000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	371991000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	226507000	USD
CY2017Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	319399000	USD
CY2020Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	519101000	USD
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	371991000	USD
CY2018Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	226507000	USD
CY2020	us-gaap	Interest Paid Net InterestPaidNet	72535000	USD
CY2019	us-gaap	Interest Paid Net InterestPaidNet	60852000	USD
CY2018	us-gaap	Interest Paid Net InterestPaidNet	89171000	USD
CY2020	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	53123000	USD
CY2019	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	27035000	USD
CY2018	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	20036000	USD
CY2020	us-gaap	Noncash Or Part Noncash Acquisition Value Of Assets Acquired1 NoncashOrPartNoncashAcquisitionValueOfAssetsAcquired1	3536000	USD
CY2019	us-gaap	Noncash Or Part Noncash Acquisition Value Of Assets Acquired1 NoncashOrPartNoncashAcquisitionValueOfAssetsAcquired1	30964000	USD
CY2018	us-gaap	Noncash Or Part Noncash Acquisition Value Of Assets Acquired1 NoncashOrPartNoncashAcquisitionValueOfAssetsAcquired1	15657000	USD
CY2020	clh	Payable For Estimated Purchase Price Adjustment Noncash Investing Activities PayableForEstimatedPurchasePriceAdjustmentNoncashInvestingActivities	0	USD
CY2019	clh	Payable For Estimated Purchase Price Adjustment Noncash Investing Activities PayableForEstimatedPurchasePriceAdjustmentNoncashInvestingActivities	0	USD
CY2018	clh	Payable For Estimated Purchase Price Adjustment Noncash Investing Activities PayableForEstimatedPurchasePriceAdjustmentNoncashInvestingActivities	4032000	USD
CY2020Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2019Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2017Q4	us-gaap	Stockholders Equity StockholdersEquity	1188202000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	65636000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-50964000	USD
CY2018	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	16792000	USD
CY2018	us-gaap	Stock Issued During Period Value Restricted Stock Award Net Of Forfeitures StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures	-3266000	USD
CY2018	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	45080000	USD
CY2018Q4	us-gaap	Stockholders Equity StockholdersEquity	1169756000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	97740000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	13320000	USD
CY2019	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	17816000	USD
CY2019	us-gaap	Stock Issued During Period Value Restricted Stock Award Net Of Forfeitures StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures	-7429000	USD
CY2019	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	21390000	USD
CY2019Q4	us-gaap	Stockholders Equity StockholdersEquity	1269813000	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	134837000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-1426000	USD
CY2020	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	18502000	USD
CY2020	us-gaap	Stock Issued During Period Value Restricted Stock Award Net Of Forfeitures StockIssuedDuringPeriodValueRestrictedStockAwardNetOfForfeitures	-5331000	USD
CY2020	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	74844000	USD
CY2020Q4	us-gaap	Stockholders Equity StockholdersEquity	1341551000	USD
CY2020	us-gaap	Use Of Estimates UseOfEstimates	<div style="margin-bottom:8pt;text-indent:22.5pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-style:italic;font-weight:400;line-height:120%">Use of Estimates</span></div><div style="margin-bottom:8pt;text-indent:24.75pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">The preparation of consolidated financial statements in conformity with accounting principles generally accepted in the United States of America requires management to make estimates and assumptions, which are evaluated on an ongoing basis, that affect the amounts reported in the Company's consolidated financial statements and accompanying notes. Management bases its estimates on historical experience and on various other assumptions it believes to be reasonable at the time under the circumstances, the results of which form the basis for making judgments about the carrying values of assets and liabilities and disclosure, if any, of contingent assets and liabilities and reported amounts of revenues and expenses. Actual results could differ from those estimates and judgments.</span></div>
CY2020	us-gaap	Prior Period Reclassification Adjustment Description PriorPeriodReclassificationAdjustmentDescription	<div style="margin-bottom:8pt;text-indent:24.75pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-style:italic;font-weight:400;line-height:120%">Reclassifications</span></div><div style="margin-bottom:8pt;text-indent:24.75pt"><span style="color:#000000;font-family:'Times New Roman',sans-serif;font-size:10pt;font-weight:400;line-height:120%">Certain prior year amounts have been reclassified to conform to the current year presentation. These reclassifications have no impact on previously reported subtotals.</span></div>
CY2020Q4	clh	Cash And Cash Equivalents Bank Disbursement Account Minimum Balance Allowed CashAndCashEquivalentsBankDisbursementAccountMinimumBalanceAllowed	0	USD
CY2020Q4	us-gaap	Cash Equivalents At Carrying Value CashEquivalentsAtCarryingValue	0	USD
CY2019Q4	us-gaap	Cash Equivalents At Carrying Value CashEquivalentsAtCarryingValue	2395000	USD
CY2020Q4	us-gaap	Marketable Securities MarketableSecurities	51857000	USD
CY2019Q4	us-gaap	Marketable Securities MarketableSecurities	42421000	USD
CY2020Q4	clh	Cash Equivalentsand Marketable Securities Current CashEquivalentsandMarketableSecuritiesCurrent	51857000	USD
CY2019Q4	clh	Cash Equivalentsand Marketable Securities Current CashEquivalentsandMarketableSecuritiesCurrent	44816000	USD
CY2020Q4	clh	Number Of Landfill Sites NumberOfLandfillSites	9	landfill_site
CY2020Q4	clh	Permitted But Not Highly Probable Airspace PermittedButNotHighlyProbableAirspace	0	cubic_yard
CY2019Q4	clh	Permitted But Not Highly Probable Airspace PermittedButNotHighlyProbableAirspace	0	cubic_yard
CY2019Q4	clh	Probable Airspace ProbableAirspace	28494000	cubic_yard
CY2018Q4	clh	Probable Airspace ProbableAirspace	29760000	cubic_yard
CY2017Q4	clh	Probable Airspace ProbableAirspace	31113000	cubic_yard
CY2020	clh	Changes In Highly Probable Airspace ChangesInHighlyProbableAirspace	-2962000	cubic_yard
CY2019	clh	Changes In Highly Probable Airspace ChangesInHighlyProbableAirspace	0	cubic_yard
CY2018	clh	Changes In Highly Probable Airspace ChangesInHighlyProbableAirspace	-223000	cubic_yard
CY2020	clh	Consumed Airspace ConsumedAirspace	816000	cubic_yard
CY2019	clh	Consumed Airspace ConsumedAirspace	1266000	cubic_yard
CY2018	clh	Consumed Airspace ConsumedAirspace	1130000	cubic_yard
CY2020Q4	clh	Probable Airspace ProbableAirspace	24716000	cubic_yard
CY2019Q4	clh	Probable Airspace ProbableAirspace	28494000	cubic_yard
CY2018Q4	clh	Probable Airspace ProbableAirspace	29760000	cubic_yard
CY2020	clh	Number Of Commercial Landfill Sites Closed During Period NumberOfCommercialLandfillSitesClosedDuringPeriod	2	landfill_site
CY2020Q4	clh	Landfill Final Closure And Post Closure Liabilities LandfillFinalClosureAndPostClosureLiabilities	48400000	USD
