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Shareholders' Equity - Restricted Stock Awards and Restricted Stock Units - Additional Information (Detail) (USD $)
3 Months Ended 6 Months Ended
Aug. 03, 2013
Jul. 28, 2012
Aug. 03, 2013
Jul. 28, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock-based compensation expense     $ 1,716,000 $ 1,466,000
Compensation cost related to nonvested stock options, restricted stock awards and restricted stock units not yet recognized 3,200,000   3,200,000  
Stock based compensation expense, weighted average period 2 years 2 months 31 days      
Restricted Stock [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Weighted-average grant-date fair Value granted (in dollars per share)       $ 1.77
Fair value of awards vested     1,100,000 500,000
Granted, Shares     170,000  
Restricted Stock Units [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Weighted-average grant-date fair Value granted (in dollars per share)     $ 3.47 $ 1.57
Fair value of awards vested     400,000 200,000
Granted, Shares     122,480  
Performance Plan [Member] | Restricted Stock [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period of restricted stock     4 years  
Restricted stock award vesting percentage per year     25.00%  
Performance Plan [Member] | Restricted Stock Units [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Restricted stock award vesting percentage per year     100.00%  
Stock-based compensation expense $ 700,000 $ 600,000 $ 1,700,000 $ 1,500,000
Performance -based restricted stock awards [Member] | Performance Shares [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Granted, Shares       675,000
Performance -based restricted stock awards [Member] | Restricted Stock Units [Member]
       
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Weighted-average grant-date fair Value granted (in dollars per share)     $ 2.51 $ 1.76