Summary of Effects of Stock Based Compensation on Company's Balance Sheets (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 29, 2012	Dec. 31, 2011
Stock-based compensation effects in inventory [Member]
Effects Of Stock Based Compensation [Line Items]
Effects of stock based compensation	$ 4,333	$ 3,479
Stock-based compensation effects in deferred inventory cost [Member]
Effects Of Stock Based Compensation [Line Items]
Effects of stock based compensation	74	179
Stock-based compensation effects in fixed assets [Member]
Effects Of Stock Based Compensation [Line Items]
Effects of stock based compensation	$ 5	$ 36