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Segment Reporting - Reconciliation of Adjusted EBITDA (Details) - USD ($) | 3 Months Ended | 6 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, 2019 | Jun. 30, 2020 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Segment Reporting [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net loss attributable to common shareholders of Evolent Health, Inc. - Basic | $ (5,647,000) |  | $ (13,040,000) | $ (9,107,000) | $ (9,807,000) | $ (14,625,000) | $ (37,348,000) | $ (203,521,000) | $ (78,752,000) |  |  | $ (37,601,000) |  | $ (334,246,000) |  | $ (301,971,000) |
Net loss attributable to common shareholders of Evolent Health, Inc. - Diluted | (5,647,000) |  | (13,040,000) | (9,107,000) | (9,807,000) | (14,625,000) | (37,348,000) | (203,521,000) | (78,752,000) |  |  | (37,601,000) |  | (334,246,000) |  | (301,971,000) |
Interest income |  |  |  |  |  |  |  |  |  |  |  | 407,000 |  | 2,633,000 |  | 3,406,000 |
Interest expense |  |  |  |  |  |  |  |  |  |  |  | (25,425,000) |  | (28,325,000) |  | (14,555,000) |
(Provision) benefit for income taxes |  |  |  |  |  |  |  |  |  |  |  | (483,000) |  | 2,368,000 |  | 22,795,000 |
Depreciation and amortization expenses |  |  |  |  |  |  |  |  |  |  |  | (60,037,000) |  | (60,835,000) |  | (60,323,000) |
Equity method investment impairment |  |  |  |  |  |  |  |  |  |  |  | 0 |  | (47,133,000) |  | 0 |
Gain on transfer of membership |  |  |  |  |  |  |  |  |  |  |  | 45,938,000 |  | 0 |  | 0 |
Loss on repayment of debt, net |  |  |  |  |  |  |  |  |  |  |  | (21,343,000) |  | 0 |  | 0 |
Loss on extinguishment of debt |  |  |  |  |  |  |  |  |  |  |  | 0 |  | (4,789,000) |  | 0 |
Impairment |  |  |  |  |  |  |  | (215,100,000) | 0 | $ (199,800,000) | $ (215,100,000) | 0 |  | (215,100,000) |  | (199,800,000) |
Gain (loss) from equity method investees |  |  |  |  |  |  |  |  |  |  |  | 13,179,000 |  | 10,039,000 |  | (9,465,000) |
Gain (loss) on disposal of assets |  |  |  |  |  |  |  |  |  |  |  | 0 |  | (698,000) |  | 9,600,000 |
Change in fair value of contingent consideration and indemnification asset |  |  |  |  |  |  |  |  |  |  |  | (13,281,000) |  | (3,860,000) |  | 3,997,000 |
Net loss attributable to non-controlling interests |  |  |  |  |  | (822,000) | 822,000 | 0 | 0 |  |  | 0 |  | 0 |  | 3,609,000 |
Other income (expense), net |  |  |  |  |  |  |  |  |  |  |  | (146,000) |  | (118,000) |  | (489,000) |
Purchase accounting adjustments |  |  |  |  |  |  |  |  |  |  |  | 0 |  | 0 |  | (1,915,000) |
Repositioning costs |  |  |  |  |  |  |  |  |  |  |  | (7,318,000) |  | (1,275,000) |  | 0 |
Stock-based compensation expense |  |  |  |  |  |  |  |  |  |  |  | (16,711,000) |  | (14,606,000) |  | (15,618,000) |
Severance costs |  |  |  |  |  |  |  |  |  |  |  | (198,000) |  | (8,986,000) |  | (17,350,000) |
Amortization of contract cost assets |  |  |  |  |  |  |  |  |  |  |  | (476,000) |  | (3,944,000) |  | (2,876,000) |
Strategy and shareholder advisory expenses |  |  |  |  |  |  |  |  |  |  |  | (6,513,000) |  | 0 |  | 0 |
Acquisition costs |  |  |  |  |  |  |  |  |  |  |  | (4,194,000) |  | (2,116,000) |  | (10,769,000) |
Gain (loss) from discontinued operations | $ (8,700,000) | [1] | $ 0 | $ 0 | $ 1,383,000 | $ (3,166,000) | $ (1,135,000) | $ (1,508,000) | $ (265,000) |  |  | (7,317,000) | [1] | (6,074,000) | [1] | 1,613,000 | [1]
Adjusted EBITDA |  |  |  |  |  |  |  |  |  |  |  | $ 66,317,000 |  | $ 48,573,000 |  | $ (13,831,000) |
[1] | Includes $6.8 million loss on disposal of discontinued operations for the year ended December 31, 2021

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