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Business Interruption and Insurance Recovery (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
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Mar. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2016
Business Interruption and Insurance Recovery [Abstract] |  |  |
Operating Insurance and Claims Costs, Production | $ 2.9 | $ 2.9 | $ 8.5
Deductible and claims costs |  |  | 3.5
Property insurance claim payment |  |  | 5.0
Insurance claim receivable | $ 1.4 |  | $ 1.5

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- Definition Business Interruption and Insurance Recovery [Abstract] + References No definition available. + Details
Name: | clw_BusinessInterruptionandInsuranceRecoveryAbstract
Namespace Prefix: | clw_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Deductible and claims costs pertaining to business interruptions and insurance claim + References No definition available. + Details
Name: | clw_Deductibleandclaimscosts
Namespace Prefix: | clw_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Insurance claim receivable + References No definition available. + Details
Name: | clw_Insuranceclaimreceivable
Namespace Prefix: | clw_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Property insurance claim payment + References No definition available. + Details
Name: | clw_Propertyinsuranceclaimpayment
Namespace Prefix: | clw_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Insurance and claims costs directly related to goods produced and sold, or services rendered, during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.2(a),(d)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration