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Commitments and Contingencies Commitments and Contingencies Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Leases Disclosure [Line Items]
Rent expense	$ 12.6	$ 14.3	$ 14.8

X

- Definition

[Line Items] for Leases Disclosure [Table]

+ References

No definition available.

+ Details

Name:	clw_LeasesDisclosureLineItems
Namespace Prefix:	clw_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line.

+ References

No definition available.

+ Details

Name:	us-gaap_LeaseAndRentalExpense
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration