XML 99 R86.htm IDEA: XBRL DOCUMENT
v3.22.0.1

FINANCING ARRANGEMENTS - Narrative (Details) - USD ($) |  |  |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Oct. 08, 2021 | Oct. 28, 2020 | Mar. 31, 2020 | Jul. 02, 2019 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Jan. 31, 2022 | Dec. 31, 2018
Financing arrangements |  |  |  |  |  |  |  |  |
Effective interest rate (as a percent) |  |  |  |  | 4.67% |  |  |  |
Loss on early extinguishment of debt |  |  |  |  | $ 0 | $ 0 | $ 6,131,000 |  |
Fair value of long-term obligations, including current portion |  |  |  |  | 2,600,000,000 | 1,600,000,000 |  |  |
Borrowings from revolving credit facility |  |  |  |  | 0 | 150,000,000 | $ 0 |  |
Revolving credit facility, available borrowing capacity |  |  |  |  | 261,400,000 |  |  |  |
Letters of credit outstanding, amount |  |  |  |  | 138,600,000 |  |  |  |
Derivative liability |  |  |  |  | $ 17,400,000 | 33,600,000 |  |  |
Interest rate swap |  |  |  |  |  |  |  |  |
Financing arrangements |  |  |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) |  |  |  |  | 2.92% |  |  |  |
Derivative notional amount |  |  |  |  |  |  |  |  | $ 350,000,000
Interest rate swap | Subsequent Event |  |  |  |  |  |  |  |  |
Financing arrangements |  |  |  |  |  |  |  |  |
Derivative notional amount |  |  |  |  |  |  |  | $ 600,000,000 |
Interest rate swap | Subsequent Event | Through June 30, 2023 |  |  |  |  |  |  |  |  |
Financing arrangements |  |  |  |  |  |  |  |  |
Derivative, fixed interest rate |  |  |  |  |  |  |  | 0.931% |
Interest rate swap | Subsequent Event | From July 1, 2023 through September 30, 2027 |  |  |  |  |  |  |  |  |
Financing arrangements |  |  |  |  |  |  |  |  |
Derivative, fixed interest rate |  |  |  |  |  |  |  | 1.9645% |
Secured senior term loans due October 8, 2028 ("2028 Term Loans") | Subsequent Event |  |  |  |  |  |  |  |  |
Financing arrangements |  |  |  |  |  |  |  |  |
Debt outstanding |  |  |  |  |  |  |  | $ 600,000,000 |
Term Loans with Interest Rate Swap Agreements |  |  |  |  |  |  |  |  |
Financing arrangements |  |  |  |  |  |  |  |  |
Debt outstanding |  |  |  |  |  |  |  |  | $ 350,000,000
Unsecured debt |  |  |  |  |  |  |  |  |
Financing arrangements |  |  |  |  |  |  |  |  |
Redemption percentage of principal amount |  |  |  |  | 100.00% |  |  |  |
Debt instrument, redemption price, percentage of principal amount redeemed |  |  |  |  | 35.00% |  |  |  |
Unsecured debt | Unsecured senior notes, at 4.875%, due July 15, 2027 ("2027 Notes") |  |  |  |  |  |  |  |  |
Financing arrangements |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  | $ 545,000,000 |  |  |  |  |
Redemption percentage of principal amount |  |  |  |  | 104.875% |  |  |  |
Unsecured debt | Unsecured senior notes, at 5.125%, due July 15, 2029 ("2029 Notes") |  |  |  |  |  |  |  |  |
Financing arrangements |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  | 300,000,000 |  |  |  |  |
Redemption percentage of principal amount |  |  |  |  | 105.125% |  |  |  |
Unsecured debt | Unsecured Senior Notes 2021 |  |  |  |  |  |  |  |  |
Financing arrangements |  |  |  |  |  |  |  |  |
Repurchased amount |  |  |  | 845,000,000 |  |  |  |  |
Repayments of debt |  |  |  | 850,200,000 |  |  |  |  |
Accrued interest |  |  |  | $ 4,000,000 |  |  |  |  |
Secured debt | Secured senior term loans due October 8, 2028 ("2028 Term Loans") |  |  |  |  |  |  |  |  |
Financing arrangements |  |  |  |  |  |  |  |  |
Debt prepayment premium rate, percentage | 1.00% |  |  |  |  |  |  |  |
Secured debt | Secured senior term loans due October 8, 2028 ("2028 Term Loans") | Eurodollar |  |  |  |  |  |  |  |  |
Financing arrangements |  |  |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) | 2.00% |  |  |  |  |  |  |  |
Debt, floor interest rate | 0.00% |  |  |  |  |  |  |  |
Secured debt | Secured senior term loans due October 8, 2028 ("2028 Term Loans") | Base rate |  |  |  |  |  |  |  |  |
Financing arrangements |  |  |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) | 1.00% |  |  |  |  |  |  |  |
Debt, floor interest rate | 1.00% |  |  |  |  |  |  |  |
Secured debt | Secured senior term loans due October 8, 2028 ("2028 Term Loans") | HydroChemPSC |  |  |  |  |  |  |  |  |
Financing arrangements |  |  |  |  |  |  |  |  |
Aggregate principal amount | $ 1,000,000,000 |  |  |  |  |  |  |  |
Net proceeds from the company’s issuance | $ 981,300,000 |  |  |  |  |  |  |  |
Secured debt | Secured senior term loans due June 30, 2024 ("2024 Term Loans") |  |  |  |  |  |  |  |  |
Financing arrangements |  |  |  |  |  |  |  |  |
Debt outstanding |  |  |  |  | $ 719,600,000 |  |  |  |
Secured debt | Secured senior term loans due June 30, 2024 ("2024 Term Loans") | Eurodollar |  |  |  |  |  |  |  |  |
Financing arrangements |  |  |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) | 1.75% |  |  |  |  |  |  |  |
Secured debt | Secured senior term loans due June 30, 2024 ("2024 Term Loans") | Base rate |  |  |  |  |  |  |  |  |
Financing arrangements |  |  |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) | 0.75% |  |  |  |  |  |  |  |
Secured debt | Secured senior term loans |  |  |  |  |  |  |  |  |
Financing arrangements |  |  |  |  |  |  |  |  |
Effective interest rate (as a percent) |  |  |  |  | 2.04% |  |  |  |
