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Cover
 3 Months Ended 9 Months Ended
Aug. 04, 2021
Sep. 30, 2021
Sep. 30, 2021
Document Information [Line Items]      
Document Type   8-K  
Document Period End Date Nov. 02, 2021    
Entity Registrant Name   CLEARWATER PAPER CORPORATION  
Entity Incorporation, State or Country Code   DE  
Entity File Number     001-34146
Entity Tax Identification Number     20-3594554
Entity Address, Address Line One     601 West Riverside,
Entity Address, Address Line Two     Suite 1100
Entity Address, Postal Zip Code     99201
Entity Address, State or Province     WA
Entity Address, City or Town     Spokane,
City Area Code     509
Local Phone Number     344-5900
Written Communications     false
Soliciting Material     false
Pre-commencement Tender Offer     false
Pre-commencement Issuer Tender Offer     false
Title of 12(b) Security     Common Stock, par value $0.0001 per share
Trading Symbol     CLW
Security Exchange Name     NYSE
Entity Emerging Growth Company     false
Entity Central Index Key     0001441236
Amendment Flag     false