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Cover Page - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Feb. 21, 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 001-37415    
Entity Registrant Name Evolent Health, Inc.    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 32-0454912    
Entity Address, Address Line One 800 N. Glebe Road    
Entity Address, Address Line Two Suite 500    
Entity Address, City or Town Arlington    
Entity Address, State or Province VA    
Entity Address, Postal Zip Code 22203    
City Area Code 571    
Local Phone Number 389-6000    
Title of 12(b) Security Class A Common Stock of Evolent Health, Inc., par value $0.01 per share    
Trading Symbol EVH    
Security Exchange Name NYSE    
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    
Entity Shell Company false    
Entity Public Float     $ 600.0
Entity Common Stock, Shares Outstanding (in shares)   84,722,479  
Entity Central Index Key 0001628908    
Amendment Flag false    
Current Fiscal Year End Date --12-31    
Document Fiscal Year Focus 2019    
Document Fiscal Period Focus FY    
Documents Incorporated by Reference
Selected portions of the Proxy Statement for the Annual Meeting of Shareholders, scheduled for June 9, 2020, have been incorporated by reference into Part III of this Form 10-K to the extent stated herein. Such proxy statement will be filed with the Securities and Exchange Commission within 120 days of the registrant’s fiscal year ended December 31, 2019.