Components of and Changes in Accumulated Other Comprehensive Income, Net of Related Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 26, 2015	Dec. 27, 2014	Dec. 28, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	$ (1,185)	$ (12)	$ 1,370
Other comprehensive loss	(2,303)	(1,173)	(1,382)
Ending Balance	(3,488)	(1,185)	(12)
Unrealized Holding Gains (Losses) on Available-for-Sale Securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	105	244	908
Other comprehensive loss	(199)	(139)	(664)
Ending Balance	(94)	105	244
Foreign Currency Translation
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(1,290)	(256)	462
Other comprehensive loss	(2,104)	(1,034)	(718)
Ending Balance	$ (3,394)	$ (1,290)	$ (256)