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Share-Based Compensation - Additional Information (Detail) - USD ($)
3 Months Ended 6 Months Ended
Jul. 24, 2014
Jun. 28, 2015
Jun. 29, 2014
Jun. 28, 2015
Jun. 29, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Compensation expense   $ 500,000 $ 500,000 $ 1,000,000 $ 1,000,000
Granted shares       10,000  
Employee share option award exercised       $ 49,000 55,000
Shares withheld for tax requirements       52,621  
Tax withholding payments for share-based compensation       $ 685,000 $ 809,000
Common Stock [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Closing stock price per share   $ 14.42   $ 14.42  
Issuance of nonvested share awards, Shares       152,140 152,920
Shares withheld for tax requirements       52,621 52,927
Tax withholding payments for share-based compensation       $ 1,000 $ 1,000
Share Option Awards [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Maximum expiration period of share based payment awards granted       10 years  
Granted shares       10,000 18,000
Weighted-average grant-date fair value per share       $ 6.22 $ 4.80
Intrinsic value of share option awards exercised       $ 100,000 $ 100,000
Employee share option award exercised       49,000 55,000
Tax benefit realized for the expected tax deduction from share option award exercises       24,000 41,000
Unrecognized compensation expense   $ 300,000   $ 300,000  
Weighted-average period of recognition       2 years 2 months 12 days  
Share Option Awards [Member] | Share-based Compensation Award, Tranche One [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting rights (as percentage)       25.00%  
Nonvested Share Awards [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Weighted-average period of recognition       2 years 9 months 18 days  
Fair value of nonvested share awards       $ 1,700,000 $ 2,100,000
Issuance of nonvested share awards, Shares       152,140 152,920
Weighted-average grant-date fair value per share, granted       $ 12.65 $ 15.14
Unrecognized compensation expenses   4,100,000   $ 4,100,000  
Nonvested Share Unit Awards [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Weighted-average period of recognition       1 year 7 months 6 days  
Fair value of nonvested share awards       $ 100,000 $ 100,000
Issuance of nonvested share awards, Shares       21,000 12,000
Weighted-average grant-date fair value per share, granted       $ 14.66 $ 11.93
Unrecognized compensation expenses   $ 500,000   $ 500,000  
Performance Shares [Member] | Share-based Compensation Award, Tranche One [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting rights (as percentage)       25.00%  
Performance Shares [Member] | Non-Employee Directors [Member] | Share-based Compensation Award, Tranche One [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting rights (as percentage) 100.00%        
Vesting period 1 year