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Cover Page - USD ($)
 12 Months Ended
Dec. 31, 2020
Jun. 30, 2020
Cover [Abstract]    
Document Type 10-K  
Document Annual Report true  
Document Period End Date Dec. 31, 2020  
Document Transition Report false  
Entity File Number 000-26058  
Entity Registrant Name Kforce Inc.  
Entity Incorporation, State or Country Code FL  
Entity Tax Identification Number 59-3264661  
Entity Address, Address Line One 1001 East Palm Avenue  
Entity Address, City or Town Tampa  
Entity Address, State or Province FL  
Entity Address, Postal Zip Code 33605  
City Area Code 813  
Local Phone Number 552-5000  
Title of 12(b) Security Common Stock, $0.01 per share  
Trading Symbol KFRC  
Security Exchange Name NASDAQ  
Entity Well-known Seasoned Issuer No  
Entity Voluntary Filers No  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Large Accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
ICFR Auditor Attestation Flag true  
Entity Shell Company false  
Entity Public Float   $ 579,330,209
Entity Common Stock, Shares Outstanding 22,087,029  
Documents Incorporated by Reference
Document  Parts Into Which
Incorporated
Portions of Proxy Statement for the Annual Meeting of Shareholders scheduled to be held April 22, 2021 (“Proxy Statement”)  Part III
  
Amendment Flag false  
Entity Central Index Key 0000930420  
Document Fiscal Year Focus 2020  
Document Fiscal Period Focus FY  
Current Fiscal Year End Date --12-31