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Fair value measurement - additional information (Detail) (USD $) |  |  |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | --- | ---
Sep. 28, 2014 | Dec. 31, 2013 | Sep. 28, 2014 Minimum | Sep. 28, 2014 Maximum | Sep. 28, 2014 Regulatory and Sales Milestones | Sep. 29, 2013 Regulatory and Sales Milestones | Sep. 28, 2014 Regulatory and Sales Milestones | Sep. 29, 2013 Regulatory and Sales Milestones
Fair Value Measurements [Line Items] |  |  |  |  |  |  |  |
Reversal of contingent consideration liabilities |  |  |  |  | $ 1,500,000 | $ 4,400,000 | $ 8,200,000 | $ 12,400,000
Fair value of contingent consideration liability associated with future milestone |  |  | 0 | 56,500,000 |  |  |  |
Fair value measurement with unobservable inputs reconciliations liability value | 12,643,000 | 20,313,000 |  |  |  |  |  |
Current Portion Of Contingent Consideration | 2,957,000 | 4,131,000 |  |  |  |  |  |
Other liabilities | $ 9,600,000 |  |  |  |  |  |  |

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- Definition Current portion of contingent consideration. + References No definition available. + Details
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- Definition Estimated fair value of contingent consideration in event company achieves specified milestones. + References No definition available. + Details
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- Details
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- Definition Fair value measurement with unobservable inputs reconciliation contingent liability in acquisition noncurrent. + References No definition available. + Details
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- Definition Amount of increase (decrease) in the value of a contingent consideration liability, including, but not limited to, differences arising upon settlement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 4 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=7488404&loc=d3e7008-128479 + Details
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- Definition Fair value of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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