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Accounts Receivable and Net Revenue - Schedule of Net Revenue (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Disaggregation of Revenue [Abstract]        
Net revenue $ 489,915 $ 492,949 $ 1,458,177 $ 1,412,661
Net patient service revenue [Member]        
Disaggregation of Revenue [Abstract]        
Net revenue 421,085 432,854 1,245,627 1,226,866
Hospital contract administrative fees [Member]        
Disaggregation of Revenue [Abstract]        
Net revenue 67,418 59,491 196,425 175,462
Other revenue [Member]        
Disaggregation of Revenue [Abstract]        
Net revenue $ 1,412 $ 604 $ 16,125 $ 10,333