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Share-Based Compensation - Weighted-Average Assumptions Used to Estimate the Fair Value of Each Share Option Award (Detail)
3 Months Ended 6 Months Ended
Jun. 28, 2015
Jun. 29, 2014
Jun. 28, 2015
Jun. 29, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]        
Risk-free interest rate 1.90% 1.80% 1.90% 1.80%
Expected term 5 years 9 months 18 days 5 years 9 months 18 days 5 years 9 months 18 days 5 years 9 months 18 days
Expected volatility 57.00% 57.00% 57.00% 57.00%
Expected dividend yield 2.70% 3.30% 2.70% 3.30%