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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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