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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Aug. 31, 2025 | Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Significant Accounting Policies [Line Items] |  |  |  |
Maximum professional liability aggregate policy limit |  | $ 75,000,000 |  |
Unfavorable adjustment for professional and general liability claims |  | 52,700,000 | $ 10,100,000 |
Professional and general liability reserve |  | 181,800,000 | 87,500,000 |
Professional and general liability reserve current |  | 31,400,000 | 12,500,000 |
Professional and general liability reserve noncurrent |  | 150,400,000 | 75,000,000 |
Insurance receivable |  | 28,800,000 | 9,300,000 |
Insurance receivable - current portion |  | 7,211,000 | 452,000 |
Insurance receivable noncurrent |  | 21,600,000 | 8,800,000 |
Workers compensation insurance claims deductible per accident |  | 500,000 |  |
Reserve for workers compensation liability |  | 34,300,000 | 30,700,000 |
Accrued salaries and benefits |  | 18,500,000 | 12,000,000.0 |
Other long-term liabilities |  | 15,800,000 | 18,700,000 |
Depreciation expense |  | 189,200,000 | 149,600,000 | $ 132,300,000
Loss on Impairment [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Non-cash property impairment charge relating to closure of facilities |  | 10,400,000 | 12,400,000 |
Non-cash operating lease right-of-use asset impairment charge related to closure of facilities |  | $ 1,000,000 | $ 1,400,000 |
ASU 2023-07 [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Change in accounting principle, accounting standards update, adopted [true false] |  | true |  |
Change in accounting principle, accounting standards update, adoption date |  | Dec. 31, 2024 |  |
Change in accounting principle, accounting standards update, immaterial effect [true false] |  | true |  |
ASU 2023-05 [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Change in accounting principle, accounting standards update, adopted [true false] |  | true |  |
Change in accounting principle, accounting standards update, adoption date |  | Jan. 01, 2025 |  |
Change in accounting principle, accounting standards update, immaterial effect [true false] |  | true |  |
ASU 2023-09 [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Change in accounting principle, accounting standards update, adopted [true false] |  | true |  |
Change in accounting principle, accounting standards update, adoption date |  | Dec. 31, 2025 |  |
Change in Accounting Principle, Accounting Standards Update, Early Adoption [true false] |  | true |  |
Maximum [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Maximum self insured professional liability limit per claim | $ 10,000,000 |  |  |
Maximum professional liability retention limit | 25,000,000 | $ 25,000,000 |  |
Maximum professional liability aggregate policy limit | 80,000,000 |  |  |
Maximum [Member] | Building and Improvements [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Property plant and equipment estimated useful life |  | 50 years |  |
Maximum [Member] | Equipment [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Property plant and equipment estimated useful life |  | 7 years |  |
Minimum [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Maximum professional liability retention limit | 15,000,000 | $ 15,000,000 |  |
Maximum professional liability aggregate policy limit | $ 75,000,000 |  |  |
Minimum [Member] | Building and Improvements [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Property plant and equipment estimated useful life |  | 10 years |  |
Minimum [Member] | Equipment [Member] |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Property plant and equipment estimated useful life |  | 3 years |  |

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