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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