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Commitments and Contingencies - Additional Information (Detail) £ in Millions |  | 3 Months Ended | 12 Months Ended |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 28, 2024 USD ($) | Mar. 31, 2024 USD ($) | Mar. 31, 2024 GBP (£) | Sep. 30, 2023 USD ($) | Jun. 30, 2023 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($) | Mar. 31, 2024 GBP (£) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchased several excess policies through commercial insurance carriers per occurrence excess claim amount |  | $ 20,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self-insured for professional and general liability, current |  | 70,000,000 |  |  |  | $ 70,000,000 |  |  |  |  |  |  |  |  |  |  |
Compensation liability claims |  | 132,000,000 |  |  |  | 130,000,000 |  |  |  |  |  |  |  |  |  |  |
Pre-tax decrease to reserves for self-insured workers' compensation liability claims |  |  |  |  | $ 10,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Compensation and related benefits |  | 55,000,000 |  |  |  | 55,000,000 |  |  |  |  |  |  |  |  |  |  |
Maximum insurance deductible |  | 5,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self insurance reserve amount exhausted |  | 20,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchased several excess policies through commercial insurance amount exhausted |  | 20,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
District Facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Projected aggregate development and construction cost |  | 439,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Development and construction cost incurred |  | $ 229,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lease initial terms |  | 75 years |  |  |  |  |  |  |  |  | 75 years |  |  |  |  |  |
Committment to expend |  | $ 5,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Projected commitment expend period |  | 12 years | 12 years |  |  |  |  |  |  |  |  |  |  |  |  |  |
Department of Human Services |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayment of legal settlement amount on demand |  | $ 4,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount claimed from over payments of legal settlements |  |  |  |  |  |  | $ 4,000,000 | $ 7,000,000 | $ 8,000,000 | $ 7,000,000 |  |  |  |  |  |  |
Amount claimed from over payments of legal settlements due to change in calculations |  |  |  |  |  |  |  | $ 3,000,000 | 2,000,000 | $ 2,000,000 |  |  |  |  |  |  |
The Pavilion Behavioral Health System |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate insurance coverage |  | 221,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
The Pavilion Behavioral Health System | Compensatory Damages |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Damages awarded | $ 60,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
The Pavilion Behavioral Health System | Punitive Damages |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Damages awarded | $ 475,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Wind Storms |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial property insurance policies covering catastrophic losses |  | 250,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Earthquake Wind Hail and Flood |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum insurance deductible |  | 5,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
All Other Events |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum insurance deductible |  | 5,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cygnet Health Care Limited |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property insurance | £ |  |  | £ 1,500 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self-insured for professional and general liability |  | 20,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchased several excess policies through commercial insurance carriers per occurrence |  | 25,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial property insurance policies covering catastrophic losses |  | $ 1,000,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lease initial terms |  | 10 years |  |  |  |  |  |  |  |  | 10 years |  |  |  |  |  |
Maximum | Wind Storms |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of insurance deductible |  | 5.00% |  |  |  |  |  |  |  |  | 5.00% |  |  |  |  |  |
Maximum | Earthquake | CALIFORNIA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial property insurance policies covering catastrophic losses |  | $ 100,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum | Earthquake | Faulty Zones of UNITED STATES |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial property insurance policies covering catastrophic losses |  | 100,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum | Earthquake | PUERTO RICO |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial property insurance policies covering catastrophic losses |  | 40,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum | Earthquake | OTHER STATES |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial property insurance policies covering catastrophic losses |  | 250,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum | Flood |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial property insurance policies covering catastrophic losses |  | 100,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum | Flood | PUERTO RICO |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial property insurance policies covering catastrophic losses |  | 1,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum | Flood | Texas |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial property insurance policies covering catastrophic losses |  | $ 10,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Lease initial terms |  | 5 years |  |  |  |  |  |  |  |  | 5 years |  |  |  |  |  |
Loss on business interruption insurance recovery |  | $ 25,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum | District Facilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Committment to expend |  | $ 75,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum | Wind Storms |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of insurance deductible |  | 3.00% |  |  |  |  |  |  |  |  | 3.00% |  |  |  |  |  |
Professional Liability | The Pavilion Behavioral Health System |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self-insured retention amounts |  | $ 10,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
General Liability | The Pavilion Behavioral Health System |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self-insured retention amounts |  | 3,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
General And Professional Liability Insurance Policies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self-insured for professional and general liability |  | 7,000,000 |  | $ 5,000,000 | $ 20,000,000 | 25,000,000 | 16,000,000 |  |  |  |  |  |  |  |  |  |
General and Professional Liability |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self-insured for professional and general liability |  | 447,000,000 |  |  |  | 431,000,000 |  |  |  |  |  |  |  |  |  |  |
Subsidiaries | Professional Liability | Cygnet Health Care Limited |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self-insured for professional and general liability | £ |  |  |  |  |  |  |  |  |  |  | £ 16 |  |  |  |  |  |
Subsidiaries | Professional Liability | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self-insured for professional and general liability |  | 20,000,000 |  |  |  | 20,000,000 | 20,000,000 |  |  |  |  | $ 20,000,000 | $ 10,000,000 | $ 5,000,000 | $ 5,000,000 | $ 5,000,000 | $ 10,000,000
Subsidiaries | General Liability | Cygnet Health Care Limited |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self-insured for professional and general liability | £ |  |  |  |  |  |  |  |  |  |  | £ 25 |  |  |  |  |  |
Subsidiaries | General Liability | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self-insured for professional and general liability |  | 3,000,000 |  |  |  | 3,000,000 | 3,000,000 |  |  |  |  | 3,000,000 | $ 3,000,000 | $ 3,000,000 | $ 3,000,000 | $ 3,000,000 | $ 3,000,000
Subsidiaries | General And Professional Liability Insurance Policies | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchased several excess policies through commercial insurance carriers per occurrence |  | $ 175,000,000 |  |  |  | $ 165,000,000 | $ 162,000,000 |  | $ 250,000,000 |  |  | $ 155,000,000 |  |  |  |  |

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