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Earnings Per Share - Schedule of Computation of Basic and Diluted Earnings Per Share for Continuing Operations (Detail) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jul. 18, 2015
Jul. 12, 2014
Jul. 18, 2015
Jul. 12, 2014
Numerator:        
Earnings from continuing operations $ 20,307 $ 17,395 $ 30,754 $ 29,914
Adjustment for earnings attributable to participating securities (350) (296) (546) (535)
Earnings from continuing operations used in calculating earnings per share $ 19,957 $ 17,099 $ 30,208 $ 29,379
Denominator:        
Weighted average shares outstanding, including participating securities 37,584 37,744 37,644 37,662
Adjustment for participating securities (648) (642) (668) (673)
Shares used in calculating basic earnings per share 36,936 37,102 36,976 36,989
Effect of dilutive stock options 126 66 126 76
Shares used in calculating diluted earnings per share 37,062 37,168 37,102 37,065
Basic earnings per share from continuing operations $ 0.54 $ 0.46 $ 0.82 $ 0.79
Diluted earnings per share from continuing operations $ 0.54 $ 0.46 $ 0.81 $ 0.79