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Accounts Receivable, Net - Schedule of Accounts Receivables Net (Detail) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Accounts Receivable Net Current [Abstract]
Trade accounts receivable	$ 176,375	$ 159,992
Unbilled revenue, at net realizable value	60,035	60,684
Total accounts receivable	236,410	220,676
Allowance for doubtful accounts	(14,379)	(13,389)	$ (13,827)	$ (13,508)
Accounts receivable, net	$ 222,031	$ 207,287

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Amount, before allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business, classified as current.

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