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v3.19.2

Taxes - Narrative (Detail) | 6 Months Ended
--- | ---
Jun. 30, 2019 Rate | Jun. 30, 2018 Rate
Operating Loss Carryforwards [Line Items] |  |
Estimated Annual Effective Tax Rate | 59.00% | 26.00%

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- Definition Estimated Annual Effective Tax Rate + References No definition available. + Details
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Namespace Prefix: | clw_
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
Name: | us-gaap_OperatingLossCarryforwardsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration