Quarterly report pursuant to Section 13 or 15(d)

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

v2.4.0.8
Shareholder's Equity - Summary of Changes in Shareholder's Equity (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 28, 2013
Sep. 29, 2012
Sep. 28, 2013
Sep. 29, 2012
Shareholders Equity [Line Items]        
Beginning of Period     $ 125,134  
Foreign Currency Translation Adjustment 129 258 (260) 251
Stock Compensation Expense     1,048 1,078
Net Income 7,155 4,930 20,877 16,219
Mark to Market Adjustment for Derivatives 27 26 65 76
End of Period 148,237   148,237  
Shares Authorized 40,000   40,000  
Share Par Value $ 0.01   $ 0.01  
Class B Common Stock [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     174  
Exercise of Stock Options     1  
End of Period 175   175  
Beginning of Period, Shares     10,865  
Conversion of Class B Shares to Common Shares     561  
Exercise of Stock Options, Shares     69  
End of Period, Shares 11,495   11,495  
Common Stock [Member] | Class B Common Stock [Member]
        
Shareholders Equity [Line Items]        
Beginning of Period, Shares     6,488  
Conversion of Class B Shares to Common Shares     (561)  
Exercise of Stock Options, Shares     58  
End of Period, Shares 5,985   5,985  
Additional Paid in Capital [Member]
        
Shareholders Equity [Line Items]        
Beginning of Period     22,854  
Stock Compensation Expense     1,048  
Exercise of Stock Options     1,056  
End of Period 24,958   24,958  
Accumulated Other Comprehensive Loss [Member]
        
Shareholders Equity [Line Items]        
Beginning of Period     (4,783)  
Foreign Currency Translation Adjustment     (260)  
Mark to Market Adjustment for Derivatives     65  
Retirement Liability Adjustment     316  
End of Period (4,662)   (4,662)  
Retained Earnings [Member]
        
Shareholders Equity [Line Items]        
Beginning of Period     106,889  
Net Income     20,877  
End of Period $ 127,766   $ 127,766