Annual report pursuant to Section 13 and 15(d)

Investments in Marketable Securities - Reconciliation of Liabilities Measured at Fair Value on Recurring Basis (Detail)

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Investments in Marketable Securities - Reconciliation of Liabilities Measured at Fair Value on Recurring Basis (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Jan. 31, 2014
Jan. 31, 2013
Jan. 31, 2012
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Ending balance January 31, 2013 $ 5,656    
Change in fair value of contingent consideration 60 (2,435) (3,312)
Ending balance January 31, 2014   5,656  
Fair Value, Inputs, Level 3 [Member]
     
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Ending balance January 31, 2014   5,656  
Accrued Contingent Consideration [Member] | Fair Value, Inputs, Level 3 [Member]
     
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Ending balance January 31, 2013 5,656    
Change in fair value of contingent consideration (60)    
Contingency payment/Issuance of stock (5,619)    
Translation adjustment 23    
Ending balance January 31, 2014