LIne of credit |  |  |  |  |  |  |  |  |
Financing arrangements |  |  |  |  |  |  |  |  |
Credit facility, maximum borrowing capacity |  |  |  |  | $ 400,000,000 |  |  |  |
Period for measurement of average liquidity (in days) |  |  |  |  | 30 days |  |  |  |
LIne of credit | Minimum |  |  |  |  |  |  |  |  |
Financing arrangements |  |  |  |  |  |  |  |  |
Commitment fee (as a percent) |  |  |  |  | 0.25% |  |  |  |
LIne of credit | Maximum |  |  |  |  |  |  |  |  |
Financing arrangements |  |  |  |  |  |  |  |  |
Commitment fee (as a percent) |  |  |  |  | 0.375% |  |  |  |
LIne of credit | Parent and Domestic Subsidiaries |  |  |  |  |  |  |  |  |
Financing arrangements |  |  |  |  |  |  |  |  |
Credit available subject to percentage of accounts receivable (as a percent) |  | 85.00% |  |  |  |  |  |  |
Credit available subject to percentage of cash deposited (as a percent) |  | 100.00% |  |  |  |  |  |  |
LIne of credit | Canadian Subsidiaries |  |  |  |  |  |  |  |  |
Financing arrangements |  |  |  |  |  |  |  |  |
Credit available subject to percentage of accounts receivable (as a percent) |  | 85.00% |  |  |  |  |  |  |
Credit available subject to percentage of cash deposited (as a percent) |  | 100.00% |  |  |  |  |  |  |
LIne of credit | Revolving credit facility |  |  |  |  |  |  |  |  |
Financing arrangements |  |  |  |  |  |  |  |  |
Debt outstanding |  |  |  |  | $ 0 | $ 0 |  |  |
Borrowings from revolving credit facility |  |  | $ 150,000,000 |  |  |  |  |  |
LIne of credit | Revolving credit facility | Parent and Domestic Subsidiaries |  |  |  |  |  |  |  |  |
Financing arrangements |  |  |  |  |  |  |  |  |
Credit facility, maximum borrowing capacity |  | $ 350,000,000 |  |  |  |  |  |  |
LIne of credit | Revolving credit facility | Canadian Subsidiaries |  |  |  |  |  |  |  |  |
Financing arrangements |  |  |  |  |  |  |  |  |
Credit facility, maximum borrowing capacity |  | 50,000,000 |  |  |  |  |  |  |
LIne of credit | Letters of credit | Parent and Domestic Subsidiaries |  |  |  |  |  |  |  |  |
Financing arrangements |  |  |  |  |  |  |  |  |
Credit facility, maximum borrowing capacity |  | $ 250,000,000 |  |  |  |  |  |  |
LIne of credit | Base rate | Minimum |  |  |  |  |  |  |  |  |
Financing arrangements |  |  |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) |  |  |  |  | 0.50% |  |  |  |
LIne of credit | Base rate | Maximum |  |  |  |  |  |  |  |  |
Financing arrangements |  |  |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) |  |  |  |  | 0.75% |  |  |  |
LIne of credit | LIBOR | Minimum |  |  |  |  |  |  |  |  |
Financing arrangements |  |  |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) |  |  |  |  | 1.50% |  |  |  |
LIne of credit | LIBOR | Maximum |  |  |  |  |  |  |  |  |
Financing arrangements |  |  |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) |  |  |  |  | 1.75% |  |  |  |

X
- Definition Credit Available Subject to Percentage of Accounts Receivable + References No definition available. + Details
Name: | clh_CreditAvailableSubjecttoPercentageofAccountsReceivable
Namespace Prefix: | clh_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Credit Available Subject to Percentage of Cash Deposited + References No definition available. + Details
Name: | clh_CreditAvailableSubjecttoPercentageofCashDeposited
Namespace Prefix: | clh_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Debt Instrument, Floor Interest Rate + References No definition available. + Details
Name: | clh_DebtInstrumentFloorInterestRate
Namespace Prefix: | clh_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Debt Instrument, Prepayment Premium Rate, Percentage + References No definition available. + Details
Name: | clh_DebtInstrumentPrepaymentPremiumRatePercentage
Namespace Prefix: | clh_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Debt Instrument, Spread on Variable Rate, Period for Measurement of Average Liquidity + References No definition available. + Details
Name: | clh_DebtInstrumentSpreadonVariableRatePeriodforMeasurementofAverageLiquidity
Namespace Prefix: | clh_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1B -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495323-112611 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=124435984&loc=d3e28551-108399 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=124429444&loc=SL124452920-239629 Reference 5: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 55 -Paragraph 69C -URI http://asc.fasb.org/extlink&oid=123466577&loc=SL123495737-112612 Reference 6: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 55 -Paragraph 69B -URI http://asc.fasb.org/extlink&oid=123466577&loc=SL123495735-112612 + Details
Name: | us-gaap_DebtInstrumentFaceAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Increase for accrued, but unpaid interest on the debt instrument for the period. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(f)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 + Details
Name: | us-gaap_DebtInstrumentIncreaseAccruedInterest
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123466204&loc=SL6036836-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=124435984&loc=d3e28551-108399 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=124429444&loc=SL124452920-239629 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_DebtInstrumentInterestRateEffectivePercentage
