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Restructuring and Other - Additional Information (Detail) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 USD ($) | Oct. 01, 2017 USD ($) | Jul. 02, 2017 USD ($) | Apr. 02, 2017 USD ($) | Dec. 31, 2016 USD ($) | Oct. 02, 2016 USD ($) | Apr. 03, 2016 USD ($) | Dec. 31, 2017 USD ($) Employee | Dec. 31, 2016 USD ($) Employee | Dec. 31, 2015 USD ($) Employee
Restructuring Cost and Reserve |  |  |  |  |  |  |  |  |  |
Contingent consideration adjustment |  |  |  |  |  |  |  | $ 7,820 | $ 15,896 | $ 2,489
Severance benefit and charges | $ 1,800 | $ 600 | $ 800 | $ 600 |  |  |  | $ 1,400 |  |
Lease termination period |  |  |  |  |  |  |  | 2017-09 |  |
Property, Plant and Equipment |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve |  |  |  |  |  |  |  |  |  |
Impairment of fixed assets and other expenses |  |  |  |  |  |  |  |  | 4,200 |
Wireless Test |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve |  |  |  |  |  |  |  |  |  |
Lease impairment |  |  |  |  |  |  |  | $ 1,000 |  |
Semiconductor Test | Property, Plant and Equipment |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve |  |  |  |  |  |  |  |  |  |
Impairment of fixed assets and other expenses |  |  |  |  |  |  |  | 1,100 |  |
Impairment of fixed assets and expenses related to the Japan earthquake |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve |  |  |  |  |  |  |  |  |  |
Property insurance, recovery |  | 5,100 |  |  |  |  |  | 5,100 | 5,100 |
Impairment of fixed assets and expenses related to the Japan earthquake | Earthquake Related Expenses |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve |  |  |  |  |  |  |  |  |  |
Impairment of fixed assets and other expenses |  | 800 |  |  |  |  |  | 800 | 900 |
Universal Robots |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve |  |  |  |  |  |  |  |  |  |
Contingent consideration adjustment | $ 6,000 | $ (300) | $ 1,500 | $ 600 | $ 5,400 | $ 8,000 | $ 1,200 | 7,800 | 15,300 | 5,300
Acquisition related costs |  |  |  |  |  |  |  |  |  | 1,000
Avionics Interface Technologies, LLC |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve |  |  |  |  |  |  |  |  |  |
Contingent consideration adjustment |  |  |  |  |  |  |  |  | 600 | (1,300)
ZTEC Corporation and Avionics Interface Technologies LLC |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve |  |  |  |  |  |  |  |  |  |
Contingent consideration adjustment |  |  |  |  |  |  |  |  |  | (2,900)
ZTEC Instruments, Inc. |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve |  |  |  |  |  |  |  |  |  |
Contingent consideration adjustment |  |  |  |  |  |  |  |  |  | (1,600)
Semiconductor Test and Wireless Test |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve |  |  |  |  |  |  |  |  |  |
Severance benefit and charges |  |  |  |  |  |  |  |  | $ 6,000 |
Reduction in employees headcount | Employee |  |  |  |  |  |  |  |  | 146 |
Semiconductor Test and Wireless Test | Wireless Test |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve |  |  |  |  |  |  |  |  |  |
Reduction in employees headcount | Employee |  |  |  |  |  |  |  |  | 102 |
Semiconductor Test and Wireless Test | Semiconductor Test |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve |  |  |  |  |  |  |  |  |  |
Reduction in employees headcount | Employee |  |  |  |  |  |  |  |  | 44 |
System Test and Semiconductor Test |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve |  |  |  |  |  |  |  |  |  |
Severance benefit and charges |  |  |  |  |  |  |  |  |  | $ 1,500
Reduction in employees headcount | Employee |  |  |  |  |  |  |  |  |  | 23
Semiconductor Test, Industrial Automation and Corporate |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve |  |  |  |  |  |  |  |  |  |
Severance benefit and charges |  |  |  |  |  |  |  | $ 3,800 |  |
Reduction in employees headcount | Employee |  |  |  |  |  |  |  | 91 |  |
Semiconductor Test, Industrial Automation and Corporate | Semiconductor Test |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve |  |  |  |  |  |  |  |  |  |
Reduction in employees headcount | Employee |  |  |  |  |  |  |  | 75 |  |
Semiconductor Test, Industrial Automation and Corporate | Industrial Automation |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve |  |  |  |  |  |  |  |  |  |
Reduction in employees headcount | Employee |  |  |  |  |  |  |  | 8 |  |
Semiconductor Test, Industrial Automation and Corporate | Corporate |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve |  |  |  |  |  |  |  |  |  |
Reduction in employees headcount | Employee |  |  |  |  |  |  |  | 8 |  |

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