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Goodwill and other intangible assets, net - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2018 | Oct. 01, 2017
Finite-Lived Intangible Assets [Line Items] |  |  |
Impairment of long-lived assets |  | $ 19,110 | $ 0
Intellectual property |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Impairment of long-lived assets | $ 16,900 |  |
Impairment of long-lived assets, net of tax | $ 8,900 |  |

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- Definition Impairment of Intangible Assets, Finite-lived, Net Of Tax + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of a finite-lived intangible asset to fair value. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16373-109275 + Details
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- Details
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