CY2019Q4	clh	Landfill Final Closure And Post Closure Liabilities LandfillFinalClosureAndPostClosureLiabilities	39400000	USD
CY2020	clh	Regulatory Post Closure Period For Landfill RegulatoryPostClosurePeriodForLandfill	P30Y
CY2019	clh	Inflation Rate InflationRate	0.0102
CY2020	clh	Inflation Rate InflationRate	0.0102
CY2020	clh	Asset Retirement Obligations Discount Rate AssetRetirementObligationsDiscountRate	0.0560
CY2020	us-gaap	Advertising Expense AdvertisingExpense	9000000.0	USD
CY2019	us-gaap	Advertising Expense AdvertisingExpense	9800000	USD
CY2019	clh	Asset Retirement Obligations Discount Rate AssetRetirementObligationsDiscountRate	0.0602
CY2020Q4	clh	Non Landfill Closure And Post Closure Liabilities NonLandfillClosureAndPostClosureLiabilities	39500000	USD
CY2019Q4	clh	Non Landfill Closure And Post Closure Liabilities NonLandfillClosureAndPostClosureLiabilities	36300000	USD
CY2020Q4	us-gaap	Accrual For Environmental Loss Contingencies AccrualForEnvironmentalLossContingencies	114800000	USD
CY2019Q4	us-gaap	Accrual For Environmental Loss Contingencies AccrualForEnvironmentalLossContingencies	114200000	USD
CY2020	clh	Period Of Time In Years Over Which Business Acquisitions Have Been Acquired PeriodOfTimeInYearsOverWhichBusinessAcquisitionsHaveBeenAcquired	P18Y
CY2018	us-gaap	Advertising Expense AdvertisingExpense	10500000	USD
CY2020	clh	Employee Retention Credit Amount Cares Act And Cews EmployeeRetentionCreditAmountCARESActAndCEWS	42300000	USD
CY2020	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	3144097000	USD
CY2020	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	3144097000	USD
CY2019	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	3412190000	USD
CY2019Q4	us-gaap	Property Plant And Equipment And Finance Lease Right Of Use Asset Accumulated Depreciation And Amortization PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization	2005663000	USD
CY2019	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	3412190000	USD
CY2018	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	3300303000	USD
CY2018	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	3300303000	USD
CY2020Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	611534000	USD
CY2019Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	644738000	USD
CY2020Q4	clh	Unbilled Accounts Receivable Current UnbilledAccountsReceivableCurrent	55681000	USD
CY2019Q4	clh	Unbilled Accounts Receivable Current UnbilledAccountsReceivableCurrent	56326000	USD
CY2020Q4	us-gaap	Contract With Customer Liability Current ContractWithCustomerLiabilityCurrent	74066000	USD
CY2019Q4	us-gaap	Contract With Customer Liability Current ContractWithCustomerLiabilityCurrent	73370000	USD
CY2020	clh	Deferred Contract Cost Recognition Period DeferredContractCostRecognitionPeriod	P3M
CY2020Q4	us-gaap	Capitalized Contract Cost Net CapitalizedContractCostNet	22800000	USD
CY2019Q4	us-gaap	Capitalized Contract Cost Net CapitalizedContractCostNet	21700000	USD
CY2020	clh	Deferred Contract Cost Recognition Period DeferredContractCostRecognitionPeriod	P3M
CY2020Q4	us-gaap	Inventory Net InventoryNet	220498000	USD
CY2019Q4	us-gaap	Inventory Net InventoryNet	214744000	USD
CY2020Q4	us-gaap	Property Plant And Equipment And Finance Lease Right Of Use Asset Before Accumulated Depreciation And Amortization PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortization	3699416000	USD
CY2019Q4	us-gaap	Property Plant And Equipment And Finance Lease Right Of Use Asset Before Accumulated Depreciation And Amortization PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetBeforeAccumulatedDepreciationAndAmortization	3593814000	USD
CY2020Q4	us-gaap	Property Plant And Equipment And Finance Lease Right Of Use Asset Accumulated Depreciation And Amortization PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAccumulatedDepreciationAndAmortization	2174118000	USD
CY2020Q4	us-gaap	Property Plant And Equipment And Finance Lease Right Of Use Asset After Accumulated Depreciation And Amortization PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization	1525298000	USD
CY2019Q4	us-gaap	Property Plant And Equipment And Finance Lease Right Of Use Asset After Accumulated Depreciation And Amortization PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization	1588151000	USD
CY2020	clh	Depreciation Inclusiveof Amortization DepreciationInclusiveofAmortization	257100000	USD
CY2019	clh	Depreciation Inclusiveof Amortization DepreciationInclusiveofAmortization	265500000	USD
CY2018	clh	Depreciation Inclusiveof Amortization DepreciationInclusiveofAmortization	264300000	USD
CY2018Q4	us-gaap	Goodwill Goodwill	514189000	USD
CY2019	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	12603000	USD
CY2019	us-gaap	Goodwill Purchase Accounting Adjustments GoodwillPurchaseAccountingAdjustments	-4030000	USD
CY2019	us-gaap	Goodwill Foreign Currency Translation Gain Loss GoodwillForeignCurrencyTranslationGainLoss	2251000	USD
CY2019Q4	us-gaap	Goodwill Goodwill	525013000	USD
CY2020	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	1439000	USD
CY2020	us-gaap	Goodwill Purchase Accounting Adjustments GoodwillPurchaseAccountingAdjustments	23000	USD
CY2020	us-gaap	Goodwill Written Off Related To Sale Of Business Unit GoodwillWrittenOffRelatedToSaleOfBusinessUnit	674000	USD
CY2020	us-gaap	Goodwill Foreign Currency Translation Gain Loss GoodwillForeignCurrencyTranslationGainLoss	1222000	USD
CY2020Q4	us-gaap	Goodwill Goodwill	527023000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	605136000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	341672000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	263464000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	624262000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	328130000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	296132000	USD
CY2020Q4	us-gaap	Intangible Assets Gross Excluding Goodwill IntangibleAssetsGrossExcludingGoodwill	728292000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	341672000	USD
CY2020Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	386620000	USD
CY2019Q4	us-gaap	Intangible Assets Gross Excluding Goodwill IntangibleAssetsGrossExcludingGoodwill	747196000	USD
CY2019Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	328130000	USD
CY2019Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	419066000	USD
CY2020	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	35800000	USD
CY2019	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	35200000	USD
CY2018	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	34400000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	30163000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	29911000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	25587000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	24092000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Five FiniteLivedIntangibleAssetsAmortizationExpenseYearFive	23121000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense After Year Five FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive	130590000	USD
CY2020Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	263464000	USD
CY2020Q4	us-gaap	Accrued Insurance Current AccruedInsuranceCurrent	77514000	USD
CY2019Q4	us-gaap	Accrued Insurance Current AccruedInsuranceCurrent	74376000	USD
CY2020Q4	us-gaap	Interest Payable Current InterestPayableCurrent	19697000	USD
CY2019Q4	us-gaap	Interest Payable Current InterestPayableCurrent	21222000	USD
