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Variable Interest Entity (VIE) - Changes in Noncontrolling Interest for Cercacor (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jul. 04, 2015
Jun. 28, 2014
Jul. 04, 2015
Jun. 28, 2014
Variable Interest Entity [Abstract]        
Noncontrolling Interest Table [Table Text Block]    
 
Six Months Ended 
 July 4, 2015
Noncontrolling interest, beginning of period
$
1,742

Increase in additional paid-in capital of noncontrolling interest
6

Net loss attributable to noncontrolling interest
1,356

     Noncontrolling interest, end of period
$
392

  
Noncontrolling interest, beginning of period     $ 1,742  
Increase in additional paid-in capital of noncontrolling interest     6  
Net loss attributable to noncontrolling interest $ 655 $ (150) 1,356 $ (9)
Noncontrolling interest, end of period $ 392   $ 392