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Schedule of Changes in Fair Value of Level 3 Contingent Consideration (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 28, 2020 | Jun. 30, 2019 | Jun. 28, 2020 | Jun. 30, 2019
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Balance at beginning of period | $ 20,472 | $ 38,313 | $ 39,705 | $ 70,543
Foreign currency impact | 6 | 206 | (355) | (405)
Payments | 0 | 0 | (8,852) | (34,590)
Fair value adjustment | 29,259 | (11,672) | 19,239 | (8,701)
Balance at end of period | $ 49,737 | $ 26,847 | $ 49,737 | $ 26,847

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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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