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Variable Interest Entity (VIE) - Changes in Noncontrolling Interest for Cercacor (Detail) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 29, 2012
Oct. 01, 2011
Sep. 29, 2012
Oct. 01, 2011
Noncontrolling Interest [Line Items]        
Noncontrolling interest, beginning of period     $ 2,838  
Increase in additional paid-in capital of noncontrolling interest     60  
Net loss attributable to noncontrolling interest (231) (5) (168) 7
Other comprehensive income attributable to noncontrolling interest         
Noncontrolling interest, end of period $ 2,730   $ 2,730