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Goodwill and Intangible Assets - Intangible Assets (Detail) - USD ($) |  | 12 Months Ended
--- | --- | ---
Apr. 29, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Intangible assets, Gross |  | $ 565,698,000 | $ 573,353,000 |
Impairment Charges |  | (1,511,000) | 0 | $ 0
Accumulated Amortization |  | (199,619,000) | (160,813,000) |
Foreign Currency Translation |  | 1,830,000 | (4,536,000) |
Intangible assets, net |  | 366,398,000 | 408,004,000 |
Acquired intangible assets | $ 404,506,000 |  |  |
Newport [Member] |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Acquired intangible assets |  |  | 404,506,000 |
Completed Technology [Member] |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Intangible assets, Gross |  | 172,431,000 | 176,586,000 |
Impairment Charges |  | (105,000) |  |
Accumulated Amortization |  | (115,371,000) | (97,707,000) |
Foreign Currency Translation |  | 333,000 | (1,068,000) |
Intangible assets, net |  | 57,288,000 | 77,811,000 |
Completed Technology [Member] | Newport [Member] |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Acquired intangible assets |  |  | 75,386,000 |
Customer Relationships [Member] |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Intangible assets, Gross |  | 282,744,000 | 285,044,000 |
Impairment Charges |  | (1,406,000) |  |
Accumulated Amortization |  | (45,518,000) | (29,709,000) |
Foreign Currency Translation |  | 1,571,000 | (3,404,000) |
Intangible assets, net |  | 237,391,000 | 251,931,000 |
Customer Relationships [Member] | Newport [Member] |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Acquired intangible assets | $ 247,793,000 |  | 247,793,000 |
Patents, Trademarks, Trade Names and Other [Member] |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Intangible assets, Gross |  | 110,523,000 | 111,723,000 |
Accumulated Amortization |  | (38,730,000) | (33,397,000) |
Foreign Currency Translation |  | (74,000) | (64,000) |
Intangible assets, net |  | $ 71,719,000 | 78,262,000 |
Patents, Trademarks, Trade Names and Other [Member] | Newport [Member] |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Acquired intangible assets |  |  | $ 81,327,000 |

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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Amount of foreign currency translation gain (loss) which increases (decreases) assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References No definition available. + Details
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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