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Schedule of Changes in Fair Value of Level 3 Contingent Consideration (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 27, 2020 | Sep. 29, 2019 | Sep. 27, 2020 | Sep. 29, 2019
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Balance at beginning of period | $ 49,737 | $ 26,847 | $ 39,705 | $ 70,543
Fair value adjustment | (27,206) | (7,759) | (7,967) | (16,460)
Foreign currency impact | 0 | 0 | (8,852) | (34,590)
Payments | 0 | (1,008) | (355) | (1,413)
Balance at end of period | $ 22,531 | $ 18,080 | $ 22,531 | $ 18,080

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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 Amount of gain (loss) recognized in income from liability measured at fair value on recurring basis using unobservable input (level 3). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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