Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation (Narrative) (Detail)

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Stock-Based Compensation (Narrative) (Detail) (USD $)
 3 Months Ended 9 Months Ended
Sep. 23, 2012
Sep. 25, 2011
Sep. 23, 2012
Sep. 25, 2011
Stock Based Compensation Activity [Line Items]        
Stock-based compensation $ 77,000 $ 88,000 $ 252,000 $ 263,000
Estimated fair value of the common stock, per share     $ 22.73  
Weighted-average grant date fair value of options granted     $ 6.07  
Immediately recognized unrecognized compensation costs     682  
2012 Omnibus Equity Incentive Plan [Member]
        
Stock Based Compensation Activity [Line Items]        
Common stock reserved for issuance 1,250,000   1,250,000  
Maximum term     10 years  
Options granted on the first anniversary of the date of grant, percentage     20.00%  
Options granted on the second anniversary of the date of grant, percentage     20.00%  
Options granted on the third anniversary of the date of grant, percentage     20.00%  
Options granted on the fourth anniversary of the date of grant, percentage     20.00%  
Options granted on the fifth anniversary of the date of grant, percentage     20.00%  
2006 Plan [Member]
        
Stock Based Compensation Activity [Line Items]        
Maximum term     10 years  
Options granted on the first anniversary of the date of grant, percentage     20.00%  
Options granted on the second anniversary of the date of grant, percentage     20.00%  
Options granted on the third anniversary of the date of grant, percentage     20.00%  
Options granted on the fourth anniversary of the date of grant, percentage     20.00%  
Options granted on the fifth anniversary of the date of grant, percentage     20.00%  
Total unrecognized compensation costs $ 877   $ 877  
2006 Plan [Member] | Pre Amended Plan [Member]
        
Stock Based Compensation Activity [Line Items]        
Common stock reserved for issuance 1,004,957   1,004,957  
2006 Plan [Member] | Amended Plan [Member]
        
Stock Based Compensation Activity [Line Items]        
Common stock reserved for issuance 1,070,209   1,070,209