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Reserves for Claims and Performance-Based Arrangements (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Liability for Unpaid Claims and Claims Adjustment Expense, Period Increase (Decrease) [Abstract]
Beginning balance	$ 188,686	$ 61,150
Incurred costs related to current year	383,479	379,206
Incurred costs related to prior year	378	3,815
Paid costs related to current year	249,311	390,613
Paid costs related to prior year	124,915	16,043
Change during the year	9,631	(23,635)
Impact of consolidation on reserves for claims and performance-based arrangements	0	164,297
Disposal of discontinued operations	(13,194)	0
Other adjustments	6,755	6,501
Ending balance	191,878	208,313
Evolent Health Services
Liability for Unpaid Claims and Claims Adjustment Expense, Period Increase (Decrease) [Abstract]
Beginning balance	56,295	4,265
Incurred costs related to current year	8,669	2,376
Incurred costs related to prior year	527	2,319
Paid costs related to current year	20,801	74,939
Paid costs related to prior year	19,174	1,608
Change during the year	(30,779)	(71,852)
Impact of consolidation on reserves for claims and performance-based arrangements	0	164,297
Disposal of discontinued operations	0	0
Other adjustments	(2,047)	501
Ending balance	23,469	97,211
Clinical Solutions
Liability for Unpaid Claims and Claims Adjustment Expense, Period Increase (Decrease) [Abstract]
Beginning balance	122,532	50,245
Incurred costs related to current year	340,582	313,259
Incurred costs related to prior year	92	8
Paid costs related to current year	205,236	260,660
Paid costs related to prior year	98,363	7,460
Change during the year	37,075	45,147
Impact of consolidation on reserves for claims and performance-based arrangements	0	0
Disposal of discontinued operations	0	0
Other adjustments	8,802	6,000
Ending balance	168,409	101,392
True Health
Liability for Unpaid Claims and Claims Adjustment Expense, Period Increase (Decrease) [Abstract]
Beginning balance	9,859	6,640
Incurred costs related to current year	34,228	63,571
Incurred costs related to prior year	(241)	1,488
Paid costs related to current year	23,274	55,014
Paid costs related to prior year	7,378	6,975
Change during the year	3,335	3,070
Impact of consolidation on reserves for claims and performance-based arrangements	0	0
Disposal of discontinued operations	(13,194)	0
Other adjustments	0	0
Ending balance	$ 0	$ 9,710

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- Definition

Current Year Claims And Claims Adjustment Expense, Including Cost Of Goods And Services Sold, Excluding Depreciation And Amortization

+ References

No definition available.

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Liability For Unpaid Claims And Claims Adjustment Expense, Disposal Of Discontinued Operations

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- Definition

The amount needed to reflect the estimated ultimate cost of settling claims relating to insured events that have occurred on or before the balance sheet date, whether or not reported to the insurer at that date.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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Amount of increase (decrease) in the cost of settling unpaid claims after deduction of reinsurance recoveries related to the acquisition of a business. Includes, but is not limited to, claims which have been incurred but not reported.

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Amount, after effects of reinsurance, of payments to settle claims incurred in the current period and related claims settlement costs.

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Amount, after effects of reinsurance, of payments to settle claims incurred in prior periods and related claims settlement costs.

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Sum of adjustments to the estimated reserve for unpaid claims and claims adjustment expense.

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Amount, after effects of reinsurance, of increase (decrease) in the liability for unpaid claims and claims adjustment expense.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount, after effects of reinsurance, of expense (reversal of expense) for claims incurred in prior reporting periods and related claims settlement costs.

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