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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. 01, 2017
Oct. 02, 2016
Oct. 01, 2017
Oct. 02, 2016
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Payments of contingent consideration     $ 1,050 $ 11,697
Increase(decrease)in contingent consideration     1,847 10,451
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 $ (300) $ 8,000 1,800 $ 9,900
Avionics Interface Technologies, LLC        
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Payments of contingent consideration     $ 1,100  
Increase(decrease)in contingent consideration       $ 600