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Stock-Based Compensation Expense - Weighted-Average Assumptions Used in Estimating Fair Values of Stock Options Granted (Detail)
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jul. 01, 2012
Jun. 30, 2013
Jul. 01, 2012
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]        
Risk-free rate 2.00% 2.00% 2.00% 2.00%
Expected dividend yield 0.00% 1.20% 0.00% 1.20%
Expected volatility 42.00% 44.00% 42.00% 44.00%
Expected term (in years) 5 years 10 months 24 days 5 years 8 months 12 days 5 years 10 months 24 days 5 years 8 months 12 days