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Accounts Receivable and Net Revenue - Schedule of Accounts Receivable, Net (Detail) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Receivables [Abstract]    
Gross accounts receivable $ 1,215,086 $ 1,106,394
Allowance for contractual adjustments and uncollectibles (953,114) (864,463)
Accounts receivable, net $ 261,972 $ 241,931