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Basis of Presentation - Additional Information (Details) $ in Millions |  | 9 Months Ended |
--- | --- | --- | ---
Jun. 30, 2023 USD ($) | Sep. 30, 2023 USD ($) hospital state | Sep. 30, 2022 USD ($) | Jul. 01, 2023 bed
Class of Stock [Line Items] |  |  |  |
Number of states in which entity operates | state |  | 37 |  |
Number of inpatient rehabilitation hospitals operated |  | 159 |  |
Number of solely owned inpatient rehabilitation hospitals |  | 96 |  |
Number of jointly owned inpatient rehabilitation hospitals |  | 63 |  |
Contributions from noncontrolling interests of consolidated affiliates | $ |  | $ 54.7 | $ 55.1 |
Hospital in Bowie, Maryland | Corporate Joint Venture |  |  |  |
Class of Stock [Line Items] |  |  |  |
Number of beds | bed |  |  |  | 60
Contributions from noncontrolling interests of consolidated affiliates | $ | $ 26.3 |  |  |
Remaining noncontrolling interest |  |  |  | 50.00%
Minimum |  |  |  |
Class of Stock [Line Items] |  |  |  |
Joint venture ownership percentage |  | 50.00% |  |
Maximum |  |  |  |
Class of Stock [Line Items] |  |  |  |
Joint venture ownership percentage |  | 97.50% |  |

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