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Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended | 21 Months Ended
--- | --- | --- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2017
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |
(Provision for) benefit from income taxes |  | $ 2,172 | $ 850 | $ (18,472) | $ 5,256 |  |  |
Effective income tax benefit rate |  | (8.80%) | 15.50% | 26.80% | 23.10% |  |  |
Increase (decrease) in gross unrecognized tax benefits |  | $ 1,100 |  | $ 3,500 |  |  |  |
Cumulative effect adjustment related to unrecognized excess tax benefits on share based compensation |  | 58,700 |  | 58,700 |  |  |  | $ 58,700
U.S. statutory federal income tax rate, percent |  |  |  |  |  |  |  | 35.00%
Additional income tax expense |  | $ 12,200 |  | $ 12,200 |  |  |  |
Scenario Forecast [Member] |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |
U.S. statutory federal income tax rate, percent | 21.00% |  |  |  |  | 21.00% |  |
U.S. statutory federal income tax rate, percent |  |  |  |  |  |  | 31.60% |

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