Net Income (Loss) Per Share - Basic and Diluted Net Income (Loss) Per Share (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 28, 2014	Mar. 29, 2013
Numerator:
Net income (loss)	$ 7,056	$ (311)
Shares used in computation - basic:
Weighted average common shares outstanding	28,877	27,978
Shares used in computation - diluted:
Weighted average common shares outstanding	28,877	27,978
Dilutive effect of common shares outstanding subject to repurchase	664
Dilutive effect of options outstanding	377
Shares used in computing diluted net income (loss) per share	29,918	27,978
Net income (loss) per share - basic	$ 0.24	$ (0.01)
Net income (loss) per share - diluted	$ 0.24	$ (0.01)