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Commitments and Contingencies - Additional Information (Detail) £ in Millions | 6 Months Ended | 12 Months Ended |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2021 USD ($) | Jun. 30, 2021 GBP (£) | Jun. 30, 2020 USD ($) | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($) | Dec. 31, 2012 USD ($) | Dec. 31, 2011 USD ($) | Jun. 30, 2021 GBP (£) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2010 USD ($)
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self-insured for professional and general liability, current | $ 74,000,000 |  |  |  |  |  |  |  |  | $ 74,000,000 |  |  |  |  |
Compensation liability claims | 109,000,000 |  |  |  |  |  |  |  |  | 105,000,000 |  |  |  |  |
Compensation and related benefits | 55,000,000 |  |  |  |  |  |  |  |  | 55,000,000 |  |  |  |  |
Department of Human Services |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Repayment of legal settlement amount on demand |  |  |  | $ 4,000,000 | $ 4,000,000 | $ 4,000,000 | $ 4,000,000 | $ 4,000,000 |  |  |  |  |  |  |
Amount claimed from over payments of legal settlements |  |  |  | 7,000,000 | 8,000,000 | 7,000,000 | 4,000,000 |  |  |  |  |  |  |  |
Amount claimed from over payments of legal settlements due to change in calculations |  |  |  | 3,000,000 | 2,000,000 | 2,000,000 |  |  |  |  |  |  |  |  |
Wind Storms |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum insurance deductible | 2,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cygnet Health Care Limited |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Property insurance | £ |  | £ 1,500 |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum | Wind Storms |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial property insurance policies covering catastrophic losses | $ 1,000,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of insurance deductible | 5.00% |  |  |  |  |  |  |  | 5.00% |  |  |  |  |  |
Maximum | Earthquake | LAS VEGAS, NEVADA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial property insurance policies covering catastrophic losses | $ 200,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum | Earthquake | CALIFORNIA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commercial property insurance policies covering catastrophic losses | 150,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 | Wind Storms |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of insurance deductible | 3.00% |  |  |  |  |  |  |  | 3.00% |  |  |  |  |  |
General And Professional Liability Insurance Policies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self-insured for professional and general liability | $ 36,000,000 |  | $ 20,000,000 |  |  |  |  |  |  |  |  |  |  |  |
General and Professional Liability |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self-insured for professional and general liability | 322,000,000 |  |  |  |  |  |  |  |  | 264,000,000 |  |  |  |  |
Subsidiaries | Professional Liability |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self-insured for professional and general liability | £ |  |  |  |  |  |  |  |  | £ 10 |  |  |  |  |  |
Purchased several excess policies through commercial insurance carriers per occurrence |  |  | 2,500,000 |  |  |  |  |  |  |  |  |  |  |  |
Purchased several excess policies through commercial insurance carriers per occurrence excess claim amount |  |  | 10,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Subsidiaries | Professional Liability | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Self-insured for professional and general liability | 20,000,000 |  | 10,000,000 |  |  |  |  |  |  |  | $ 5,000,000 | $ 5,000,000 | $ 5,000,000 | $ 10,000,000 |
Subsidiaries | General Liability |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |
Subsidiaries | General And Professional Liability Insurance Policies |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchased several excess policies through commercial insurance carriers per occurrence | $ 155,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Subsidiaries | General And Professional Liability Insurance Policies | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchased several excess policies through commercial insurance carriers per occurrence |  |  |  | $ 250,000,000 | $ 250,000,000 | $ 200,000,000 | $ 200,000,000 | $ 200,000,000 |  | $ 250,000,000 | $ 250,000,000 | $ 250,000,000 | $ 250,000,000 | $ 250,000,000 | $ 200,000,000

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