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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. 04, 2015 | Sep. 28, 2014 | Oct. 04, 2015 | Sep. 28, 2014 | Dec. 31, 2014 | Oct. 31, 2014
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |
Business combination, contingent consideration reduced amount |  |  | $ (2,600) | $ (630) |  |
Contingent consideration | $ 14,447 |  | 14,447 |  | $ 895 |
Avionics Interface Technologies, LLC |  |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |
Business combination, contingent consideration reduced amount | (1,000) |  | (1,000) |  |  |
Contingent consideration |  |  |  |  |  | $ 1,800
ZTEC Instruments, Inc. |  |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |
Business combination, contingent consideration reduced amount |  | $ (600) | (1,600) | $ (600) |  |
Contingent consideration | $ 0 |  | $ 0 |  |  |

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