Net Income Per Common Share - Additional Information (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended			9 Months Ended
	Sep. 28, 2014	Sep. 29, 2013	Sep. 30, 2013	Sep. 28, 2014	Sep. 29, 2013
Net Income Loss Per Common Share
Shares that would be issued upon conversion		34.7	34.7	34.7	34.7
Exercise of stock options	0.3	0.4		0.3	0.4
Convertible Notes Hedge Warrant
Net Income Loss Per Common Share
Initial debt conversion price			$ 7.67