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Accounts Receivable and Net Revenue - Schedule of Accounts Receivable, Net (Detail) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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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

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