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Summary of Significant Accounting Policies - Textual (Details) $ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2022 USD ($) hospital state | Oct. 31, 2022 USD ($) | Dec. 31, 2017 USD ($) claim | Dec. 31, 2022 USD ($) hospital state | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Number of states in which entity operates | state | 36 |  |  | 36 |  |  |
Number of inpatient rehabilitation hospitals | hospital | 153 |  |  | 153 |  |  |
Number of inpatient rehabilitation hospitals, sole ownership | hospital | 95 |  |  | 95 |  |  |
Number of jointly owned inpatient rehabilitation hospitals | hospital | 58 |  |  | 58 |  |  |
Redeemable noncontrolling interest, fair value determination based on home health acquisitions, value threshold | $ 400.0 |  |  | $ 400.0 |  |  |
Minimum accrual of loss contingency needed to accrue for related legal fees | 5.0 |  |  | 5.0 |  |  |
Advertising expense |  |  |  | $ 6.3 | $ 5.6 | $ 4.6 |
Market access assets |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Finite-lived intangible asset useful life |  |  |  | 20 years |  |  |
DAB, Adverse Ruling |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Amount of claims pending review | 52.0 |  |  | $ 52.0 |  |  |
Appealed claims denied | 6.0 |  |  | $ 6.0 |  |  |
UPICs Audits |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Number of claims sampled | claim |  |  | 100 |  |  |  |
Paid claims, amount from sample |  |  | $ 1.3 |  |  |  |
Extrapolated error rate period |  |  | 4 years |  |  |  |
Alleged overpayment amount | 18.0 |  | $ 33.9 |  |  |  | $ 30.5
Amount overturned of overpayment determination |  | $ 12.5 |  |  |  |  |
Amount overturned of overpayment determination, interest | $ 3.2 |  |  |  |  |  |
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% |  |  |
Minimum |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Joint venture ownership percentage | 50.00% |  |  | 50.00% |  |  |
Maximum |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Joint venture ownership percentage | 97.50% |  |  | 97.50% |  |  |

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