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Components of and Changes in Accumulated Other Comprehensive Income, Net of Related Income Taxes (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 27, 2015
Jun. 28, 2014
Jun. 27, 2015
Jun. 28, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance     $ (1,185)  
Other comprehensive income (loss) $ (582) $ 294 (634) $ (28)
Ending Balance (1,819)   (1,819)  
Unrealized Holding Gain on Available-for-Sale Securities        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance     105  
Other comprehensive income (loss)     64  
Ending Balance 169   169  
Foreign Currency Translation        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance     (1,290)  
Other comprehensive income (loss)     (698)  
Ending Balance $ (1,988)   $ (1,988)