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 6 Months Ended
Jan. 31, 2010
Jun. 28, 2014
Jun. 29, 2013
Jun. 28, 2014
Jun. 29, 2013
Dec. 28, 2013
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 $ 77 $ 138 $ 155  
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   863   863   876
Deferred compensation plan associated liabilities   717   717   838
Change in associated liabilities, Employee contribution   34 43 34 43  
Change in associated liabilities, Company contribution   8 12 8 12  
Net gain (loss) due to change in cash surrender value   $ (13) $ (6) $ (13) $ 24