CY2020Q4	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	81437000	USD
CY2019Q4	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	72473000	USD
CY2020Q4	us-gaap	Taxes Payable Current TaxesPayableCurrent	25843000	USD
CY2019Q4	us-gaap	Taxes Payable Current TaxesPayableCurrent	35749000	USD
CY2020Q4	us-gaap	Derivative Liabilities Current DerivativeLiabilitiesCurrent	33630000	USD
CY2019Q4	us-gaap	Derivative Liabilities Current DerivativeLiabilitiesCurrent	20840000	USD
CY2020Q4	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	57702000	USD
CY2019Q4	us-gaap	Other Accrued Liabilities Current OtherAccruedLiabilitiesCurrent	51880000	USD
CY2020Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	295823000	USD
CY2019Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	276540000	USD
CY2020Q4	clh	Accrued Insurance Employee Medical Insurance Costs AccruedInsuranceEmployeeMedicalInsuranceCosts	9400000	USD
CY2019Q4	clh	Accrued Insurance Employee Medical Insurance Costs AccruedInsuranceEmployeeMedicalInsuranceCosts	14300000	USD
CY2020Q4	clh	Accrual For Workers Compensation Comprehensive General Liability And Vehicle Liability Self Insurance Programs AccrualForWorkersCompensationComprehensiveGeneralLiabilityAndVehicleLiabilitySelfInsurancePrograms	65600000	USD
CY2019Q4	clh	Accrual For Workers Compensation Comprehensive General Liability And Vehicle Liability Self Insurance Programs AccrualForWorkersCompensationComprehensiveGeneralLiabilityAndVehicleLiabilitySelfInsurancePrograms	59400000	USD
CY2020	us-gaap	Increase Decrease In Employee Related Liabilities IncreaseDecreaseInEmployeeRelatedLiabilities	17000000.0	USD
CY2020	us-gaap	Increase Decrease In Accrued Salaries IncreaseDecreaseInAccruedSalaries	-4800000	USD
CY2020Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	87926000	USD
CY2020	clh	Increase Decrease In Accrued Bonuses IncreaseDecreaseInAccruedBonuses	-3500000	USD
CY2018Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	69931000	USD
CY2019	clh	Asset Retirement Obligation Liabilities Assumedin Acquisition AssetRetirementObligationLiabilitiesAssumedinAcquisition	220000	USD
CY2019	us-gaap	Asset Retirement Obligation Liabilities Incurred AssetRetirementObligationLiabilitiesIncurred	2705000	USD
CY2019	clh	Asset Retirement Obligation Adjustment Relatedto Dispositionof Business AssetRetirementObligationAdjustmentRelatedtoDispositionofBusiness	5601000	USD
CY2019	clh	Asset Retirement Obligation Changes Recorded In Statement Of Income AssetRetirementObligationChangesRecordedInStatementOfIncome	-2685000	USD
CY2019	clh	Asset Retirement Obligation Changes Recorded In Balance Sheet AssetRetirementObligationChangesRecordedInBalanceSheet	3865000	USD
CY2019	us-gaap	Asset Retirement Obligation Liabilities Settled AssetRetirementObligationLiabilitiesSettled	9839000	USD
CY2019	us-gaap	Asset Retirement Obligation Foreign Currency Translation Gain Loss AssetRetirementObligationForeignCurrencyTranslationGainLoss	-483000	USD
CY2019Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	75651000	USD
CY2020	clh	Asset Retirement Obligation Liabilities Assumedin Acquisition AssetRetirementObligationLiabilitiesAssumedinAcquisition	265000	USD
CY2020	us-gaap	Asset Retirement Obligation Liabilities Incurred AssetRetirementObligationLiabilitiesIncurred	2101000	USD
CY2020	clh	Asset Retirement Obligation Adjustment Relatedto Dispositionof Business AssetRetirementObligationAdjustmentRelatedtoDispositionofBusiness	6653000	USD
CY2020	clh	Asset Retirement Obligation Changes Recorded In Statement Of Income AssetRetirementObligationChangesRecordedInStatementOfIncome	-6568000	USD
CY2020	clh	Asset Retirement Obligation Changes Recorded In Balance Sheet AssetRetirementObligationChangesRecordedInBalanceSheet	682000	USD
CY2020Q4	clh	Undiscounted Closure And Post Closure Liabilities UndiscountedClosureAndPostClosureLiabilities	320911000	USD
CY2020Q4	clh	Discount Reserves DiscountReserves	159164000	USD
CY2020Q4	clh	Reserves To Be Provided Over Remaining Site Lives ReservesToBeProvidedOverRemainingSiteLives	73821000	USD
CY2020	us-gaap	Asset Retirement Obligation Liabilities Settled AssetRetirementObligationLiabilitiesSettled	4198000	USD
CY2020	us-gaap	Asset Retirement Obligation Foreign Currency Translation Gain Loss AssetRetirementObligationForeignCurrencyTranslationGainLoss	-204000	USD
CY2020Q4	us-gaap	Asset Retirement Obligation AssetRetirementObligation	87926000	USD
CY2020	clh	Number Of Commercial Landfill Sites Closed During Period NumberOfCommercialLandfillSitesClosedDuringPeriod	2	landfill_site
CY2020	us-gaap	Environmental Remediation Expense EnvironmentalRemediationExpense	6800000	USD
CY2020	clh	Number Of Commercial Landfill Sites Closed During Period NumberOfCommercialLandfillSitesClosedDuringPeriod	2	landfill_site
CY2019	clh	Asset Retirement Obligation Changes Recorded In Statement Of Income Related To Increased Facility Closure Costs AssetRetirementObligationChangesRecordedInStatementOfIncomeRelatedToIncreasedFacilityClosureCosts	2300000	USD
CY2020Q4	clh	Anticipated Payment For Asset Retirement Obligations Year One AnticipatedPaymentForAssetRetirementObligationsYearOne	14941000	USD
CY2020Q4	clh	Anticipated Payment For Asset Retirement Obligations Year Two AnticipatedPaymentForAssetRetirementObligationsYearTwo	7816000	USD
CY2020Q4	clh	Anticipated Payment For Asset Retirement Obligations Year Three AnticipatedPaymentForAssetRetirementObligationsYearThree	16181000	USD
CY2020Q4	clh	Anticipated Payment For Asset Retirement Obligations Year Four AnticipatedPaymentForAssetRetirementObligationsYearFour	6868000	USD
CY2020Q4	clh	Anticipated Payment For Asset Retirement Obligations Year Five AnticipatedPaymentForAssetRetirementObligationsYearFive	5628000	USD
CY2020Q4	clh	Anticipated Payment For Asset Retirement Obligations After Year Five AnticipatedPaymentForAssetRetirementObligationsAfterYearFive	269477000	USD
CY2018Q4	us-gaap	Accrual For Environmental Loss Contingencies AccrualForEnvironmentalLossContingencies	121017000	USD
CY2019	us-gaap	Accrual For Environmental Loss Contingencies Charges To Expense For New Losses AccrualForEnvironmentalLossContingenciesChargesToExpenseForNewLosses	4535000	USD
CY2019	us-gaap	Accrual For Environmental Loss Contingencies Increase Decrease For Revision In Estimates AccrualForEnvironmentalLossContingenciesIncreaseDecreaseForRevisionInEstimates	-3017000	USD
CY2019	us-gaap	Accrual For Environmental Loss Contingencies Payments1 AccrualForEnvironmentalLossContingenciesPayments1	8862000	USD
CY2019	clh	Accrual For Environmental Loss Contingencies Increase Decrease For Currency Translation And Other AccrualForEnvironmentalLossContingenciesIncreaseDecreaseForCurrencyTranslationAndOther	-500000	USD
CY2019Q4	us-gaap	Accrual For Environmental Loss Contingencies AccrualForEnvironmentalLossContingencies	114173000	USD
CY2020	us-gaap	Accrual For Environmental Loss Contingencies Charges To Expense For New Losses AccrualForEnvironmentalLossContingenciesChargesToExpenseForNewLosses	4398000	USD
CY2020	us-gaap	Accrual For Environmental Loss Contingencies Increase Decrease For Revision In Estimates AccrualForEnvironmentalLossContingenciesIncreaseDecreaseForRevisionInEstimates	4130000	USD
CY2020	us-gaap	Accrual For Environmental Loss Contingencies Payments1 AccrualForEnvironmentalLossContingenciesPayments1	8203000	USD
