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Cash Dividends (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 24, 2015
Mar. 25, 2015
Jun. 26, 2014
Mar. 27, 2014
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Stockholders Equity Note [Line Items]                
Cash dividends paid, per share         $ 0.10 $ 0.10 $ 0.20 $ 0.20
Cash dividends paid             $ 29,352  
Retained Earnings                
Stockholders Equity Note [Line Items]                
Cash dividends paid             $ 29,352 $ 29,018
Installment 1, FY 2014                
Stockholders Equity Note [Line Items]                
Cash dividends paid, date               Mar. 27, 2014
Cash dividends paid, per share       $ 0.10        
Installment 1, FY 2014 | Retained Earnings                
Stockholders Equity Note [Line Items]                
Cash dividends paid               $ 14,456
Installment 2, FY 2014                
Stockholders Equity Note [Line Items]                
Cash dividends paid, date               Jun. 26, 2014
Cash dividends paid, per share     $ 0.10          
Installment 2, FY 2014 | Retained Earnings                
Stockholders Equity Note [Line Items]                
Cash dividends paid               $ 14,562
Installment 1, FY 2015                
Stockholders Equity Note [Line Items]                
Cash dividends paid, date             Mar. 25, 2015  
Cash dividends paid, per share   $ 0.10            
Installment 1, FY 2015 | Retained Earnings                
Stockholders Equity Note [Line Items]                
Cash dividends paid             $ 14,640  
Installment 2, FY 2015                
Stockholders Equity Note [Line Items]                
Cash dividends paid, date             Jun. 24, 2015  
Cash dividends paid, per share $ 0.10              
Installment 2, FY 2015 | Retained Earnings                
Stockholders Equity Note [Line Items]                
Cash dividends paid             $ 14,712