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. 28, 2014
Jun. 29, 2013
Jun. 28, 2014
Jun. 29, 2013
Shareholders Equity [Line Items]        
Beginning of Period     $ 171,509  
Foreign Currency Translation Adjustment (182) (192) (568) (389)
Stock Compensation Expense     (866) (709)
Net Income 13,144 5,158 20,651 13,722
Change in Accumulated (Loss) Income on Derivatives - Net of Tax (28) 23 (8) 38
Retirement Liability Adjustment - Net of Tax 106 105 208 211
End of Period 194,723   194,723  
Convertible Class B Stock [Member]
        
Shareholders Equity [Line Items]        
Shares Authorized 10,000   10,000  
Share Par Value $ 0.01   $ 0.01  
Beginning of Period, Shares     4,590  
Conversion of Class B Shares to Common Shares, Shares     (618)  
Exercise of Stock Options, Shares     113  
End of Period, Shares 4,085   4,085  
Common Stock [Member]
        
Shareholders Equity [Line Items]        
Beginning of Period     179  
Conversion of Class B Shares to Common Shares     0  
Exercise of Stock Options     2  
End of Period 181   181  
Shares Authorized 40,000   40,000  
Share Par Value $ 0.01   $ 0.01  
Beginning of Period, Shares     13,268  
Conversion of Class B Shares to Common Shares, Shares     618  
Exercise of Stock Options, Shares     131  
End of Period, Shares 14,017   14,017  
Additional Paid in Capital [Member]
        
Shareholders Equity [Line Items]        
Beginning of Period     40,826  
Stock Compensation Expense     866  
Exercise of Stock Options     2,063  
End of Period 43,755   43,755  
Accumulated Comprehensive Loss [Member]
        
Shareholders Equity [Line Items]        
Beginning of Period     (3,611)  
Foreign Currency Translation Adjustment     (568)  
Change in Accumulated (Loss) Income on Derivatives - Net of Tax     (8)  
Retirement Liability Adjustment - Net of Tax     208  
End of Period (3,979)   (3,979)  
Retained Earnings [Member]
        
Shareholders Equity [Line Items]        
Beginning of Period     134,115  
Net Income     20,651  
End of Period $ 154,766   $ 154,766