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Accounts Receivable and Net Revenue - Schedule of Net Revenue (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disaggregation of Revenue [Abstract]                      
Net revenue $ 416,630 $ 460,635 $ 415,441 $ 441,245 $ 458,600 $ 454,913 $ 439,154 $ 427,092 $ 1,733,951 $ 1,779,759 $ 1,723,107
Net patient service revenue [Member]                      
Disaggregation of Revenue [Abstract]                      
Net revenue                 1,481,331 1,567,624 1,529,561
Hospital contract administrative fees [Member]                      
Disaggregation of Revenue [Abstract]                      
Net revenue                 218,495 197,340 181,050
Other revenue [Member]                      
Disaggregation of Revenue [Abstract]                      
Net revenue                 $ 34,125 $ 14,795 $ 12,496