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Accounts Receivable and Net Revenue - Schedule of Net Revenue (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Disaggregation of Revenue [Abstract]        
Net revenue $ 486,033 $ 472,959 $ 968,262 $ 919,712
Net patient service revenue [Member]        
Disaggregation of Revenue [Abstract]        
Net revenue 418,507 412,950 824,542 794,012
Hospital contract administrative fees [Member]        
Disaggregation of Revenue [Abstract]        
Net revenue 65,481 58,904 129,007 115,970
Other revenue [Member]        
Disaggregation of Revenue [Abstract]        
Net revenue $ 2,045 $ 1,105 $ 14,713 $ 9,730