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Accounts Receivable, Net (Tables) | 3 Months Ended
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Mar. 31, 2019
Receivables [Abstract] |
Summary of Accounts Receivable, Net | Accounts receivable, net consisted of the following as of December 31, 2018 and March 31, 2019 (in thousands):
|  | December 31, 2018 |  |  | March 31, 2019 |
Billed |  | $ | 538,808 |  |  | $ | 534,288 |
Unbilled |  |  | 135,180 |  |  |  | 164,034 |
Total accounts receivable, gross |  |  | 673,988 |  |  |  | 698,322 |
Allowance for doubtful accounts |  |  | (50,702 | ) |  |  | (46,398 | )
Total accounts receivable, net |  | $ | 623,286 |  |  | $ | 651,924 |

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- Definition Tabular disclosure of the various types of trade accounts and notes receivable and for each the gross carrying value, allowance, and net carrying value as of the balance sheet date. Presentation is categorized by current, noncurrent and unclassified receivables. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3,4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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