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Revenue - Additional Information (Detail) - USD ($)
$ in Thousands
 1 Months Ended 12 Months Ended
Apr. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disaggregation of Revenue [Line Items]        
Accounts receivable, net   $ 15,340 $ (18,714) $ (19,702)
Cost report receivables   5,818 13,723  
Net adjustments to estimated cost report settlements resulted in (decreases) increases to revenue   (1,300) (400) 500
Costs of providing charity care services   4,400 4,300 $ 4,700
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 description In April 2020, the Company received approximately $45 million from CMS’ Accelerated and Advance Payment Program for Medicare providers, which the Company expects to repay over the 12 month period beginning in April 2021. Once repayment begins, the amount will be recouped from the provider’s or supplier’s new Medicare claims.      
Expected repayment period 12 months      
Repayment of advanced payments period 2021-04      
CARES Act [Member] | CMS’ Accelerated and Advance Payment Program [Member] | Medicare [Member] | Other Accrued Liabilities [Member]        
Disaggregation of Revenue [Line Items]        
Contract liabilities   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   $ 62,100 $ 45,900