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
 3 Months Ended
Apr. 30, 2014
Jan. 31, 2014
Finite Lived And Indefinite Lived Intangible Assets [Line Items]    
Total intangible assets, Gross $ 54,611 $ 54,177
Finite-lived intangible assets, Gross 54,411 53,977
Accumulated Amortization (42,682) (41,322)
Finite-lived intangible assets, Net 11,729 12,655
Total intangible assets, net 11,929 12,855
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  
Finite-lived intangible assets, Gross 32,847 32,593
Accumulated Amortization (23,249) (22,344)
Finite-lived intangible assets, Net 9,598 10,249
Non-Compete Agreements [Member]
    
Finite Lived And Indefinite Lived Intangible Assets [Line Items]    
Weighted average remaining life (years) 1 year  
Finite-lived intangible assets, Gross 2,811 2,772
Accumulated Amortization (2,707) (2,632)
Finite-lived intangible assets, Net 104 140
Completed Technology [Member]
    
Finite Lived And Indefinite Lived Intangible Assets [Line Items]    
Weighted average remaining life (years) 5 years 1 month 6 days  
Finite-lived intangible assets, Gross 11,595 11,461
Accumulated Amortization (9,568) (9,195)
Finite-lived intangible assets, Net 2,027 2,266
Trademarks, Patents and Other [Member]
    
Finite Lived And Indefinite Lived Intangible Assets [Line Items]    
Finite-lived intangible assets, Gross 7,158 7,151
Accumulated Amortization (7,158) (7,151)
Finite-lived intangible assets, Net     
Trade Names [Member]
    
Finite Lived And Indefinite Lived Intangible Assets [Line Items]    
Indefinite-lived intangible assets 200 200
Indefinite-lived intangible assets $ 200 $ 200