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Accounts Receivable and Net Revenue - Schedule of Accounts Receivable, Net (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Receivables [Abstract] |  |
Gross accounts receivable | $ 1,106,394 | $ 1,750,264
Allowance for contractual adjustments and uncollectibles | (864,463) | (1,315,998)
Accounts receivable, net | $ 241,931 | $ 434,266

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