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Non-controlling Interests (Details) - USD ($) $ in Thousands				6 Months Ended	12 Months Ended
	Nov. 16, 2020	Sep. 01, 2020	May 28, 2019	Jun. 30, 2020	Dec. 31, 2020	May 31, 2015
Passport | Variable Interest Entity, Not Primary Beneficiary
Noncontrolling Interest [Line Items]
Noncontrolling interest, increase from business combination		$ 25,700
Interest in investment	30.00%	30.00%	30.00%
Requirement to acquire ownership, consideration, amount		$ 20,000
Gain on consolidation					$ 5,700
Non-Controlling Interests
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Non-controlling interests balance as of beginning of period				$ 6,889	$ 6,889
Reclassification of non-controlling interests				(6,889)
Non-controlling interests balance as of end of period				$ 0
Evolent Health LLC
Noncontrolling Interest [Line Items]
Parent's ownership percentage						70.30%

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