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Fair value measurement - Additional Information (Detail) - USD ($) $ in Thousands	Jun. 26, 2016	Dec. 31, 2015
Fair Value Measurements [Line Items]
Fair value measurement with unobservable inputs reconciliations liability value	$ 21,938	$ 20,829
Current portion of contingent consideration	7,453	$ 7,291
Fair value measurement with unobservable inputs reconciliations other liabilities	14,400
Minimum
Fair Value Measurements [Line Items]
Fair value of contingent consideration liability associated with future milestone	7,000
Maximum
Fair Value Measurements [Line Items]
Fair value of contingent consideration liability associated with future milestone	$ 46,400

X

- Definition

Current portion of contingent consideration.

+ References

No definition available.

+ Details

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X

- Definition

Estimated fair value of contingent consideration in event company achieves specified milestones.

+ References

No definition available.

+ Details

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X

- Definition

Fair value measurement with unobservable inputs reconciliation contingent liability in acquisition noncurrent.

+ References

No definition available.

+ Details

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X

- Definition

Fair value measurements.

+ References

No definition available.

+ Details

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X

- 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=36462937&loc=d3e19207-110258

+ Details

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