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Acquisitions and Dispositions - Allocation of Acquired Intangible Assets and Liabilities Related Estimates of Useful Lives (Detail) - USD ($) $ in Thousands |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Apr. 29, 2016 | Mar. 17, 2015 | Mar. 17, 2015 | Dec. 31, 2017 | Dec. 31, 2016
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Acquired intangible assets, purchase price | $ 404,506 |  |  |  |
Minimum [Member] |  |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Estimated useful life of finite-lived intangible assets |  |  |  | 1 year |
Maximum [Member] |  |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Estimated useful life of finite-lived intangible assets |  |  |  | 18 years |
Newport [Member] |  |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Acquired intangible assets, purchase price |  |  |  |  | $ 404,506
Precisive, LLC [Member] |  |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Acquired intangible assets, purchase price |  | $ 5,110 |  |  |
Order Backlog [Member] | Newport [Member] |  |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Acquired intangible assets, purchase price | $ 12,100 |  |  |  |
Estimated useful life of finite-lived intangible assets | 1 year |  |  |  |
Order Backlog [Member] | Precisive, LLC [Member] |  |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Acquired intangible assets, purchase price |  | 50 |  |  |
Estimated useful life of finite-lived intangible assets |  |  | 18 months |  |
Customer Relationships [Member] | Newport [Member] |  |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Acquired intangible assets, purchase price | $ 247,793 |  |  |  | $ 247,793
Customer Relationships [Member] | Newport [Member] | Minimum [Member] |  |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Estimated useful life of finite-lived intangible assets | 6 years |  |  |  |
Customer Relationships [Member] | Newport [Member] | Maximum [Member] |  |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Estimated useful life of finite-lived intangible assets | 18 years |  |  |  |
Customer Relationships [Member] | Precisive, LLC [Member] |  |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Acquired intangible assets, purchase price |  | 1,430 |  |  |
Estimated useful life of finite-lived intangible assets |  |  | 8 years |  |
Trademarks and Trade Names [Member] | Newport [Member] |  |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Acquired intangible assets, purchase price | $ 55,900 |  |  |  |
Estimated useful life of finite-lived intangible assets | Indefinite |  |  |  |
Developed Technology [Member] | Newport [Member] |  |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Acquired intangible assets, purchase price | $ 75,386 |  |  |  |
Developed Technology [Member] | Newport [Member] | Minimum [Member] |  |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Estimated useful life of finite-lived intangible assets | 4 years |  |  |  |
Developed Technology [Member] | Newport [Member] | Maximum [Member] |  |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Estimated useful life of finite-lived intangible assets | 8 years |  |  |  |
Developed Technology [Member] | Precisive, LLC [Member] |  |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Acquired intangible assets, purchase price |  | 820 |  |  |
Estimated useful life of finite-lived intangible assets |  |  | 10 years |  |
In-process Research and Development [Member] | Newport [Member] |  |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Acquired intangible assets, purchase price | $ 6,899 |  |  |  |
Estimated useful life of finite-lived intangible assets | Undefined |  |  |  |
Leasehold Interest Favorable [Member] | Newport [Member] |  |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Acquired intangible assets, purchase price | $ 6,428 |  |  |  |
Leasehold Interest Favorable [Member] | Newport [Member] | Minimum [Member] |  |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Estimated useful life of finite-lived intangible assets | 4 years |  |  |  |
Leasehold Interest Favorable [Member] | Newport [Member] | Maximum [Member] |  |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Estimated useful life of finite-lived intangible assets | 5 years |  |  |  |
Leasehold Interest Unfavorable [Member] | Newport [Member] |  |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Acquired intangible assets, purchase price | $ 4,302 |  |  |  |
Exclusive Patent License [Member] | Precisive, LLC [Member] |  |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Acquired intangible assets, purchase price |  | 2,600 |  |  |
Estimated useful life of finite-lived intangible assets |  |  | 10 years |  |
Trade names [Member] | Precisive, LLC [Member] |  |  |  |  |
Acquired Finite-Lived Intangible Assets [Line Items] |  |  |  |  |
Acquired intangible assets, purchase price |  | $ 210 |  |  |
Estimated useful life of finite-lived intangible assets |  |  | 10 years |  |

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