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Cover - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Feb. 21, 2025
Jun. 30, 2024
Cover [Abstract]      
Current Fiscal Year End Date --12-31    
Entity Well-known Seasoned Issuer No    
Document Type 10-K/A    
Document Annual Report true    
Document Transition Report false    
Entity File Number 001-34146    
Registrant Name CLEARWATER PAPER CORPORATION    
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 Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Document Financial Statement Error Correction [Flag] false    
Entity Shell Company false    
Entity Public Float     $ 788.5
Entity Common Stock, Shares Outstanding   16,175,161  
Amendment Description Clearwater Paper Corporation (the “Company”) is filing this Amendment No. 1 on Form 10-K/A (this “Amendment”) to amend the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2024 (the “Original Filing”), which was originally filed with the U.S. Securities and Exchange Commission (the “SEC”) on February 24, 2025 (the “Original Filing Date”). The sole purpose of this Amendment is to amend the Exhibits contained in Item 15 of Part IV of the Original Filing to include Exhibit 19.1, Clearwater Paper Corporation Insider Trading Policy, which was inadvertently omitted in the Original Filing.This Amendment is an exhibit-only filing. Except as described above, no changes have been made to the Original Filing and this Amendment does not modify, amend, or update in any way any of the financial or other information contained in the Original Filing. This Amendment does not reflect events that may have occurred subsequent to the Original Filing Date. Accordingly, this Amendment should be read in conjunction with the Original Filing and the Company’s other filings with the SEC.Pursuant to Rule 12b-15 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), currently dated certifications are filed herewith as exhibits to this Amendment pursuant to Rule 13a-14(a) or 15d-14(a) of the Exchange Act. These certifications are attached to this Amendment as Exhibit 31.1 under Item 15 of Part IV hereof. Because no financial statements are being filed with this Amendment and this Amendment does not contain any disclosure with respect to Items 307 and 308 of Regulation S-K, paragraphs 3, 4, and 5 of the certifications have been omitted. Similarly, because no financial statements are being filed with this Amendment, certifications pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 have been omitted.    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Document Fiscal Year Focus 2024    
Central Index Key 0001441236    
Amendment Flag true    
Document Period End Date Dec. 31, 2024    
Document Information [Line Items]      
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2024    
Document Period End Date Dec. 31, 2024    
Current Fiscal Year End Date --12-31