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Business Combinations - Narrative (Details) member in Thousands, $ in Thousands |  | 1 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Jul. 01, 2020 USD ($) member | Dec. 31, 2020 USD ($) member security | Sep. 30, 2020 USD ($) | Dec. 31, 2020 USD ($) member security business_combination | Dec. 31, 2020 USD ($) business_combination member security | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Sep. 01, 2020 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Number of business combinations | business_combination |  |  |  | 3 | 3 |  |  |
Acquisition costs |  |  |  |  | $ 16,000 |  |  |
Net cash paid in business combinations |  |  |  |  | 755,000 | $ 0 | $ 0 |
Contingent consideration liabilities |  | $ 46,000 | $ 46,000 | $ 46,000 | $ 46,000 |  |  |
Business combination goodwill is deductible for income tax purposes |  | 27.00% |  |  |  |  |  |
Health Plans |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Number of members eligible for the health care programs, approximately | member |  | 200 |  | 200 | 200 |  |  |
Goodwill |  | $ 692,000 |  | $ 692,000 | $ 692,000 | 143,000 | $ 143,000 |
Magellan Complete Care |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Ownership percentage |  | 100.00% |  | 100.00% | 100.00% |  |  |
Net cash paid in business combinations |  | $ 1,037,000 |  |  |  |  |  |
Total purchase consideration paid |  |  |  |  | $ 1,008,000 |  |  |
Purchase price |  |  |  |  | 850,000 |  |  |
Preliminary closing adjustments |  |  |  |  | 158,000 |  |  |
Contingent consideration liabilities |  | $ 29,000 |  | $ 29,000 | $ 29,000 |  |  |
Number of states in which company operates (in state) | security |  | 6 |  | 6 | 6 |  |  |
Revenue of acquired business |  |  |  |  | $ 2,900,000 |  |  |
Pro forma revenue |  |  |  |  | 22,400,000 | 19,600,000 |  |
Pro forma earnings |  |  |  |  | $ 833,000 | $ 772,000 |  |
Passport Health Plan Inc |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Purchase price |  |  | 66,000 |  |  |  |  |
Preliminary closing adjustments |  |  | $ 20,000 |  |  |  |  |
Number of members eligible for the health care programs, approximately | member |  | 337 |  | 337 | 337 |  |  |
Goodwill |  |  |  |  |  |  |  | $ 30,000
Your Care Health Plan Inc |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Preliminary closing adjustments | $ 42,000 |  |  |  |  |  |  |
Number of members eligible for the health care programs, approximately | member | 47 |  |  |  |  |  |  |
Goodwill | $ 31,000 |  |  |  |  |  |  |

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