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The CARES Act - Additional Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Apr. 24, 2020
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
CARES Act [Line Items]                  
Income from relief fund   $ 4,442 $ 7,656   $ 4,442 $ 16,206     $ 32,800
Expected repay of payroll tax deferrals       $ 39,300          
CARES Act [Member]                  
CARES Act [Line Items]                  
Offer of eligible relief amount         100,000,000        
Additional offer of eligible relief amount $ 75,000,000                
Cash benefit relating to delay of payment of social security payroll taxes         39,300        
Remaining unrecognized provider relief funds   4,500     $ 4,500   $ 9,000    
CARES Act [Member] | American Rescue Plan [Member]                  
CARES Act [Line Items]                  
Income from relief fund   $ 4,400              
CARES Act [Member] | Medicare [Member]                  
CARES Act [Line Items]                  
Repayment of advanced payments               $ 25,100  
Percentage of increase in medicare reimbursement rate                 2.00%
Percentage of reduced in medicare reimbursement rate   1.00%     1.00%        
CARES Act [Member] | Public Health and Social Services Emergency Fund [Member]                  
CARES Act [Line Items]                  
Receipt of CARES Act of 2020 aid amount                 $ 34,900
Income from relief fund             21,500 17,900  
Receipt of additional CARES Act of 2020 aid amount             7,700 $ 24,200  
CARES Act [Member] | Public Health and Social Services Emergency Fund [Member] | American Rescue Plan [Member]                  
CARES Act [Line Items]                  
Receipt of additional CARES Act of 2020 aid amount             14,200    
CARES Act [Member] | CMS' Accelerated and Advance Payment Program [Member]                  
CARES Act [Line Items]                  
Repayment of advanced payments             $ 20,100    
CARES Act [Member] | CMS' Accelerated and Advance Payment Program [Member] | Medicare [Member]                  
CARES Act [Line Items]                  
Amount of advance payment received                 $ 45,200