CY2020	clh	Accrual For Environmental Loss Contingencies Increase Decrease For Currency Translation And Other AccrualForEnvironmentalLossContingenciesIncreaseDecreaseForCurrencyTranslationAndOther	-315000	USD
CY2020Q4	us-gaap	Accrual For Environmental Loss Contingencies AccrualForEnvironmentalLossContingencies	114813000	USD
CY2019	us-gaap	Accrual For Environmental Loss Contingencies Increase Decrease For Revision In Estimates AccrualForEnvironmentalLossContingenciesIncreaseDecreaseForRevisionInEstimates	-3000000.0	USD
CY2019Q4	clh	Accrual For Environmental Loss Contingencies Revision In Estimates Number Of Locations AccrualForEnvironmentalLossContingenciesRevisionInEstimatesNumberOfLocations	5	location
CY2020Q4	us-gaap	Accrual For Environmental Loss Contingencies Undiscounted Due Within One Year AccrualForEnvironmentalLossContingenciesUndiscountedDueWithinOneYear	12718000	USD
CY2020Q4	us-gaap	Accrual For Environmental Loss Contingencies Undiscounted Due In Second Year AccrualForEnvironmentalLossContingenciesUndiscountedDueInSecondYear	19275000	USD
CY2020Q4	us-gaap	Accrual For Environmental Loss Contingencies Undiscounted Due In Third Year AccrualForEnvironmentalLossContingenciesUndiscountedDueInThirdYear	11420000	USD
CY2020Q4	us-gaap	Accrual For Environmental Loss Contingencies Undiscounted Due In Fourth Year AccrualForEnvironmentalLossContingenciesUndiscountedDueInFourthYear	9073000	USD
CY2020Q4	us-gaap	Accrual For Environmental Loss Contingencies Undiscounted Due In Fifth Year AccrualForEnvironmentalLossContingenciesUndiscountedDueInFifthYear	6526000	USD
CY2020Q4	us-gaap	Accrual For Environmental Loss Contingencies Undiscounted Due After Fifth Year AccrualForEnvironmentalLossContingenciesUndiscountedDueAfterFifthYear	75915000	USD
CY2020Q4	us-gaap	Accrual For Environmental Loss Contingencies Gross AccrualForEnvironmentalLossContingenciesGross	134927000	USD
CY2020Q4	us-gaap	Accrual For Environmental Loss Contingencies Discount AccrualForEnvironmentalLossContingenciesDiscount	20114000	USD
CY2020Q4	us-gaap	Accrual For Environmental Loss Contingencies AccrualForEnvironmentalLossContingencies	114813000	USD
CY2020Q4	clh	Accrualfor Environmental Loss Contingencies Threshold For Disclosure AccrualforEnvironmentalLossContingenciesThresholdForDisclosure	0.05
CY2020Q4	us-gaap	Accrual For Environmental Loss Contingencies AccrualForEnvironmentalLossContingencies	114813000	USD
CY2020	clh	Accrual For Environmental Loss Contingencies Percent Of Total AccrualForEnvironmentalLossContingenciesPercentOfTotal	1.000
CY2020	us-gaap	Environmental Exit Costs Reasonably Possible Additional Loss EnvironmentalExitCostsReasonablyPossibleAdditionalLoss	22241000	USD
CY2020Q4	clh	Accrualfor Environmental Loss Contingencies Threshold For Disclosure AccrualforEnvironmentalLossContingenciesThresholdForDisclosure	0.05
CY2020Q4	us-gaap	Accrual For Environmental Loss Contingencies AccrualForEnvironmentalLossContingencies	114813000	USD
CY2020	clh	Accrual For Environmental Loss Contingencies Percent Of Total AccrualForEnvironmentalLossContingenciesPercentOfTotal	1.000
CY2020	us-gaap	Environmental Exit Costs Reasonably Possible Additional Loss EnvironmentalExitCostsReasonablyPossibleAdditionalLoss	22241000	USD
CY2020Q4	us-gaap	Accrual For Environmental Loss Contingencies AccrualForEnvironmentalLossContingencies	114800000	USD
CY2020Q4	us-gaap	Debt Instrument Carrying Amount DebtInstrumentCarryingAmount	1564626000	USD
CY2019Q4	us-gaap	Debt Instrument Carrying Amount DebtInstrumentCarryingAmount	1572162000	USD
CY2020Q4	us-gaap	Debt Instrument Unamortized Discount Premium And Debt Issuance Costs Net DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet	14985000	USD
CY2019Q4	us-gaap	Debt Instrument Unamortized Discount Premium And Debt Issuance Costs Net DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet	18046000	USD
CY2020Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	1549641000	USD
CY2019Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	1554116000	USD
CY2019	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-6100000	USD
CY2018	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-2500000	USD
CY2019Q4	us-gaap	Long Term Debt Fair Value LongTermDebtFairValue	1600000000	USD
CY2020Q4	us-gaap	Long Term Debt Fair Value LongTermDebtFairValue	1600000000	USD
CY2020Q4	us-gaap	Line Of Credit Facility Remaining Borrowing Capacity LineOfCreditFacilityRemainingBorrowingCapacity	264000000.0	USD
CY2020Q4	us-gaap	Letters Of Credit Outstanding Amount LettersOfCreditOutstandingAmount	120600000	USD
CY2020Q4	us-gaap	Debt Instrument Interest Rate Effective Percentage DebtInstrumentInterestRateEffectivePercentage	0.0467
CY2020Q4	us-gaap	Derivative Liabilities DerivativeLiabilities	33600000	USD
CY2019Q4	us-gaap	Derivative Liabilities DerivativeLiabilities	20800000	USD
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	168117000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	156571000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	115070000	USD
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	6433000	USD
CY2018	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	4781000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	-8332000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	-20588000	USD
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	174550000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	148239000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	94482000	USD
CY2020	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	33327000	USD
CY2019	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	20482000	USD
CY2018	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	-7677000	USD
CY2020	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	14575000	USD
CY2019	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	14564000	USD
CY2018	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	12653000	USD
CY2020	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	1559000	USD
CY2019	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	7448000	USD
CY2020	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	49461000	USD
CY2019	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	42494000	USD
CY2018	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	9757000	USD
CY2020	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-965000	USD
CY2019	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	7933000	USD
CY2018	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	19899000	USD
CY2020	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-2506000	USD
CY2019	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	550000	USD
CY2018	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-1205000	USD
CY2020	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	-6277000	USD
CY2019	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	-478000	USD
CY2018	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	395000	USD
CY2020	clh	Deferred Income Tax Expense Benefit Net Of Discontinued Operations DeferredIncomeTaxExpenseBenefitNetOfDiscontinuedOperations	-9748000	USD
CY2019	clh	Deferred Income Tax Expense Benefit Net Of Discontinued Operations DeferredIncomeTaxExpenseBenefitNetOfDiscontinuedOperations	8005000	USD
CY2018	clh	Deferred Income Tax Expense Benefit Net Of Discontinued Operations DeferredIncomeTaxExpenseBenefitNetOfDiscontinuedOperations	19089000	USD
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	39713000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	50499000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	28846000	USD
