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Fair Value Measurements (Detail) - USD ($) $ in Millions | Sep. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Long-term Debt, Fair Value | $ 503.2 | $ 653.3
Debt Instrument, Repurchase Amount | 30.0 |
Term Loan [Member] |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Long-term Debt, Fair Value | 0.0 | 49.8
Senior Note Due 2025 [Member] |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Long-term Debt, Fair Value | 265.3 | 324.6
Senior Note Due 2028 [Member] |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Long-term Debt, Fair Value | $ 237.9 | $ 278.9

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- 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

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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
Name: | us-gaap_FairValueOptionQuantitativeDisclosuresLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- 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

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

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- Details
Name: | us-gaap_DebtInstrumentAxis=clw_SeniorNoteDue2025Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DebtInstrumentAxis=clw_SeniorNoteDue2028Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |