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Goodwill and Intangible Assets - Intangible Assets by Major Asset Class (Detail) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016
Intangible Assets by Major Class [Line Items] |  |
Gross | $ 265,725 | $ 128,152
Accumulated amortization | 39,967 | 39,421
Net book value | 225,758 | 88,731
Trade name, trademark and trade dress and other |  |
Intangible Assets by Major Class [Line Items] |  |
Gross | 218,364 | 88,590
Net book value | 218,364 | 88,590
Patents |  |
Intangible Assets by Major Class [Line Items] |  |
Gross | 31,581 | 31,581
Accumulated amortization | 31,491 | 31,440
Net book value | $ 90 | 141
Patents | Minimum |  |
Intangible Assets by Major Class [Line Items] |  |
Useful Life (years) | 2 years |
Patents | Maximum |  |
Intangible Assets by Major Class [Line Items] |  |
Useful Life (years) | 16 years |
Developed technology and other |  |
Intangible Assets by Major Class [Line Items] |  |
Gross | $ 15,780 | 7,981
Accumulated amortization | 8,476 | 7,981
Net book value | $ 7,304 | $ 0
Developed technology and other | Minimum |  |
Intangible Assets by Major Class [Line Items] |  |
Useful Life (years) | 1 year |
Developed technology and other | Maximum |  |
Intangible Assets by Major Class [Line Items] |  |
Useful Life (years) | 9 years |

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- Definition Intangible Assets by Major Class [Line Items] + References No definition available. + Details
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- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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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 Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16212-109274 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph ((a)(1),(b)) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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