CY2020	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.228
CY2019	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.341
CY2018	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.305
CY2020	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	36655000	USD
CY2019	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	31130000	USD
CY2018	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	19841000	USD
CY2020	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	9837000	USD
CY2019	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	10597000	USD
CY2018	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	8711000	USD
CY2020	us-gaap	Income Tax Reconciliation Foreign Income Tax Rate Differential IncomeTaxReconciliationForeignIncomeTaxRateDifferential	1256000	USD
CY2019	us-gaap	Income Tax Reconciliation Foreign Income Tax Rate Differential IncomeTaxReconciliationForeignIncomeTaxRateDifferential	276000	USD
CY2018	us-gaap	Income Tax Reconciliation Foreign Income Tax Rate Differential IncomeTaxReconciliationForeignIncomeTaxRateDifferential	-1124000	USD
CY2020	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	-11339000	USD
CY2019	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	4459000	USD
CY2018	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	10466000	USD
CY2020	clh	Uncertain Tax Position Interest And Penalties Net Of Benefit UncertainTaxPositionInterestAndPenaltiesNetOfBenefit	712000	USD
CY2019	clh	Uncertain Tax Position Interest And Penalties Net Of Benefit UncertainTaxPositionInterestAndPenaltiesNetOfBenefit	-474000	USD
CY2018	clh	Uncertain Tax Position Interest And Penalties Net Of Benefit UncertainTaxPositionInterestAndPenaltiesNetOfBenefit	1806000	USD
CY2020	us-gaap	Income Tax Reconciliation Tax Credits IncomeTaxReconciliationTaxCredits	-2039000	USD
CY2019	us-gaap	Income Tax Reconciliation Tax Credits IncomeTaxReconciliationTaxCredits	50000	USD
CY2018	us-gaap	Income Tax Reconciliation Tax Credits IncomeTaxReconciliationTaxCredits	9799000	USD
CY2020	us-gaap	Income Tax Reconciliation Nondeductible Expense IncomeTaxReconciliationNondeductibleExpense	1406000	USD
CY2019	us-gaap	Income Tax Reconciliation Nondeductible Expense IncomeTaxReconciliationNondeductibleExpense	1922000	USD
CY2018	us-gaap	Income Tax Reconciliation Nondeductible Expense IncomeTaxReconciliationNondeductibleExpense	1813000	USD
CY2020	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	571000	USD
CY2019	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	1691000	USD
CY2018	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	1032000	USD
CY2020	us-gaap	Effective Income Tax Rate Reconciliation Tax Cuts And Jobs Act Of2017 Amount EffectiveIncomeTaxRateReconciliationTaxCutsAndJobsActOf2017Amount	0	USD
CY2019	us-gaap	Effective Income Tax Rate Reconciliation Tax Cuts And Jobs Act Of2017 Amount EffectiveIncomeTaxRateReconciliationTaxCutsAndJobsActOf2017Amount	0	USD
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Tax Cuts And Jobs Act Of2017 Amount EffectiveIncomeTaxRateReconciliationTaxCutsAndJobsActOf2017Amount	-288000	USD
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	39713000	USD
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	50499000	USD
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	28846000	USD
CY2020	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	-11300000	USD
CY2018	clh	Income Tax Expense Benefit From Analysis Of Federal Manufacturing And Research And Development Credit Benefits IncomeTaxExpenseBenefitFromAnalysisOfFederalManufacturingAndResearchAndDevelopmentCreditBenefits	-3300000	USD
CY2018Q4	clh	Additional Tax Credit From Analysis Of Federal Manufacturing And Research And Development Credit Benefits AdditionalTaxCreditFromAnalysisOfFederalManufacturingAndResearchAndDevelopmentCreditBenefits	7100000	USD
CY2018	us-gaap	Income Tax Reconciliation Tax Credits IncomeTaxReconciliationTaxCredits	9800000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Foreign Currency Translation Adjustment Tax OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax	-1300000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Foreign Currency Translation Adjustment Tax OtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax	-5000000.0	USD
CY2020Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Allowance For Doubtful Accounts DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts	10305000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Allowance For Doubtful Accounts DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts	8949000	USD
CY2020Q4	clh	Deferred Tax Assets Closure Post Closure And Remedial Liabilities DeferredTaxAssetsClosurePostClosureAndRemedialLiabilities	28665000	USD
CY2019Q4	clh	Deferred Tax Assets Closure Post Closure And Remedial Liabilities DeferredTaxAssetsClosurePostClosureAndRemedialLiabilities	26960000	USD
CY2020Q4	clh	Deferred Tax Assets Operating Lease Liabilities DeferredTaxAssetsOperatingLeaseLiabilities	38151000	USD
CY2019Q4	clh	Deferred Tax Assets Operating Lease Liabilities DeferredTaxAssetsOperatingLeaseLiabilities	40879000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Accrued Liabilities DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities	16797000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Accrued Liabilities DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities	17602000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Employee Compensation DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation	11372000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Employee Compensation DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation	7155000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	50433000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	50824000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards DeferredTaxAssetsTaxCreditCarryforwards	14471000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards DeferredTaxAssetsTaxCreditCarryforwards	16909000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Derivative Instruments DeferredTaxAssetsDerivativeInstruments	10089000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Derivative Instruments DeferredTaxAssetsDerivativeInstruments	6252000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	3040000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Share Based Compensation Cost DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost	2435000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	5553000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	8342000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	188876000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	186307000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	194604000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	184594000	USD
CY2020Q4	clh	Deferred Tax Liabilities Operating Lease Right Of Use Assets DeferredTaxLiabilitiesOperatingLeaseRightOfUseAssets	38018000	USD
CY2019Q4	clh	Deferred Tax Liabilities Operating Lease Right Of Use Assets DeferredTaxLiabilitiesOperatingLeaseRightOfUseAssets	40985000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets Intangible Assets DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets	95492000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets Intangible Assets DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets	98654000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities Prepaid Expenses DeferredTaxLiabilitiesPrepaidExpenses	9660000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities Prepaid Expenses DeferredTaxLiabilitiesPrepaidExpenses	9694000	USD
