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Goodwill and Intangible Assets - Intangible Assets (Parenthetical) (Detail) - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Apr. 29, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Amortization of intangible assets |  | $ 45,743 | $ 35,681 | $ 6,764
Acquired intangible assets | $ 404,506 |  |  |
Completed Technology [Member] | Data Analytics Solutions Business [Member] |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Amortization of intangible assets |  | 4,155 |  |
Customer Relationships [Member] | Data Analytics Solutions Business [Member] |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Amortization of intangible assets |  | 2,300 |  |
Patents, Trademarks, Trade Names and Other [Member] | Data Analytics Solutions Business [Member] |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Amortization of intangible assets |  | $ 1,200 |  |
Newport [Member] |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Acquired intangible assets |  |  | 404,506 |
Unfavorable lease commitments |  |  | 4,302 |
Newport [Member] | Completed Technology [Member] |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Acquired intangible assets |  |  | 75,386 |
Newport [Member] | Customer Relationships [Member] |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Acquired intangible assets | $ 247,793 |  | 247,793 |
Newport [Member] | Patents, Trademarks, Trade Names and Other [Member] |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Acquired intangible assets |  |  | $ 81,327 |

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