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Cover Page - USD ($)
 12 Months Ended
Dec. 31, 2023
Feb. 20, 2024
Jun. 30, 2023
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2023    
Current Fiscal Year End Date --12-31    
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 1150 Assembly Drive, Suite 500    
Entity Address, City or Town Tampa    
Entity Address, State or Province FL    
Entity Address, Postal Zip Code 33607    
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 Yes    
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     $ 911,384,374
Entity Common Stock, Shares Outstanding   19,518,000  
Documents Incorporated by Reference
DocumentParts Into Which
Incorporated
Portions of the Proxy Statement for the Annual Meeting of Shareholders scheduled to be held on April 24, 2024 (“Proxy Statement”)
Part III
    
Amendment Flag false    
Entity Central Index Key 0000930420    
Document Fiscal Year Focus 2023    
Document Fiscal Period Focus FY    
Document Financial Statement Error Correction [Flag] false