Quarterly report pursuant to Section 13 or 15(d)

Shareholder's Equity - Summary of Changes in Shareholder's Equity (Detail)

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Shareholder's Equity - Summary of Changes in Shareholder's Equity (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 29, 2013
Jun. 30, 2012
Jun. 29, 2013
Jun. 30, 2012
Shareholders Equity [Line Items]        
Beginning of Period     $ 125,134  
Foreign Currency Translation Adjustment (192) (117) (389) (7)
Stock Compensation Expense     709 723
Net Income 5,158 5,194 13,722 11,289
Mark to Market Adjustment for Derivatives 23 27 38 50
End of Period 139,657   139,657  
Shares Authorized 40,000   40,000  
Share Par Value $ 0.01   $ 0.01  
Common Class B [Member]
        
Shareholders Equity [Line Items]        
Shares Authorized 10,000   10,000  
Share Par Value $ 0.01   $ 0.01  
Common Stock [Member]
        
Shareholders Equity [Line Items]        
Beginning of Period     145  
End of Period 145   145  
Beginning of Period, Shares     10,865  
Conversion of Class B Shares to Common Shares     349  
Exercise of Stock Options, Shares     35  
End of Period, Shares 11,249   11,249  
Common Stock [Member] | Common Class B [Member]
        
Shareholders Equity [Line Items]        
Beginning of Period, Shares     3,596  
Conversion of Class B Shares to Common Shares     (349)  
Exercise of Stock Options, Shares     18  
End of Period, Shares 3,265   3,265  
Additional Paid-in Capital [Member]
        
Shareholders Equity [Line Items]        
Beginning of Period     22,883  
Stock Compensation Expense     709  
Exercise of Stock Options     232  
End of Period 23,824   23,824  
Accumulated Other Comprehensive Income (Loss) [Member]
        
Shareholders Equity [Line Items]        
Beginning of Period     (4,783)  
Foreign Currency Translation Adjustment     (389)  
Mark to Market Adjustment for Derivatives     38  
Retirement Liability Adjustment     211  
End of Period (4,923)   (4,923)  
Retained Earnings [Member]
        
Shareholders Equity [Line Items]        
Beginning of Period     106,889  
Net Income     13,722  
End of Period $ 120,611   $ 120,611