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Net Income Per Common Share (Parenthetical) (Detail) (USD $)
 3 Months Ended
Mar. 31, 2013
Apr. 01, 2012
Mar. 31, 2009
Net Income Loss Per Common Share      
Initial debt conversion price $ 5.48    
Shares that would be issued upon conversion 34,703,196    
Convertible Notes
      
Net Income Loss Per Common Share      
Initial debt conversion price $ 5.48 $ 5.48  
Shares that would be issued upon conversion 34,700,000 34,700,000  
Convertible Notes Hedge Warrant
      
Net Income Loss Per Common Share      
Initial debt conversion price $ 7.67 $ 7.67 $ 7.67
Shares that would be issued upon conversion 34,700,000 34,700,000