CY2020Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	337774000	USD
CY2019Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	333927000	USD
CY2020Q4	clh	Deferred Tax Liabilities Net Before Valuation Allowance DeferredTaxLiabilitiesNetBeforeValuationAllowance	148898000	USD
CY2019Q4	clh	Deferred Tax Liabilities Net Before Valuation Allowance DeferredTaxLiabilitiesNetBeforeValuationAllowance	147620000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	77044000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	83643000	USD
CY2020Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	225942000	USD
CY2019Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	231263000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards State And Local DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal	193200000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards Domestic DeferredTaxAssetsOperatingLossCarryforwardsDomestic	16800000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards Foreign DeferredTaxAssetsOperatingLossCarryforwardsForeign	151500000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards Foreign DeferredTaxAssetsTaxCreditCarryforwardsForeign	14100000	USD
CY2020Q4	clh	Deferred Tax Assets Valuation Allowance Foreign Tax Credits DeferredTaxAssetsValuationAllowanceForeignTaxCredits	14127000	USD
CY2019Q4	clh	Deferred Tax Assets Valuation Allowance Foreign Tax Credits DeferredTaxAssetsValuationAllowanceForeignTaxCredits	16565000	USD
CY2020Q4	clh	Deferred Tax Assets Valuation Allowance Acquired Federal Net Operating Losses DeferredTaxAssetsValuationAllowanceAcquiredFederalNetOperatingLosses	779000	USD
CY2019Q4	clh	Deferred Tax Assets Valuation Allowance Acquired Federal Net Operating Losses DeferredTaxAssetsValuationAllowanceAcquiredFederalNetOperatingLosses	779000	USD
CY2020Q4	clh	Deferred Tax Assets Valuation Allowance State Net Operating Loss Carryforwards DeferredTaxAssetsValuationAllowanceStateNetOperatingLossCarryforwards	10429000	USD
CY2019Q4	clh	Deferred Tax Assets Valuation Allowance State Net Operating Loss Carryforwards DeferredTaxAssetsValuationAllowanceStateNetOperatingLossCarryforwards	10663000	USD
CY2020Q4	clh	Deferred Tax Assets Valuation Allowance Foreign Net Operating Loss Carryforwards DeferredTaxAssetsValuationAllowanceForeignNetOperatingLossCarryforwards	29839000	USD
CY2019Q4	clh	Deferred Tax Assets Valuation Allowance Foreign Net Operating Loss Carryforwards DeferredTaxAssetsValuationAllowanceForeignNetOperatingLossCarryforwards	34149000	USD
CY2020Q4	clh	Deferred Tax Assets Valuation Allowance Deferred Tax Assets Of Subsidiary DeferredTaxAssetsValuationAllowanceDeferredTaxAssetsOfSubsidiary	11468000	USD
CY2019Q4	clh	Deferred Tax Assets Valuation Allowance Deferred Tax Assets Of Subsidiary DeferredTaxAssetsValuationAllowanceDeferredTaxAssetsOfSubsidiary	14922000	USD
CY2019	us-gaap	Net Income Loss NetIncomeLoss	97740000	USD
CY2020Q4	clh	Deferred Tax Assets Valuation Allowance Realized And Unrealized Capital Losses DeferredTaxAssetsValuationAllowanceRealizedAndUnrealizedCapitalLosses	10402000	USD
CY2019Q4	clh	Deferred Tax Assets Valuation Allowance Realized And Unrealized Capital Losses DeferredTaxAssetsValuationAllowanceRealizedAndUnrealizedCapitalLosses	6565000	USD
CY2020Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	77044000	USD
CY2019Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	83643000	USD
CY2019Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	6414000	USD
CY2018Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	3159000	USD
CY2017Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	5121000	USD
CY2020	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	833000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	3354000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	625000	USD
CY2020	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	203000	USD
CY2019	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	209000	USD
CY2018	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Settlements With Taxing Authorities UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities	1115000	USD
CY2020	us-gaap	Foreign Currency Transaction Gain Loss Unrealized ForeignCurrencyTransactionGainLossUnrealized	112000	USD
CY2019	us-gaap	Foreign Currency Transaction Gain Loss Unrealized ForeignCurrencyTransactionGainLossUnrealized	110000	USD
CY2018	us-gaap	Foreign Currency Transaction Gain Loss Unrealized ForeignCurrencyTransactionGainLossUnrealized	-222000	USD
CY2020Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	5490000	USD
CY2019Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	6414000	USD
CY2018Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	3159000	USD
CY2019	clh	Unrecognized Tax Benefits Increase Resulting From Transfer Pricing Adjustments UnrecognizedTaxBenefitsIncreaseResultingFromTransferPricingAdjustments	3100000	USD
CY2020	clh	Unrecognized Tax Benefits Increase Resulting From Transfer Pricing Adjustments UnrecognizedTaxBenefitsIncreaseResultingFromTransferPricingAdjustments	3100000	USD
CY2020	clh	Unrecognized Tax Benefits Transfer Pricing Adjustments Offsetting Benefit UnrecognizedTaxBenefitsTransferPricingAdjustmentsOffsettingBenefit	3100000	USD
CY2020Q4	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	2100000	USD
CY2019Q4	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	1700000	USD
CY2018Q4	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	800000	USD
CY2020	us-gaap	Net Income Loss NetIncomeLoss	134837000	USD
CY2018	us-gaap	Net Income Loss NetIncomeLoss	65636000	USD
CY2020	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	55479000	shares
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	55845000	shares
CY2018	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	56148000	shares
CY2020	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	211000	shares
CY2019	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	284000	shares
CY2018	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	192000	shares
CY2020	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	55690000	shares
CY2019	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	56129000	shares
CY2018	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	56340000	shares
CY2020	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	2.43
CY2019	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	1.75
CY2018	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	1.17
CY2020	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	2.42
CY2019	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	1.74
CY2018	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	1.16
CY2020Q4	us-gaap	Stock Repurchase Program Authorized Amount1 StockRepurchaseProgramAuthorizedAmount1	600000000.0	USD
CY2020	us-gaap	Stock Repurchased And Retired During Period Shares StockRepurchasedAndRetiredDuringPeriodShares	1200000	shares
CY2019	us-gaap	Stock Repurchased And Retired During Period Shares StockRepurchasedAndRetiredDuringPeriodShares	300000	shares
CY2018	us-gaap	Stock Repurchased And Retired During Period Shares StockRepurchasedAndRetiredDuringPeriodShares	800000	shares
CY2020	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	74800000	USD
