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Summary of Significant Accounting Policies - Additional Information (Details) $ in Millions |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jul. 01, 2024 USD ($) bed | Mar. 31, 2023 USD ($) | Dec. 31, 2024 USD ($) hospital state | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Number of states in which entity operates | state |  |  | 38 |  |
Number of inpatient rehabilitation hospitals | hospital |  |  | 166 |  |
Number of inpatient rehabilitation hospitals, sole ownership | hospital |  |  | 101 |  |
Number of jointly owned inpatient rehabilitation hospitals | hospital |  |  | 65 |  |
Contributions from noncontrolling interests of consolidated affiliates |  |  | $ 140.4 | $ 68.3 | $ 64.1
Minimum accrual of loss contingency needed to accrue for related legal fees |  |  | 5.0 |  |
Advertising expense |  |  | 5.8 | 6.1 | $ 6.3
Hospital in Augusta, Georgia | Corporate Joint Venture |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Number of beds | bed | 70 |  |  |  |
Contributions from noncontrolling interests of consolidated affiliates | $ 90.0 |  |  |  |
Remaining noncontrolling interest | 50.00% |  |  |  |
Post-tax gain increasing capital in excess of par |  |  | $ 23.2 |  |
Market access assets |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Finite-lived intangible asset useful life |  |  | 20 years |  |
ALJ, Adverse Ruling |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Amount of claims pending review |  |  | $ 4.0 |  |
DAB, Adverse Ruling |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Amount of claims pending review |  |  | 30.0 |  |
Appealed claims denied |  |  | 7.0 |  |
Pending appeals additional reserve |  |  |  | $ 21.9 |
UPICs Audits |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Alleged overpayment amount |  |  | $ 18.0 |  |
SMRC |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Review of claims initiated amount |  | $ 21.0 |  |  |
Approved claims (in percent) |  |  | 0.89 |  |
Claims under appeal amount |  |  | $ 0.1 |  |
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% |  |
Maximum |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Joint venture ownership percentage |  |  | 97.50% |  |

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