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Document and Entity Information - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Feb. 20, 2025
Jun. 30, 2024
Document and Entity Information [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2024    
Current Fiscal Year End Date --12-31    
Document Fiscal Year Focus 2024    
Document Fiscal Period Focus FY    
Entity Registrant Name CLEARWATER PAPER CORPORATION    
Entity Central Index Key 0001441236    
Entity File Number 001-34146    
Entity Well-known Seasoned Issuer No    
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
Document Annual Report true    
Document Transition Report false    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 20-3594554    
Entity Address, Postal Zip Code 99201    
Entity Address, Address Line Two Suite 1100    
Entity Address, Address Line One 601 West Riverside,    
Entity Address, State or Province WA    
Entity Address, City or Town Spokane,    
City Area Code 509    
Local Phone Number 344-5900    
Title of 12(b) Security Common Stock ($0.0001 par value per share)    
Trading Symbol CLW    
Security Exchange Name NYSE    
Entity Interactive Data Current Yes    
Entity Common Stock, Shares Outstanding   16,175,161  
Entity Public Float     $ 788.5
ICFR Auditor Attestation Flag true    
Entity Shell Company false    
Document Financial Statement Error Correction [Flag] false    
Auditor Name KPMG LLP    
Auditor Location Seattle, Washington