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Reserves for Claims and Performance-Based Arrangements (Details) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]    
Balance, beginning of period $ 171,294 $ 178,827
Incurred health care costs:    
Current year to date period 471,502 383,128
Prior year to date period (8,154) 619
Total claims incurred 463,348 383,747
Claims paid related to:    
Current year to date period (369,708) (250,116)
Prior year to date period (129,236) (120,580)
Total claims paid (498,944) (370,696)
Balance, end of period 135,698 191,878
Evolent Health Services    
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]    
Balance, beginning of period 25,618 56,295
Incurred health care costs:    
Current year to date period 0 6,622
Prior year to date period (5,714) 527
Total claims incurred (5,714) 7,149
Claims paid related to:    
Current year to date period 0 (20,801)
Prior year to date period (10,846) (19,174)
Total claims paid (10,846) (39,975)
Balance, end of period 9,058 23,469
Clinical Solutions    
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]    
Balance, beginning of period 145,676 122,532
Incurred health care costs:    
Current year to date period 471,502 376,506
Prior year to date period (2,440) 92
Total claims incurred 469,062 376,598
Claims paid related to:    
Current year to date period (369,708) (229,315)
Prior year to date period (118,390) (101,406)
Total claims paid (488,098) (330,721)
Balance, end of period $ 126,640 $ 168,409