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Segment Reporting - Revenue from Segments to Consolidated (Details) - USD ($) $ in Thousands		3 Months Ended								12 Months Ended
		Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues		$ 248,358	$ 222,471	$ 222,057	$ 215,071	$ 246,536	$ 239,572	$ 217,299	$ 221,232	$ 907,957	$ 924,639	$ 687,122
Adjusted EBITDA										66,317	48,573	(13,831)
Evolent Health Services
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues										311,627	385,134	409,531
Adjusted EBITDA										17,063	57,731	(561)
Clinical Solutions
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues										598,144	542,279	278,217
Adjusted EBITDA										82,920	26,864	12,523
Intersegment Eliminations
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues										(1,814)	(2,774)	(626)
Operating Segments
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues										907,957	924,639	687,122
Adjusted EBITDA										99,983	84,595	11,962
Corporate
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues										0	0	0
Adjusted EBITDA										(33,666)	(36,022)	(25,793)
Transformation services
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	[1]									11,204	11,990	15,203
Transformation services | Evolent Health Services
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues										11,204	11,990	15,203
Transformation services | Clinical Solutions
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues										0	0	0
Transformation services | Intersegment Eliminations
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues										0	0	0
Transformation services | Operating Segments
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues										11,204	11,990	15,203
Transformation services | Corporate
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues										0	0	0
Platform and operations services
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues	[1]									896,753	912,649	671,919
Platform and operations services | Evolent Health Services
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues										300,423	373,144	394,328
Platform and operations services | Clinical Solutions
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues										598,144	542,279	278,217
Platform and operations services | Intersegment Eliminations
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues										(1,814)	(2,774)	(626)
Platform and operations services | Operating Segments
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues										896,753	912,649	671,919
Platform and operations services | Corporate
Segment Reporting, Revenue Reconciling Item [Line Items]
Revenues										$ 0	$ 0	$ 0
[1] See Note 20 for amounts attributable to unconsolidated related parties included in these line items.

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