Organization and Significant Accounting Policies - Customers as Percentage of Total Sales (Detail) (Sales [Member], Customer concentration risk [Member])	3 Months Ended
	Mar. 28, 2014	Mar. 29, 2013
Concentration Risk [Line Items]
Total	79.00%	88.40%
Lam Research Corporation [Member]
Concentration Risk [Line Items]
Total	34.30%	28.60%
Applied Materials, Inc. [Member]
Concentration Risk [Line Items]
Total	25.30%	36.90%
ASM International [Member]
Concentration Risk [Line Items]
Total	19.40%	12.30%
Intuitive Surgical, Inc. [Member]
Concentration Risk [Line Items]
Total		10.60%