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Non-controlling Interests (Details) - USD ($) $ in Thousands				3 Months Ended	9 Months Ended	12 Months Ended
	Nov. 16, 2020	Sep. 01, 2020	May 28, 2019	Sep. 30, 2020	Sep. 30, 2020	Dec. 31, 2020	May 31, 2015
Noncontrolling Interest [Line Items]
Consolidation of equity method investment				$ 4,626	$ 4,626
Passport | Variable Interest Entity, Not Primary Beneficiary
Noncontrolling Interest [Line Items]
Consolidation of equity method investment		$ 25,700
Interest in investment	30.00%	30.00%	30.00%
Requirement to acquire ownership, consideration, amount		$ 20,000
Gain on consolidation						$ 5,700
Evolent Health LLC
Noncontrolling Interest [Line Items]
Parent's ownership percentage							70.30%

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Variable Interest Entity, New Medicaid Contract Not Awarded, Requirement To Acquire Ownership, Consideration, Amount

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