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Stock-Based Compensation - Additional Information (Detail) (USD $)
3 Months Ended 9 Months Ended
Sep. 28, 2012
Sep. 30, 2011
Sep. 28, 2012
Sep. 30, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock options, expiration term     10 years  
Maximum
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Percentage of annual bonus settled with fully vested restricted stock unit awards     40.00%  
Vested Restricted Stock Awards
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock based compensation, vesting period     4 years  
Stock based compensation expense $ 1,568,000 $ 1,329,000 $ 4,701,000 $ 4,043,000
Unvested Restricted Stock Awards
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock based compensation, vesting period     4 years  
Stock based compensation expense 1,018,000 805,000 4,757,000 3,728,000
Restricted Stock Units (RSUs) | Minimum
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Recipient age to expense award on grant date     59 years 6 months  
Unvested Stock Options | Minimum
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Recipient age to expense award on grant date     59 years 6 months  
Stock Options
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock based compensation, vesting period     4 years  
Stock based compensation expense $ 162,000 $ 140,000 $ 474,000 $ 437,000
Vesting percentage of stock options granted per year     25.00%  
Expected dividend yield     0.00%