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Cover Page - USD ($)
 12 Months Ended
Dec. 31, 2019
Feb. 19, 2020
Jun. 30, 2019
Cover page.      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2019    
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    
Entity Shell Company false    
Entity Public Float     $ 753,609,332
Entity Common Stock, Shares Outstanding   22,712,952  
Documents Incorporated by Reference
Document  Parts Into Which
Incorporated
Portions of Proxy Statement for the Annual Meeting of Shareholders scheduled to be held April 28, 2020 (“Proxy Statement”)  Part III
    
Amendment Flag false    
Entity Central Index Key 0000930420    
Document Fiscal Year Focus 2019    
Document Fiscal Period Focus FY    
Current Fiscal Year End Date --12-31