CY2019	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	21400000	USD
CY2018	us-gaap	Stock Repurchased And Retired During Period Value StockRepurchasedAndRetiredDuringPeriodValue	45100000	USD
CY2020Q4	us-gaap	Stock Repurchase Program Remaining Authorized Repurchase Amount1 StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1	209900000	USD
CY2018	us-gaap	Oci Before Reclassifications Before Tax Attributable To Parent OciBeforeReclassificationsBeforeTaxAttributableToParent	-56647000	USD
CY2018	us-gaap	Reclassification From Aoci Current Period Before Tax Attributable To Parent ReclassificationFromAociCurrentPeriodBeforeTaxAttributableToParent	-806000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Tax Portion Attributable To Parent1 OtherComprehensiveIncomeLossTaxPortionAttributableToParent1	-4877000	USD
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-50964000	USD
CY2019	us-gaap	Oci Before Reclassifications Before Tax Attributable To Parent OciBeforeReclassificationsBeforeTaxAttributableToParent	10719000	USD
CY2019	us-gaap	Reclassification From Aoci Current Period Before Tax Attributable To Parent ReclassificationFromAociCurrentPeriodBeforeTaxAttributableToParent	-2667000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Tax Portion Attributable To Parent1 OtherComprehensiveIncomeLossTaxPortionAttributableToParent1	66000	USD
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	13320000	USD
CY2020	us-gaap	Oci Before Reclassifications Before Tax Attributable To Parent OciBeforeReclassificationsBeforeTaxAttributableToParent	-11023000	USD
CY2020	us-gaap	Reclassification From Aoci Current Period Before Tax Attributable To Parent ReclassificationFromAociCurrentPeriodBeforeTaxAttributableToParent	-8180000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Tax Portion Attributable To Parent1 OtherComprehensiveIncomeLossTaxPortionAttributableToParent1	-1417000	USD
CY2020	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-1426000	USD
CY2020	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	18500000	USD
CY2019	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	17800000	USD
CY2018	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	16800000	USD
CY2020	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	4200000	USD
CY2019	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	3100000	USD
CY2018	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	3200000	USD
CY2020Q4	us-gaap	Loss Contingency Accrual At Carrying Value LossContingencyAccrualAtCarryingValue	29800000	USD
CY2019Q4	us-gaap	Loss Contingency Accrual At Carrying Value LossContingencyAccrualAtCarryingValue	26000000.0	USD
CY2020Q4	us-gaap	Loss Contingency Accrual At Carrying Value LossContingencyAccrualAtCarryingValue	29800000	USD
CY2019Q4	us-gaap	Loss Contingency Accrual At Carrying Value LossContingencyAccrualAtCarryingValue	26000000.0	USD
CY2020	clh	Retentionfor Environmental Impairment RetentionforEnvironmentalImpairment	1000000.0	USD
CY2020	clh	Self Insurance Liabilities SelfInsuranceLiabilities	65600000	USD
CY2019	clh	Self Insurance Liabilities SelfInsuranceLiabilities	59400000	USD
CY2020	us-gaap	Financial Guarantee Insurance Contracts Claim Liability Weighted Average Risk Free Discount Rate FinancialGuaranteeInsuranceContractsClaimLiabilityWeightedAverageRiskFreeDiscountRate	0.0029
CY2019	us-gaap	Financial Guarantee Insurance Contracts Claim Liability Weighted Average Risk Free Discount Rate FinancialGuaranteeInsuranceContractsClaimLiabilityWeightedAverageRiskFreeDiscountRate	0.0152
CY2020Q4	clh	Anticipated Self Insurance Payments Year One AnticipatedSelfInsurancePaymentsYearOne	22896000	USD
CY2020Q4	clh	Anticipated Self Insurance Payments Year Two AnticipatedSelfInsurancePaymentsYearTwo	13751000	USD
CY2020Q4	clh	Anticipated Self Insurance Payments Year Three AnticipatedSelfInsurancePaymentsYearThree	9655000	USD
CY2020Q4	clh	Anticipated Self Insurance Payments Year Four AnticipatedSelfInsurancePaymentsYearFour	6448000	USD
CY2020Q4	clh	Anticipated Self Insurance Payments Year Five AnticipatedSelfInsurancePaymentsYearFive	4990000	USD
CY2020Q4	clh	Anticipated Self Insurance Payments Thereafter AnticipatedSelfInsurancePaymentsThereafter	8188000	USD
CY2020Q4	clh	Undiscounted Self Insurance Liabilities UndiscountedSelfInsuranceLiabilities	65928000	USD
CY2020Q4	clh	Self Insurance Discount Rate SelfInsuranceDiscountRate	320000	USD
CY2020Q4	us-gaap	Self Insurance Reserve SelfInsuranceReserve	65608000	USD
CY2020Q4	us-gaap	Finance Lease Right Of Use Asset FinanceLeaseRightOfUseAsset	60271000	USD
CY2019Q4	us-gaap	Finance Lease Right Of Use Asset FinanceLeaseRightOfUseAsset	32307000	USD
CY2020Q4	us-gaap	Finance Lease Liability Current FinanceLeaseLiabilityCurrent	5840000	USD
CY2019Q4	us-gaap	Finance Lease Liability Current FinanceLeaseLiabilityCurrent	801000	USD
CY2020Q4	us-gaap	Finance Lease Liability Noncurrent FinanceLeaseLiabilityNoncurrent	55038000	USD
CY2019Q4	us-gaap	Finance Lease Liability Noncurrent FinanceLeaseLiabilityNoncurrent	34517000	USD
CY2020	us-gaap	Operating Lease Cost OperatingLeaseCost	53194000	USD
CY2019	us-gaap	Operating Lease Cost OperatingLeaseCost	55402000	USD
CY2020	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	4966000	USD
CY2019	us-gaap	Finance Lease Right Of Use Asset Amortization FinanceLeaseRightOfUseAssetAmortization	1142000	USD
CY2020	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	1523000	USD
CY2019	us-gaap	Finance Lease Interest Expense FinanceLeaseInterestExpense	1415000	USD
CY2019	clh	Finance Lease Cost FinanceLeaseCost	2557000	USD
CY2020	us-gaap	Short Term Lease Cost ShortTermLeaseCost	70692000	USD
CY2019	us-gaap	Short Term Lease Cost ShortTermLeaseCost	84749000	USD
CY2020	us-gaap	Variable Lease Cost VariableLeaseCost	3691000	USD
CY2019	us-gaap	Variable Lease Cost VariableLeaseCost	6702000	USD
CY2020	us-gaap	Lease Cost LeaseCost	134066000	USD
CY2019	us-gaap	Lease Cost LeaseCost	149410000	USD
CY2018	us-gaap	Operating Leases Rent Expense Net OperatingLeasesRentExpenseNet	141100000	USD
CY2020Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P5Y1M6D
CY2019Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P5Y1M6D
CY2020Q4	us-gaap	Finance Lease Weighted Average Remaining Lease Term1 FinanceLeaseWeightedAverageRemainingLeaseTerm1	P9Y3M18D
CY2019Q4	us-gaap	Finance Lease Weighted Average Remaining Lease Term1 FinanceLeaseWeightedAverageRemainingLeaseTerm1	P21Y3M18D
CY2020Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.0489
CY2019Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.0529
CY2020Q4	us-gaap	Finance Lease Weighted Average Discount Rate Percent FinanceLeaseWeightedAverageDiscountRatePercent	0.0357
CY2019Q4	us-gaap	Finance Lease Weighted Average Discount Rate Percent FinanceLeaseWeightedAverageDiscountRatePercent	0.0497
CY2020	us-gaap	Operating Lease Payments OperatingLeasePayments	53498000	USD
CY2019	us-gaap	Operating Lease Payments OperatingLeasePayments	56240000	USD
CY2020	us-gaap	Finance Lease Interest Payment On Liability FinanceLeaseInterestPaymentOnLiability	1523000	USD
CY2019	us-gaap	Finance Lease Interest Payment On Liability FinanceLeaseInterestPaymentOnLiability	1415000	USD
CY2020	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	4469000	USD
CY2019	us-gaap	Finance Lease Principal Payments FinanceLeasePrincipalPayments	586000	USD
CY2020	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	34358000	USD
