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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 9 Months Ended
Sep. 26, 2015
Sep. 27, 2014
Sep. 26, 2015
Sep. 27, 2014
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance     $ (1,185)  
Other comprehensive income (loss) $ (924) $ (255) (1,558) $ (283)
Ending Balance (2,743)   (2,743)  
Unrealized Holding Gain on Available-for-Sale Securities        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance     105  
Other comprehensive income (loss)     70  
Ending Balance 175   175  
Foreign Currency Translation        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Beginning Balance     (1,290)  
Other comprehensive income (loss)     (1,628)  
Ending Balance $ (2,918)   $ (2,918)