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FINANCING ARRANGEMENTS (Schedule of Redemption Prices) (Details) - Senior Notes | 12 Months Ended
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Dec. 31, 2017
Senior unsecured notes, at 5.25%, due August 1, 2020 (2020 Notes) |
Debt Instrument [Line Items] |
Prior to period one | 101.313%
After to period one | 100.00%
Senior unsecured notes, at 5.125%, due June 1, 2021 (2021 Notes) |
Debt Instrument [Line Items] |
Prior to period one | 101.281%
After to period one | 100.00%

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- Definition Represents the redemption price as a percentage of the principal amount at which the debt instrument may be redeemed during the 12-month period commencing on August 15, 2012. + References No definition available. + Details
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Period Type: | duration

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- Definition Represents the redemption price as a percentage of the principal amount at which the debt instrument may be redeemed during the 12-month period commencing on August 15, 2013. + References No definition available. + Details
Name: | clh_LongTermDebtRedemptionPriceDuringTwelveMonthPeriodYear2AsPercentageOfPrincipalAmount
Namespace Prefix: | clh_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- 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
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- Details
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- Details
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- Details
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