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Non-controlling Interests (Details) - USD ($)
shares in Thousands, $ in Thousands
1 Months Ended 3 Months Ended 12 Months Ended
Oct. 01, 2018
May 31, 2019
Nov. 30, 2018
Mar. 31, 2018
Aug. 31, 2017
Jun. 30, 2017
May 31, 2017
Mar. 31, 2017
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Apr. 30, 2019
Oct. 31, 2018
Feb. 28, 2018
Jul. 31, 2017
May 30, 2017
Feb. 28, 2017
Jun. 05, 2015
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]                                                    
Non-controlling interests balance as of beginning-of-year                       $ 45,532         $ 45,532                  
Amount attributable to NCI / issuance of class B common stock                                 6,500 $ 0                
Net income (loss) attributable to non-controlling interests                 $ 1,197 $ 217 $ 285 1,910 $ 853 $ 126 $ 115 $ 439 3,609 1,533 $ 9,102              
Reclassification of non-controlling interests                                 0 0 $ 0              
Non-controlling interests balance as of end-of-year                 $ 6,689       $ 45,532       $ 6,689 $ 45,532                
Evolent Health LLC                                                    
Noncontrolling Interest [Line Items]                                                    
Parent's ownership percentage 95.30% 99.20% 96.10% 98.90% 96.60% 96.10% 90.50% 83.90% 100.00%       96.10% 99.00%   98.90% 100.00% 96.10% 77.40% 99.10% 95.30% 96.60% 96.10% 84.90% 77.40% 70.30%
Non-controlling Interests                                                    
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]                                                    
Non-controlling interests balance as of beginning-of-year                       $ 45,532       $ 35,427 $ 45,532 $ 35,427                
Cumulative-effect adjustment from adoption of new accounting principle                                 0 594                
Decrease in non-controlling interests as a result of Class B Exchanges                                 (42,377) (34,682)                
Net income (loss) attributable to non-controlling interests                                 (3,609) (1,533)                
Reclassification of non-controlling interests                                 643 2,939 $ 3,824              
Non-controlling interests balance as of end-of-year                 $ 6,689       $ 45,532       $ 6,689 $ 45,532 $ 35,427              
Class A Common Stock                                                    
Noncontrolling Interest [Line Items]                                                    
Issuance of common stock (in shares)         8,800                           20,100              
Proceeds from issuance of common stock, net of payments of stock issuance costs         $ 166,900                                          
Class A Common Stock | Common Stock                                                    
Noncontrolling Interest [Line Items]                                                    
Issuance of common stock (in shares)   1,600 800 3,000   4,500 7,000 7,500                 3,100   8,816              
Class A Common Stock | Investor Stockholders                                                    
Noncontrolling Interest [Line Items]                                                    
Issuance of common stock (in shares)                                     12,600              
Class A Common Stock | Investor Stockholders | Common Stock                                                    
Noncontrolling Interest [Line Items]                                                    
Issuance of common stock (in shares)           3,800 3,800 4,400                                    
Class A Common Stock | Management Selling Stockholders                                                    
Noncontrolling Interest [Line Items]                                                    
Issuance of common stock (in shares)                                     100              
Class A Common Stock | Management Selling Stockholders | Common Stock                                                    
Noncontrolling Interest [Line Items]                                                    
Issuance of common stock (in shares)             100                                      
Class A Common Stock | The Advisory Board | Common Stock                                                    
Noncontrolling Interest [Line Items]                                                    
Issuance of common stock (in shares)       1,800                                            
Class A Common Stock | TPG | Common Stock                                                    
Noncontrolling Interest [Line Items]                                                    
Issuance of common stock (in shares)     700                                              
Class B Common Stock                                                    
Noncontrolling Interest [Line Items]                                                    
Income tax expense, obligations related to exchanges                                 $ 1,300                  
Class B Common Stock | Common Stock                                                    
Noncontrolling Interest [Line Items]                                                    
Issuance of common stock (in shares)                                   3,120                
Class B Common Stock | Non-controlling Interests                                                    
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]                                                    
Amount attributable to NCI / issuance of class B common stock                                 $ 0 $ 42,787                
Evolent Health, Selling Stockholders | Class A Common Stock                                                    
Noncontrolling Interest [Line Items]                                                    
Issuance of common stock (in shares)                                     7,400              
Evolent Health, Selling Stockholders | Class A Common Stock | Common Stock                                                    
Noncontrolling Interest [Line Items]                                                    
Issuance of common stock (in shares)     100 1,200   700 3,100 3,100                                    
New Century Health | Class B Common Stock                                                    
Noncontrolling Interest [Line Items]                                                    
Consideration transferred, equity interests issued and issuable, shares issued (in shares) 3,100