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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%

X

- Definition

Estimated Annual Effective Tax Rate

+ References

No definition available.

+ Details

Name:	clw_EstimatedAnnualEffectiveTaxRate
Namespace Prefix:	clw_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- 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