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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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