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Consolidated Quarterly Statements of Operations (Parenthetical) (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Oct. 02, 2016 | Jul. 03, 2016 | Apr. 03, 2016 | Dec. 31, 2015 | Oct. 04, 2015 | Jul. 05, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |
Changes to fair value of contingent consideration |  |  |  |  |  |  |  | $ 15,896 | $ 2,489 | $ (630)
Pension and post retirement net actuarial losses (gain) | $ (2,000) | $ 700 | $ (700) | $ (1,200) | $ 17,700 |  |  |  |  |
Restructuring and other |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |
Building impairment and other expenses |  |  | 4,200 |  |  |  |  |  |  |
Changes to fair value of contingent consideration |  |  | 1,400 |  |  |  |  |  |  |
Universal Robots |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |
Changes to fair value of contingent consideration | $ 5,400 | $ 8,000 |  | $ 1,200 | 5,339 |  |  | 15,300 | 5,300 |
Universal Robots | Restructuring and other |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |
Changes to fair value of contingent consideration |  |  | 800 |  |  |  |  |  |  |
Avionics Interface Technologies, LLC |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |
Changes to fair value of contingent consideration |  |  |  |  | $ (300) | $ (1,000) |  | 600 | (1,300) |
Avionics Interface Technologies, LLC | Restructuring and other |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |
Changes to fair value of contingent consideration |  |  | 600 |  |  |  |  |  |  |
ZTEC Instruments, Inc. |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |
Changes to fair value of contingent consideration |  |  |  |  |  |  | $ (1,600) |  | $ (1,600) | $ (600)
Impairment of fixed assets and expenses related to the Japan earthquake |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |
Property insurance recovery |  |  |  |  |  |  |  | 5,400 |  |
Impairment of fixed assets and expenses related to the Japan earthquake | Restructuring and other |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |
Property insurance recovery |  |  | 5,100 |  |  |  |  |  |  |
Impairment of fixed assets and expenses related to the Japan earthquake | Earthquake Related Expenses |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |
Building impairment and other expenses |  |  |  |  |  |  |  | $ 1,200 |  |
Impairment of fixed assets and expenses related to the Japan earthquake | Earthquake Related Expenses | Restructuring and other |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |
Building impairment and other expenses |  |  | $ 900 |  |  |  |  |  |  |

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