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
 6 Months Ended
Jul. 31, 2016
Jan. 31, 2016
Finite-Lived Intangible Assets [Line Items]    
Weighted average remaining life (Years) 4 years 4 months 24 days  
Finite-life intangible assets, Gross $ 53,095 $ 49,464
Accumulated Amortization (47,016) (45,338)
Finite-life intangible assets, Net $ 6,079 4,126
Customer Contracts [Member]    
Finite-Lived Intangible Assets [Line Items]    
Weighted average remaining life (Years) 4 years 1 month 6 days  
Finite-life intangible assets, Gross $ 31,672 29,956
Accumulated Amortization (27,475) (26,284)
Finite-life intangible assets, Net $ 4,197 3,672
Non-Compete Agreements [Member]    
Finite-Lived Intangible Assets [Line Items]    
Weighted average remaining life (Years) 1 year 9 months 18 days  
Finite-life intangible assets, Gross $ 2,515 2,365
Accumulated Amortization (2,429) (2,365)
Finite-life intangible assets, Net $ 86  
Completed Technology [Member]    
Finite-Lived Intangible Assets [Line Items]    
Weighted average remaining life (Years) 5 years 7 months 6 days  
Finite-life intangible assets, Gross $ 11,632 10,075
Accumulated Amortization (10,023) (9,621)
Finite-life intangible assets, Net $ 1,609 454
Trademarks, Patents and Other [Member]    
Finite-Lived Intangible Assets [Line Items]    
Weighted average remaining life (Years) 4 years 9 months 18 days  
Finite-life intangible assets, Gross $ 7,276 7,068
Accumulated Amortization (7,089) $ (7,068)
Finite-life intangible assets, Net $ 187