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Income Taxes - Additional Information (Detail) (USD $)
 12 Months Ended
Jan. 31, 2014
Dec. 31, 2013
Jan. 31, 2013
Jan. 31, 2012
Income Taxes [Line Items]        
Deferred tax asset $ 5,000      
Associated excess tax benefit (5,000) 420,000 420,000 778,000
Net reduction in consolidated income tax expenses     141,000  
Recognized tax benefit     3,300,000  
Reversed estimates of potential penalties and interest     1,900,000  
Unrecognized Tax Benefit 408,000   376,000  
Accrued interest and penalties 154,000   376,000  
Potential penalties and interest     93,000 578,000
Foreign Country [Member]
        
Income Taxes [Line Items]        
Tax credit carry forwards $ 3,500,000      
Tax credit carry forwards expiration year 2024