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Summary of Significant Accounting Policies - Additional Information (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Jan. 01, 2018 | Dec. 31, 2017
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Summary Of Significant Accounting Policies [Line Items] |  |  |
Performance obligations remaining to be performed | $ 915,000 |  |
Accumulated deficit | (115,521) |  | $ (120,402)
Accounts receivable and unbilled, net | 110,654 |  | 83,079
Deferred income taxes | 9,970 |  | 6,343
Accrued expenses | 63,576 |  | 23,673
Pre-funded study costs | 0 |  | 57,406
Advanced billings | 126,387 |  | $ 73,756
ASC 606 |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Accounts receivable and unbilled, net |  | $ 92,832 |
Advanced billings |  | 119,451 |
ASC 606 | Impact of Adoption of ASC 606 - Adjustments |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |
Accumulated deficit | 11,423 | (9,700) |
Accounts receivable and unbilled, net | (12,733) | 9,753 |
Deferred income taxes | (3,347) | 3,300 |
Accrued expenses | (45,145) | 34,500 |
Pre-funded study costs | 57,487 | (57,406) |
Advanced billings | $ (40,356) | $ 45,695 |

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