Quarterly report pursuant to Section 13 or 15(d)

Goodwill and Intangible Assets - Schedule of Intangible Assets (Detail)

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Goodwill and Intangible Assets - Schedule of Intangible Assets (Detail) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jul. 31, 2013
Jan. 31, 2013
Finite Lived And Indefinite Lived Intangible Assets [Line Items]    
Total intangible assets, Gross $ 48,266 $ 48,711
Finite-lived intangible assets, Gross 48,066 48,511
Accumulated Amortization (33,304) (31,197)
Finite-lived intangible assets, Net 14,762 17,314
Total intangible assets, net 14,962 17,514
Indefinite-lived intangible assets 200 200
Indefinite-lived intangible assets 200 200
Customer Contracts [Member]
    
Finite Lived And Indefinite Lived Intangible Assets [Line Items]    
Weighted average remaining life (years) 6 years 1 month 6 days  
Finite-lived intangible assets, Gross 32,308 32,568
Accumulated Amortization (20,260) (18,756)
Finite-lived intangible assets, Net 12,048 13,812
Non-Compete Agreements [Member]
    
Finite Lived And Indefinite Lived Intangible Assets [Line Items]    
Weighted average remaining life (years) 6 months  
Finite-lived intangible assets, Gross 2,728 2,769
Accumulated Amortization (2,422) (2,375)
Finite-lived intangible assets, Net 306 394
Completed Technology [Member]
    
Finite Lived And Indefinite Lived Intangible Assets [Line Items]    
Weighted average remaining life (years) 5 years 2 months 12 days  
Finite-lived intangible assets, Gross 11,312 11,448
Accumulated Amortization (8,967) (8,437)
Finite-lived intangible assets, Net 2,345 3,011
Trademarks and Other [Member]
    
Finite Lived And Indefinite Lived Intangible Assets [Line Items]    
Weighted average remaining life (years) 6 months  
Finite-lived intangible assets, Gross 1,718 1,726
Accumulated Amortization (1,655) (1,629)
Finite-lived intangible assets, Net 63 97
Trade Names [Member]
    
Finite Lived And Indefinite Lived Intangible Assets [Line Items]    
Indefinite-lived intangible assets 200 200
Indefinite-lived intangible assets $ 200 $ 200