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Description of Business - Additional Information (Details) |  |  |  |  |  |  | 12 Months Ended |  |
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Apr. 30, 2020 USD ($) | Sep. 11, 2019 USD ($) shares | Sep. 10, 2019 USD ($) | Aug. 30, 2019 USD ($) | May 31, 2019 USD ($) | Jul. 01, 1999 | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2020 enrollee | Dec. 31, 2020 primary_care_physician | Dec. 31, 2020 specialty_care_physician | Dec. 31, 2020 plan | Dec. 31, 2020 clinic | Dec. 31, 2020 company | Dec. 31, 2020 medical_center | Dec. 31, 2020 member | Sep. 30, 2019 USD ($)
Description Of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions of preferred returns |  |  |  |  |  |  |  | $ 1,990,000 | $ 1,975,000 |  |  |  |  |  |  |  |  |
Stock issued during period new issues |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |
Cash paid |  |  |  |  |  |  | $ 11,354,000 | 49,403,000 | 0 |  |  |  |  |  |  |  |  |
Proceeds from sale of equity method investment |  |  |  |  |  |  | 52,743,000 | $ 0 | $ 0 |  |  |  |  |  |  |  |  |
Accountable Health Care IPA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration transferred |  |  |  | $ 25,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
AMG |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration transferred |  |  | $ 1,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Universal Care, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of equity method investment | $ 52,743,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beneficial interest in UCI | $ 15,723,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dr. Jay | Accountable Health Care IPA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest acquired |  |  |  | 75.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration transferred |  |  |  | $ 7,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Affiliated Entity | AP-AMH |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount of loan |  | $ 545,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 545,000,000.0
Term of receivable |  | 10 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stated rate of note of loan receivable |  | 10.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate in the event of default |  | 10.75% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Affiliated Entity | APC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares purchased by related party (in shares) | shares |  | 15,015,015 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock issued during period new issues |  | $ 300,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proxy votes |  | 9.99% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
APC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Initial fixed term of amended and restated management and administrative services agreement |  |  |  |  |  | 30 years |  |  |  |  |  |  |  |  |  |  |  |
APC | MPP, AMG Properties, and ZLL Asset Acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Asset acquisition, purchase price |  |  |  |  |  |  | $ 12,200,000 |  |  |  |  |  |  |  |  |  |  |
Asset acquisition, percentage of shares acquired |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |
Asset acquisition, number of companies acquired | company |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 |  |  |
APC | Accountable Health Care IPA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest acquired |  |  |  | 25.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
APC | AMG |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest acquired |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire business |  |  | $ 1,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Value of shares transferred in acquisition |  |  | $ 400,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
APC | Universal Care Acquisition Partners, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |
APC | MPP, AMG Properties, and ZLL Asset Acquisition |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |
APC | ApolloMed |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment, ownership interest |  |  |  |  |  |  | 22.58% | 32.50% |  |  |  |  |  |  |  |  |  |
APC | Concourse Diagnostic Surgery Center, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment, ownership interest |  |  |  |  |  |  | 45.01% |  |  |  |  |  |  |  |  |  |  |
APC | Universal Care, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest disposed | 48.90% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of equity method investment | $ 69,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayment of indebtedness received | 16,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beneficial interest in UCI | 15,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
APC | Bright | Preferred stock | Universal Care, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred shares received from sale of equity method investment | $ 36,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
APC | Affiliated Entity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions of preferred returns |  |  |  |  |  |  | $ 5,000,000.0 |  |  |  |  |  |  |  |  |  |  |
APC | Affiliated Entity | AP-AMH |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Distributions of preferred returns |  |  |  |  |  |  | $ 30,400,000 | $ 8,900,000 |  |  |  |  |  |  |  |  |  |
APC | Affiliated Entity | AP-AMH | Series A Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares purchased by related party (in shares) | shares |  | 1,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
APC LSMA | Alpha Care |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash paid |  |  |  |  | $ 45,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |
APC LSMA | Accountable Health Care IPA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest acquired |  |  |  | 75.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |
APC LSMA | AMG |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest acquired |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payments to acquire business |  |  | $ 1,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
APC LSMA | Maverick Medical Group, Inc |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Ownership interest |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |
APC LSMA | Dr. Jay | Accountable Health Care IPA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consideration transferred |  |  |  | $ 7,300,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accountable Health Care IPA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of employees (more than) |  |  |  |  |  |  |  |  |  |  | 336 | 559 |  |  |  |  |  |
Number of medical centers | medical_center |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1 |  |
Number of members of federally qualified health plans (more than) | member |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 73,000 |
Number federally qualified health plans | plan |  |  |  |  |  |  |  |  |  |  |  |  | 3 |  |  |  |  |
AMG |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of family practice clinics | clinic |  |  |  |  |  |  |  |  |  |  |  |  |  | 3 |  |  |  |
Alpha Care |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of healthcare enrollees | enrollee |  |  |  |  |  |  |  |  |  | 180,000 |  |  |  |  |  |  |  |

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