CY2019	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	17699000	USD
CY2020	us-gaap	Right Of Use Asset Obtained In Exchange For Finance Lease Liability RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability	32526000	USD
CY2019	us-gaap	Right Of Use Asset Obtained In Exchange For Finance Lease Liability RightOfUseAssetObtainedInExchangeForFinanceLeaseLiability	33449000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	45341000	USD
CY2020Q4	us-gaap	Finance Lease Liability Payments Due Next Twelve Months FinanceLeaseLiabilityPaymentsDueNextTwelveMonths	8407000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	37629000	USD
CY2020Q4	us-gaap	Finance Lease Liability Payments Due Year Two FinanceLeaseLiabilityPaymentsDueYearTwo	8972000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	29014000	USD
CY2020Q4	us-gaap	Finance Lease Liability Payments Due Year Three FinanceLeaseLiabilityPaymentsDueYearThree	8281000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	21048000	USD
CY2020Q4	us-gaap	Finance Lease Liability Payments Due Year Four FinanceLeaseLiabilityPaymentsDueYearFour	8248000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Five LesseeOperatingLeaseLiabilityPaymentsDueYearFive	14672000	USD
CY2020Q4	us-gaap	Finance Lease Liability Payments Due Year Five FinanceLeaseLiabilityPaymentsDueYearFive	7573000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due After Year Five LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFive	25064000	USD
CY2020Q4	us-gaap	Finance Lease Liability Payments Due After Year Five FinanceLeaseLiabilityPaymentsDueAfterYearFive	31632000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	172768000	USD
CY2020Q4	us-gaap	Finance Lease Liability Payments Due FinanceLeaseLiabilityPaymentsDue	73113000	USD
CY2020Q4	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	21760000	USD
CY2020Q4	us-gaap	Finance Lease Liability Undiscounted Excess Amount FinanceLeaseLiabilityUndiscountedExcessAmount	12235000	USD
CY2020Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	151008000	USD
CY2020Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	60878000	USD
CY2020	us-gaap	Number Of Operating Segments NumberOfOperatingSegments	2	segment
CY2020	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	3144097000	USD
CY2020	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	3144097000	USD
CY2019	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	3412190000	USD
CY2019	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	3412190000	USD
CY2018	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	3300303000	USD
CY2018	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	3300303000	USD
CY2020	clh	Income Loss From Continuing Operations Before Interest Tax Depreciation And Amortization Net IncomeLossFromContinuingOperationsBeforeInterestTaxDepreciationAndAmortizationNet	555302000	USD
CY2019	clh	Income Loss From Continuing Operations Before Interest Tax Depreciation And Amortization Net IncomeLossFromContinuingOperationsBeforeInterestTaxDepreciationAndAmortizationNet	540317000	USD
CY2018	clh	Income Loss From Continuing Operations Before Interest Tax Depreciation And Amortization Net IncomeLossFromContinuingOperationsBeforeInterestTaxDepreciationAndAmortizationNet	491005000	USD
CY2020	clh	Accretion Of Environmental Liabilities AccretionOfEnvironmentalLiabilities	11051000	USD
CY2019	clh	Accretion Of Environmental Liabilities AccretionOfEnvironmentalLiabilities	10136000	USD
CY2018	clh	Accretion Of Environmental Liabilities AccretionOfEnvironmentalLiabilities	9806000	USD
CY2020	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	292915000	USD
CY2019	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	300725000	USD
CY2018	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	298625000	USD
CY2020	us-gaap	Operating Income Loss OperatingIncomeLoss	251336000	USD
CY2019	us-gaap	Operating Income Loss OperatingIncomeLoss	229456000	USD
CY2018	us-gaap	Operating Income Loss OperatingIncomeLoss	182574000	USD
CY2020	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-290000	USD
CY2019	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	2897000	USD
CY2018	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-4510000	USD
CY2020	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	0	USD
CY2019	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-6131000	USD
CY2018	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-2488000	USD
CY2020	us-gaap	Gain Loss On Sale Of Business GainLossOnSaleOfBusiness	-3376000	USD
CY2019	us-gaap	Gain Loss On Sale Of Business GainLossOnSaleOfBusiness	687000	USD
CY2018	us-gaap	Gain Loss On Sale Of Business GainLossOnSaleOfBusiness	0	USD
CY2020	clh	Interest Expense Net InterestExpenseNet	73120000	USD
CY2019	clh	Interest Expense Net InterestExpenseNet	78670000	USD
CY2018	clh	Interest Expense Net InterestExpenseNet	81094000	USD
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	174550000	USD
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	148239000	USD
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	94482000	USD
CY2020Q4	us-gaap	Property Plant And Equipment And Finance Lease Right Of Use Asset After Accumulated Depreciation And Amortization PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization	1525298000	USD
CY2019Q4	us-gaap	Property Plant And Equipment And Finance Lease Right Of Use Asset After Accumulated Depreciation And Amortization PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization	1588151000	USD
CY2020Q4	us-gaap	Intangible Assets Net Including Goodwill IntangibleAssetsNetIncludingGoodwill	913643000	USD
CY2019Q4	us-gaap	Intangible Assets Net Including Goodwill IntangibleAssetsNetIncludingGoodwill	944079000	USD
CY2020Q4	us-gaap	Property Plant And Equipment And Finance Lease Right Of Use Asset After Accumulated Depreciation And Amortization PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization	1525298000	USD
CY2020Q4	clh	Property Plant And Equipment Net Percent PropertyPlantAndEquipmentNetPercent	1.000
CY2019Q4	us-gaap	Property Plant And Equipment And Finance Lease Right Of Use Asset After Accumulated Depreciation And Amortization PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization	1588151000	USD
CY2019Q4	clh	Property Plant And Equipment Net Percent PropertyPlantAndEquipmentNetPercent	1.000
CY2020Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	386620000	USD
CY2020Q4	clh	Intangible Assets Net Excluding Goodwill Percent IntangibleAssetsNetExcludingGoodwillPercent	1.000
CY2019Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	419066000	USD
CY2019Q4	clh	Intangible Assets Net Excluding Goodwill Percent IntangibleAssetsNetExcludingGoodwillPercent	1.000
CY2020Q4	us-gaap	Assets Assets	4131520000	USD
CY2019Q4	us-gaap	Assets Assets	4108904000	USD

Files In Submission

Name	View Source	Status
0000822818-21-000003-index-headers.html	Edgar Link	pending
0000822818-21-000003-index.html	Edgar Link	pending
0000822818-21-000003.txt	Edgar Link	pending
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$CLH
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2019 Q4 Form 10-K Financial Statement

#000082281821000003 Filed on February 24, 2021

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$CLH CLEAN HARBORS INC Stock $clh

2019 Q4 Form 10-K Financial Statement

#000082281821000003 Filed on February 24, 2021

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$CLH
CLEAN HARBORS INC Stock $clh