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Schedule of Changes in Fair Value of Level 3 Contingent Consideration (Parenthetical) (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jul. 03, 2016 | Jul. 05, 2015 | Jul. 03, 2016 | Jul. 05, 2015
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Payments of contingent consideration |  |  | $ 11,697 |
Increase in contingent consideration | $ 1,300 |  | 2,478 | $ (1,600)
Universal Robots |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Payments of contingent consideration |  |  | $ 15,000 |
EBITDA contingent consideration amount, percentage | 100.00% |  | 100.00% |
Increase in contingent consideration | $ 800 |  | $ 1,900 |
ZTEC Instruments, Inc. |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Increase in contingent consideration |  | $ (1,600) |  | (1,600)
Avionics Interface Technologies, LLC |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Increase in contingent consideration | $ 600 |  | $ 600 |
Contingent Consideration | ZTEC Instruments, Inc. |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Increase in contingent consideration |  | $ 0 |  | $ 0

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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=35744584&loc=d3e7008-128479 + Details
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