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage price of original principal amount of debt at which debt can be redeemed by the issuer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph e -URI http://asc.fasb.org/extlink&oid=123599511&loc=d3e64711-112823 + Details
Name: | us-gaap_DebtInstrumentRedemptionPricePercentage
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of principal amount of debt redeemed. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentRedemptionPricePercentageOfPrincipalAmountRedeemed
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Fair value amount of debt instrument that was repurchased. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentRepurchaseAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Fixed interest rate related to the interest rate derivative. + References No definition available. + Details
Name: | us-gaap_DerivativeFixedInterestRate
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=123594938&loc=d3e13433-108611 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226052-175313 + Details
Name: | us-gaap_DerivativeLiabilities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Nominal or face amount used to calculate payment on derivative. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=125515794&loc=SL5580258-113959 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=125515794&loc=SL5579245-113959 + Details
Name: | us-gaap_DerivativeNotionalAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

X
- Definition Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=123467658&loc=d3e12355-112629 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 50 -Section 40 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=123467658&loc=d3e12317-112629 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3602-108585 + Details
Name: | us-gaap_GainsLossesOnExtinguishmentOfDebt
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
Name: | us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used. + References No definition available. + Details
Name: | us-gaap_LineOfCreditFacilityCommitmentFeePercentage
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=123466204&loc=SL6031897-161870 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 55 -Paragraph 69C -URI http://asc.fasb.org/extlink&oid=123466577&loc=SL123495737-112612 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 55 -Paragraph 69B -URI http://asc.fasb.org/extlink&oid=123466577&loc=SL123495735-112612 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 1D -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123466505&loc=SL123495340-112611 Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_LongTermDebt
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The fair value amount of long-term debt whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. + References No definition available. + Details
Name: | us-gaap_LongTermDebtFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3255-108585 + Details
Name: | us-gaap_ProceedsFromIssuanceOfDebt
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3255-108585 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(f)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 + Details
Name: | us-gaap_ProceedsFromLinesOfCredit
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3291-108585 + Details
Name: | us-gaap_RepaymentsOfDebt
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=us-gaap_InterestRateSwapMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | clh_DerivativeFixedInterestRatePeriodAxis=clh_DerivativeFixedInterestRatePeriodOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | clh_DerivativeFixedInterestRatePeriodAxis=clh_DerivativeFixedInterestRatePeriodTwoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=clh_A2028TermLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=clh_TermLoanswithInterestRateSwapAgreementsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=us-gaap_UnsecuredDebtMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=clh_SeniorUnsecuredNotesdue2027Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=clh_SeniorUnsecuredNotesdue2029Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=clh_UnsecuredSeniorNotes2021Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=us-gaap_SecuredDebtMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_VariableRateAxis=us-gaap_EurodollarMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_VariableRateAxis=us-gaap_BaseRateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=clh_HydroChemPSCMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=clh_A2024TermLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=clh_TermLoanAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LongtermDebtTypeAxis=us-gaap_LineOfCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=clh_ParentandDomesticSubsidiariesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=clh_CanadianSubsidiariesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CreditFacilityAxis=us-gaap_LetterOfCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_VariableRateAxis=us-gaap_LondonInterbankOfferedRateLIBORMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |