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Share-based Compensation (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 26, 2012
Jun. 28, 2011
Jun. 26, 2012
Jun. 28, 2011
Share-based Compensation.        
Number of common shares that an RSU holder would receive upon satisfaction of service-based vesting requirement (in shares) 1   1  
Share-based compensation expenses        
Share-based compensation expense $ 3,271 $ 2,773 $ 6,324 $ 5,733
Labor expense
       
Share-based compensation expenses        
Share-based compensation expense 1,123 996 2,129 1,934
General and administrative expense
       
Share-based compensation expenses        
Share-based compensation expense $ 2,148 $ 1,777 $ 4,195 $ 3,799