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Document And Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2020
Feb. 19, 2021
Jun. 30, 2020
Cover [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2020    
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2020    
Entity Registrant Name ADDUS HOMECARE CORPORATION    
Entity Central Index Key 0001468328    
Trading Symbol ADUS    
Current Fiscal Year End Date --12-31    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity Shell Company false    
Entity Common Stock, Shares Outstanding   15,826,284  
Entity Public Float     $ 1,335,406,000
Entity Well-known Seasoned Issuer No    
Entity Current Reporting Status No    
Entity Voluntary Filers No    
Entity Interactive Data Current No    
Title of 12(b) Security Common Stock, $0.001 par value    
Security Exchange Name NASDAQ    
Entity File Number 001-34504    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 20-5340172    
Entity Address, Address Line One 6303 Cowboys Way    
Entity Address, Address Line Two Suite 600    
Entity Address, City or Town Frisco    
Entity Address, State or Province TX    
Entity Address, Postal Zip Code 75034    
City Area Code 469    
Local Phone Number 535-8200    
Document Annual Report true    
Document Transition Report false    
ICFR Auditor Attestation Flag true    
Documents Incorporated by Reference

Certain portions of the registrant’s Definitive Proxy Statement for its 2021 Annual Meeting of Stockholders (which is expected to be filed with the Commission within 120 days after the end of the registrant’s 2020 fiscal year) are incorporated by reference into Part III of this Annual Report on Form 10-K.