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REVENUES - Contract Balances (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
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Revenue from Contract with Customer [Abstract] |  |
Receivables | $ 1,015,357 | $ 983,111
Contract assets (unbilled receivables) | 162,215 | 107,859
Contract liabilities (deferred revenue) | $ 88,545 | $ 95,230

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- Definition The aggregate amount of unbilled receivables due for services rendered or to be rendered at the financial statement date, which are usually due within one year (or one business cycle). + References No definition available. + Details
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Namespace Prefix: | clh_
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Balance Type: | debit
Period Type: | instant

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- Definition Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481990/310-10-45-2 + Details
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Balance Type: | debit
Period Type: | instant

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- Definition Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as current. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479837/606-10-45-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 8 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479806/606-10-50-8 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 606 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479837/606-10-45-2 + Details
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Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
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