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Accounts Receivable, Net of Allowance for Credit Losses - Narrative (Detail) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2020 | Dec. 31, 2020 | Sep. 30, 2021 | Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Gross accounts receivable |  | $ 908,727 | $ 980,698 |
Allowance for credit losses |  | 27,707 | 29,527 | $ 29,969
Accounts receivable, after allowance for credit loss, current |  | 881,020 | 951,171 |
Deferred billings |  | 28,491 | 14,532 |
Allowances for credit losses |  | 3,134 | 2,593 |
Net deferred billings |  | 25,357 | $ 11,939 |
Allowance for credit losses current period charge | $ 541 | 2,400 |  |
ASC 326 |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Transition period adjustment on accounts receivables (through retained earnings) pursuant to ASC 326 |  | $ (734) |  |

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