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Schedule of Changes in Fair Value of Level 3 Contingent Consideration (Parenthetical) (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Oct. 02, 2016 | Oct. 04, 2015 | Oct. 02, 2016 | Oct. 04, 2015 | Jun. 11, 2015
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |
Payments of contingent consideration |  |  | $ 11,697 |  |
Increase(decrease)in contingent consideration | $ 8,000 |  | 10,451 | $ (2,600) |
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(decrease)in contingent consideration | $ 8,000 |  | $ 9,900 |  |
Contingent consideration |  |  |  |  | $ 31,600
Avionics Interface Technologies, LLC |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |
Increase(decrease)in contingent consideration |  | $ (1,000) | $ 600 | (1,000) |
ZTEC Instruments, Inc. |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |
Increase(decrease)in contingent consideration |  |  |  | (1,600) |
Contingent consideration |  | $ 0 |  | $ 0 |

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