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Revenue - Additional Information (Detail) - USD ($)
$ in Thousands
 1 Months Ended 3 Months Ended 12 Months Ended
Apr. 30, 2020
Sep. 30, 2021
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disaggregation of Revenue [Line Items]          
Accounts receivable, net     $ 2,448 $ 15,340 $ (18,714)
Cost report payable     6,487    
Cost report receivables       5,818  
Net adjustments to estimated cost report settlements resulted in (decreases) increases to revenue     (5,400) (1,300) 400
Costs of providing charity care services     3,800 4,400 $ 4,300
CARES Act [Member] | Medicare [Member]          
Disaggregation of Revenue [Line Items]          
Repayment of advanced payments   $ 25,000      
Repayment of advanced payments period 2022        
CARES Act [Member] | CMS' Accelerated and Advance Payment Program [Member] | Medicare [Member]          
Disaggregation of Revenue [Line Items]          
Amount of advance payment received $ 45,000        
Repayment of advanced payments     25,000    
Repayment of advanced payments description In April 2020, the Company received approximately $45 million from CMS’ Accelerated and Advance Payment Program for Medicare providers. The Company repaid approximately $25 million of the $45 million of advance payments during 2021 via recoupment from the Company’s new Medicare claims and will continue to repay the remaining balance throughout 2022.        
Repayment of advanced payments period 2022        
CARES Act [Member] | CMS' Accelerated and Advance Payment Program [Member] | Medicare [Member] | Other Accrued Liabilities [Member]          
Disaggregation of Revenue [Line Items]          
Contract liabilities     30,400 35,900  
CARES Act [Member] | CMS' Accelerated and Advance Payment Program [Member] | Medicare [Member] | Other Liabilities [Member]          
Disaggregation of Revenue [Line Items]          
Contract liabilities       11,300  
Accounting Standards Update 2014-09          
Disaggregation of Revenue [Line Items]          
Accounts receivable, net     $ 49,700 $ 62,100