Quarterly report pursuant to Section 13 or 15(d)

Earnings Per Share - Additional information (Detail)

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Earnings Per Share - Additional information (Detail)
3 Months Ended 9 Months Ended
Sep. 29, 2012
Oct. 01, 2011
Sep. 29, 2012
Oct. 01, 2011
Stock Options
       
Earnings Per Share Disclosure [Line Items]        
Stock options excluded from computation of earnings per share 800,000 20,000 900,000 600,000
Performance-Based | Restricted Stock Units (RSUs)
       
Earnings Per Share Disclosure [Line Items]        
Stock options excluded from computation of earnings per share 400,000 300,000 400,000 300,000