Quarterly report pursuant to Section 13 or 15(d)

Employee Retirement Plan and Deferred Compensation Plan - Additional Information (Detail)

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Employee Retirement Plan and Deferred Compensation Plan - Additional Information (Detail) (USD $)
In Thousands, unless otherwise specified
1 Months Ended 3 Months Ended 9 Months Ended
Jan. 31, 2010
Sep. 28, 2013
Sep. 29, 2012
Sep. 28, 2013
Sep. 29, 2012
Dec. 29, 2012
Postemployment Benefits [Abstract]            
Minimum service period required to cover under plan       1 month    
Employee's salary subscription rate       6.00%    
Contributions vest in annual installments       3 years    
Discretionary contributions   $ 68 $ 85 $ 223 $ 256  
Defer up to under deferred compensation plan of base salary 90.00%          
Defer up to under deferred compensation plan of annual earned bonus 100.00%          
Deferred compensation plan vested 100.00%          
Eligible contributions to deferred compensation plan 50.00%          
Deferred compensation plan - company matching contribution percentage maximum (at fifty cents per dollar) 2.00%          
Deferred compensation plan assets   852   852   697
Deferred compensation plan associated liabilities   769   769   651
Employee contribution associated liabilities   614 476 614 476  
Company contribution associated liabilities   137 99 137 99  
Change in the cash surrender value   $ 24 $ 21 $ 48 $ 37