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Summary of Significant Accounting Policies - Textual (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2020 USD ($) state segment | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Finite-Lived Intangible Assets [Line Items] |  |  |
Number of states in which entity operates | state | 39 |  |
Number of reportable segments | segment | 2 |  |
Fair value of the Redeemable noncontrolling interests | $ 400.0 |  |
Minimum accrual of loss contingency needed to accrue for related legal fees | 5.0 |  |
Advertising expense | $ 4.6 | $ 6.1 | $ 6.7
Market access assets |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Finite-lived intangible asset useful life | 20 years |  |
Payor Source | Revenue from Contract with Customer Benchmark | Medicare | RAC Audits |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Percentage of Medicare patient discharges (percent) | 1.00% |  |

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